Android 录音时发生异常

我正在创建一个录音应用程序。我需要录制音频并将其存储在SD中
卡片但当我尝试运行应用程序时，它运行正常，但当我按下停止按钮时，它会显示消息“不幸的是，您的应用程序已停止”
这是logcat

enter code here  
08-01 12:09:18.331: E/SoundRecordingActivity(5611): sdcard access error
08-01 12:09:21.043: D/AndroidRuntime(5611): Shutting down VM
08-01 12:09:21.043: W/dalvikvm(5611): threadid=1: thread exiting with uncaught exception (group=0x2c3381f8)
08-01 12:09:21.043: E/AndroidRuntime(5611): FATAL EXCEPTION: main
08-01 12:09:21.043: E/AndroidRuntime(5611): java.lang.NullPointerException
08-01 12:09:21.043: E/AndroidRuntime(5611):     at com.blitze.recordingapp.SoundRecordingActivity$2.onClick(SoundRecordingActivity.java:110)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.view.View.performClick(View.java:3511)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.view.View$PerformClick.run(View.java:14115)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.os.Handler.handleCallback(Handler.java:605)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.os.Looper.loop(Looper.java:137)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at android.app.ActivityThread.main(ActivityThread.java:4424)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at java.lang.reflect.Method.invokeNative(Native Method)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at java.lang.reflect.Method.invoke(Method.java:511)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-01 12:09:21.043: E/AndroidRuntime(5611):     at dalvik.system.NativeStart.main(Native Method)
08-01 12:09:23.759: W/System.err(5611): java.lang.Throwable: stack dump
08-01 12:09:23.759: W/System.err(5611):     at java.lang.Thread.dumpStack(Thread.java:496)
08-01 12:09:23.759: W/System.err(5611):     at android.os.Process.killProcess(Process.java:725)
08-01 12:09:23.759: W/System.err(5611):     at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:82)
08-01 12:09:23.759: W/System.err(5611):     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
08-01 12:09:23.759: W/System.err(5611):     at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
08-01 12:09:23.759: W/System.err(5611):     at dalvik.system.NativeStart.main(Native Method)  

这是我的密码

startButton.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            startButton.setEnabled(false);
            stopButton.setEnabled(true);

            File sampleDir = Environment.getExternalStorageDirectory();
            try {
                audiofile = File.createTempFile("sound", ".3gp", sampleDir);

            recorder = new MediaRecorder();
            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            recorder.setOutputFile(audiofile.getAbsolutePath());
            recorder.prepare();
            recorder.start();




            } catch (IOException e) {
                Log.e(TAG, "sdcard access error");
                return;
            }



        }
    });
    stopButton.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            startButton.setEnabled(true);
            stopButton.setEnabled(false);
            recorder.stop();
            recorder.release();

            //counter.cancel();
            addRecordingToMediaLibrary();

        }
    });

protected void addRecordingToMediaLibrary() {
    ContentValues values = new ContentValues(4);
    long current = System.currentTimeMillis();
    values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
    values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
    values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
    values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
    ContentResolver contentResolver = getContentResolver();

    Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Uri newUri = contentResolver.insert(base, values);

    sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
    Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show();
}

}

我把SD卡连接到手机上。 我不明白是什么问题。给我任何提示或参考。

---

谢谢。

您需要查看第110行，这是OnClick函数中的一行。您将引用类似“recorder.stop（）”的内容，此时recorder将为NULL

---

看起来您需要将在开始函数中创建的记录器对象的实例传递到停止函数中。

您在清单中是否具有SD卡写入权限？日志的第一行似乎显示“sd卡访问错误”？