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>123456789101112131415161718192021222324
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();
}
});
}
}
}123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869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();
}1234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;
}
});
}
}12345678910111213141516171819202122232425262728293031323334353637383940414243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