Activity的模式，退出应用程序

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1.Activity的四种模式：

运用launchMode();选择模式。

standard:标准模式。自己可调用自己的Activity。

singleTop:顶单例模式。不可以直接调用自己，通过间接的方式获取Activtity。两个一样Activity

但地址不同。

singleTask:内单例模式。不可以直接调用自己，每调用一个Activity，除掉此Activity上面的所有

Activity.

singleInstance:全局单例模式。不可以直接调用自己，调用的Activity的栈是不同，两个Activity相互

切换。

2.退出应用程序：

递归：

main.xml:

<Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="jump"        android:text="跳B"/>

 <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="exit"        android:text="退出"/>

main_activity:

public void jump(View view){         //跳转页面         Intent intent=new Intent(this,BActivity.class);         //为目的而跳转        startActivityForResult(intent,0x200);    }

public void exit(View view){       finish();    }

@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {     super.onActivityResult(requestCode, resultCode, data);     exit(null); }

b.xml:

<Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="jump"        android:text="跳A"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="exit"        android:text="退出"/>

b_activity

 public void jump(View view){        Intent intent=new Intent(this,MainActivity.class);        setResult(0x110,intent);    }    public void exit(View view){        finish();    }

2.application 退出应用程序

package 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{    public List<Activity> activities=new ArrayList<>();    public  void addActivity(Activity activity){        activities.add(activity);    }    public  void exitActivity(){        for (Activity a : activities) {            a.finish();        }    }}

<?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.app13.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/main_text"        android:text="这是A页面"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="jump"        android:text="跳B"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="jumpMe"        android:text="跳自己"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="exit"        android:text="退出"/></LinearLayout>

package com.zking.app13;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.TextView;import application.Myapplication;public class MainActivity extends AppCompatActivity {    private TextView textView;    private Myapplication myapplication;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView) findViewById(R.id.main_text);        textView.setText("当前栈"+this.getTaskId()+"\n当前Activity："+this);        myapplication = (Myapplication) getApplication();        myapplication.addActivity(this);    }    public void jump(View view){        Intent intent=new Intent(this,BActivity.class);        startActivity(intent);    }    public void jumpMe(View view){        Intent intent=new Intent(this,MainActivity.class);        startActivity(intent);    }    public void exit(View view){        myapplication.exitActivity();    } }

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="match_parent"              android:layout_height="match_parent">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/b_text"        android:text="B页面"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="jump"        android:text="跳A"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="exit"        android:text="退出"/></LinearLayout>

package com.zking.app13;import android.app.Application;import android.content.Intent;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.TextView;import application.Myapplication;/** * Created by Administrator on 2017/6/17 0017. */public class BActivity extends AppCompatActivity{    private TextView textView;    private Myapplication myapplication;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.b);        textView = (TextView) findViewById(R.id.b_text);        textView.setText("当前栈"+this.getTaskId()+"\n当前Activity："+this);        myapplication = (Myapplication) getApplication();        myapplication.addActivity(this);    }    public void jump(View view){        Intent intent=new Intent(this,MainActivity.class);        startActivity(intent);    }    public void exit(View view){        myapplication.exitActivity();    }}

//注意要配置自己的application

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