Android Popupwindow的使用

MainActivity:

package demo.lxiangjian.com.mypopupwindow;

import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private PopupWindow popupWindow;
    private View popupView;
    private ImageView imageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        popupView = getLayoutInflater().inflate(R.layout.popupwindow,null);
        popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        //设置点击PopupWindow以外的区域自动取消
        popupWindow.setOutsideTouchable(true);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
    }

    private void initView() {
        //初始化控件
        imageView = (ImageView) findViewById(R.id.imgView);
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //相对于父容器的位置  gravity:为相对的位置 后两个参数为X/Y轴的偏移量
                popupWindow.showAtLocation(popupView, Gravity.CENTER, 0, 0);
            }
        });
    }

    //popupwindow的点击事件
    public void onClicked(View view) {
        switch (view.getId()){
            case R.id.popupwindow:
                Toast.makeText(MainActivity.this,"popup点击成功",Toast.LENGTH_SHORT).show();
                 //点击后完成要做的其它实现之后关闭popupwindow
                 popupWindow.dismiss();
                break;
        }
    }
}

activity_main:
<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
>
    <ImageView
        android:id="@+id/imgView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_margin="30dp"
        android:src="@mipmap/more_selected"/>
</RelativeLayout>

popupwindow:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/popupwindow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_margin="30dp"
        android:onClick="onClicked"
        android:src="@mipmap/share_weibo"/>

</RelativeLayout>