Android（Broadcast实现强制下线功能）

来源：互联网发布：暴雪游戏平台mac 编辑：程序博客网时间：2024/05/18 06:23

1、效果图：
这里写图片描述

2、文件：

3、ActivityCollector.java

package com.example.jcs.mybroadcastreceiverdemo;import android.app.Activity;import java.util.ArrayList;import java.util.List;//定义一个类来管理所有活动public class ActivityCollector {    public static List<Activity> list = new ArrayList<Activity>();    public static void addActivity(Activity activity) {        list.add(activity);    }    public static void removeActivity(Activity activity) {        list.remove(activity);    }    public static void finishAll() {        for (Activity a : list) {            //遍历集合是否到最后一个            if (!a.isFinishing()) {                a.finish();            }        }    }}

4、Base.java

package com.example.jcs.mybroadcastreceiverdemo;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;public class Base extends AppCompatActivity {    private Receiver receiver;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //把当前的页面加到集合中        ActivityCollector.addActivity(this);    }    @Override    protected void onResume() {        super.onResume();        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction("com.example.jcs.mybroadcastreceiverdemo.FORCE_OFFLINE");        receiver = new Receiver();        registerReceiver(receiver, intentFilter);    }    @Override    protected void onPause() {        super.onPause();        //判断对象是否为空        if (receiver != null) {            unregisterReceiver(receiver);            receiver = null;        }    }    @Override    protected void onDestroy() {        super.onDestroy();        ActivityCollector.removeActivity(this);    }    //增加一个广播接收器    class Receiver extends BroadcastReceiver {        @Override        public void onReceive(final Context context, Intent intent) {            //对话框            AlertDialog.Builder dialog = new AlertDialog.Builder(context);            dialog.setTitle("警告");            dialog.setMessage("应用强制下线！");            dialog.setCancelable(false);            dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialogInterface, int i) {                    //移除所有的页面                    ActivityCollector.finishAll();                    //在转到login                    Intent intent = new Intent(context,Login.class);                    context.startActivity(intent);                }            });            //PS:一定要show();            dialog.show();        }    }}

5、Login.java

package com.example.jcs.mybroadcastreceiverdemo;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;/** * Created by JCS on 2017/6/27. */public class Login extends Base {    private EditText user_name;    private EditText password;    private Button btn;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.login_activity);        user_name = (EditText) findViewById(R.id.user);        password = (EditText) findViewById(R.id.password);        btn = (Button) findViewById(R.id.login_btn);        btn.setOnClickListener(new View.OnClickListener() {            public void onClick(View view) {                String name = user_name.getText().toString().trim();                String pass = password.getText().toString().trim();                //判断账号密码                if (name.equals("admin") && pass.equals("123")) {                    Intent intent = new Intent(Login.this, MainActivity.class);                    startActivity(intent);                    finish();                } else {                    Toast.makeText(Login.this, "error", Toast.LENGTH_SHORT).show();                }            }        });    }}

6、MainActivity.java

package com.example.jcs.mybroadcastreceiverdemo;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends Base {    private Button btn;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn = (Button) findViewById(R.id.send_broadcast);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //点击就发送广播                Intent intent = new Intent("com.example.jcs.mybroadcastreceiverdemo.FORCE_OFFLINE");                sendBroadcast(intent);            }        });    }}

7、activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.jcs.mybroadcastreceiverdemo.MainActivity">  <Button      android:id="@+id/send_broadcast"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="发送广播"      /></RelativeLayout>

8、login_activity.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="账号："            />        <EditText            android:id="@+id/user"            android:layout_width="match_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="账号："            />        <EditText            android:id="@+id/password"            android:layout_width="match_parent"            android:layout_height="wrap_content" />    </LinearLayout>    <Button        android:id="@+id/login_btn"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="登录"        /></LinearLayout>

9、清单文件：（把login为启动页面）

<application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity"></activity>        <activity android:name=".Login">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>

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