Possible Duplicate:
Stop Recording and Context
我不明白怎么了？!!!
当电话铃响起时，录制开始。
但是当调用结束时，我得到NullPointerException，因为MediRecorder为null，但是直到我关闭窗口并出现错误之前，记录仍在进行。
我的问题与此Sound Recorder Widget doesnt stop recording相同
public class Call extends BroadcastReceiver
{
private MediaRecorder mRecorder;
public void onReceive(Context context, Intent intent)
{
Bundle bundle = intent.getExtras();
if(null == bundle) return;
String state = bundle.getString(TelephonyManager.EXTRA_STATE);
if(state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING))
{
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile("/sdcard/Record.3gp";);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {mRecorder.prepare();}
catch (IOException e){}
mRecorder.start();
// if I stop recording here, then everything is fine
/*
try
{Thread.sleep(300000);}
catch (InterruptedException e)
{e.printStackTrace();}
mRecorder.stop();
mRecorder.release();
mRecorder = null;
*/
}
if(state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE))
{
if(mRecorder != null) // But this always false. if I remove this condition -
{
mRecorder.stop(); // - then here NullPointerException
mRecorder.release();
mRecorder = null;
}
}
}
}
LogCat：
10-01 07:13:28.054: ERROR/AndroidRuntime(553): Uncaught handler: thread main exiting due to uncaught exception
10-01 07:13:29.134: ERROR/AndroidRuntime(553): java.lang.RuntimeException: Unable to start receiver xxx.xxx.xxx.Call: java.lang.NullPointerException
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2646)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.app.ActivityThread.access$3100(ActivityThread.java:119)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1913)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.os.Handler.dispatchMessage(Handler.java:99)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.os.Looper.loop(Looper.java:123)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.app.ActivityThread.main(ActivityThread.java:4363)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at java.lang.reflect.Method.invokeNative(Native Method)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at java.lang.reflect.Method.invoke(Method.java:521)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at dalvik.system.NativeStart.main(Native Method)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): Caused by: java.lang.NullPointerException
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at xxx.xxx.xxx.Call.onReceive(Call.java:49)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2637)
10-01 07:13:29.134: ERROR/AndroidRuntime(553): ... 10 more
10-01 07:13:33.184: ERROR/audio_input(31): unsupported parameter: x-pvmf/media-input-node/cap-config-interface;valtype=key_specific_value
10-01 07:13:33.184: ERROR/audio_input(31): VerifyAndSetParameter failed
最佳答案
您正在使用与类MediaRecorder对象相同的名称在“电话正在响铃”语句中声明MediaRecorder对象的新实例，一旦离开该if语句的范围，该实例就会丢失。只需删除MediaRecorder行前面的MediaRecorder mRecorder = new MediaRecorder();声明，就可以了。
关于android - 无法停止录制？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7627327/