Question

我想在AudioRecord循环中进行一些处理，然后在录制循环中设置一些参数。但我无法启动处理线程。

在UI线程中，我启动了设置AudioRecord实例的AsyncTask：

new AsyncTask<Void, Void, Exception>() {
    @Override
    protected Exception doInBackground(Void... params) {
        setupAnalyzer();
    }
}.execute();

在setupAnalyzer（）方法中，我设置了一个记录器线程和一个处理线程：

private RecognizerThread recognizerThread;
private final Handler voiceProcessingHandler = new Handler();
private HandlerThread voiceProcessingHandlerThread = new HandlerThread("handler");

//the processing handler
private final Handler mainHandler = new Handler(voiceProcessingHandlerThread.getLooper(), new Handler.Callback() {
    @Override
    public boolean handleMessage(Message msg) {
        //do heavy processing 
        recognizerThread.getNewParamtersAfterFrameProcessed(msg.arg1);
    return true;
    }
});

the audio recorder thread
private final class RecognizerThread extends Thread {
      int value;

    //this method is then called from within processing thread when done
    public void getNewParamtersAfterFrameProcessed(int nread) {
         value = nread;
    }

    @Override
    public void run() {
    //the audio recording runnable
    }
}

...
// start the threads
recognizerThread = new RecognizerThread();
recognizerThread.start();

voiceProcessingHandlerThread.start();

但我收到错误：

java.lang.RuntimeException：执行时发生错误 doInBackground（）引起：java.lang.RuntimeException：无法创建未调用Looper.prepare（）
的线程内部处理程序

如何在继续录制音频的同时在新线程中执行一些繁重的处理，然后在处理完成后将值返回到录制器线程？

在AsyncTask中创建HandlerThread

0 个答案: