java Android AudioRecord无法初始化（其他解决方案不起作用）

Question

今天我已经检查并尝试了所有其他线程好几个小时了，但没有一个解决方案有效

我尝试过过滤所有可用的音频选项。我已授予该应用程序适当的权限

目标：我正在尝试获取此音频流，以便获得音频的频率

我的东西

public int audioSource = MediaRecorder.AudioSource.MIC;
public int channelConfig = AudioFormat.CHANNEL_IN_MONO;
public int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
public AudioRecord audioRecord = null;
private Thread recordingThread = null;
public int blockSize = 256;                               // deal with this many samples at a time
public int sampleRate = 8000;                             // Sample rate in Hz

后来

 int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioEncoding);
    AudioRecord audioeeeeRecord = new AudioRecord(audioSource, sampleRate, channelConfig, audioEncoding, bufferSize);   // The RAW PCM sample recording
    audioRecord = audioeeeeRecord;
    if (audioRecord != null && audioRecord.getState() != AudioRecord.STATE_INITIALIZED)
        try {
            throw new Exception("AudioRecord init failed");                    //audioRecord = findAudioRecord();
        } catch (Exception e) {
            e.printStackTrace();
        }
    final short[] buffer = new short[blockSize];

    try {

        audioRecord.startRecording();
    } catch (Exception e) {
        e.printStackTrace();
    }

这会引发以下错误（http://pastebin.com/raw/3wmA4cku）：

AudioRecord: AudioFlinger could not create record track, status: -1
         E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -1.
         E/安卓.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
         W/System.err: java.lang.Exception: AudioRecord init failed
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:102)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at 安卓.view.View.performClick(View.java:5697)
         W/System.err:     at 安卓.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at 安卓.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at 安卓.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at 安卓.os.Looper.loop(Looper.java:158)
         W/System.err:     at 安卓.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
         W/System.err: java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
         W/System.err:     at 安卓.media.AudioRecord.startRecording(AudioRecord.java:943)
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:114)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at 安卓.view.View.performClick(View.java:5697)
         W/System.err:     at 安卓.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at 安卓.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at 安卓.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at 安卓.os.Looper.loop(Looper.java:158)
         W/System.err:     at 安卓.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

这就是答案。这不是android所拥有的东西，这是愚蠢的

https://stackoverflow.com/a/33769527/6530367 I know this is a very old question but in Android Marshmallow you have to go on "Settings > Apps > Your App > Permissions" and enble Microphone permission.

Answer 2

我认为问题可能是，您以前尝试过将音频资源绑定起来，然后得到了正确的代码，但现在它无法工作，因为没有可用的音频资源。见this SO question。另外，当构造函数返回未初始化的音频记录时，您正在抛出一个异常，但您捕获了自己的异常，这将导致第二个异常（…在未初始化的音频记录上调用…）在日志中可以忽略，因为它是第一次操作的结果

您可能需要在活动中加入一些try/finally部分和/或OnDestroy和/或OnPause方法，以确保录音在不再使用时发布

一旦清除代码就绪，您可能需要关闭应用程序和/或重新启动手机以释放音频资源

当然，你可能让另一个应用程序保持运行，但我对此表示怀疑

Answer 3

步骤1）检查您的清单，以确保在“应用程序”部分下添加录制\u音频权限。e、 g

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.colibri.audioloopback">

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

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

    <uses-permission android:name="android.permission.RECORD_AUDIO" />

</manifest>

步骤2）如果您的设备为M或更高版本，则需要通过设置授予权限->；应用程序->；您的应用程序->；权限

步骤3）如果仍然不起作用，请参阅下面的代码段

   public void audioRecordLoop() throws Exception {
        Log.e(TAG,"start audioRecordLoop");
        int channelConfig = mChannels == 2?
                AudioFormat.CHANNEL_IN_STEREO:
                AudioFormat.CHANNEL_IN_MONO;
        int bufferSize = AudioRecord.getMinBufferSize(
                mSampleRateHz, channelConfig, mAudioEncoding);
        mAudioRecord = new AudioRecord(
                mAudioSource, mSampleRateHz, channelConfig, mAudioEncoding, bufferSize);// The RAW PCM sample recording

        if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
            Log.e(TAG,"AudioRecord init failed");
            return;
        }
        final short[] buffer = new short[mBlockSize];
        mAudioRecord.startRecording();
        int len = 0;
        while (mbExit == false) {
            len = mAudioRecord.read(buffer, 0, mBlockSize);
            if (len < 0) {
                Log.e(TAG,"read error " + len);
                return;
            }
        }
        mAudioRecord.stop();
        mAudioRecord.release();
    }

现在应该可以了