利用廣播機制，實現程序的強制退出。

前面有篇博文，寫到了一鍵退出，這里利用到了那里的ActivityCollector的集合和BaseActivity

功能：打開程序后，先登錄，登錄成功后，進入主頁面，主頁面有個按鈕，點擊后彈出窗口，用戶點擊 “是”之后退出程序

1、ActivityCollectorpackage?com.yuanlp.forceexit;

/**

*?Created?by?原立鵬?on?2017/6/28.

*/

import?android.app.Activity;

import?java.util.ArrayList;

import?java.util.List;

/**

*?activity集合

*/

public?class?ActivityCollector?{

public?static?List?activityList=new?ArrayList<>();

public?static?void?addActivity(Activity?activity){

activityList.add(activity);

}

public?static?void?remove(Activity?activity){

activityList.remove(activity);

}

public?static?void?finishAll(){

for?(Activity?activity:activityList){

if?(!activity.isFinishing()){??//判斷activity是否銷毀

activity.finish();???//銷毀activity

}

}

}

}

2、BaseActivity??作為后面activity的父類，繼承自AppComapActivity

package?com.yuanlp.forceexit;

import?android.content.BroadcastReceiver;

import?android.content.Context;

import?android.content.DialogInterface;

import?android.content.Intent;

import?android.content.IntentFilter;

import?android.os.Bundle;

import?android.support.v7.app.AlertDialog;

import?android.support.v7.app.AppCompatActivity;

/**

*?Created?by?原立鵬?on?2017/6/28.

*/

public?class?BaseActivity??extends?AppCompatActivity{

private?MyForceExitReceiver?receiver;??//聲明一個自己的廣播接收者內部類

@Override

protected?void?onCreate(Bundle?savedInstanceState)?{

super.onCreate(savedInstanceState);

ActivityCollector.addActivity(this);

}

/**

*?在activity處于返回棧頂，即處于焦點時，注冊一個廣播接收者

*/

public?void?onResume(){

super.onResume();

IntentFilter?intentFilter=new?IntentFilter();??//實例化一個intent過濾器

intentFilter.addAction("com.yuanlp.exit.FORCEXIT");??//只關心自己想要的廣播

receiver=new?MyForceExitReceiver();

registerReceiver(receiver,intentFilter);??//動態注冊廣播

}

public?void?onPause(){??//當當前activity被彈出框占用時，解除注冊

super.onPause();

if?(receiver!=null){

unregisterReceiver(receiver);

receiver=null;

}

}

public?void?onDestroy(){

super.onDestroy();

ActivityCollector.finishAll();

}

/**

*?一個廣播接收者,接收到廣播后，彈出框提示用戶重新登錄，強制退出

*/

private?class?MyForceExitReceiver?extends?BroadcastReceiver{

@Override

public?void?onReceive(final?Context?context,?final?Intent?intent)?{

AlertDialog.Builder?builder=new?AlertDialog.Builder(context);

builder.setTitle("warning");

builder.setMessage("你被強制退出，請重新登錄");

builder.setCancelable(false);??//禁止用戶取消這個彈框

builder.setPositiveButton("OK",?new?DialogInterface.OnClickListener()?{

@Override

public?void?onClick(DialogInterface?dialog,?int?which)?{

ActivityCollector.finishAll();???//銷毀所有活動

Intent?intent=new?Intent(context,LoginActivity.class);?//跳轉至登錄界面

context.startActivity(intent);

}

});

builder.show();

}

}

}

3、LoginActivity ? 登錄成功后，跳轉到MainActivity界面。這里要在AndroidManifext.xml設置為這個activity是launcher,即打開后的第一個界面package?com.yuanlp.forceexit;

import?android.content.Intent;

import?android.os.Bundle;

import?android.view.View;

import?android.widget.EditText;

public?class?LoginActivity?extends?BaseActivity?{

private?EditText?mName;

private?EditText?mPassword;

@Override

protected?void?onCreate(Bundle?savedInstanceState)?{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_login);

mName?=?(EditText)?findViewById(R.id.et_name);

mPassword?=?(EditText)?findViewById(R.id.et_password);

}

public?void?login(View?view){

String?name=mName.getText().toString().trim();

String?password=mPassword.getText().toString().trim();

if?("admin".equals(name)&&"123456".equals(password)){

Intent?intent=new?Intent(this,MainActivity.class);

startActivity(intent);

}

}

}

4、activity_login.xml ?簡單的一個LinearLayout,vertical排版，里面放了2個水平布局的LinearLayout,分別放一個用戶名和密碼的EditText。最下方一個button，實現登錄方法<?xml ?version="1.0"?encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context="com.yuanlp.forceexit.LoginActivity">

android:layout_width="match_parent"

android:layout_height="60dp"

android:orientation="horizontal">

android:id="@+id/et_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:ems="10"

android:hint="賬號"

android:inputType="textPersonName"/>

android:layout_width="match_parent"

android:layout_height="60dp"

android:orientation="horizontal">

android:id="@+id/et_password"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:ems="10"

android:hint="密碼"

android:inputType="textPersonName"/>

android:id="@+id/button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:onClick="login"

android:text="Button"/>

5、MainActivity

里面主要的是一個button的方法，實現發送廣播。package?com.yuanlp.forceexit;

import?android.content.Intent;

import?android.os.Bundle;

import?android.view.View;

public?class?MainActivity?extends?BaseActivity?{

@Override

protected?void?onCreate(Bundle?savedInstanceState)?{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public?void?exit(View?view){

Intent?intent=new?Intent("com.yuanlp.exit.FORCEXIT");

sendBroadcast(intent);??//發送廣播

}

}

6、activity_main.xml<?xml ?version="1.0"?encoding="utf-8"?>

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.yuanlp.forceexit.MainActivity">

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="exit"

android:text="強制退出"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintTop_toTopOf="parent"

tools:layout_editor_absoluteX="126dp"/>

總結

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