用PopupWindow实现弹出菜单（弹出的菜单采用自定义布局）

    

用PopupWindow实现弹出菜单是一个比较好的方式。当然我们还有一个类PopupMenu也能实现弹出菜单，但那个太过于局限了，所以不是很推荐。

这个实例的效果是这样的：点击按钮后，一个菜单从屏幕的右边滑入到屏幕中，点击按钮/空白处后菜单消失。

布局文件时一个按钮，我就不贴出代码了。下面是菜单的布局：

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

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="1" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="3" />

    <Button
        android:id="@+id/closet_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="关闭" />

</LinearLayout>

MainActivity.java

package com.kale.popup;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
    LayoutInflater inflater = null;
    private PopupWindow popupWindow;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        initPopWindow();
    }

    /**
     * 初始化popWindow
     * */
    private void initPopWindow() {
        View popView = inflater.inflate(R.layout.menu, null);
        popupWindow = new PopupWindow(popView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        popupWindow.setBackgroundDrawable(new ColorDrawable(0));
        //设置popwindow出现和消失动画
        popupWindow.setAnimationStyle(R.style.PopMenuAnimation);
        Button btn01 = (Button)popView.findViewById(R.id.button1);
        btn01.setOnClickListener(this);
        Button btn02 = (Button)popView.findViewById(R.id.button2);
        btn02.setOnClickListener(this);
        Button btn03 = (Button)popView.findViewById(R.id.button3);
        btn03.setOnClickListener(this);
        Button closetBtn = (Button)popView.findViewById(R.id.closet_btn);
        closetBtn.setOnClickListener(this);

    }

    public void buttonListener(View v) {
        showPop(v, 0, 0, 0);
    }

    /**
     * 显示popWindow
     * */
    public void showPop(View parent, int x, int y,int postion) {
        //设置popwindow显示位置
        popupWindow.showAsDropDown(parent);
        //获取popwindow焦点
        popupWindow.setFocusable(true);
        //设置popwindow如果点击外面区域，便关闭。
        popupWindow.setOutsideTouchable(true);
        popupWindow.update();

    }

    @Override
    public void onClick(View v) {
        Button btn = (Button) v;
        Toast.makeText(MainActivity.this, btn.getText(), 0).show();
        popupWindow.dismiss();
    }

}

菜单的动画

style.xml

    <style name="PopMenuAnimation" parent="@android:style/Animation">
        <item name="android:windowEnterAnimation">@anim/slide_left_in</item>
        <item name="android:windowExitAnimation">@anim/slide_right_out</item>
    </style>

slide_left_in.xml

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

    <translate
        android:duration="200"
        android:fromXDelta="100.0%p"
        android:toXDelta="0.0" />

</set>

slide_right_out.xml

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

    <translate
        android:duration="100"
        android:fromXDelta="0.0"
        android:toXDelta="100.0%p" />

</set>