android 退出应用程序

    一、android 退出应用程序主要有三种方法：递归退出；栈退出；报错退出。这篇博客主要介绍前两种，递归退出和栈退出

   

    二、递归退出

      递归退出的原理就是在主界面跳子界面时用startActivityForResult()这个方法进行跳转，在子界面退出时将子界面关闭，而后主界面直接调关闭的方法，废话不多说，看代码

     主界面（MainActivity）

     

package com.zking.administrator.g160628_android13_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.zking.application.MyApplication;

public class MainActivity extends AppCompatActivity {

    private TextView tv_main_text;
 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_main_text = (TextView) findViewById(R.id.tv_main_text);
 
    }
    
    
    @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
        exit(null);
    }

 
}

     子界面

package com.zking.administrator.g160628_android13_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.zking.application.MyApplication;

public class BActivity extends AppCompatActivity {

    private MyApplication myApplication;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_b);
        TextView tv_b_text= (TextView) findViewById(R.id.tv_b_text);
       
    }
    public void jumpMain(View view){
        Intent intent=new Intent(this,MainActivity.class);
        startActivity(intent);
    }
   
}

二、栈退出

    自定义一个Application 

     

package com.zking.application;

import android.app.Activity;
import android.app.Application;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2017/6/17 0017.
 */

public class MyApplication extends Application {
    private List<Activity> activities=new ArrayList<>();
    public void add(Activity activity){
        activities.add(activity);
    }
    public void exit(){
        for (Activity activity : activities) {
            activity.finish();
        }
    }
}

主界面

package com.zking.administrator.g160628_android13_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.zking.application.MyApplication;

public class MainActivity extends AppCompatActivity {

    private TextView tv_main_text;
    private MyApplication myApplication;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_main_text = (TextView) findViewById(R.id.tv_main_text);

        //获取MyApplication
        myApplication = (MyApplication) getApplication();
        myApplication.add(this);

    }
   
    public void exit(View view){
        myApplication.exit();
    }

}

子界面

 

package com.zking.administrator.g160628_android13_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.zking.application.MyApplication;

public class BActivity extends AppCompatActivity {

    private MyApplication myApplication;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_b);
        TextView tv_b_text= (TextView) findViewById(R.id.tv_b_text);
        //获取MyApplication
        myApplication = (MyApplication) getApplication();
        myApplication.add(this);
    }
   
    public void exit(View view){
        myApplication.exit();
    }
}

布局文件

主界面布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.zking.administrator.g160628_android13_activity.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这是MainActivity"
        android:textSize="30sp"
        android:background="#00ff00"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv_main_text"
        android:textSize="25sp"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="退出应用程序"
        android:onClick="exit"
        />

</LinearLayout>

子界面布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.zking.administrator.g160628_android13_activity.BActivity">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这是BActivity"
        android:textSize="30sp"
        android:background="#0000ff"
        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:id="@+id/tv_b_text"
        />
   
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="退出应用程序"
        android:onClick="exit"
        />
</LinearLayout>