Android使用popUpWindow带遮罩层的弹出框

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.android_popupwindow.MainActivity" > <ScrollView  android:layout_width="fill_parent"  android:layout_height="wrap_content"   android:scrollbars="none">  <RelativeLayout   android:layout_width="fill_parent"   android:layout_height="wrap_content">   <ImageView    android:id="@+id/p"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:scaleType="centerCrop"    android:src="@drawable/p"/>   <ImageView    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_below="@+id/p"    android:scaleType="centerCrop"    android:src="@drawable/p"/>  <Button    android:id="@+id/btn"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="click me"     android:background="#fff"    android:padding="10dip"/>  </RelativeLayout> </ScrollView></RelativeLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content" android:layout_height="wrap_content" tools:context="com.example.adf.MainActivity" > <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:gravity="center"  android:text="交友需带三分侠气，做人要存一点素心/n ―《菜根谭》"  android:textColor="#000"  android:background="@drawable/layout_border" /></LinearLayout>

public class MainActivity extends Activity { private RelativeLayout layout; private Button btn; private boolean isFold=true; // 判断是否显示 private PopupWindow taxWindow; // 弹出框 private TextView tv=null; // 遮罩层  @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  layout=(RelativeLayout)findViewById(R.id.layout);  btn=(Button)findViewById(R.id.btn);  btn.setOnClickListener(new View.OnClickListener(){   @Override   public void onClick(View v){   if(isFold){   isFold=false;    <span style="white-space:pre"> </span>showTaxDetail(v);   tv=new TextView(MainActivity.this);    <span style="white-space:pre"> </span>tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT));    <span style="white-space:pre"> </span>tv.setBackgroundColor(Color.parseColor("#66000000"));    <span style="white-space:pre"> </span>tv.setClickable(true);    <span style="white-space:pre"> </span>tv.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  isFold=true;    taxWindow.dismiss();    layout.removeView(tv);  } });    <span style="white-space:pre"> </span>layout.addView(tv);   }   else{   isFold=true;   taxWindow.dismiss();   layout.removeView(tv);   }   }  }); }  private void showTaxDetail(View view){  LayoutInflater inflater=LayoutInflater.from(this);  // 加载弹出框的布局  View contentView=inflater.inflate(R.layout.ewj_tax_detail, null);  contentView.measure(0,0);  taxWindow=new PopupWindow(contentView,contentView.getMeasuredWidth(),contentView.getMeasuredHeight(),true);  //taxWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_launcher));  //taxWindow.setOutsideTouchable(true);  taxWindow.setFocusable(false);  int[] location = new int[2];   // 得到按钮控件的坐标，便于定位弹出框位置  btn.getLocationInWindow(location);  int taxWindowWidth=taxWindow.getContentView().getMeasuredWidth();  int screenWidth = getWindowManager().getDefaultDisplay().getWidth();   taxWindow.showAtLocation(btn,Gravity.NO_GRAVITY,(screenWidth-taxWindowWidth)/2,location[1]+95); }}

taxWindow.showAsDropDown(anchor, xOffset, yOffset);