Android自定义PopWindow带动画向下弹出效果

package dmpte.mytest;import android.content.Context;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.widget.PopupWindow;import android.widget.RelativeLayout;public class PopWin extends PopupWindow { private Context mContext; private View view; public PopWin(final Context mContext, View.OnClickListener itemsOnClick, int flag) {  this.mContext = mContext;  this.view = LayoutInflater.from(mContext).inflate(R.layout.view_popwin, null);  // 设置外部可点击  this.setOutsideTouchable(true);  /* 设置弹出窗口特征 */  // 设置视图  this.setContentView(this.view);  // 设置弹出窗体的宽和高  this.setHeight(RelativeLayout.LayoutParams.WRAP_CONTENT);//高  this.setWidth(RelativeLayout.LayoutParams.MATCH_PARENT);//宽  // 设置弹出窗体可点击  this.setFocusable(true);  // 设置弹出窗体显示时的动画，从底部向上弹出  this.setAnimationStyle(R.style.take_photo_anim);//  mMenuView添加OnTouchListener监听判断获取触屏位置如果在选择框外面则销毁弹出框  this.view.setOnTouchListener(new View.OnTouchListener() {   @Override   public boolean onTouch(View v, MotionEvent event) {    int height = view.findViewById(R.id.pop_layout).getHeight();    int y = (int) event.getY();    if (event.getAction() == MotionEvent.ACTION_DOWN) {    //Y表示手指点击的位置，屏幕顶端为0，往下一次递增。height是popwin的高度。y > height就表示手指点在popwin的外面，然后关闭popwin     if (y > height) {      dismiss();     }    }    return true;   }  }); }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/pop_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@null" android:orientation="vertical"> <LinearLayout  android:layout_width="match_parent"  android:layout_height="170dp"  android:background="#ffff"  android:orientation="vertical">  <TextView   android:id="@+id/tv_jingtai"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:layout_gravity="center"   android:layout_marginTop="2dp"   android:gravity="center"   android:text="移动静态"   android:textColor="#f123" /> </LinearLayout></LinearLayout>

<style name="popwin_anim" parent="android:Animation">    <item name="android:windowEnterAnimation">@anim/pop_enter_anim</item>    <item name="android:windowExitAnimation">@anim/pop_exit_anim</item></style>

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false"> <!-- 平移动画 --> <translate  android:duration="500"  android:fromYDelta="-100%p"  android:toYDelta="0" /></set>

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false"> <!-- 平移动画 --> <translate  android:duration="1000"  android:fromYDelta="0"  android:toYDelta="-100%p" /></set>

//让背景变暗 WindowManager.LayoutParams lp = getWindow().getAttributes();    lp.alpha = 0.7f;    getWindow().setAttributes(lp);    //弹出窗体    PopWin popWin_ = new PopWin(this, null, 0);    popWin_.showAsDropDown(findViewById(R.id.relativeLayout));    //监听popwin是否关闭，关闭的话让背景恢复    popWin_.setOnDismissListener(new PopupWindow.OnDismissListener() {     @Override     public void onDismiss() {      WindowManager.LayoutParams lp = getWindow().getAttributes();      lp.alpha = 1f;      getWindow().setAttributes(lp);  }});