popupWindow 实现悬浮半透明效果

 
如上图显示弹出一个半透明框
java代码：
//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(); 
    } 
[html] 
soft_calendar_popup.xml的内容： 
<pre name="code" class="html"><?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_pare

补充：移动开发 , Android ,