暂停播放记录在android

Question

我有一个简单的类来记录声音并在记录播放文件后播放它:

public class MainActivity extends Activity
{
    private static final String LOG_TAG = "AudioRecordTest";
    private static String mFileName = null;
    private MediaRecorder mRecorder = null;
    private Button startRecord, startPlaying, stopPlaying;
    private MediaPlayer   mPlayer = null;
    private void onRecord(boolean start) {
        if (start) {
            startRecording();
        } else {
            stopRecording();
        }
    }
    private void onPlay(boolean start) {
        if (start) {
            startPlaying();
        } else {
            //stopPlaying();
            pausePlaying();
        }
    }
    private void startPlaying() {
        mPlayer = new MediaPlayer();
        try {
            mPlayer.setDataSource(mFileName);
            mPlayer.prepare();
            mPlayer.start();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }
    }
    private void stopPlaying() {
        mPlayer.release();
        mPlayer = null;
    }
    private void pausePlaying(){
        mPlayer.stop();
    }
    private void startRecording() {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }
        mRecorder.start();
    }
    private void stopRecording() {
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
    }

    public MainActivity() {
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        mFileName += "/audiorecordtest.3gp";
    }
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_main);
        startPlaying = (Button) findViewById(R.id.buttonStartPlay);
        stopPlaying = (Button) findViewById(R.id.buttonStopPlaying);
        startRecord = (Button) findViewById(R.id.buttonStartRecord);
        startRecord.setOnClickListener(new OnClickListener() {
            boolean mStartRecording = true;
            @Override
            public void onClick(View v) {
                onRecord(mStartRecording);
                if (mStartRecording) {
                    startRecord.setText("Stop recording");
                } else {
                    startRecord.setText("Start recording");
                }
                mStartRecording = !mStartRecording;
            }
        });       
        startPlaying.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                onPlay(true);
            }
        });
        stopPlaying.setOnClickListener(new OnClickListener() {
            boolean mStartPlaying = true;
            @Override
            public void onClick(View v) {
                onPlay(false);
            }
        });
    }
    @Override
    public void onPause() {
        super.onPause();
        if (mRecorder != null) {
            mRecorder.release();
            mRecorder = null;
        }
        if (mPlayer != null) {
            mPlayer.release();
            mPlayer = null;
        }
    }
}

我知道如何暂停，但我不知道如何再次运行文件，但从我暂停文件的那一刻起。什么好主意吗?

Answer 1

改变:

private void pausePlaying(){
            mPlayer.stop();
        }

:

    private void pausePlaying(){
           if(mPlayer.isPlaying()){
                 mPlayer.pause();
             } else {
               mPlayer.start();
             }
     }

Answer 2

不要使用。stop()来暂停。在MediaPlayer API中，你可以看到.pause()是最好的选择。如果你重新组织

    mPlayer.setDataSource(mFileName);
    mPlayer.prepare();

发生在你的onCreate方法中，你可以避免它每次重置。查看他们的图表https://i.stack.imgur.com/svHrq.gif