停止时Android MediaRecorder异常

Question

我正在创建一个记录来电和外拨电话的应用。录音应该在通话结束时停止。但是我得到非法状态异常。例外是mediarecorder.stop()。＆＃34;在无效状态4和＃34之间停止呼叫; < /strong>。我不知道这意味着什么。这是我第一次使用MediaRecorder。我已经检查了类似的问题..但是他们的答案对我没有帮助。感谢您的帮助。谢谢。这个问题Error on MediaRecorder Stop : stop called in invalid state 4没有帮助我，因为该问题中的问题是用户名为在调用 stop（）方法之前准备好（）。它与我的情况不太相似。

代码：

import android.Manifest;
import android.content.Context;
import android.media.MediaRecorder;
import android.support.v4.app.ActivityCompat;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;

public class TeleListener extends PhoneStateListener {
    private Context context;
    boolean isRinging=false;
    String filepath;
    String internalfilename="AUD";


    public TeleListener(Context context,String filepath) {
        this.context = context;
        this.filepath=filepath;
    }

    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        super.onCallStateChanged(state, incomingNumber);
        MediaRecorder mediaRecorder= new MediaRecorder();
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mediaRecorder.setOutputFile(filepath+internalfilename);
        switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:

                if (isRinging) {
                    mediaRecorder.stop();
                    mediaRecorder.reset();
                    mediaRecorder.release();
                    isRinging=false;
                }
                Toast.makeText(context, "Idle", Toast.LENGTH_SHORT).show();
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                isRinging=false;
                Toast.makeText(context, "Offhook", Toast.LENGTH_SHORT).show();
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                isRinging=true;
                try {
                    mediaRecorder.prepare();
                    mediaRecorder.start();

                } catch (IOException e) {
                    e.printStackTrace();
                }

                Toast.makeText(context, "Ringing", Toast.LENGTH_SHORT).show();
                break;

        }

    }
}

例外：

E/MediaRecorder: stop called in an invalid state: 4
03-E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalStateException
at android.media.MediaRecorder._stop(Native Method)
at android.media.MediaRecorder.stop(MediaRecorder.java:967)
at TeleListener.onCallStateChanged(TeleListener.java:43)
at android.telephony.PhoneStateListener$1.handleMessage
(PhoneStateListener.java:323)                                                                                            
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325) 
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

private void stopRecording() {
if (null != recorder){
    try {
        recorder.prepare(); 

当您停止 MediaRecorder 时，您不应该致电准备。 准备方法是您在启动录像机之前调用的方法。请参阅 MediaRecorder 文档中的状态图。