Android实现动画PopupWindow

这是主Activity代码：

public class RollActivity extends Activity {   private View view;   private Button btn;   private PopupWindow mPopupWindow;   private View[] btns;      /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);  //  LinearLayout layout=(LinearLayout) view.findViewById(R.id.layout_main);  //  //设置背景图片旋转180  //  Bitmap mBitmap=setRotate(R.drawable.bg_kuang);  //  BitmapDrawable drawable=new BitmapDrawable(mBitmap);  //  layout.setBackgroundDrawable(drawable);                    btn=(Button) this.findViewById(R.id.btn);          btn.setOnClickListener(new OnClickListener(){       @Override     public void onClick(View v) {      // TODO Auto-generated method stub      showPopupWindow(btn);     }                     });                    initPopupWindow(R.layout.popwindow);        }         private void initPopupWindow(int resId){    LayoutInflater mLayoutInflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);       view = mLayoutInflater.inflate(resId, null);               mPopupWindow = new PopupWindow(view, 400,LayoutParams.WRAP_CONTENT);  //  mPopupWindow.setBackgroundDrawable(new BitmapDrawable());//必须设置background才能消失    mPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.bg_frame));    mPopupWindow.setOutsideTouchable(true);        //自定义动画  //  mPopupWindow.setAnimationStyle(R.style.PopupAnimation);    //使用系统动画    mPopupWindow.setAnimationStyle(android.R.style.Animation_Dialog);    mPopupWindow.update();    mPopupWindow.setTouchable(true);    mPopupWindow.setFocusable(true);        btns=new View[3];    btns[0]=view.findViewById(R.id.btn_0);    btns[1]=view.findViewById(R.id.btn_1);    btns[2]=view.findViewById(R.id.btn_2);    btns[0].setOnClickListener(new OnClickListener() {          @Override     public void onClick(View v) {      // TODO Auto-generated method stub      //doSomething     }    });    btns[1].setOnClickListener(new OnClickListener() {          @Override     public void onClick(View v) {      // TODO Auto-generated method stub      //doSomething     }    });    btns[2].setOnClickListener(new OnClickListener() {          @Override     public void onClick(View v) {      // TODO Auto-generated method stub      //doSomething     }    });   }   private void showPopupWindow(View view) {    if(!mPopupWindow.isShowing()){  //   mPopupWindow.showAsDropDown(view,0,0);     mPopupWindow.showAtLocation(view, Gravity.CENTER, 0, 0);    }   }   public Bitmap setRotate(int resId) {    Matrix mFgMatrix = new Matrix();    Bitmap mFgBitmap = BitmapFactory.decodeResource(getResources(), resId);    mFgMatrix.setRotate(180f);    return mFgBitmap=Bitmap.createBitmap(mFgBitmap, 0, 0,       mFgBitmap.getWidth(), mFgBitmap.getHeight(), mFgMatrix, true);   }  }

PopupWindow的布局popwindow.xml 
注意3个LinearLayout里必须设置clickable和background，这样当点击上去的时候才会有点击效果。 
android:clickable="true" 
android:background="@drawable/state_btn_pressed" 

<?xml version="1.0" encoding="utf-8"?>   <LinearLayout      xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:orientation="horizontal"    android:id="@+id/layout_main"    >    <LinearLayout android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="vertical"     android:gravity="center_horizontal"     android:clickable="true"     android:background="@drawable/state_btn_pressed"     android:layout_weight="1"     android:id="@+id/btn_0"     >     <ImageView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:scaleType="fitCenter"      android:src="@drawable/ic_call"      >     </ImageView>     <TextView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:textColor="#000000"      android:textSize="18px"      android:text="电话">     </TextView>    </LinearLayout>    <LinearLayout android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="vertical"     android:gravity="center_horizontal"     android:clickable="true"     android:background="@drawable/state_btn_pressed"     android:layout_weight="1"     android:id="@+id/btn_1"     >     <ImageView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:scaleType="fitCenter"      android:src="@drawable/ic_home"      >     </ImageView>     <TextView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:textColor="#000"      android:textSize="18px"      android:text="空间">     </TextView>    </LinearLayout>        <LinearLayout android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="vertical"     android:gravity="center_horizontal"     android:clickable="true"     android:background="@drawable/state_btn_pressed"     android:layout_weight="1"     android:id="@+id/btn_2"     >     <ImageView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:scaleType="fitCenter"      android:src="@drawable/ic_sms"      >     </ImageView>     <TextView android:layout_width="wrap_content"      android:layout_height="wrap_content"       android:textColor="#000"      android:textSize="18px"      android:text="短信"      >     </TextView>    </LinearLayout>  </LinearLayout>

state_btn_pressed.xml，点击的效果： 

<?xml version="1.0" encoding="utf-8"?>  <selector xmlns:android="http://schemas.android.com/apk/res/android">      <item android:state_pressed="true"          android:drawable="@drawable/bg_btn_pressed"          android:padding="0dp"/>  </selector>

Android 模仿迅雷的 PopupWindow 出现/消失动画 
出现：

<?xml version="1.0" encoding="utf-8"?>  <set xmlns:android="http://schemas.android.com/apk/res/android">   <scale android:fromXScale="0.6" android:toXScale="1.1"    android:fromYScale="0.6" android:toYScale="1.1" android:pivotX="50%"    android:pivotY="50%" android:duration="200" />   <scale android:fromXScale="1.0" android:toXScale="0.91"    android:fromYScale="1.0" android:toYScale="0.91" android:pivotX="50%"    android:pivotY="50%" android:duration="400" android:delay="200" />   <alpha android:interpolator="@android:anim/linear_interpolator"    android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="400" />  </set>

消失： 

<?xml version="1.0" encoding="utf-8"?>  <set xmlns:android="http://schemas.android.com/apk/res/android">   <scale android:fromXScale="1.0" android:toXScale="1.25"    android:fromYScale="1.0" android:toYScale="1.25" android:pivotX="50%"    android:pivotY="50%" android:duration="200" />   <scale android:fromXScale="1.0" android:toXScale="0.48"    android:fromYScale="1.0" android:toYScale="0.48" android:pivotX="50%"    android:pivotY="50%" android:duration="400" android:delay="200" />   <alpha android:interpolator="@android:anim/linear_interpolator"    android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="400" />  </set>

最后用下面的 XML 封装：

<?xml version="1.0" encoding="utf-8"?>  <resources>   <style name="PopupAnimation" parent="android:Animation"    mce_bogus="1">    <item name="android:windowEnterAnimation">@anim/anim_dialog_show</item>    <item name="android:windowExitAnimation">@anim/anim_dialog_hide</item>   </style>  </resources>

来自：http://blog.csdn.net/way_ping_li/article/details/7943661