Back键和Menu键程序退出弹窗以及按钮退出程序弹窗的实现

package com.loaderman.backmenudemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {
    private boolean menu_display = false;
    private PopupWindow    menuWindow;
    private LayoutInflater inflater;
    private View         layout;
    private LinearLayout mClose;
    private LinearLayout mCloseBtn;
    public static MainActivity instance = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        instance=this;
    }
     public void exit(View view ){
         Intent intent = new Intent();
         intent.setClass(MainActivity.this,ExitFromSettings.class);
         startActivity(intent);
     }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {  //获取 back键
            System.out.println(2);
            if (menu_display) {
                System.out.println(3);//如果 Menu已经打开 ，先关闭Menu
                menuWindow.dismiss();
                menu_display = false;
            } else {
                System.out.println(4);
                Intent intent = new Intent();
                intent.setClass(this, Exit.class);
                startActivity(intent);
            }
        } else if (keyCode == KeyEvent.KEYCODE_MENU) {   //获取 Menu键
            if(!menu_display){
                //获取LayoutInflater实例
                inflater =     (LayoutInflater)this.getSystemService(LAYOUT_INFLATER_SERVICE);
                //这里的main布局是在inflate中加入的哦，以前都是直接this.setContentView()的吧？呵呵
                //该方法返回的是一个View的对象，是布局中的根
                layout = inflater.inflate(R.layout.main_menu, null);

                //下面我们要考虑了，我怎样将我的layout加入到PopupWindow中呢？？？很简单
                menuWindow = new PopupWindow(layout, RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT); //后两个参数是width和height
                //menuWindow.showAsDropDown(layout); //设置弹出效果
                //menuWindow.showAsDropDown(null, 0, layout.getHeight());
                menuWindow.showAtLocation(this.findViewById(R.id.activity_main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0); //设置layout在PopupWindow中显示的位置
                //如何获取我们main中的控件呢？也很简单
                mClose = (LinearLayout)layout.findViewById(R.id.menu_close);
                mCloseBtn = (LinearLayout)layout.findViewById(R.id.menu_close_btn);


                //下面对每一个Layout进行单击事件的注册吧。。。
                //比如单击某个MenuItem的时候，他的背景色改变
                //事先准备好一些背景图片或者颜色
                mCloseBtn.setOnClickListener (new View.OnClickListener() {
                    @Override
                    public void onClick(View arg0) {
                        //Toast.makeText(Main.this, "退出", Toast.LENGTH_LONG).show();
                        Intent intent = new Intent();
                        intent.setClass(MainActivity.this,Exit.class);
                        startActivity(intent);
                        menuWindow.dismiss(); //响应点击事件之后关闭Menu
                    }
                });
                menu_display = true;
            }else{
                //如果当前已经为显示状态，则隐藏起来
                menuWindow.dismiss();
                menu_display = false;
            }

            return false;
        }
        return false;
    }
}

package com.loaderman.backmenudemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class ExitFromSettings extends Activity {
    private LinearLayout layout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_exit_from_settings);
        layout=(LinearLayout)findViewById(R.id.exit_layout2);
        layout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(getApplicationContext(), "提示：点击窗口外部关闭窗口！",
                        Toast.LENGTH_SHORT).show();
            }
        });
    }
    @Override
    public boolean onTouchEvent(MotionEvent event){
        finish();
        return true;
    }

    public void exitbutton1(View v) {
        this.finish();
    }
    public void exitbutton0(View v) {
        this.finish();
        MainActivity.instance.finish();//关闭Main 这个Activity
    }
}

package com.loaderman.backmenudemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class Exit extends Activity {
    private LinearLayout layout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.exit_dialog);
        layout=(LinearLayout)findViewById(R.id.exit_layout);
        layout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "提示：点击窗口外部关闭窗口！",
                        Toast.LENGTH_SHORT).show();
            }
        });
    }
    @Override
    public boolean onTouchEvent(MotionEvent event){
        finish();
        return true;
    }

    public void exitbutton1(View v) {
        this.finish();
    }
    public void exitbutton0(View v) {
        this.finish();
        MainActivity.instance.finish();//关闭Main 这个Activity
    }
}

<?xml version="1.0" encoding="utf-8"?>
<!-- 上下滑入式 -->
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="200"
        android:fromYDelta="0"
        android:toYDelta="50%p" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<!-- 上下滑入式 -->
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="200"
        android:fromYDelta="0"
        android:toYDelta="50%p" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    tools:context="com.loaderman.backmenudemo.MainActivity">

    <Button
        android:onClick="exit"
        android:textSize="18sp"
        android:textColor="#fff"
        android:textStyle="bold"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/btn_style_alert_dialog_special"
        android:text="退出程序"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_exit_from_settings"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   >
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_horizontal"
        >

        <LinearLayout
            android:id="@+id/exit_layout2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:layout_gravity="bottom"
            android:orientation="vertical"
            android:background="@drawable/exit_dialog_bg" >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="4dp"
                android:gravity="center"
                android:textColor="#fff"
                android:textSize="16sp"
                android:text="退出后不会删除任何历史数据，下次\n登录依然可以使用本帐号" />
            <Button
                android:id="@+id/exitBtn0"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="退出登录"
                android:textSize="18sp"
                android:textColor="#fff"
                android:layout_marginTop="15dp"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:background="@drawable/btn_style_alert_dialog_special"
                android:gravity="center"
                android:onClick="exitbutton0"
                />
            <Button
                android:id="@+id/exitBtn1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginBottom="10dp"
                android:text="取消"
                android:textSize="18sp"
                android:textColor="#fff"
                android:background="@drawable/btn_style_alert_dialog_cancel"
                android:gravity="center"
                android:onClick="exitbutton1"
                />
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

<?xml version="1.0" encoding="UTF-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/exit_layout"
        android:layout_width="280dp"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:background="@drawable/confirm_dialog_bg2" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="4dp"
            android:padding="5dp"
            android:textColor="#333"
            android:textSize="20sp"
            android:text="退出微信" />
        
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#333"
            android:layout_marginTop="1dp"
            android:padding="10dp"
            android:textSize="16sp"
            android:gravity="center_horizontal"
            android:text="退出后，你将收不到新的消\n息.确定要退出？" /> 
        

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"           
            android:layout_marginTop="33dp"
            android:layout_marginBottom="8dp"
             >
            
            <Button
              android:id="@+id/exitBtn0"
              android:layout_width="110dp"
              android:layout_height="wrap_content"
              android:text="是"
              android:textSize="16sp"
              android:textColor="#fff"
              android:background="@drawable/btn_style_green"
              android:gravity="center"
           android:onClick="exitbutton0"
              />
            
            <Button
              android:id="@+id/exitBtn1"
              android:layout_width="110dp"
              android:layout_height="wrap_content"
              android:layout_marginLeft="10dp"
              android:text="否"
              android:textSize="16sp"
              android:textColor="#333"
              android:background="@drawable/btn_style_white"
              android:gravity="center"
           android:onClick="exitbutton1"
              />
        </LinearLayout>
    </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    
    >
    
    <LinearLayout 
        android:id="@+id/menu_close" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:orientation="vertical" 
       android:gravity="center" 
       android:background="@drawable/menu_bg"
         >
         
        <LinearLayout 
           android:id="@+id/menu_close_btn" 
          android:layout_width="fill_parent" 
          android:layout_height="wrap_content" 
          android:orientation="vertical" 
          android:gravity="center" 
          android:background="@drawable/menu_btn_bg"
          >
       
       <ImageView 
           android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:src="@drawable/btn_close" />
                
       <TextView 
           android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="退出" 
          android:textColor="#eee"/>
      </LinearLayout>             
    </LinearLayout>
</LinearLayout>

<style name="MyDialogStyle">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowFrame">@null</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
    <item name="android:backgroundDimEnabled">true</item>
</style>
<style name="MyDialogStyleBottom" parent="android:Theme.Dialog" >
    <item name="android:windowAnimationStyle">@style/AnimBottom</item>
    <item name="android:windowFrame">@null</item><!--边框-->
    <item name="android:windowIsFloating">true</item><!--是否浮现在activity之上-->
    <item name="android:windowIsTranslucent">true</item><!--半透明-->
    <item name="android:windowNoTitle">true</item><!--无标题-->
    <item name="android:windowBackground">@android:color/transparent</item><!--背景透明-->
    <item name="android:backgroundDimEnabled">true</item><!--模糊-->
</style>
<style name="AnimBottom" parent="@android:style/Animation">
    <item name="android:windowEnterAnimation">@anim/push_bottom_in</item>
    <item name="android:windowExitAnimation">@anim/push_bottom_out</item>
</style>

<activity android:name=".Exit"
  android:theme="@style/MyDialogStyle"/>
<activity android:name=".ExitFromSettings"
  android:theme="@style/MyDialogStyleBottom"/>