Activity的LaunchMode和退出应用程序

1.Activity的启动模式    <1>Standard（默认-标准模式）        自己可以启动自己（会创新一个新的Activity）    <2>SingleTop（顶单例模式）        在栈顶只允许有一个相同的Activity        自己不能启动自己    <3>SingleTask（内单例模式）        如果要启动的Activity存在，则干掉要启动的Activity上面的所有的Activity    <4>SingleInstance（全局单例模式）2.退出应用程序    <1>递归退出    <2>栈退出        Application:多个组件之间数据共享（全局）因为页面太多就不放效果图了<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns: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:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent" tools:context="com.zking.administrator.app6.MainActivity"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:background="#66ffff00"android:text="这是MainActivity"android:textSize="30sp"/><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/tv_main_text"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="跳自己"android:onClick="jumpMain"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="跳B"android:onClick="jumpB"/><Buttonandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="退出应用程序"android:onClick="exit"/></LinearLayout>

<?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:c
4000
ontext="com.zking.administrator.app6.BActivity">

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#66ff00ff"
android:text="这是BActivity"
android:textSize="30sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_b_text"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="跳MMain"
android:onClick="jumpMain"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="退出应用程序"
android:onClick="exit"/>
</LinearLayout>

package com.zking.administrator.app6;

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);
//this打印当前地址   this.getTaskId()拿当前Activity所占任务的ID
//如果你第一个或第二个ID不一样的话就代表有俩个栈，一样的话就代表一个栈
tv_main_text.setText("当前Activity实例（在内存里的地址）："+this+"\n当前任务栈"+this.getTaskId());
//获取MyApplication
myApplication = (MyApplication) getApplication();
myApplication.add(this);
}

public void jumpMain(View view){
//自己跳自己
Intent intent=new Intent(this,MainActivity.class);
//启动(栈用普通的方式启动)
startActivity(intent);
//递归的退出方式用startActivityForResult启动
//startActivityForResult(intent,0x101);
}
public void jumpB(View view){
//跳B页面
Intent intent=new Intent(this,BActivity.class);
startActivity(intent);

}
//递归的退出方式
public void exit(View view){
//finish();//退出当前的Activity
//finish会调用onDestroy
//System.exit(0);//退出当前Activity
//system不会用onDestroy
//用myApplication退出
myApplication.exit();
}
//    @Override
//    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//        super.onActivityResult(requestCode, resultCode, data);
//        exit(null);
//    }

@Override
protected void onDestroy() {
super.onDestroy();
Log.i("text","onDestroy");
}

}

package com.zking.administrator.app6;

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);
tv_b_text.setText("当前Activity地址："+this+"\nTastId:"+this.getTaskId());
//获取MyApplication
myApplication = (MyApplication) getApplication();
myApplication.add(this);
}
public void jumpMain(View view){
//跳Main页面
Intent intent=new Intent(this,MainActivity.class);
startActivity(intent);
}

//退出
public void exit(View view){
//finish();//退出当前的Activity
//System.exit(0);//退出当前Activity
//用myApplication退出
myApplication.exit();
}
}

用栈退出要写一个自定义的MyApplication

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.
*/

public class MyApplication extends Application{
//定义一个对象集合
private List<Activity> activities=new ArrayList<>();

//写一个方法给集合加值
public void add(Activity activity){
activities.add(activity);
}

//写一个退出的方法
public void exit(){
//遍历activities
for (Activity activity : activities) {
//调用每一个activity的finish
activity.finish();
}
}
}