【2013.06.27】ExpandableListView等

1. 一个界面布局，list有一级跟二级目录，用到ExpandableListView。使用此ListView，需要定义一个界面布局，一个一级目录布局和一个二级目录布局。可使用SimpleExpandableListAdapter去适配。要更多功能，比如修改一级目录图标，可自定义adapter。

   要去掉ExpandableListView一级目录自带图标，只需设置ExpandableListView属性

 

android:groupIndicator="@null"

 

 

   （1）遇到问题：ExpandableListView一级目录自带的图标修改成自定义图标出错

  原因：SimpleExpandableListAdapter会将所有传进来的控件转换成TextView，导致ClassCastException。

这是SimpleExpandableListAdapter的内部实现方法

 

    private void bindView(View view, Map<String, ?> data, String[] from, int[] to) {
        int len = to.length;

        for (int i = 0; i < len; i++) {
            TextView v = (TextView)view.findViewById(to[i]);
            if (v != null) {
                v.setText((String)data.get(from[i]));
            }
        }
    }

 

这样修改bindView方法即可

public class MyExpandListAdapter extends BaseExpandableListAdapter {

	private ViewBinder mViewBinder;

	private List<? extends Map<String, ?>> mGroupData;
	private int mExpandedGroupLayout;
	private int mCollapsedGroupLayout;
	private String[] mGroupFrom;
	private int[] mGroupTo;

	private List<? extends List<? extends Map<String, ?>>> mChildData;
	private int mChildLayout;
	private int mLastChildLayout;
	private String[] mChildFrom;
	private int[] mChildTo;

	private LayoutInflater mInflater;

	public MyExpandListAdapter(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) {
		this(context, groupData, groupLayout, groupLayout, groupFrom, groupTo,
				childData, childLayout, childLayout, childFrom, childTo);
	}

	public MyExpandListAdapter(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) {
		this(context, groupData, expandedGroupLayout, collapsedGroupLayout,
				groupFrom, groupTo, childData, childLayout, childLayout,
				childFrom, childTo);
	}

	public MyExpandListAdapter(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) {
		mGroupData = groupData;
		mExpandedGroupLayout = expandedGroupLayout;
		mCollapsedGroupLayout = collapsedGroupLayout;
		mGroupFrom = groupFrom;
		mGroupTo = groupTo;

		mChildData = childData;
		mChildLayout = childLayout;
		mLastChildLayout = lastChildLayout;
		mChildFrom = childFrom;
		mChildTo = childTo;

		mInflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	public Object getChild(int groupPosition, int childPosition) {
		return mChildData.get(groupPosition).get(childPosition);
	}

	public long getChildId(int groupPosition, int childPosition) {
		return childPosition;
	}

	/**
	 * Instantiates a new View for a child.
	 * 
	 * @param isLastChild
	 *            Whether the child is the last child within its group.
	 * @param parent
	 *            The eventual parent of this new View.
	 * @return A new child View
	 */
	public View newChildView(boolean isLastChild, ViewGroup parent) {
		return mInflater.inflate((isLastChild) ? mLastChildLayout
				: mChildLayout, parent, false);
	}

	public int getChildrenCount(int groupPosition) {
		return mChildData.get(groupPosition).size();
	}

	public Object getGroup(int groupPosition) {
		return mGroupData.get(groupPosition);
	}

	public int getGroupCount() {
		return mGroupData.size();
	}

	public long getGroupId(int groupPosition) {
		return groupPosition;
	}

	/**
	 * Instantiates a new View for a group.
	 * 
	 * @param isExpanded
	 *            Whether the group is currently expanded.
	 * @param parent
	 *            The eventual parent of this new View.
	 * @return A new group View
	 */
	public View newGroupView(boolean isExpanded, ViewGroup parent) {
		return mInflater.inflate((isExpanded) ? mExpandedGroupLayout
				: mCollapsedGroupLayout, parent, false);
	}

	public boolean isChildSelectable(int groupPosition, int childPosition) {
		return true;
	}

	public boolean hasStableIds() {
		return true;
	}


	private void bindView(View view, Map<String, ?> data, String[] from,
			int[] to) {
		int len = to.length;

		boolean isBound = false;
		for (int i = 0; i < len; i++) {

			final View v = view.findViewById(to[i]);

			if (v != null) {
				final Object _data = data.get(from[i]);
				String text = _data == null ? "" : data.toString();
				if (text == null) {
					text = "";
				}

				if (mViewBinder != null) {// 如果Binder不为空,使用Binder进行处理
					isBound = mViewBinder.setViewValue(v, data.get(from[i]),
							text);
				}

				if (!isBound) {// 如果Binder跳过,使用原来的方法进行处理
					TextView _v = (TextView) v;
					_v.setText((String) data.get(from[i]));
				}
			}
		}
	}

	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		View v;
		if (convertView == null) {
			v = newGroupView(isExpanded, parent);
		} else {
			v = convertView;
		}

		bindView(v, mGroupData.get(groupPosition), mGroupFrom, mGroupTo);
		return v;
	}

	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		View v;
		if (convertView == null) {
			v = newChildView(isLastChild, parent);
		} else {
			v = convertView;
		}

		bindView(v, mChildData.get(groupPosition).get(childPosition),
				mChildFrom, mChildTo);
		return v;
	}

	public void setViewBinder(ViewBinder mViewBinder) {
		this.mViewBinder = mViewBinder;
	}

	/**
	 * 提供视图渲染的绑定器
	 * 
	 * @author Atomic
	 */
	public static interface ViewBinder {
		boolean setViewValue(View view, Object data, String textRepresentation);
	}

 代码摘自http://www.eoeandroid.com/code/2011/1202/220.html

 

 

 

修改完以后，可以在Activity代码中像SimpleExpandableListAdapter一样使用。在一级目录的布局中就可以新添加ImageView属性，使用自定义的图标了。

 

public class ProjectTableExActivity extends Activity {

	private ExpandableListView lv;
	// private SimpleExpandableListAdapter adapter;
	private MyExpandListAdapter adapter1;
	private List<List<Map<String, Object>>> child;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.project_table_expandlist);

		child = new ArrayList<List<Map<String, Object>>>();
		lv = (ExpandableListView) findViewById(R.id.projectTabExpandList);

		adapter1 = new MyExpandListAdapter(this,
				groupData(new String[] { "你好","我好","大家好" }),
				R.layout.project_table_item, new String[] { "img", "text" },
				new int[] { R.id.item_img2, R.id.item_txt3 }, child,
				R.layout.project_table_child, new String[] {}, new int[] {});

		adapter1.setViewBinder(new MyExpandListAdapter.ViewBinder() {

			@Override
			public boolean setViewValue(View view, Object data,
					String textRepresentation) {
				switch (view.getId()) {
				case R.id.item_img2: {//要替换成的图标的Id
					if (view instanceof ImageView) {
						ImageView _view = (ImageView) view;
						if (data instanceof Integer) {
							_view.setImageResource((Integer) data);
						} else if (data instanceof Drawable) {
							_view.setImageDrawable((Drawable) data);
						} else {
							throw new IllegalArgumentException(
									"The Data is Not a Drawable Or Resource Id!");
						}
					}

					return true;
				}
				}

				return false;
			}
		});
	
		lv.setAdapter(adapter1);

	}

	private List<? extends Map<String, ?>> groupData(String[] str) {

		ArrayList<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

		// Field field;
		try {

			for (int i = 0; i < str.length; i++) {

				Resources res = getResources();
				int lable = res.getIdentifier("cv_lable" + (i + 1), "drawable",
						getPackageName());

				/*
				 * field = R.drawable.class.getField("R.drawable.cv_lable" + (i
				 * + 1)); int lable = field.getInt(new R.drawable());
				 */

				Map map = new HashMap<String, Object>();
				map.put("img", lable);
				map.put("text", str[i]);
				list.add(map);

				List<Map<String, Object>> child1 = new ArrayList<Map<String, Object>>();
				Map<String, Object> childdata = new HashMap<String, Object>();

				child1.add(childdata);
				child.add(child1);
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		return list;
	}

}

 

注意取得lable的方法

 

（2）遇到问题：二级目录打不开

原因：在一级目录中有按钮控件存在

给按钮控件添加属性

 android:focusable="false"

 

 

 

2.自定义EditText的背景图和边框

 

背景图可直接修改EditText的background

 

新建类继承自EditText，绘制边框

 

public class MyEditText extends EditText {
	public MyEditText(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	@Override
	protected void onDraw(Canvas canvas) {

		Paint paint = new Paint();
		paint.setStyle(Style.STROKE);
		paint.setStrokeWidth(2);
		if (this.isFocused() == true)
			paint.setColor(Color.parseColor("#D9DAD4"));
		else
			paint.setColor(Color.parseColor("#D9DAD4"));
		canvas.drawRoundRect(
				new RectF(this.getScrollX(),  this.getScrollY(), this
						.getWidth()  + this.getScrollX(), this.getHeight()
						+ this.getScrollY() ), 3, 3, paint);
		super.onDraw(canvas);
	}

}

 

代码源自网络

 

在xml中引用时直接使用这个自定义的EditText即可【全类名】