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把项目中所有的文件都改为继承字BaseActivity这个类,然后在主文件mainactivity.java旁边新建个java类BaseActivity- package com.example.xinwei.lifecycle;
- import android.app.Activity;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v7.app.AppCompatActivity;
- import android.util.Log;
- /**
- * Created by xinwei on 2017/9/21.
- */
- public class BaseActivity extends AppCompatActivity {
- @Override
- protected void onCreate(@Nullable Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- Log.i("BaseActivity",getClass().getSimpleName());
- ActivityCollector.addActivity(this);
- }
- @Override
- protected void onDestroy() {
- super.onDestroy();
- ActivityCollector.removeActivity(this);
- }
- }
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然后再新建个ActivityCollector工具类文件- package com.example.xinwei.lifecycle;
- import android.app.Activity;
- import java.util.ArrayList;
- import java.util.List;
- /**
- * Created by xinwei on 2017/9/22.
- */
- public class ActivityCollector {
- public static List<Activity> activites = new ArrayList<>();
- public static void addActivity(Activity activity){
- activites.add(activity);
- }
- public static void removeActivity(Activity activity){
- activites.remove(activity);
- }
- public static void finishAll(){
- for(Activity activity:activites){
- if(!activity.isFinishing()){
- activity.finish();
- }
- }
- }
- }
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这样就可以很方便的释放空间了。然后将normal_layout.xml文件修改为:- <?xml version="1.0" encoding="utf-8"?>
- <android.support.constraint.ConstraintLayout 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"
- tools:context="com.example.xinwei.lifecycle.NormalActivity">
- <Button
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="finishAll"
- android:onClick="click"/>
- </android.support.constraint.ConstraintLayout>
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NormalActivity.java修改为- package com.example.xinwei.lifecycle;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- public class NormalActivity extends BaseActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.normal_layout);
- }
- public void click(View v){
- ActivityCollector.finishAll();
- }
- }
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进入NormalActivity这个活动后就可以直接退出整个程序了,效果图:
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