运行在单独的线程上广播接收器

Question

我有一个在进程的主线程上运行的 class。我想在此 class 中实现广播接收器，它在单独的线程上运行。

我通过制作内部 class 扩展线程并在此内部 class 中初始化处理程序来尝试此操作，我可以将其提供给 registerReceiver（BroadcastReceiver 接收器，IntentFilter 过滤器，String broadcastPermission，Handler scheduler ) 用于在此处理程序上执行广播接收器（附加到新创建的线程）。但徒劳无功。日志显示正在主线程上调用 onReceive。

请帮忙。（我看过一些关于如何使用 registerReceiver(BroadcastReceiver receiver, IntentFilter filter, String broadcastPermission, Handler scheduler) 的帖子，但没有任何帮助）。

Answer 1

我建议您应该使用 HandlerThread 而不是子类化 Thread

例如

HandlerThread handlerThread = new HandlerThread("DifferentThread" , android.os.Process.THREAD_PRIORITY_BACKGROUND);
handlerThread.start();
Looper looper = handlerThread.getLooper();
private Handler handler = new Handler(looper, this);
// Register the broadcast receiver to run on the separate Thread
registerReceiver (myReceiver, intentFilter, broadcastPermission, handler);

希望这对您的实验有所帮助 ;)

开心！

Answer 2

使用HandlerThread 时，请务必在注销BroadcastReceiver 后退出线程。否则，文件描述符 (FD) 泄漏会发生在 Linux 级别，如果继续注册/取消注册，应用程序最终会崩溃。

unregisterReceiver(...);

然后
looper.quit();
或者
looper.quit安全();

private Handler broadcastReceiverHandler = null;
private HandlerThread broadcastReceiverThread = null;
private Looper broadcastReceiverThreadLooper = null;

private BroadcastReceiver broadcastReceiverReadScans = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

    }
}

private void registerForIntents() {
    broadcastReceiverThread = new HandlerThread("THREAD_NAME");//Create a thread for BroadcastReceiver
    broadcastReceiverThread.start();

    broadcastReceiverThreadLooper = broadcastReceiverThread.getLooper();
    broadcastReceiverHandler = new Handler(broadcastReceiverThreadLooper);

    IntentFilter filterScanReads = new IntentFilter();
    filterScanReads.addAction("ACTION_SCAN_READ");
    filterScanReads.addCategory("CATEGORY_SCAN");

    context.registerReceiver(broadcastReceiverReadScans, filterScanReads, null, broadcastReceiverHandler);
}

private void unregisterIntents() {
    context.unregisterReceiver(broadcastReceiverReadScans);
    broadcastReceiverThreadLooper.quit();//Don't forget
}

Answer 3

我已经分叉 LocalBroadcastReceiver 以便能够在任意 java 线程上接收广播。

对我有用。我向

添加了一个 Looper 参数

public void registerReceiver(Context act, IntentFilter filt, Looper looper)

如果looper为null，则使用主线程looper。

代码在这里：

https://github.com/sorenoid/LocalBroadcastManager/blob/master/LocalBroadcastManager.java

运行在单独的线程上广播接收器

Running broadcast receiver on a separate thread

multithreading

android

运行 在单独的线程上广播接收器

Running broadcast receiver on a separate thread

multithreading

android

运行在单独的线程上广播接收器