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我正在進行通話錄音應用程序。我的問題是，收到電話時錄音工作正常，但不會停止錄音。下面是我的代碼和logcat。任何形式的幫助非常感謝。使用mediaRecorder錄製時爲空例外
我的代碼：
public class IncomingCallReceiver extends BroadcastReceiver {
private MediaRecorder mRecorder;
@Override
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))
{
}
else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK)){
Log.i("TelephonyManager", "Call picked up");
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mRecorder.setAudioEncodingBitRate(16);
mRecorder.setAudioSamplingRate(44100);
mRecorder.setOutputFile("/sdcard/Recording/callrecord.mp4");
try{
mRecorder.prepare();
}
catch(IOException e){
}
mRecorder.start();
Log.i("StartRecordingCall", "Recording Call end");
}
else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)){
Log.i("TelephonyManager", "Call hunged up");
mRecorder.stop();
mRecorder.release();
mRecorder=null;
}
}
} logcat的
12-11 22:53:51.502: E/MediaRecorder(2831): stop called in an invalid state: 1
12-11 22:53:51.502: D/AndroidRuntime(2831): Shutting down VM
12-11 22:53:51.502: W/dalvikvm(2831): threadid=1: thread exiting with uncaught exception (group=0x2b544300)
12-11 22:53:51.502: E/AndroidRuntime(2831): FATAL EXCEPTION: main
12-11 22:53:51.502: E/AndroidRuntime(2831): java.lang.RuntimeException: Unable to start receiver com.example.callrecorder.IncomingCallReceiver: java.lang.IllegalStateException
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2362)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.app.ActivityThread.access$1500(ActivityThread.java:142)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.os.Handler.dispatchMessage(Handler.java:99)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.os.Looper.loop(Looper.java:137)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.app.ActivityThread.main(ActivityThread.java:4931)
12-11 22:53:51.502: E/AndroidRuntime(2831): at java.lang.reflect.Method.invokeNative(Native Method)
12-11 22:53:51.502: E/AndroidRuntime(2831): at java.lang.reflect.Method.invoke(Method.java:511)
12-11 22:53:51.502: E/AndroidRuntime(2831): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
12-11 22:53:51.502: E/AndroidRuntime(2831): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
12-11 22:53:51.502: E/AndroidRuntime(2831): at dalvik.system.NativeStart.main(Native Method)
12-11 22:53:51.502: E/AndroidRuntime(2831): Caused by: java.lang.IllegalStateException
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.media.MediaRecorder.stop(Native Method)
12-11 22:53:51.502: E/AndroidRuntime(2831): at com.example.callrecorder.IncomingCallReceiver.onReceive(IncomingCallReceiver.java:63)
12-11 22:53:51.502: E/AndroidRuntime(2831): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2355)
12-11 22:53:51.502: E/AndroidRuntime(2831): ... 10 more
日誌表明您正嘗試在閒置狀態下停止媒體記錄器。這表明您要麼在新創建的媒體播放器（尚未啓動）上調用「stop」，要麼在同一個mediaplayer上調用兩次。 – Michael
看來，一旦我結束通話並進入TelephonyManager.EXTRA_STATE_IDLE狀態，mRecorder將無法找到。調用mRecorder.stop（）時引發異常。 – Chewy
BroadcastReceiver文檔聲明：「一個BroadcastReceiver對象只在調用onReceive（Context，Intent）期間有效，一旦你的代碼從這個函數返回，系統就認爲該對象已經完成並且不再活動。」所以我建議你把'mRecorder'放在一個外部類中，或者使它成爲靜態的。 – Michael