广播接收者 BroadcastReceiver 示例-2

/**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);
    }
}

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");
    }
}

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");
    }
}

/** 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();
            }
        }
    }
}

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";
}

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"));
        }
    }
}

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"));
        }
    }
}

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"));
        }
    }
}