Android 实现长按弹出PopupMenu 菜单栏

<?xml version="1.0" encoding="utf-8"? 
<menu xmlns:android="http://schemas.android.com/apk/res/android" 
  <item android:id="@+id/send" android:title="发送邮件" </item 
  <item android:id="@+id/look" android:title="阅读邮件" </item 
  <item android:id="@+id/delete" android:title="删除邮件" </item 
</menu 

package com.zhangyu.mypopupmenu;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.view.View;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
  private TextView tv1;
  private TextView tv2;
  private TextView tv3;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
  }
  private void initView() {
    tv1 = (TextView) findViewById(R.id.tv1);
    tv2 = (TextView) findViewById(R.id.tv2);
    tv3 = (TextView) findViewById(R.id.tv3);
    tv1.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        myPopupMenu(v);
      }
    });
    tv2.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        myPopupMenu(v);
      }
    });
    tv3.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        myPopupMenu(v);
      }
    });
  }
  private void myPopupMenu(View v) {
    //定义PopupMenu对象
    PopupMenu popupMenu = new PopupMenu(MainActivity.this, v);
    //设置PopupMenu对象的布局
    popupMenu.getMenuInflater().inflate(R.menu.menu, popupMenu.getMenu());
    //设置PopupMenu的点击事件
    popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
      @Override
      public boolean onMenuItemClick(MenuItem item) {
        Toast.makeText(MainActivity.this, "点击了----" + item.getTitle(), Toast.LENGTH_SHORT).show();
        return true;
      }
    });
    //显示菜单
    popupMenu.show();
  }
}