shrink_to_middle.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"> 
    <scale 
        android:interpolator="@android:anim/linear_interpolator" 
        android:fromXScale="1.0" 
        android:toXScale="1.0" 
        android:fromYScale="1.0" 
        android:toYScale="0.0" 
        android:fillAfter="false" 
        android:duration="200" /> 
    <translate 
        android:fromYDelta="0" 
        android:toYDelta="50%" 
        android:duration="200"/> 
</set> 
grow_from_middle.xml
<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android"> 
    <scale 
        android:interpolator="@android:anim/linear_interpolator" 
        android:fromXScale="1.0" 
        android:toXScale="1.0" 
        android:fromYScale="0.0" 
        android:toYScale="1.0" 
        android:fillAfter="false" 
        android:startOffset="200" 
        android:duration="200" /> 
    <translate 
        android:fromYDelta="50%" 
        android:toYDelta="0" 
        android:startOffset="200" 
        android:duration="200"/> 
</set>

通过右键删除一个listView item  需要知道索引号 然后从数组中删除

@Override 
  public boolean onContextItemSelected(MenuItem item) { 
     AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); 
     removeItemFromListById(info.id); 
  } 

屏幕旋转 Activity 的生命周期变化：

1、Activity 不重启请在 AndroidManifest.xml 设置如下：

......

   <activity android:name=".app.CustomDialogActivity"
                android:label="@string/activity_custom_dialog"
                android:configChanges="orientation|keyboardHidden" >

......

2、如果不设置则启动如下：

第一次执行
onCreate(null)
onStart()
onPostCreate()
onResume()
onPostResume()

可将屏幕旋转以后：

onSaveInstanceState()
onPause()
onStop()
onDestroy()
onCreate(Bundle[{android:viewHierarchyState=Bundle[{android:views=android.util.SparseArray@43370a48}], key=123}])
onStart()
onRestoreInstanceState()
onPostCreate()
onResume()
onPostResume()

onDestroy() 证明杀掉了你的 activity， onCreate() 又重新启动了你的 activity

代码：

......

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.custom_dialog_activity);

  Log.w("Test", "onCreate(" + savedInstanceState + ")");
 }

 protected void onRestart() {
  super.onRestart();
  Log.w("Test", "onRestart()");
 }

 protected void onStart() {
  super.onStart();
  Log.w("Test", "onStart()");
 }

 protected void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  Log.w("Test", "onRestoreInstanceState()");
 }

 protected void onPostCreate(Bundle savedInstanceState) {
  super.onPostCreate(savedInstanceState);
  Log.w("Test", "onPostCreate()");
 }

 protected void onResume() {
  super.onResume();
  Log.w("Test", "onResume()");
 }

 protected void onPostResume() {
  super.onPostResume();
  Log.w("Test", "onPostResume()");
 }

 protected void onSaveInstanceState(Bundle outState) {
  outState.putInt("key", 123);
  super.onSaveInstanceState(outState);
  Log.w("Test", "onSaveInstanceState()");
 }

 protected void onPause() {
  super.onPause();
  Log.w("Test", "onPause()");
 }

 protected void onStop() {
  super.onStop();
  Log.w("Test", "onStop()");
 }

 protected void onDestroy() {
  super.onDestroy();
  Log.w("Test", "onDestroy()");
 }

 protected void onNewIntent(Intent intent) {
  super.onNewIntent(intent);
  Log.w("Test", "onNewIntent()");
 }

.....