转：仿QQ长按弹出功能菜单

android app普遍常用的弹出上下文菜单是列表式的。QQ列表，在上方弹出冒泡效果菜单，如图

这里讲解一下如何写出这个效果：

图片资源：两张图片，可以拼接成如上效果。

首先，我们需要写布局文件： 
layout_pop.xml (mipmap是android studio 的引用图片的写法，以前常用@drawable/xxx)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="10dp">

    <Button
        android:id="@+id/bt_l"
        style="@style/PopBtuton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/bg_pop_l_t"
        android:text="复制" />

    <Button
        android:id="@+id/bt_r"
        style="@style/PopBtuton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/bt_l"
        android:background="@mipmap/bg_pop_r_t"
        android:text="回复" />

</RelativeLayout>

布局效果 

接下来是重点： 
先贴代码 
PopOptionUtil.java

package com.mjc.popdemo;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;

/**
 * Created by imac on 15/7/8.
 */
public class PopOptionUtil {

    private Context mContext;
    private int popupWidth;
    private int popupHeight;
    private PopupWindow popupWindow;
    private PopClickEvent mEvent;
    private Button preBt;
    private Button nextBt;

    public PopOptionUtil(Context context) {
        mContext = context;
        View popupView = LayoutInflater.from(mContext).inflate(R.layout.layout_pop, null);
        preBt = (Button) popupView.findViewById(R.id.bt_l);
        nextBt = (Button) popupView.findViewById(R.id.bt_r);
        popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT, true);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        popupView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        popupWidth = popupView.getMeasuredWidth();
        popupHeight = popupView.getMeasuredHeight();
    }

    public void show(View view) {
        initEvent();
        int[] location = new int[2];
        view.getLocationOnScreen(location);
        popupWindow.showAtLocation(view, Gravity.NO_GRAVITY, (location[0] + view.getWidth() / 2) - popupWidth / 2,
                location[1] - popupHeight);
    }

    public void setOnPopClickEvent(PopClickEvent mEvent) {
        this.mEvent = mEvent;
    }

    private void initEvent() {
        if (mEvent != null) {
            preBt.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mEvent.onPreClick();
                }
            });
            nextBt.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mEvent.onNextClick();
                }
            });

        }
    }
}

其中Event是自定义的接口，用来监听两个Button的事件的

下面就是 
PopClickEvent.java

public interface PopClickEvent {
    public void onPreClick();
    public void onNextClick();
}

使用方法：

package com.mjc.popdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    View bt;
    PopOptionUtil mPop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt = findViewById(R.id.test);
        mPop = new PopOptionUtil(this);
        mPop.setOnPopClickEvent(new PopClickEvent() {
            @Override
            public void onPreClick() {
                Toast.makeText(MainActivity.this,"置顶",Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNextClick() {
                Toast.makeText(MainActivity.this,"删除",Toast.LENGTH_SHORT).show();
            }
        });
        bt.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                mPop.show(view);
                bt.setSelected(true);
                return true;
            }
        });
    }

}

最终效果： 

是不是很简单的呢？快动手试试吧

参考：http://blog.csdn.net/u011494050/article/details/38691475

http://blog.csdn.net/meijian531161724/article/details/46804281