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Android使用popUpWindow带遮罩层的弹出框

︶ㄣ速达网 メ
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上次项目中实现了新功能，就一直想添加到博客里来着，惰性发作起来简直太可怕，不说了，跟着一起写吧，三步即可实现简单的弹出框功能，首先看效果——

Android使用popUpWindow带遮罩层的弹出框

首先：主页面布局，触发控件一定要有，再有就是给根标签设置id


<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>

第二步：弹出框样式设置


<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
 —《菜根谭》"
    android:textColor="#000"
    android:background="@drawable/layout_border" />
</LinearLayout>

最后：就是主代码了


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);
  }
}

弹出框的位置在触发控件下方居中，如果有明确的横纵坐标，可以用下面的来实现


taxWindow.showAsDropDown(anchor, xOffset, yOffset);
好了，这样就实现了。