广播接收者 BroadcastReceiver 示例-2

BaseActivity

/**所有Activity的基类*/
public class BaseActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ActivityCollector.removeActivity(this);
    }

}

MainActivity

public class MainActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i("MainActivity", "++++++onCreate");
        TextView textView = new TextView(this);
        textView.setGravity(Gravity.CENTER);
        textView.setText("请登录");
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, SecondActivity.class));
            }
        });
        setContentView(textView);
    }

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

    @Override
    public void finish() {
        super.finish();
        Log.i("MainActivity", "++++++finish");
    }

}

SecondActivity

public class SecondActivity extends BaseActivity {
    private MyLocalReceiver localReceiver;
    //本地广播的管理器，该机制发出的广播只会在APP内部传播，且广播接收者也只能收到本APP发出的广播！本地广播无法通过静态方式注册，相比起系统全局广播更加高效
    private LocalBroadcastManager localBroadcastManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView textView = new TextView(this);
        textView.setText("发送本地广播");
        textView.setGravity(Gravity.CENTER);
        setContentView(textView);

        localReceiver = new MyLocalReceiver();
        IntentFilter intentFilter = new IntentFilter(MyActions.MY_BROADCAST_ACTION_LOGIN_OTHER);//可以通过addAction()方法添加多个Action
        localBroadcastManager = LocalBroadcastManager.getInstance(this);
        localBroadcastManager.registerReceiver(localReceiver, intentFilter);//注册广播接收者，设置过滤器

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                localBroadcastManager.sendBroadcast(new Intent(MyActions.MY_BROADCAST_ACTION_LOGIN_OTHER));
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        localBroadcastManager.unregisterReceiver(localReceiver);
        Log.i("SecondActivity", "++++++onDestroy");
    }

    @Override
    public void finish() {
        super.finish();
        Log.i("SecondActivity", "++++++finish");
    }

}

Activity管理类

/** 一个用于在应用退出时关闭所有Activity的容器管理类 */
public class ActivityCollector {
    private static List<Activity> activities = new ArrayList<Activity>();

    public static void addActivity(Activity activity) {
        activities.add(activity);
    }

    public static void removeActivity(Activity activity) {
        activities.remove(activity);
    }

    public static void finishAll() {
        for (Activity activity : activities) {
            if (!activity.isFinishing()) {
                activity.finish();
            }
        }
    }

}

自定义的Action

public class MyActions {
    public static final String MY_BROADCAST_ACTION_UNORDERED = "com.bqt.broadcast.songwennuan_unordered";
    public static final String MY_BROADCAST_ACTION_ORDERED = "com.bqt.broadcast.songwennuan_ordered";
    public static final String MY_BROADCAST_ACTION_LOGIN_OTHER = "com.bqt.broadcast.local_login_other";
}

一级广播接收者

public class Level1Receiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_ORDERED)) {//如果是无序广播，执行setResultData、abortBroadcast会报错！
            System.out.println("Level1消息：" + getResultData());
            setResultData("给农民兄弟发5000块钱");//更改接收到的广播内容，发给低优先级的应用
            abortBroadcast();//阻止广播，但是不能阻止FinalReceiver接收广播，但能更改广播内容之后再发给他。放在setResultData前后都可以。
        } else if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_UNORDERED)) {
            System.out.println("Level1消息：" + intent.getStringExtra("msg"));
        }
    }

}

二级广播接收者

public class Level2Receiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_ORDERED)) {
            System.out.println("Level2消息：" + getResultData());
            setResultData("给农民兄弟发2000块钱");//更改接收到的广播内容，发给低优先级的应用
        } else if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_UNORDERED)) {
            System.out.println("Level2消息：" + intent.getStringExtra("msg"));
        }
    }

}

最终广播接收者

public class FinalReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_ORDERED)) {
            System.out.println("Final消息：" + getResultData());
        } else if (intent.getAction().equals(MyActions.MY_BROADCAST_ACTION_UNORDERED)) {
            System.out.println("Final消息：" + intent.getStringExtra("msg"));
        }
    }

}

本地广播

/** 接收到本地广播后弹出对话框，关闭所有Activity，并调到MainActivity */
public class MyLocalReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
        AlertDialog alertDialog = new AlertDialog.Builder(context).setTitle("警告：").setMessage("您的账号在别处登录，请重新登陆~").setCancelable(false)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCollector.finishAll();
                        Intent intent = new Intent(context, MainActivity.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//广播中启动Activity需要设置此flag，因为Activity需要一个栈
                        context.startActivity(intent);
                    }
                }).create();
        alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); //系统对话框权限：SYSTEM_ALERT_WINDOW
        alertDialog.show();
    }

}

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bqt.broadcast"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="21" />
    <!-- 系统对话框权限 -->
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity" />

        <!-- —————————————————————自定义广播————————————————————— -->
        <!-- 本地广播 -->
        <receiver android:name=".myreceiver.MyLocalReceiver" >
            <intent-filter>
                <action android:name="com.bqt.broadcast.local_login_other" />
            </intent-filter>
        </receiver>
        <!-- 无序广播和有序广播 -->
        <receiver android:name=".myreceiver.Level1Receiver" >
            <intent-filter android:priority="1000" >
                <action android:name="com.bqt.broadcast.songwennuan_unordered" />
                <action android:name="com.bqt.broadcast.songwennuan_ordered" />
            </intent-filter>
        </receiver>
        <receiver android:name=".myreceiver.Level2Receiver" >
            <intent-filter android:priority="500" >
                <action android:name="com.bqt.broadcast.songwennuan_unordered" />
                <action android:name="com.bqt.broadcast.songwennuan_ordered" />
            </intent-filter>
        </receiver>
        <receiver android:name=".myreceiver.FinalReceiver" >
            <intent-filter android:priority="10" >
                <action android:name="com.bqt.broadcast.songwennuan_unordered" />
                <action android:name="com.bqt.broadcast.songwennuan_ordered" />
            </intent-filter>
        </receiver>
    </application>


</manifest>

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