基于popupWindow实现悬浮半透明效果

//清空数据   private void ShowPopup() {     LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);     ViewGroup mView = (ViewGroup) mLayoutInflater.inflate(         R.layout.soft_calendar_popup, null, true);     final PopupWindow popupWindow = new PopupWindow(mView,         LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, true);     final RadioButton radio1 = (RadioButton) mView         .findViewById(R.id.radio0);     final RadioButton radio2 = (RadioButton) mView         .findViewById(R.id.radio1);     final RadioButton radio3 = (RadioButton) mView         .findViewById(R.id.radio2);      Button btn1 = (Button) mView.findViewById(R.id.button1);     btn1.setOnClickListener(new OnClickListener() {        @Override       public void onClick(View v) {         //确定按钮实现的操作          popupWindow.dismiss();       }     });     Button btn2 = (Button) mView.findViewById(R.id.button2);     btn2.setOnClickListener(new OnClickListener() {        @Override       public void onClick(View v) {         // 取消按钮实现的操作         popupWindow.dismiss();       }     });      popupWindow.setBackgroundDrawable(new BitmapDrawable());     popupWindow.showAtLocation(findViewById(R.id.RelativeLayout1),         Gravity.CENTER | Gravity.CENTER, 0, 0);//在屏幕的中间位置显示     popupWindow.update();   } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="460px"   android:layout_height="423px"   android:background="@drawable/soft_calendar_popup_bg"   android:orientation="vertical" >    <TextView     android:id="@+id/textView1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_marginTop="30px"     android:gravity="center"     android:text="提示"     android:textColor="@android:color/white"     android:textSize="25dip" />    <RadioGroup     android:id="@+id/radioGroup1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_marginLeft="100px"     android:layout_marginRight="100px"     android:layout_marginTop="30px" >      <RadioButton       android:id="@+id/radio0"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:checked="true"       android:text="清除当日缓存"       android:textSize="20dip"       android:textColor="@android:color/white" />      <RadioButton       android:id="@+id/radio1"       android:textSize="20dip"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:text="清除当月缓存"       android:textColor="@android:color/white" />      <RadioButton       android:id="@+id/radio2"       android:textSize="20dip"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:text="清除全部缓存"       android:textColor="@android:color/white" />   </RadioGroup>    <LinearLayout     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_marginTop="15dip"     android:gravity="center_horizontal" >      <Button       android:id="@+id/button1"       android:layout_width="158px"       android:layout_height="wrap_content"       android:layout_marginRight="30dip"       android:background="@drawable/btn2"       android:gravity="center"       android:text="确定"       android:textColor="@android:color/white" />      <Button       android:id="@+id/button2"       android:layout_width="158px"       android:layout_height="wrap_content"       android:background="@drawable/btn1"       android:gravity="center"       android:text="返回"       android:textColor="#0072D7" />   </LinearLayout>  </LinearLayout>