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長按然后就自動崩潰了，代碼也對著視頻看了幾遍，問答區也經常來關注，就是解決不了我的問題，只能來求老師幫忙了！

http://img1.sycdn.imooc.com//5553ea6d00014ed810270467.jpg

package?com.fy.recorder.view;

import?java.io.File;
import?java.io.IOException;
import?java.util.UUID;

import?android.media.MediaRecorder;

public?class?AudioManager
{
???private?MediaRecorder?mMediaRecorder;
???private?String?mDir;
???private?String?mCurrentFilePath;
???private?static?AudioManager?mInstance;
???private?AudioManager(String?dir)?
???{
	???mDir=dir;
???}
?
public?interface?AudioStateListener
???{
	???void?wellPrepared();
???}
???public?AudioStateListener?mListener;
???public?boolean?isPrepared;
public?String?getCurrentfilePath()
{
	return?mCurrentFilePath;
	
}
???public?void?setOnAudioStateListener(AudioStateListener?listener)
???{
	???mListener=listener;
???}
???public?static?AudioManager?getInstance(String?dir)
???{
	???if(mInstance==null)
	???{
		???synchronized(AudioManager.class)
		???{
			???if(mInstance==null)
				???mInstance=new?AudioManager(dir);
		???}
	???}
	???return?mInstance;
???}
??
???public?void?prepareAudio()
???{
	???try{
		isPrepared=false;
	???File?dir=new?File(mDir);
	???if(!dir.exists())
		???dir.mkdirs();
	String?fileName=generateFileName();
	File?file?=new?File(dir,fileName);
	
	mCurrentFilePath=file.getAbsolutePath();
	mMediaRecorder=new?MediaRecorder();
	
	//設置音頻源
	mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
	//設置音頻格式
	mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
	//設置音頻編碼
	mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
	//設置輸出文件
	mMediaRecorder.setOutputFile(file.getAbsolutePath());
	mMediaRecorder.prepare();
	mMediaRecorder.start();

	isPrepared=true;
	
	
	
	if(mListener!=null)
	{
		mListener.wellPrepared();
		}
	???}catch(IllegalStateException|IOException?e)
	???{
		???e.printStackTrace();
	???}
???}

???private?String?generateFileName()?
???
???{
	
	return?UUID.randomUUID().toString()+".amr";
}
public?int?getVoiceLevel(int?maxLevel)
???{
	??if(isPrepared)
	??{
		?try?{
			?//?maxLevel*mMediaRecorder.getMaxAmplitude()?1-32767
		??return?maxLevel*mMediaRecorder.getMaxAmplitude()/32768+1;
		}?catch?(Exception?e)?
		{
	
		}
	??}
	??return?1;
???}
???public?void?release()
???{
	???mMediaRecorder.stop();
	???mMediaRecorder.release();
	???mMediaRecorder=null;
???}
???public?void?cancel()
???{
	???
	???release();
	???if(mCurrentFilePath!=null)
	???{
	???File?file=new?File(mCurrentFilePath);
	???file.delete();
	???mCurrentFilePath=null;
???????}
???
???}
}

然后是Button的

package?com.fy.recorder.view;

import?com.fy.recorder.R;
import?com.fy.recorder.view.AudioManager.AudioStateListener;

import?android.content.Context;
import?android.os.Environment;
import?android.os.Handler;
import?android.util.AttributeSet;
import?android.view.MotionEvent;
import?android.view.View;
import?android.widget.Button;

public?class?recorderButton?extends?Button?implements?AudioStateListener?{

private?static?final?int?DISTANCE_Y_CANCEL=50;
private?static?final?int?STATE_NORMAL=1;
private?static?final?int?STATE_RECORDING=2;
private?static?final?int?STATE_WANT_TO_CANCEL=3;
private?int?mCurState=STATE_NORMAL;
private?boolean?isRecording=false;
private?DialogManager?mDialogManager;

private?AudioManager?mAudioManager;

private?float?mTime=0;
//
private?boolean?mReady;
public?recorderButton(Context?context)?{
this(context,null);

}

public?recorderButton(Context?context,?AttributeSet?attrs)?{
super(context,?attrs);
mDialogManager=new?DialogManager(getContext());
String?dir=Environment.getExternalStorageState()+"/recorder_audios";
mAudioManager=AudioManager.getInstance(dir);
mAudioManager.setOnAudioStateListener(this);
setOnLongClickListener(new?OnLongClickListener()?{

@Override
public?boolean?onLongClick(View?v)
{
mReady=true;
????mAudioManager.prepareAudio();
return?false;
}


});
}
//回調
public?interface?AudioFinishRecorderListener
{
void?onFinish(float?seconds,String?filePath);
}
private?AudioFinishRecorderListener?mListener;
public?void?setAudioFinishRecorderListener(AudioFinishRecorderListener?listener)
{
mListener=listener;
}
//獲取音量大小
private?Runnable?mGetVOiceLevelRunnable=new?Runnable()
{

@Override
public?void?run()
{

while(isRecording)
{
try?{
Thread.sleep(100);
mTime+=0.1f;
mHandler.sendEmptyMessage(MSG_VOICE_CHANGED);
}?catch?(InterruptedException?e)
{
e.printStackTrace();
}
}
}
};
private?static?final?int?MSG_AUDIO_PREPARED=0X111;
private?static?final?int?MSG_VOICE_CHANGED=0X112;
private?static?final?int?MSG_DIALOG_DIMSS=0X113;

private?Handler?mHandler=new?Handler()
{
public?void?handleMessage(android.os.Message?msg)
{
switch?(msg.what)?{
case?MSG_AUDIO_PREPARED:
//
mDialogManager.showRecordingDialog();

isRecording=true;
new?Thread(mGetVOiceLevelRunnable).start();
break;
case?MSG_VOICE_CHANGED:
mDialogManager.updateVoiceLevel(mAudioManager.getVoiceLevel(7));
break;
case?MSG_DIALOG_DIMSS:
mDialogManager.dimissDialog();
break;


}
}

};
?
@Override
public?void?wellPrepared()?
{

???????mHandler.sendEmptyMessage(MSG_AUDIO_PREPARED);

}
@Override
public?boolean?onTouchEvent(MotionEvent?event)?{
int?action=event.getAction();
int?x=(int)event.getX();
int?y=(int)event.getY();
switch(action)
{
case?MotionEvent.ACTION_DOWN:

changeState(STATE_RECORDING);
break;
case?MotionEvent.ACTION_MOVE:

if(isRecording)
{
if(wangtToCancel(x,y))
{
changeState(STATE_WANT_TO_CANCEL);

}else{
changeState(STATE_RECORDING);
}
}
break;
case?MotionEvent.ACTION_UP:
if(!mReady){
reset();
return?super.onTouchEvent(event);
}
if(isRecording||mTime<0.6f)
{
mDialogManager.tooShort();
mAudioManager.cancel();
mHandler.sendEmptyMessageDelayed(MSG_DIALOG_DIMSS,?1300);
}else?if(mCurState==STATE_RECORDING)//正常錄制結束
{

mDialogManager.dimissDialog();
mAudioManager.release();

if(mListener!=null)
{
mListener.onFinish(mTime,?mAudioManager.getCurrentfilePath());
}
}else?if(mCurState==STATE_WANT_TO_CANCEL)
{
mDialogManager.dimissDialog();
mAudioManager.cancel();
}
reset();
break;
}

return?super.onTouchEvent(event);
}
private?void?reset()?{

isRecording=false;
mReady=false;
mTime=0;
changeState(STATE_NORMAL);

}

private?boolean?wangtToCancel(int?x,?int?y)?{
//?TODO?Auto-generated?method?stub
if(x<0||x>getWidth())
{
return?true;
}
if(y<-DISTANCE_Y_CANCEL||y>getHeight()+DISTANCE_Y_CANCEL)
{
return?true;
}
return?false;
}

private?void?changeState(int?state)?{
//?TODO?Auto-generated?method?stub
if(mCurState!=state)
{
mCurState=state;

switch?(state)?{
case?STATE_NORMAL:
????????????????setBackgroundResource(R.drawable.btn_recorder_normal);
????????????????setText(R.string.str_recorder_normal);
break;
????????????case?STATE_RECORDING:
????????????setBackgroundResource(R.drawable.btn_recording);
????????????????setText(R.string.str_recorder_recording);
if(isRecording)
{
mDialogManager.recording();
}
????????????????break;
????????????case?STATE_WANT_TO_CANCEL:
????????????setBackgroundResource(R.drawable.btn_recording);
????????????????setText(R.string.str_recorder_want_cancel);
??????????mDialogManager.wantToCancel();????????
??????????break;

default:
break;
}
}
}


}


不知道怎么上傳代碼只能復制了，謝謝老師??！

正在回答

1 回答

首先感謝你對慕課的支持，我詳細查看了你貼出的代碼，沒有發現問題。根據你貼出的異常信息，出錯是因為MediaRecorder的狀態轉移出現的問題，建議你還是根據log排查下，ps：記得使用真機測試。

0 回復 有任何疑惑可以回復我~
#1

h0pe

我也是這個問題,最后發現是 自動補全的exception 是"IllegalStateException"就會松開后崩潰,該成 catch (Exception e) 就ok了 請問一下 IllegalStateException和Exception有什么區別? 謝謝
2015-10-14 回復 有任何疑惑可以回復我~
#2

h0pe

感覺問題在下面這個方法 public int getMaxAmplitude () the maximum absolute amplitude measured since the last call, or 0 when called for the first time Throws IllegalStateException if it is called before the audio source has been set. if it is called before the audio source has been set.是什么意思?
2015-10-14 回復 有任何疑惑可以回復我~

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長按然后就自動崩潰了，代碼也對著視頻看了幾遍，問答區也經常來關注，就是解決不了我的問題，只能來求老師幫忙了！

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