在Nexus 7棉花糖上初始化AudioRecorder

我有一个程序已经在六个测试设备上成功运行,数百名显然很高兴的用户从Google Play下载了我的应用程序。

我买了一台用过的Nexus 7,已经升级为棉花糖,我无法录制。该设备可以运行其他录音应用程序,但无法运行我的应用程序。

下面是一些代码:

private static AudioRecord recorder = null;

public static void record() throws IllegalArgumentException
{
    int channelConfig = AudioFormat.CHANNEL_IN_MONO;
    int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
    int sampleRate = 44100;
    int minSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat );
    int latencySize = 3584;
    int inputBufferSize = Math.max( minSize, latencySize );
    recorder = new AudioRecord( MediaRecorder.AudioSource.DEFAULT, sampleRate, channelConfig, audioFormat, inputBufferSize );
    int state = recorder.getState();
    if ( state != AudioRecord.STATE_INITIALIZED )
    {
        if ( recorder != null )
            recorder.release();
        recorder = null;
        throw new IllegalArgumentException( "Failed to initialize Audio recorder.  State = " + state );
    }
    recorder.startRecording();
    Thread inputThread = new Thread( new Runnable() { public void run() { inputTask(); } }, "Input" );
    inputThread.setPriority( Thread.MAX_PRIORITY );
    inputThread.start();
}

这将失败,状态0与 STATE_UNINITIALIZED .

我的AndroidManifest。xml包括

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

正如我所说,这段代码在数百台其他机器上成功运行,但在我的Nexus 7上却失败了?我应该怀疑我的硬件有故障吗?发生什么事?