android开发过程中遇到的一些问题（包括自定义ProgressBar, Intent, Animation, ListView, RadioButton）

问题如下：

1.在自定义的ListView中，在一个Item中同时添加图片、文字、单选按钮时很困难。

最简单的解决办法（网上摘录）：

把单选按钮用图片表示即可，然后使用SimpleAdapter放进ListView中，代码如下

simpleAdapter = 
new
 SimpleAdapter(
this
, getData(),
                R.layout.picture_info, new
 String[] { imageViewIdStr,
                        pictureNameIdStr, picturePixelIdStr, radioImageIdStr },
                new
 
int
[] { R.id.imageViewId, R.id.pictureNameId,
                        R.id.picturePixelId, R.id.radioImageId });

        listView.setOnItemClickListener(new
 OnListClickListener());
        listView.setAdapter(simpleAdapter);
//////////////////////////////////
private
 
class
 OnListClickListener 
implements
 OnItemClickListener {

        public
 
void
 onItemClick(AdapterView<?> arg0, View arg1, 
int
 arg2,
                long
 arg3) {
            // TODO Auto-generated method stub
            ChangeRadioImage(selectItemIndex, false
);
            ChangeRadioImage(arg2, true
);
            selectItemIndex = arg2;
        }
//主要是下面这个函数用来选中和未选中时交换图片的
                private
 
void
 ChangeRadioImage(
int
 position, 
boolean
 isChangeImage) {
            SimpleAdapter tmpSimpleAdapter = simpleAdapter;
            HashMap<String, Object> hm = (HashMap<String, Object>) simpleAdapter
                    .getItem(position);

            if
 (isChangeImage) {
                hm.put("radioImageId"
, R.drawable.pressed);
            } else
 {
                hm.put("radioImageId"
, R.drawable.press);
            }
            tmpSimpleAdapter.notifyDataSetChanged();
        }

2.在ListView中选中一项时，要弹出一个对话框，框中要有动画，这个困扰我很久，其实就是自定义对话框。

解决办法：

（1）使用AnimationDrawable，但是使用它时必须要以事件触发控件才能使图片活动起来，此办法不佳，代码如下

AlertDialog.Builder alertBuild = 
new
 AlertDialog.Builder(
this
);
//创建对话框构造器
 AlertDialog alertDialog;
 LayoutInflater inflater = LayoutInflater.from(this
);
 View layout = inflater.inflate(R.layout.anim_dialog,
 (ViewGroup) findViewById(R.id.layoutId));
 imageAnim = (ImageView) layout.findViewById(R.id.imageAnimId);
 imageAnim.setBackgroundResource(R.drawable.fly01_anim);
 Button btn = (Button) layout.findViewById(R.id.testButtonId);
 btn.setOnClickListener(new
 OnClickListener() {

 public
 
void
 onClick(View v) {
 // TODO Auto-generated method stub
 AnimationDrawable anim = (AnimationDrawable) imageAnim
 .getBackground();
 anim.stop();
 anim.start();
 }
 });
 alertBuild.setTitle(pictureName[id]);
 alertBuild.setView(layout);
 alertDialog = alertBuild.create();
 return
 alertDialog;

///////////anim_dialog.xml
<?
xml
 
version
=
"1.0"
 
encoding
=
"utf-8"
?>
<
LinearLayout
  xmlns:android
=
"http://schemas.android.com/apk/res/android"
  android:id
=
"@+id/layoutId"
  android:layout_width
=
"fill_parent"
  android:layout_height
=
"fill_parent"
  android:orientation
=
"vertical"
>
  <
ImageView
    android:id
=
"@+id/imageAnimId"
    android:layout_width
=
"wrap_content"
    android:layout_height
=
"wrap_content"
 
/>
<
Button
    android:id
=
"@+id/testButtonId"
    android:layout_width
=
"fill_parent"
    android:layout_height
=
"wrap_content"
    android:text
=
"Test"
/>
</
LinearLayout
>
//////////////////////fly01_anim.xml
<?
xml
 
version
=
"1.0"
 
encoding
=
"utf-8"
?>
<
animation-list
    xmlns:android
=
"http://schemas.android.com/apk/res/android"
    android:oneshot
=
"false"
>
    <
item
 
android:drawable
=
"@drawable/fly01001"
 
android:duration
=
"100"
 
/>
    <
item
 
android:drawable
=
"@drawable/fly01002"
 
android:duration
=
"100"
 
/>
    <
item
 
android:drawable
=
"@drawable/fly01003"
 
android:duration
=
"100"
 
/>
    <
item
 
android:drawable
=
"@drawable/fly01004"
 
android:duration
=
"100"
 
/>
    

  


  
    
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      2011-05-13 09:20
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