如何在 oncheckedchange 中停止线程

Question

好吧，当我按下切换按钮到ON时，我可以启动线程并且它工作正常，该线程用于启动录音和音轨。但是当我关闭切换按钮时，我无法停止线程......因为我不能做线程停止...我想做的只是停止录音和录音带......如果有任何方法可以在没有制作线程的情况下启动/停止它们也可以。另外，由于我无法停止线程，因此当我切换按钮开 - 关 - 开时，它会出错，因为无法启动线程 2 次。

Answer 1

Thread

的stop()方法已被弃用（因为它本质上不安全），Java 提供了一种停止 Thread 的替代方法。这是一种非常简单的方法，如以下官方链接中所述：

http://docs.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

您是否尝试将isRecording变量设置为全局变量，然后更改其状态：

 isRecording = false;
 Thread thread;
 Runnable r = new Runnable() {
public void run() {
    isRecording = true;
    android.os.Process
            .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
    int buffersize = AudioRecord.getMinBufferSize(8000,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, buffersize);
    int bufferzize = AudioTrack.getMinBufferSize(11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, bufferzize,
            AudioTrack.MODE_STREAM);
    atrack.setPlaybackRate(11025);
    byte[] buffer = new byte[buffersize];
    if (arec.getState() == AudioRecord.STATE_INITIALIZED)
        arec.startRecording();
    if (atrack.getState() == AudioTrack.STATE_INITIALIZED)
        atrack.play();
    while (isRecording) {
        arec.read(buffer, 0, buffersize);
        atrack.write(buffer, 0, buffer.length);
    }
}
};
tbs = (ToggleButton) findViewById(R.id.tbS);
tbs.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
        // TODO Auto-generated method stub
        if (isChecked) {
            thread = new Thread(r)
            thread.start();
            } else {
          isRecording = false;
          thread = null;
        }
    }
});

Answer 2

也许您可以使用一个变量并检查函数是否运行其状态，如下所示：

   tbs = (ToggleButton) findViewById(R.id.tbS);
   boolean stopThread = false;
    tbs.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
        // TODO Auto-generated method stub
        if (isChecked) {
            thread.start();
            } else {
          stopThread = true;
        }
    }
});
      Thread thread = new Thread() {
public void run() {
    isRecording = true;
    android.os.Process
            .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
    int buffersize = AudioRecord.getMinBufferSize(8000,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, buffersize);
    int bufferzize = AudioTrack.getMinBufferSize(11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, bufferzize,
            AudioTrack.MODE_STREAM);
    atrack.setPlaybackRate(11025);
    byte[] buffer = new byte[buffersize];
    if (arec.getState() == AudioRecord.STATE_INITIALIZED)
        arec.startRecording();
    if (atrack.getState() == AudioTrack.STATE_INITIALIZED)
        atrack.play();
    while (isRecording) {
        arec.read(buffer, 0, buffersize);
        atrack.write(buffer, 0, buffer.length);
    }
    if(stopThread)
        return;
}
};

Answer 3

在这种情况下，我更喜欢处理程序。

它们有两个特点

Handler audioHandler = new Handler();
audioHandler.post(startAudio);   // Starts the operations
audioHandler.removeCallbacks(startAudio); //Stops the Operation

以下代码片段将为您提供帮助。

package org.sample;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Handler;
import android.widget.CompoundButton;
import android.widget.ToggleButton;
public class SampleActivity extends Activity {
    private Handler audioHandler;
    private Runnable startAudio;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        audioHandler = new Handler();
        startAudio = new Runnable() {
            @Override
            public void run() {
                isRecording = true;
                android.os.Process
                        .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
                int buffersize = AudioRecord.getMinBufferSize(8000,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT);
                arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT, buffersize);
                int bufferzize = AudioTrack.getMinBufferSize(11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT);
                atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT, bufferzize,
                        AudioTrack.MODE_STREAM);
                atrack.setPlaybackRate(11025);
                byte[] buffer = new byte[buffersize];
                if (arec.getState() == AudioRecord.STATE_INITIALIZED)
                    arec.startRecording();
                if (atrack.getState() == AudioTrack.STATE_INITIALIZED)
                    atrack.play();
                while (isRecording) {
                    arec.read(buffer, 0, buffersize);
                    atrack.write(buffer, 0, buffer.length);
                }
                audioHandler.post(startAudio);
            }
        };
        tbs = (ToggleButton) findViewById(R.id.tbS);
        tbs.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if (isChecked) {
                    audioHandler.post(startAudio);
                } else {
                    audioHandler.removeCallbacks(startAudio);
                }
            }
        });
    }
}

Answer 4

只要

isRecording true线程就处于活动状态。因此，您可以拥有一个final StringBuilder，可以根据需要操纵isRecording的值。

  final StringBuilder isRecording=new StringBuilder("t");
Thread thread = new Thread() {
            public void run() {
                android.os.Process
                        .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
                int buffersize = AudioRecord.getMinBufferSize(8000,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT);
                arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT, buffersize);
                int bufferzize = AudioTrack.getMinBufferSize(11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT);
                atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025,
                        AudioFormat.CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT, bufferzize,
                        AudioTrack.MODE_STREAM);
                atrack.setPlaybackRate(11025);
                byte[] buffer = new byte[buffersize];
                if (arec.getState() == AudioRecord.STATE_INITIALIZED)
                    arec.startRecording();
                if (atrack.getState() == AudioTrack.STATE_INITIALIZED)
                    atrack.play();
                while (isRecording.toString().equals("t")) {
                    arec.read(buffer, 0, buffersize);
                    atrack.write(buffer, 0, buffer.length);
                }
            }
        };
    tbs = (ToggleButton) findViewById(R.id.tbS);
        tbs.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if (isChecked) {
                    isRecording.replace(0,0,"t");
                    thread.start();
                    } else {
                isRecording.replace(0,0,"f")
                }
            }
        });