Android ViewGroup系列控件的使用

一、            ViewGroup1.1         概述
定义
public abstract class ViewGroup extends View implements ViewParent, ViewManager
所在的包
import android.view.ViewGroup;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
       |      |___ AbsListView
       |      |      |___ GridView
       |      |      |___ ListView
       |      |             |___ ExpandableListView
       |      |___ AbsSpinner
       |             |___ Gallery
       |             |___ Spinner
       |___ FrameLayout
       |      |___ DatePicker
       |      |___ TimePicker
       |      |___ MediaController
       |      |___ ScrollView
       |      |___ TabHost
       |      |___ ViewAnimator
       |             |___ ViewFlipper
       |             |___ ViewSwitcher
       |                    |___ ImageSwitcher
       |                    |___ TextSwitcher
       |___ LinearLayout
       |      |___ RadioGroup
       |      |___ TabWidget
       |      |___ TableLayout
       |      |___ TableRow
       |      |___ ZoomControls
       |___ RelativeLayout
       |      |___ DialerFilter
       |      |___ TwoLineListItem
       |___ AbsoluteLayout
              |___ WebView
ViewGroup继承View，是一组view的集合，通过addView()来添加child view，removeView()、removeAllViews()等删除child view。addView()加入的view存为数组，初始化数组大小为12，超过大小时每次增加12，每一个index对应一个view，可以通过getChildAt()、indexOfChild()来获取view和index，getChildCount()获取总child数。
内部类LayoutParams来管理ViewGroup的所占区域大小。
FILL_PARENT：填充满parent的宽或高
WRAP_CONTENT：内容的实际大小加边距
offsetChildrenTopAndBottom()、setPadding()来设置边距。
1.2         部分方法
void addView(View child)
void addView(View child, int index)
void addView(View child, int width, int height)
void addView(View child, LayoutParams params)
void addView(View child, int index, LayoutParams params)
void removeView(View view)
void removeViewAt(int index)
void removeViews(int start, int count)
void removeAllViews()
void removeViewInLayout(View view)
void removeViewsInLayout(int start, int count)
void removeAllViewsInLayout()
增加删除child view
void offsetChildrenTopAndBottom(int offset)
设置垂直方向顶部和底部的偏移，单位象素
int getChildCount()
int indexOfChild(View child)
View getChildAt(int index)
void setDescendantFocusability(int focusability)
int getDescendantFocusability()
ViewGroup.FOCUS_BEFORE_DESCENDANTS
先于子孙获得focus
ViewGroup.FOCUS_AFTER_DESCENDANTS
子孙都不需要focus时viewgroup才获得
ViewGroup.FOCUS_BLOCK_DESCENDANTS
void setClipChildren(boolean clipChildren)
void setClipToPadding(boolean clipToPadding)
true：滚动时child不可以绘制到padding区域，即剪裁掉
false：滚动时child可以绘制到padding区域
void setOnHierarchyChangeListener(OnHierarchyChangeListener listener)
设置child有add或remove时触发的监听器
void startLayoutAnimation()
运行动画
void scheduleLayoutAnimation()
设置动画状态，刷新时运行动画
void setLayoutAnimation(LayoutAnimationController controller)
LayoutAnimationController getLayoutAnimation()
设置布局动画，在child第一次布局时运行动画
void setLayoutAnimationListener(Animation.AnimationListener animationListener)
Animation.AnimationListener getLayoutAnimationListener()
设置动画播放开始、结束、重播时触发的监听器
boolean isAnimationCacheEnabled()
void setAnimationCacheEnabled(boolean enabled)
boolean isAlwaysDrawnWithCacheEnabled()
void setAlwaysDrawnWithCacheEnabled(boolean always)
int getPersistentDrawingCache()
void setPersistentDrawingCache(int drawingCacheToKeep)
1.3         ViewGroup.LayoutParams
public static class LayoutParams
ViewGroup.LayoutParams
|___ ViewGroup.MarginLayoutParams
|      |___ FrameLayout.LayoutParams
|      |___ LinearLayout.LayoutParams
|      |      |___ RadioGroup.LayoutParams
|      |      |___ TableLayout.LayoutParams
|      |      |___ TableRow.LayoutParams
|      |___ RelativeLayout.LayoutParams
|___ AbsoluteLayout.LayoutParams
|___ AbsListView.LayoutParams
|___ Gallery.LayoutParams
|___ WindowManager.LayoutParams
public int width;     //指定view的宽高
public int height;
public LayoutAnimationController.AnimationParameters layoutAnimationParameters;
ViewGroup.LayoutParams.FILL_PARENT
ViewGroup.LayoutParams.WRAP_CONTENT
public LayoutParams(Context c, AttributeSet attrs)
public LayoutParams(int width, int height)
public LayoutParams(LayoutParams source)
LayoutParams()
1.4         ViewGroup. MarginLayoutParams
public static class MarginLayoutParams extends ViewGroup.LayoutParams
public int leftMargin;     //在ViewGroup.LayoutParams基础上增加4个方向边距
public int topMargin;
public int rightMargin;
public int bottomMargin;
public MarginLayoutParams(Context c, AttributeSet attrs)
public MarginLayoutParams(int width, int height)
public MarginLayoutParams(MarginLayoutParams source)
public MarginLayoutParams(LayoutParams source)
public void setMargins(int left, int top, int right, int bottom)
        Margin        Padding、大小为设置的width, height，背景绘制的区域        实体大小

通过ViewGroup.LayoutParams设置width，height
View.setLayoutParams(ViewGroup.LayoutParams params);
通过ViewGroup.MarginLayoutParams设置margin
ViewGroup.MarginLayoutParams.setMargins(int left, int top, int right, int bottom);
ViewGroup.MarginLayoutParams.leftMargin
通过View. setPadding(int left, int top, int right, int bottom); 设置padding
白色区域大小：    width+ leftMargin+ rightMargin
                            height+ topMargin+ bottomMargin
橙色区域大小：    width
                            height
绿色区域大小：    width- leftPadding- rightPadding
                            height- topPadding- bottomPadding

二、            AdapterView<T extends Adapter>2.1         概述
定义
public abstract class AdapterView<T extends Adapter> extends ViewGroup
包路径
import android.widget.AdapterView;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsListView
              |      |___ GridView
              |      |___ ListView
              |             |___ ExpandableListView
              |___ AbsSpinner
                     |___ Gallery
                     |___ Spinner
AdapterView继承ViewGroup，但AdapterView的child view由Adapter决定，不能通过addView()来添加。
setAdapter()来设置Adapter，getAdapter()获取。
2.2         部分方法
void addView(View child)
void addView(View child, int index)
void addView(View child, LayoutParams params)
void addView(View child, int index, LayoutParams params)
void removeView(View child)
void removeViewAt(int index)
void removeAllViews()
不支持添加删除view，使用则抛出UnsupportedOperationException异常
void setOnClickListener(OnClickListener l)
不支持，抛出异常RuntimeException
abstract T getAdapter()
abstract void setAdapter(T adapter)
设置child的数据和view
int getCount()
int getPositionForView(View view)
long getItemIdAtPosition(int position)
Object getItemAtPosition(int position)
返回Object不一定就是一个item的view，跟getAdapter().getItem(position)等效
要想获得view应getAdapter().getView(position, convertView, parent)
abstract View getSelectedView()
int getSelectedItemPosition()
long getSelectedItemId()
Object getSelectedItem()
abstract void setSelection(int position)
int getFirstVisiblePosition()
屏幕上可见的第一项的position，部分可见也算
int getLastVisiblePosition()
屏幕上可见的最后一项的position，部分可见也算
void setFocusable(boolean focusable)
void setFocusableInTouchMode(boolean focusable)
void setOnItemClickListener(OnItemClickListener listener)
final OnItemClickListener getOnItemClickListener()
设置item点击监听器
boolean performItemClick(View view, int position, long id)
调用item点击监听器设置的回调函数
void setOnItemLongClickListener(OnItemLongClickListener listener)
final OnItemLongClickListener getOnItemLongClickListener()
设置item长按监听器
void setOnItemSelectedListener(OnItemSelectedListener listener)
final OnItemSelectedListener getOnItemSelectedListener()
设置item被选择时触发的监听器
public void setTextFilterEnabled(boolean textFilterEnabled)
public boolean isTextFilterEnabled()
开启或关闭过滤窗口，开启时，键盘输入显示在屏幕下方一半透明黑色区域，根据输入过滤掉不包含输入文字的项

二、            Adapter3.1         概述
定义
public interface Adapter
包路径
import android.widget.Adapter;
SpinnerAdapter
ListAdapter
HeaderViewListAdapter
BaseAdapter
WrapperListAdapter
CursorAdapter
ArrayAdapter<T>
SimpleAdapter
Adapter
ResourceCursorAdapter
SimpleCursorAdapter
黑色文字为接口红色文字为类斜体字为抽象类
子类信息
Adapter是AdapterView和数据间的桥梁，提供访问每项数据的接口，并为每项创建一个view。
3.2         部分方法
void unregisterDataSetObserver(DataSetObserver observer);
void registerDataSetObserver(DataSetObserver observer)
注册一个observer，当该Adapter对象的数据变化时调用。
int getCount()
Object getItem(int position)
long getItemId(int position)     
boolean hasStableIds()
item的id是否稳定。稳定则数据变化时item 的id不变
View getView(int position, View convertView, ViewGroup parent)
返回显示position项数据的view，可以手动创建一个view也可以通过xml layout文件创建。
position          第position项
convertView   可以为null，送入一个view，如果这个view不能转换为需要显示的view则创建一个新的view
parent            返回的view加入parent的ViewGroup
int getViewTypeCount()
getView()返回view的种数，如果都返回同一类的view则getViewTypeCount()为1
int getItemViewType(int position)
获得position项view的类型，可以的返回值有0到getViewTypeCount() – 1和IGNORE_ITEM_VIEW_TYPE
boolean isEmpty()
是否包含有数据
ListAdapter增加
boolean isEnabled(int position)
public boolean areAllItemsEnabled()
返回false表示item不可选，不可点击
SpinnerAdapter增加
public View getDropDownView(int position, View convertView, ViewGroup parent)
position项下拉菜单的view
3.3         ArrayAdapter
class ArrayAdapter<T> extends BaseAdapter implements Filterable
ArrayAdapter(Context context, int textViewResourceId)
ArrayAdapter(Context context, int textViewResourceId, T[] objects)
ArrayAdapter(Context context, int textViewResourceId, List<T> objects)
ArrayAdapter(Context context, int resource, int textViewResourceId)
ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects)
ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects)
context
textViewResourceId
没有resource参数时：含有TextView 的layout文件资源ID，创建view时使用；
有resource参数时：layout文件中TextView的ID
resource
loyout文件资源ID
objects
ListView显示的对象
SDK自带的textViewResourceId对应的xml文件在cupcake\frameworks\base\core\res\res\layout
android.R.layout.simple_list_item_1
TextView
android.R.layout.simple_list_item_2
含有两个TextView的TwoLineListItem
android.R.layout. simple_expandable_list_item_1
TextView
android.R.layout. simple_expandable_list_item_2
含有两个TextView的TwoLineListItem
android.R.layout. simple_list_item_single_choice
CheckedTextView
android.R.layout. simple_list_item_multiple_choice
CheckedTextView
android.R.layout. simple_list_item_checked
CheckedTextView
void add(T object)
void insert(T object, int index)
void remove(T object)
void clear()
void notifyDataSetChanged()
void setNotifyOnChange(boolean notifyOnChange)
列表发生改变时是否自动调用notifyDataSetChanged()，设为false则需手动调用
Context getContext()
void setDropDownViewResource(int resource)
设置创建下拉菜单view需要的layout资源文件
static ArrayAdapter<CharSequence> createFromResource(Context context,
            int textArrayResId, int textViewResId)
Filter getFilter()
3.4         SimpleAdapter
public class SimpleAdapter extends BaseAdapter implements Filterable
public SimpleAdapter(Context context, List<? extends Map<String, ?>> data,
            int resource, String[] from, int[] to)
context
data
resource
Layout文件id
from
data中Map的key
to
生成itemView的id, to[]数组大小不能超过from []的大小
public void setDropDownViewResource(int resource)
设置创建下拉菜单view需要的layout资源文件
public ViewBinder getViewBinder()
public void setViewBinder(ViewBinder viewBinder)
public static interface ViewBinder {
boolean setViewValue(View view, Object data, String textRepresentation);
}
绑定数据到view
用setViewBinder(null)的方式取消绑定
public void setViewImage(ImageView v, int value)
public void setViewImage(ImageView v, String value)
public void setViewText(TextView v, String text)
public Filter getFilter()
3.5         SimpleCursorAdapter
public class SimpleCursorAdapter extends ResourceCursorAdapter
demo
aipDemos/com.example.android.view/List2.java
List2.java，List3.java，List7.java
菜单路径：API Demos/Views/Lists/
public SimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to)
context
layout
c
Curor
from
to
public View newView(Context context, Cursor cursor, ViewGroup parent)
public View newDropDownView(Context context, Cursor cursor, ViewGroup parent)
public ViewBinder getViewBinder()
public void setViewBinder(ViewBinder viewBinder)
public void setViewImage(ImageView v, String value)
public void setViewText(TextView v, String text)
public void bindView(View view, Context context, Cursor cursor)
public int getStringConversionColumn()
public void setStringConversionColumn(int stringConversionColumn)
设置获取from[stringConversionColumn]中数据
public CursorToStringConverter getCursorToStringConverter()
public void setCursorToStringConverter(
CursorToStringConverter cursorToStringConverter)
public static interface CursorToStringConverter {
CharSequence convertToString(Cursor cursor);
}
public CharSequence convertToString(Cursor cursor)
获取from[stringConversionColumn]中数据
public void changeCursor(Cursor c)
3.6         HeaderViewListAdapter
public class HeaderViewListAdapter implements WrapperListAdapter, Filterable
private ListAdapter mAdapter;
ArrayList<ListView.FixedViewInfo> mHeaderViewInfos;
ArrayList<ListView.FixedViewInfo> mFooterViewInfos;
public HeaderViewListAdapter(ArrayList<ListView.FixedViewInfo> headerViewInfos,
ArrayList<ListView.FixedViewInfo> footerViewInfos,
ListAdapter adapter)
headerViewInfos
footerViewInfos
adapter
public class FixedViewInfo {
public View view;
public Object data;
public boolean isSelectable;
}
public int getHeadersCount()
public int getFootersCount()
public int getCount()
Header，Footer，mAdapter总item数
public boolean isEmpty()
mAdapter是否为空
public boolean removeHeader(View v)
public boolean removeFooter(View v)
public boolean areAllItemsEnabled()
public ListAdapter getWrappedAdapter()
获取mAdapter

四、            AbsListView4.1         概述
定义
public abstract class AbsListView extends AdapterView<ListAdapter> implements TextWatcher,
        ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener,
        ViewTreeObserver.OnTouchModeChangeListener
包路径
import android.widget.AbsListView;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsListView
                     |___ GridView
                     |___ ListView
                            |___ ExpandableListView
4.2         部分方法
void setStackFromBottom(boolean stackFromBottom)
boolean isStackFromBottom()
单列
多列
Disable
Enable
Disable
Enable
1
1
2
3
2
1
4
5
1
2
2
3
4
5
void setScrollingCacheEnabled(boolean enabled)
boolean isScrollingCacheEnabled()
设置是否缓存卷动项，缓存则需额外的内存，缺省为enable
void setCacheColorHint(int color)
int getCacheColorHint()
int getSolidColor()
缓存项背景颜色
int pointToPosition(int x, int y)
返回包含坐标(x, y)的项，没有项包含该点则返回INVALID_POSITION
long pointToRowId(int x, int y)
void setTranscriptMode(int mode)
int getTranscriptMode()
TRANSCRIPT_MODE_DISABLED
当数据发生变化不自动滚动
TRANSCRIPT_MODE_NORMAL
当数据发生变化时，最后一项正显示在屏幕上，自动滚动到最低端
TRANSCRIPT_MODE_ALWAYS_SCROLL
当数据发生变化时，自动滚动到最低端
void setFilterText(String filterText)
void clearTextFilter()
boolean hasTextFilter()
过滤文本
void getFocusedRect(Rect r)
获取焦点框区域
View getSelectedView()
void setSelector(int resID)
void setSelector(Drawable sel)
Drawable getSelector()
焦点框
void setDrawSelectorOnTop(boolean onTop)
true：Selector绘制在文字之上
void setScrollIndicators(View up, View down)
void reclaimViews(List<View> views)
void setRecyclerListener(RecyclerListener listener)
LayoutParams generateLayoutParams(AttributeSet attrs)
void beforeTextChanged(CharSequence s, int start, int count, int after)
void onTextChanged(CharSequence s, int start, int before, int count)
void afterTextChanged(Editable s)

五、            ListView5.1         概述
定义
public class ListView extends AbsListView
包路径
import android.widget.ListView
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsListView
                     |___ ListView
                            |___ ExpandableListView
ListView显示为垂直可滚动的一列，所有item由ListAdapter提供。
5.2         部分方法
public ListView(Context context)
public ListView(Context context, AttributeSet attrs)
public ListView(Context context, AttributeSet attrs, int defStyle)
ListAdapter getAdapter()
void setAdapter(ListAdapter adapter)
设置listitem，adapter包含每一个item的数据并提供显示数据的view
void addHeaderView(View v, Object data, boolean isSelectable)
void addHeaderView(View v)
在list顶端加headView，可以加多个，按添加的顺序显示。isSelectable为可否被选择。
必须在setAdapter()前调用，否则抛出IllegalStateException异常
int getHeaderViewsCount()
获得headerView的数量
boolean removeHeaderView(View v)
必须在setAdapter()后调用，否则抛出NullPointerException异常（运行期异常）。
void addFooterView(View v, Object data, boolean isSelectable)
void addFooterView(View v)
在list尾添加footerView，同addHeaderView()
必须在setAdapter()前后调用都可以
int getFooterViewsCount()
获得footerView的数量
boolean removeFooterView(View v)
必须在setAdapter()后调用，否则抛出NullPointerException异常（运行期异常）。
int getChoiceMode()
void setChoiceMode(int choiceMode)
ListView. CHOICE_MODE_NONE
ListView. CHOICE_MODE_SINGLE
ListView. CHOICE_MODE_MULTIPLE
void setSelection(int position)
设置第position为选择状态
void setSelectionFromTop(int position, int y)
设置第position为选择状态，使position那项的位置在距离ListView顶端y的位置
void setSelectionAfterHeaderView()
使选择项位置紧挨着HeaderView。
void setItemsCanFocus(boolean itemsCanFocus)
boolean getItemsCanFocus()
Drawable getDivider()
void setDivider(Drawable divider)
设置每两个item间的分割
int getDividerHeight()
void setDividerHeight(int height)
设置每两个item间空隙的高度
boolean isItemChecked(int position)
在单选或多选状态下判断第position项状态
int getCheckedItemPosition()
在单选状态下获取选择的那项，多选无效
SparseBooleanArray getCheckedItemPositions()
非单选模式下有效
void clearChoices()
清除选择
void setItemChecked(int position, boolean value)
设置position项的状态
Parcelable onSaveInstanceState()
void onRestoreInstanceState(Parcelable state)
boolean performItemClick(View view, int position, long id)
boolean onTouchEvent(MotionEvent ev)
boolean dispatchKeyEvent(KeyEvent event)
boolean onKeyDown(int keyCode, KeyEvent event)
boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
onKeyUp(int keyCode, KeyEvent event)

六、            ExpandableListView6.1         概述
定义
public class ExpandableListView extends ListView
包路径
import android.widget.ExpandableListView;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsListView
                     |___ ListView
                            |___ ExpandableListView
ExpandableListView显示为垂直可滚动的一列，与ListView的区别是它的item分group和child两层，item的children可以展开显示，也可以叠起不显示。所有item由ExpandableListAdapter提供。
ExpandableListItem的展开与否可以用setChildIndicator()或setGroupIndicator()来设置。
注意：如果ExpandableListView的parent高度设为WRAP_CONTENT，则不能指定ExpandableListView的layout_height为WRAP_CONTENT；如果parent高度一定则可以设为WRAP_CONTENT。
6.2         部分方法
void setAdapter(ListAdapter adapter)
抛出异常RuntimeException
ListAdapter getAdapter()
只获取groupList
void setAdapter(ExpandableListAdapter adapter)
ExpandableListAdapter getExpandableListAdapter()
设置ExpandableListView数据
boolean collapseGroup(int groupPos)
合上groupPosition组，
boolean expandGroup(int groupPos)
展开groupPosition组，是展开状态返回true
boolean isGroupExpanded(int groupPosition)
long getExpandableListPosition(int flatListPosition)
转换一个ListView的position(flatListPosition)为ExpandableList的packedPosition，packedPosition由ExpandableList的groupPosition和childPosition计算而来。
int getFlatListPosition(long packedPosition)
packedPosition转换为flatListPosition，
packedPosition类型为group时packedPosition跟groupPosition相等
packedPosition类型为child时packedPosition跟child所在的group的groupPosition相等
static int getPackedPositionType(long packedPosition)
packedPosition的类型，groupPosition还是childPosition
ExpandableListView.PACKED_POSITION_TYPE_GROUP
ExpandableListView.PACKED_POSITION_TYPE_CHILD
ExpandableListView.PACKED_POSITION_TYPE_NULL
static int getPackedPositionGroup(long packedPosition)
返回groupPosition
static int getPackedPositionChild(long packedPosition)
如果packedPosition的类型是PACKED_POSITION_TYPE_CHILD，返回childPosition
static long getPackedPositionForChild(int groupPosition, int childPosition)
生成child的packedPosition
static long getPackedPositionForGroup(int groupPosition)
生成group的packedPosition
long getSelectedPosition()
long getSelectedId()
void setGroupIndicator(Drawable groupIndicator)
groupItem的标识
void setIndicatorBounds(int left, int right)
groupItem标识的位置
void setChildIndicator(Drawable childIndicator)
childItem的标识
void setChildIndicatorBounds(int left, int right)
childItem标识的位置，从left开始到right结束，right>left才显示出来
left，right都可以指定ExpandableListView.CHILD_INDICATOR_INHERIT，继承groupItem表识的位置，即通过setIndicatorBounds()设置的位置
void setChildDivider(Drawable childDivider)
void setSelectedGroup(int groupPosition)
boolean setSelectedChild(int groupPosition, int childPosition, boolean shouldExpandGroup)
public void setOnChildClickListener(OnChildClickListener onChildClickListener)
设置childItem点击监听器
public void setOnGroupClickListener(OnGroupClickListener onGroupClickListener)
设置groupItem点击监听器
public void setOnGroupCollapseListener (
OnGroupCollapseListener onGroupCollapseListener)
设置groupItem合上时触发的监听器
public void setOnGroupExpandListener (
                   OnGroupExpandListener onGroupExpandListener)
设置groupItem展开时触发的监听器
public void setOnItemClickListener(OnItemClickListener l)
触发ItemClick的itemPos是flatListPosition，尽量用setOnChildClickListener()和setOnGroupClickListener()代替这个方法。
6.3         ExpandableListAdapter
BaseExpandableListAdapter
CursorTreeAdapter
SimpleExpandableListAdapter
ResourceCursorTreeAdapter
ExpandableListAdapter
SimpleCursorTreeAdapter
黑色文字为接口红色文字为类斜体字为抽象类

6.4         SimpleExpandableListAdapter
public class SimpleExpandableListAdapter extends BaseExpandableListAdapter
public SimpleExpandableListAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int groupLayout,
            String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo)
public SimpleExpandableListAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo)
public SimpleExpandableListAdapter(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, int lastChildLayout, String[] childFrom,
            int[] childTo)
groupData
grouplist数据
groupLayout
grouplist loyout资源文件
expandedGroupLayout
grouplist
collapsedGroupLayout
grouplist
groupFrom
抽取groupData的Map的哪几列数据
groupTo
由groupFrom获取的数据生成view的viewId
childData
childlist数据
childLayout
childlistloyout资源文件
lastChildLayout
childFrom
抽取childlist的Map的哪几列数据
childTo
由childFrom获取的数据生成view的viewId
public int getChildrenCount(int groupPosition)
public Object getChild(int groupPosition, int childPosition)
public long getChildId(int groupPosition, int childPosition)
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
            View convertView, ViewGroup parent)
public View newChildView(boolean isLastChild, ViewGroup parent)
public int getGroupCount()
public Object getGroup(int groupPosition)
public long getGroupId(int groupPosition)
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
            ViewGroup parent)
public View newGroupView(boolean isExpanded, ViewGroup parent)
public boolean isChildSelectable(int groupPosition, int childPosition)
public boolean hasStableIds()
6.5         SimpleCursorTreeAdapter
public abstract class SimpleCursorTreeAdapter extends ResourceCursorTreeAdapter
public SimpleCursorTreeAdapter(Context context, Cursor cursor, int collapsedGroupLayout,
            int expandedGroupLayout, String[] groupFrom, int[] groupTo, int childLayout,
            int lastChildLayout, String[] childFrom, int[] childTo)
public SimpleCursorTreeAdapter(Context context, Cursor cursor, int collapsedGroupLayout,
            int expandedGroupLayout, String[] groupFrom, int[] groupTo,
            int childLayout, String[] childFrom, int[] childTo)
public SimpleCursorTreeAdapter(Context context, Cursor cursor, int groupLayout,
            String[] groupFrom, int[] groupTo, int childLayout, String[] childFrom,
            int[] childTo)
与SimpleExpandableListAdapter不同的是List<? extends Map<String, ?>> groupData改为Cursor cursor，共有方法都类似。

七、            ListActivity7.1         概述
定义
public class ListActivity extends Activity
包路径
import android.app.ListActivity
子类信息
Context
|___ ContextWrapper
       |___ ContextThemeWrapper
              |___ Activity
                     |___ ListActivity
继承Activity，封装一个ListView成员
demo
aipDemos/com.example.android.view/List1.java
List1.java ~ List14.java
菜单路径：API Demos/Views/Lists/
7.2         部分方法
public void onContentChanged()
public void setListAdapter(ListAdapter adapter)
public ListAdapter getListAdapter()
public void setSelection(int position)
public int getSelectedItemPosition()
public long getSelectedItemId()
public ListView getListView()
获取ListView对象，可以使用ListView的方法
7.3         ExpandableListActivity
public class ExpandableListActivity extends Activity implements
        OnCreateContextMenuListener,
ExpandableListView.OnChildClickListener, ExpandableListView.OnGroupCollapseListener,
        ExpandableListView.OnGroupExpandListener
继承Activity封装一个ExpandableListView对象

八、            GridView8.1         概述
定义
public class GridView extends AbsListView
包路径
import android.widget.AbsListView
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsListView
                     |___ GridView
多行多列可垂直方向滚动，只支持先行后列垂直方向滚动的模式；不支持先列后行水平方向滚动的模式
支持
不支持
1  2  3
4  5  6
7
1  4  7
2  5
3  6
demo
aipDemos/com.example.android.view/Grid1.java
Grid1.java ~ Grid2.java
菜单路径：API Demos/Views/Grid/
8.2         部分方法
top padding
bottom padding
left padding
right padding
vertical spacing
horizontal spacing

void setVerticalSpacing(int verticalSpacing);
设置垂直方向行间距
void setHorizontalSpacing(int horizontalSpacing);
设置水平方向列间距
void setColumnWidth(int columnWidth);
设置列宽
void setNumColumns(int numColumns);
设置列数
void setGravity(int gravity);
设置item对齐方式
Gravity.TOP
Gravity.BOTTOM
Gravity.LEFT
缺省
Gravity.RIGHT
Gravity.CENTER_VERTICAL
Gravity.CENTER_HORIZONTAL
Gravity.CENTER
Gravity.FILL_VERTICAL
Gravity.FILL_HORIZONTAL
Gravity.FILL
Gravity.CLIP_VERTICAL
Gravity.CLIP_HORIZONTAL
int getStretchMode()
void setStretchMode(int stretchMode)
设置填充GridView时的方式
GridView.NO_STRETCH
使用设置的列宽和列间距排版，无视GridView的宽度
GridView.STRETCH_SPACING
拉伸列间距，根据列宽、列数和GridView的宽度计算列间距。Item+Space+Item
GridView.STRETCH_SPACING_UNIFORM
拉伸列间距，计算方式与
GridView.STRETCH_SPACING不同。
Space+Item+Space+Item+Space
GridView.STRETCH_COLUMN_WIDTH
拉伸列宽，根据列间距、列数和GridView的宽度计算列宽。
ListAdapter getAdapter()
void setAdapter(ListAdapter adapter)
设置item列表
public void setSelection(int position)

九、            AbsSpinner9.1         概述
定义
public abstract class AbsSpinner extends AdapterView<SpinnerAdapter>
包路径
import android.widget.AbsSpinner;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsSpinner
                     |___ Gallery
                     |___ Spinner
9.2         部分方法
void setAdapter(SpinnerAdapter adapter)
SpinnerAdapter getAdapter()
void setSelection(int position, boolean animate)
void setSelection(int position)
int getCount()
int pointToPosition(int x, int y)
Parcelable onSaveInstanceState()
void onRestoreInstanceState(Parcelable state)

十、            Gallery10.1     概述
定义
public class Gallery extends AbsSpinner implements GestureDetector.OnGestureListener
包路径
import android.widget.Gallery;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsSpinner
                     |___ Gallery
items水平方向滚动显示，滚动停止时选择项停在屏幕正中。
demo
aipDemos/com.example.android.view/Gallery1.java
Gallery1.java ~ Gallery2.java
菜单路径：API Demos/Views/Gallery/
10.2     部分方法
void setCallbackDuringFling(boolean shouldCallback)
滑动过程中是否每项都调用getOnItemSelectedListener()注册的callback
false：最后选中的一项才调用callback
true：所有项都调用callback
void setAnimationDuration(int animationDurationMillis)
设置反弹回屏幕正中这部分的动画时间间隔，单位毫秒，缺省为400ms。
void setSpacing(int spacing)
设置两项之间的间距，缺省为0，单位象素
void setUnselectedAlpha(float unselectedAlpha)
设置未选中项的alpha值 0~1.0

十一、           Spinner11.1     概述
定义
public class Spinner extends AbsSpinner implements OnClickListener
包路径
import android.widget.Spinner;
子类信息
View
|___ ViewGroup
       |___ AdapterView<T extends Adapter>
              |___ AbsSpinner
                     |___ Spinner
在一个单行文本框中，同时只显示一个有序列表中的一个项，点击弹出一个下拉单选对话框，从中进行选择。
系统自带布局文件：
simple_spinner_dropdown_item.xml
simple_spinner_item.xml
demo
aipDemos/com.example.android.view/Spinner1.java
菜单路径：API Demos/Views/Spinner/
11.2     部分方法
public int getBaseline()
public void setOnItemClickListener(OnItemClickListener l)
抛出异常RuntimeException
public boolean performClick()
弹出下拉对话框
public void onClick(DialogInterface dialog, int which)
public void setPrompt(CharSequence prompt)
public void setPromptId(int promptId)
public CharSequence getPrompt()
设置下拉菜单标题

十二、           LinearLayout12.1     概述
定义
public class LinearLayout extends ViewGroup
包路径
import android.widget.LinearLayout;
子类信息
View
|___ ViewGroup
       |___ LinearLayout
              |___ RadioGroup
              |___ TabWidget
              |___ TableLayout
              |___ TableRow
              |___ ZoomControls
              |___ NumberPicker
LinearLayout可以设置位水平的一行或垂直的一列，所有子元素按加入顺序排列，通过setOrientation()来设置行模式还是列模式，缺省为行模式。通过setGravity()设置对齐方式。
也可以对单个子元素制定weight，允许子元素填充屏幕上的剩余空间，剩余空间安指定的比例分配。
demo
aipDemos/com.example.android.view/linear_layout_1.java
linear_layout_1.java ~ linear_layout_10.java
菜单路径：API Demos/Views/ Layouts/LinearLayout/
12.2     部分方法
public LinearLayout(Context context)
public LinearLayout(Context context, AttributeSet attrs)
public boolean isBaselineAligned()
public void setBaselineAligned(boolean baselineAligned)
public int getBaseline()
获取baseline距离顶端的距离，不支持baseline对齐返回-1
public int getBaselineAlignedChildIndex()
public void setBaselineAlignedChildIndex(int i)
public float getWeightSum()
public void setWeightSum(float weightSum)
public void setOrientation(int orientation)
public int getOrientation()
HORIZONTAL：行模式
VERTICAL：列模式
public void setGravity(int gravity)
public void setHorizontalGravity(int horizontalGravity)
public void setVerticalGravity(int verticalGravity)
对齐方式
public LayoutParams generateLayoutParams(AttributeSet attrs)
public static class LayoutParams extends ViewGroup.MarginLayoutParams
增加了一个参数weight
public LayoutParams(int width, int height, float weight)
比如3个layout排成一行，分别为ly1， ly2， ly3
width值分别为width1，width2，width3
FILL_PARENT的宽度为WIDTH
weight值分别为weight1， weight2， weight3
只要weight1，weight2，weight3不同时为0，则3个layout总宽度变为WIDTH
ly1的宽度为
对weight未负数，width1+width2+width3 >= WIDTH未做测试
12.3     LinearLayout.LayoutParams
public static class LayoutParams extends ViewGroup.MarginLayoutParams
public float weight;              //增加weight属性
public int gravity = -1;
public LayoutParams(int width, int height, float weight)
12.4     RadioGroup
demo
aipDemos/com.example.android.view/RadioGroup1.java
菜单路径：API Demos/Views/ Radio Group/
一列RadioButton
public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener)
子项有变化时触发的监听器，增加/删除项
public void check(int id)
设置id项为选择
public int getCheckedRadioButtonId()
获取选择项的id
public void clearCheck()
清除选择状态
public void setOnCheckedChangeListener(OnCheckedChangeListener listener)
RadioButton状态改变监听器
12.5     TabWidget
通常用作TabHost的子元素，单独使用同LinearLayout。
12.6     TableRow
通常用作TableLayout子元素，单独使用同LinearLayout。
12.7     ZoomControls
系统带布局文件
zoom_controls.xml
public void setOnZoomInClickListener(OnClickListener listener)
public void setOnZoomOutClickListener(OnClickListener listener)
public void setZoomSpeed(long speed)
public boolean onTouchEvent(MotionEvent event)
public void show()
淡入
public void hide()
淡出消失
public void setIsZoomInEnabled(boolean isEnabled)
public void setIsZoomOutEnabled(boolean isEnabled)
public boolean hasFocus()

十三、           TableLayout13.1     概述
定义
public class TableLayout extends LinearLayout
包路径
import android.widget.TableLayout;
子类信息
View
|___ ViewGroup
       |___ LinearLayout
              |___ TableLayout
TableLayout将子元素的位置分配到行或列中，一个TableLayout由许多TableRow组成，每个TableRow都定义一个row，TableLayout不显示row、column或cell的边框线，每个row拥有0个或多个cell，每个cell拥有一个view对象。列可以被隐藏setColumnCollapsed()，也可以设置为伸展从而填充可利用的屏幕空间setColumnStretchable()，也可以设置为强制收缩直到表各匹配屏幕大小setColumnShrikable()。
TableLayout宽始终为FILL_PARENT，TableRow的高始终未WRAP_CONTEN。
demo
aipDemos/com.example.android.view/TableLayout1.java
TableLayout1.java ~ TableLayout12.java
菜单路径：API Demos/Views/ Layouts/TableLayout
13.2     部分方法
public boolean isShrinkAllColumns()
public void setShrinkAllColumns(boolean shrinkAllColumns)
是否所有列可收缩
public boolean isStretchAllColumns()
public void setStretchAllColumns(boolean stretchAllColumns)
是否所有列可拉伸
public void setColumnCollapsed(int columnIndex, boolean isCollapsed)
public boolean isColumnCollapsed(int columnIndex)
columnIndex列是否隐藏，必须是TableRow的列才能隐藏
public void setColumnStretchable(int columnIndex, boolean isStretchable)
public boolean isColumnStretchable(int columnIndex)
columnIndex列是否可拉伸
public void setColumnShrinkable(int columnIndex, boolean isShrinkable)
public boolean isColumnShrinkable(int columnIndex)
columnIndex列是否可收缩
13.3     TableLayout.LayoutParams
public static class LayoutParams extends LinearLayout.LayoutParams
重载了构造函数强制设width为FILL_PARENT
13.4     TableRow.LayoutParams
public static class LayoutParams extends LinearLayout.LayoutParams
public int column;  //第几列
public int span;      //占几列宽
public LayoutParams(int column)

十四、           FrameLayout14.1     概述
定义
public class FrameLayout extends ViewGroup
包路径
import android.widget.FrameLayout
子类信息
View
|___ ViewGroup
       |___ FrameLayout
              |___ DatePicker
              |___ TimePicker
              |___ MediaController
              |___ ScrollView
              |___ TabHost
              |___ ViewAnimator
                     |___ ViewFlipper
                     |___ ViewSwitcher
                            |___ ImageSwitcher
                            |___ TextSwitcher
FrameLayout定制为屏幕上一个空白备用区域，可以在其中填充一个单一对象。所有的子元素将会固定在屏幕的左上角，不能为FrameLayout中一个子元素制定位置，后一个子元素将直接在前一个子元素之上进行覆盖填充，把他们全部或部分挡住（除非后一个子元素是透明的）。
14.2     部分方法
public FrameLayout(Context context)
public FrameLayout(Context context, AttributeSet attrs)
public FrameLayout(Context context, AttributeSet attrs, int defStyle)
public void setForegroundGravity(int foregroundGravity)
设置前景对齐方式，缺省为Gravity.FILL
public Drawable getForeground()
public void setForeground(Drawable drawable)
设置drawable，drawable是一个可绘制的“设备”，drawable显示在所有child之上
public void draw(Canvas canvas)
手动把canvas所在的view显示出来，不用重载该函数，注意与onDraw(Canvas)的区别
public boolean gatherTransparentRegion(Region region)
public void setMeasureAllChildren(boolean measureAll)
public boolean getConsiderGoneChildrenWhenMeasuring()
public LayoutParams generateLayoutParams(AttributeSet attrs)
14.3     FrameLayout. LayoutParams
public static class LayoutParams extends MarginLayoutParams
public int gravity = -1;
public LayoutParams(Context c, AttributeSet attrs)
public LayoutParams(int width, int height)
14.4     DatePicker
由3个NumberPicker组成，系统自带一个layout文件:
\cupcake\frameworks\base\core\res\res\layout\date_picker.xml，
这个缺省布局方式为水平LinearLayout，顺序为Month/Day/Year
这个控件dayOfMont的范围校验做的还不好，比如当前时间是2009/3/31，月份减一后为2009/2/31，而这个日期是非法的，但设置为系统日期是可以成功的，结果为2009/3/3。
demo
aipDemos/com.example.android.view/DateWidgets1.java
DateWidgets1.java ~ DateWidgets2.java
菜单路径：API Demos/Views/Date Widgets/
public void setEnabled(boolean enabled)
public void updateDate(int year, int monthOfYear, int dayOfMonth)
monthOfYear：0~11
year：1900~2100
dayOfMonth：1~31
public void init(int year, int monthOfYear, int dayOfMonth,
            OnDateChangedListener onDateChangedListener)
public void setEnabled(boolean enabled)
public int getYear()
public int getMonth()
public int getDayOfMonth()
14.5     TimePicker
demo同上
public void setEnabled(boolean enabled)
public void setOnTimeChangedListener(
OnTimeChangedListener onTimeChangedListener)
public Integer getCurrentHour()
public void setCurrentHour(Integer currentHour)
public void setIs24HourView(Boolean is24HourView)
public boolean is24HourView()
public Integer getCurrentMinute()
public void setCurrentMinute(Integer currentMinute)
public int getBaseline()
14.6     MediaController
demo
aipDemos/com.example.android.media/VideoViewDemo.java
14.7     ScrollView
demo
aipDemos/com.example.android.view/ScrollView1.java
ScrollView1.java ~ ScrollView2.java
aipDemos/com.example.android.view/InternalSelectionScroll.java
菜单路径：API Demos/Views/ Layouts/ScrollView/
ScrollView只支持垂直方向滚动，只能有一个子对象，这个子对象的大小可以超过屏幕大小。这个子对象不能是ListView或TextView，因这两个view是自己管理如何滚动。这个子对象通常使用LinearLayout
public void addView(View child)
public void addView(View child, int index)
public void addView(View child, ViewGroup.LayoutParams params)
public void addView(View child, int index, ViewGroup.LayoutParams params)
只能有一个子元素，在已有一个子元素时再调用会抛出异常IllegalStateException()
public int getMaxScrollAmount()
public boolean isFillViewport()
public void setFillViewport(boolean fillViewport)
true：拉伸高度到viewport的高
public boolean isSmoothScrollingEnabled()
public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled)
true：滚动过程用动画过渡
public boolean pageScroll(int direction)
翻页
public boolean fullScroll(int direction)
翻到底部或顶部
public boolean arrowScroll(int direction)
翻项
View.FOCUS_DOWN
View.FOCUS_UP
public final void smoothScrollBy(int dx, int dy)
相对目前位置滚动(x, y)
public final void smoothScrollTo(int x, int y)
滚动到绝对位置(x, y)
public void scrollTo(int x, int y)
无动画效果滚动
public void fling(int velocityY)
14.8     TabHost
demo
aipDemos/com.example.android.view/Tabs1.java
Tabs1.java~ Tabs3.java
菜单路径：API Demos/Views/ Layouts/LinearLayout/
对应TabActivity
TabHost由TabWidget，TabContent组成。
TabWidget包含多个TabSpec；TabContent是FrameLayout.
TabSpec由tag，indictor，content组成，content可以是
1.ViewId；2.intent；3.TabHost.TabContentFactory。
内部接口TabHost.TabContentFactory
public interface TabContentFactory {
View createTabContent(String tag);
}
在xml文件中定义TabHost需注意两点：
1．TabWidget的id必须指定为"@android:id/tabs"，否则会有RuntimeException
<TabWidget android:id="@android:id/tabs"/>
2．addTab()之前需调用setup()方法，继承TabActivity则不需要
public TabSpec newTabSpec(String tag)
创建一个tab标签，tab标签由3部分组成：tag文字，label文字/图片，content
内部类TabHost.TabSpec，它的每个函数都返回this对象，便于链式表达，比如：
tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1")
                .setContent(R.id.view1));
public class TabSpec {
public TabSpec setIndicator(CharSequence label)；
public TabSpec setIndicator(CharSequence label, Drawable icon)；
public TabSpec setContent(int viewId)；
public TabSpec setContent(TabContentFactory contentFactory)；
public TabSpec setContent(Intent intent)；
}；
public void setup()
public void setup(LocalActivityManager activityGroup)
从xml创建TabHost 才须调setup()，如果TabSpec的content是intent需调用带参数的setup()
public void addTab(TabSpec tabSpec)
public void clearAllTabs()
public void setCurrentTabByTag(String tag)
public void setCurrentTab(int index)
public int getCurrentTab()
public String getCurrentTabTag()
public View getCurrentTabView()
public View getCurrentView()
public TabWidget getTabWidget()
public FrameLayout getTabContentView()
public void onTouchModeChanged(boolean isInTouchMode)
public void setOnTabChangedListener(OnTabChangeListener l)
标签变化触发的监听器
14.9     ViewAnimator
因FrameLayout是多个子元素占同样的显示区域，则在不同子元素切换显示时可以加动画效果。通常是当前显示的view消失，下一个显示的view出现。
public void setDisplayedChild(int whichChild)
public void setDisplayedChild(int whichChild)
public int getDisplayedChild()
public void showNext()
public void showPrevious()
public void addView(View child, int index, ViewGroup.LayoutParams params)
重载了该方法，在加第一个view的状态为View.VISIBLE，之后加的view状态都是View.GONE
public View getCurrentView()
public Animation getInAnimation()
public void setInAnimation(Animation inAnimation)
public Animation getOutAnimation()
public void setOutAnimation(Animation outAnimation)
public void setInAnimation(Context context, int resourceID)
public void setOutAnimation(Context context, int resourceID)
public void setAnimateFirstView(boolean animate)
14.10 ViewFlipper
14.11 ViewSwitcher
14.12 ImageSwitcher
demo
aipDemos/com.example.android.view/ImageSwitcher1.java
菜单路径：API Demos/Views/ ImageSwitcher/
14.13 TextSwitcher
demo
aipDemos/com.example.android.view/TextSwitcher1.java
菜单路径：API Demos/Views/ TextSwitcher/

十五、           RelativeLayout15.1     概述
定义
public class RelativeLayout extends ViewGroup
包路径
import android.widget.RelativeLayout;
子类信息
View
|___ ViewGroup
       |___ RelativeLayout
              |___ DialerFilter
              |___ TwoLineListItem
RelativeLayout的child view位置可以用相对于其他元素或父元素的位置来描述。如果Y的位置依赖于X，则X需先于Y描述。
需要注意的是不要循环依赖，比如RelativeLayout的高设为WRAP_CONTENT，其child设为ALIGN_PARENT_BOTTOM
demo
aipDemos/com.example.android.view/RelativeLayout1.java
RelativeLayout1.java ~ RelativeLayout2.java
菜单路径：API Demos/Views/Layouts/RelativeLayout/
15.2     部分方法
public void setIgnoreGravity(int viewId)
public void setGravity(int gravity)
public void setHorizontalGravity(int horizontalGravity)
public void setVerticalGravity(int verticalGravity)
public int getBaseline()
public LayoutParams generateLayoutParams(AttributeSet attrs)
public static class LayoutParams extends ViewGroup.MarginLayoutParams
LEFT_OF              位于指定child的左边
RIGHT_OF
ABOVE
BELOW
ALIGN_BASELINE     
ALIGN_LEFT                     相对指定child的左边对齐
ALIGN_TOP
ALIGN_RIGHT
ALIGN_BOTTOM
ALIGN_PARENT_LEFT
ALIGN_PARENT_RIGHT
ALIGN_PARENT_TOP
ALIGN_PARENT_BOTTOM
CENTER_IN_PARENT
CENTER_HORIZONTAL
CENTER_VERTICAL
15.3     RelativeLayout.LayoutParams
public static class LayoutParams extends ViewGroup.MarginLayoutParams
public boolean alignWithParent;  
public LayoutParams(Context c, AttributeSet attrs)
public LayoutParams(int w, int h)
public LayoutParams(ViewGroup.LayoutParams source)
public LayoutParams(ViewGroup.MarginLayoutParams source)
public void addRule(int verb)
只用于添加相对于parent的规则，可用addRule(verb, RelativeLayout.TRUE)代替，RelativeLayout.TRUE的值为-1
public void addRule(int verb, int anchor)
verb为相对于兄弟位置，则anchor必须为有效的兄弟id设置才生效，否则无效
verb为相对于parent位置，anchor无论设为何值都生效
public int[] getRules()
15.4     DialerFilter
15.5     TwoLineListItem

十六、           AbsoluteLayout16.1     概述
定义
public class AbsoluteLayout extends ViewGroup
包路径
import android.widget.Absolutelayout;
子类信息
View
|___ ViewGroup
       |___ AbsoluteLayout
              |___ WebView
AbsoluteLayout可以对其子元素指定准确的x/y坐标值，允许元素之间相互重叠，不推荐使用。
16.2     部分方法
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs)
16.3     AbsoluteLayout. LayoutParams
public static class LayoutParams extends ViewGroup.LayoutParams
public int x;    // 在ViewGroup.LayoutParams基础上增加坐标(x, y)
public int y;
public LayoutParams(int width, int height, int x, int y)
public LayoutParams(Context c, AttributeSet attrs)
public LayoutParams(ViewGroup.LayoutParams source)

十七、           WebView17.1     概述
定义
public class WebView extends AbsoluteLayout
        implements ViewTreeObserver.OnGlobalFocusChangeListener,
        ViewGroup.OnHierarchyChangeListener
包路径
import android.webkit.WebView;
子类信息
View
|___ ViewGroup
       |___ AbsoluteLayout
              |___ WebView
WebView用于显示网页，用于可滚动显示的web浏览器或简单显示在线内容的Activity。用WebKit显示网页和在历史记录向前向后操作、放大缩小、搜索文字
<uses-permission android:name="android.permission.INTERNET"/>
demo
aipDemos/com.example.android.view/webview_1.java
菜单路径：API Demos/Views/WebView/
17.2     部分方法
public void clearCache(boolean includeDiskFiles)
public void goBack()
public void goForward()
public String getUrl()
public String getTitle()
public void reload()
public void loadUrl(String url)
public boolean zoomIn()
public boolean zoomOut()
public void goBackOrForward(int steps)