android.media.MediaPlayer#prepare ( )源码实例Demo

下面列出了android.media.MediaPlayer#prepare ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： barcodescanner-lib-aar 文件： BeepManager.java

private MediaPlayer buildMediaPlayer(Context activity) {
  MediaPlayer mediaPlayer = new MediaPlayer();
  try {
    AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
    try {
      mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
    } finally {
      file.close();
    }
    mediaPlayer.setOnErrorListener(this);
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setLooping(false);
    mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
    mediaPlayer.prepare();
    return mediaPlayer;
  } catch (IOException ioe) {
    Log.w(TAG, ioe);
    mediaPlayer.release();
    return null;
  }
}

源代码2 项目： Example-of-Cocos2DX 文件： Cocos2dxMusic.java

/**
 * create mediaplayer for music
 * 
 * @param pPath
 *            the pPath relative to assets
 * @return
 */
private MediaPlayer createMediaplayer(final String pPath) {
	MediaPlayer mediaPlayer = new MediaPlayer();

	try {
		if (pPath.startsWith("/")) {
			final FileInputStream fis = new FileInputStream(pPath);
			mediaPlayer.setDataSource(fis.getFD());
			fis.close();
		} else {
			final AssetFileDescriptor assetFileDescritor = this.mContext.getAssets().openFd(pPath);
			mediaPlayer.setDataSource(assetFileDescritor.getFileDescriptor(), assetFileDescritor.getStartOffset(), assetFileDescritor.getLength());
		}

		mediaPlayer.prepare();

		mediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume);
	} catch (final Exception e) {
		mediaPlayer = null;
		Log.e(Cocos2dxMusic.TAG, "error: " + e.getMessage(), e);
	}

	return mediaPlayer;
}

源代码3 项目： Android-AudioRecorder-App 文件： PlaybackFragment.java

private void startPlaying() {
  mPlayButton.setImageResource(R.drawable.ic_media_pause);
  mMediaPlayer = new MediaPlayer();

  try {
    mMediaPlayer.setDataSource(item.getFilePath());
    mMediaPlayer.prepare();
    mSeekBar.setMax(mMediaPlayer.getDuration());

    mMediaPlayer.setOnPreparedListener(mp -> mMediaPlayer.start());
  } catch (IOException e) {
    Log.e(LOG_TAG, "prepare() failed");
  }

  mMediaPlayer.setOnCompletionListener(mp -> stopPlaying());

  updateSeekBar();

  //keep screen on while playing audio
  getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}

源代码4 项目： android-docs-samples 文件： AppController.java

public static void playAudio(byte[] byteArray) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    try {
        File tempFile = File.createTempFile("dialogFlow", null,
                Environment.getExternalStorageDirectory());
        tempFile.deleteOnExit();
        FileOutputStream fos = new FileOutputStream(tempFile);
        fos.write(byteArray);
        fos.close();
        mediaPlayer.reset();
        FileInputStream fis = new FileInputStream(tempFile);
        mediaPlayer.setDataSource(fis.getFD());

        mediaPlayer.prepare();
        mediaPlayer.start();
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

源代码5 项目： Moring-Alarm 文件： AlarmRingService.java

private void ringTheAlarm(String song) {
    AssetFileDescriptor assetFileDescriptor= null;
    try {
        mPlayer=new MediaPlayer();

        mPlayer.reset();
        mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        if(song.contains("/")){
            //说明是自定义铃声
            mPlayer.setDataSource(song);
        }else{
            assetFileDescriptor = this.getAssets().openFd(song);
            mPlayer.setDataSource(assetFileDescriptor.getFileDescriptor(),
                    assetFileDescriptor.getStartOffset(), assetFileDescriptor.getLength());
        }
        mPlayer.setVolume(1f, 1f);
        mPlayer.setLooping(true);
        mPlayer.prepare();
        mPlayer.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

源代码6 项目： coursera-android 文件： AudioRecordingActivity.java

private void startPlaying() {

        mPlayer = new MediaPlayer();

        mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mPlayButton.performClick();
                mPlayButton.setChecked(false);
            }
        });

        try {
            mPlayer.setDataSource(mFileName);
            mPlayer.prepare();
            mPlayer.start();
        } catch (IOException e) {
            Log.e(TAG, "Couldn't prepare and start MediaPlayer");
        }

    }

源代码7 项目： reacteu-app 文件： BeepManager.java

private static MediaPlayer buildMediaPlayer(Context activity) {
  MediaPlayer mediaPlayer = new MediaPlayer();
  mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  // When the beep has finished playing, rewind to queue up another one.
  mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer player) {
      player.seekTo(0);
    }
  });

  AssetFileDescriptor file = activity.getResources().openRawResourceFd(fakeR.getId("raw", "beep"));
  try {
    mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
    file.close();
    mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
    mediaPlayer.prepare();
  } catch (IOException ioe) {
    Log.w(TAG, ioe);
    mediaPlayer = null;
  }
  return mediaPlayer;
}

源代码8 项目： analyzer-of-android-for-Apache-Weex 文件： BeepManager.java

private MediaPlayer buildMediaPlayer(Context activity) {
  MediaPlayer mediaPlayer = new MediaPlayer();
  try {
    AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
    try {
      mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
    } finally {
      file.close();
    }
    mediaPlayer.setOnErrorListener(this);
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setLooping(false);
    mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
    mediaPlayer.prepare();
    return mediaPlayer;
  } catch (IOException ioe) {
    Log.w(TAG, ioe);
    mediaPlayer.release();
    return null;
  }
}

源代码9 项目： LoveTalkClient 文件： PlayButton.java

public void playAudio() {
	if (prepared == false) {
		try {
			mediaPlayer = new MediaPlayer();
			mediaPlayer.setDataSource(path);
			mediaPlayer.prepare();
			mediaPlayer.start();
			mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
				@Override
				public void onCompletion(MediaPlayer mp) {
					setBackgroundResource(backResourceId);
				}
			});
			setBackgroundDrawable(null);
			prepared = true;
		} catch (IOException e) {
			e.printStackTrace();
			Utils.toast(e.getMessage());
		}
	} else {
		mediaPlayer.start();
		setBackgroundDrawable(null);
	}
}

源代码10 项目： RecordDialog 文件： RecordDialog.java

private void startMediaPlayer() {
    mediaPlayer = new MediaPlayer();
    try {
        mediaPlayer.setDataSource(_AudioSavePathInDevice);
        mediaPlayer.prepare();
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                stopMediaPlayer();
            }
        });
    } catch (IOException e) {
        e.printStackTrace();
    }
    _recordButton.setImageResource(R.drawable.ic_pause);
    STATE_BUTTON = "PLAY";
    playerSecondsElapsed = 0;
    startTimer();
    mediaPlayer.start();
}

源代码11 项目： Beginner-Level-Android-Studio-Apps 文件： List_Activity.java

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
{
    MediaPlayer mp = new MediaPlayer();
    try
    {
        mp.setDataSource(list_files[i].getPath());
        mp.prepare();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }

    mp.start();

    Dialog_Fragment_Play dialog = new Dialog_Fragment_Play(this , list_files[i] , mp);
    dialog.show(this.getSupportFragmentManager() , "dialog");
}

源代码12 项目： pretixdroid 文件： MainActivity.java

private MediaPlayer buildMediaPlayer(Context activity) {
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setOnCompletionListener(this);
    // mediaPlayer.setOnErrorListener(this);
    try {
        AssetFileDescriptor file = activity.getResources()
                .openRawResourceFd(R.raw.beep);
        try {
            mediaPlayer.setDataSource(file.getFileDescriptor(),
                    file.getStartOffset(), file.getLength());
        } finally {
            file.close();
        }
        mediaPlayer.setVolume(0.10f, 0.10f);
        mediaPlayer.prepare();
        return mediaPlayer;
    } catch (IOException ioe) {
        mediaPlayer.release();
        return null;
    }
}

源代码13 项目： ClockPlus 文件： RingtoneLoop.java

public void play() {
    try {
        mMediaPlayer = new MediaPlayer();
        mMediaPlayer.setDataSource(mContext, mUri);
        if (mAudioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) {
            // "Must call this method before prepare() or prepareAsync() in order
            // for the target stream type to become effective thereafter."
            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
            mMediaPlayer.setLooping(true);
            // There is prepare() and prepareAsync().
            // "For files, it is OK to call prepare(), which blocks until
            // MediaPlayer is ready for playback."
            mMediaPlayer.prepare();
            mMediaPlayer.start();
        }
    } catch (SecurityException | IOException e) {
        destroyLocalPlayer();
    }
}

源代码14 项目： commcare-android 文件： MenuGrid.java

@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
        int position, long id) {
    MenuDisplayable value = (MenuDisplayable)parent.getAdapter().getItem(position);
    String audioURI = value.getAudioURI();
    MediaPlayer mp = new MediaPlayer();
    String audioFilename;
    if (audioURI != null && !audioURI.equals("")) {
        try {
            audioFilename = ReferenceManager.instance().DeriveReference(audioURI).getLocalURI();
            mp.setDataSource(audioFilename);
            mp.prepare();
            mp.start();
        } catch (IOException | IllegalStateException
                | InvalidReferenceException e) {
            e.printStackTrace();
        }
    }
    return false;
}

源代码15 项目： ZXingProject 文件： BeepManager.java

private MediaPlayer buildMediaPlayer(Context activity) {
	MediaPlayer mediaPlayer = new MediaPlayer();
	mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
	mediaPlayer.setOnCompletionListener(this);
	mediaPlayer.setOnErrorListener(this);
	try {
		AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
		try {
			mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
		} finally {
			file.close();
		}
		mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
		mediaPlayer.prepare();
		return mediaPlayer;
	} catch (IOException ioe) {
		Log.w(TAG, ioe);
		mediaPlayer.release();
		return null;
	}
}

源代码16 项目： VinylMusicPlayer 文件： MultiPlayer.java

/**
 * @param player The {@link MediaPlayer} to use
 * @param path   The path of the file, or the http/rtsp URL of the stream
 *               you want to play
 * @return True if the <code>player</code> has been prepared and is
 * ready to play, false otherwise
 */
private boolean setDataSourceImpl(@NonNull final MediaPlayer player, @NonNull final String path) {
    if (context == null) {
        return false;
    }
    try {
        player.reset();
        player.setOnPreparedListener(null);
        if (path.startsWith("content://")) {
            player.setDataSource(context, Uri.parse(path));
        } else {
            player.setDataSource(path);
        }
        player.setAudioStreamType(AudioManager.STREAM_MUSIC);
        player.prepare();
    } catch (Exception e) {
        return false;
    }
    player.setOnCompletionListener(this);
    player.setOnErrorListener(this);
    final Intent intent = new Intent(AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION);
    intent.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, getAudioSessionId());
    intent.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, context.getPackageName());
    intent.putExtra(AudioEffect.EXTRA_CONTENT_TYPE, AudioEffect.CONTENT_TYPE_MUSIC);
    context.sendBroadcast(intent);
    return true;
}

源代码17 项目： redalert-android 文件： SoundLogic.java

static void playSoundURI(Uri alarmSoundUi, Context context) {
    // No URI?
    if (alarmSoundUi == null) {
        return;
    }

    // Already initialized or currently playing?
    stopSound(context);

    // Create new MediaPlayer
    mPlayer = new MediaPlayer();

    // Wake up processor
    mPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);

    // Set stream type
    mPlayer.setAudioStreamType(getSoundStreamType(context));

    try {
        // Set URI data source
        mPlayer.setDataSource(context, alarmSoundUi);

        // Prepare media player
        mPlayer.prepare();
    }
    catch (Exception exc) {
        // Log it
        Log.e(Logging.TAG, "Media player preparation failed", exc);

        // Show visible error toast
        Toast.makeText(context, exc.toString(), Toast.LENGTH_LONG).show();
    }

    // Actually start playing
    mPlayer.start();
}

源代码18 项目： LocationAware 文件： LocationAwareService.java

private void startPlayer() {
  mPlayer = new MediaPlayer();
  mPlayer.setOnErrorListener(mErrorListener);

  try {
    isAlarmRinging = true;
    // add vibration to alarm alert if it is set
    //if (App.getState().settings().vibrate()) {
    mVibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
    mHandler.post(mVibrationRunnable);
    //}
    // Player setup is here
    String ringtone;// = App.getState().settings().ringtone();
    //if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
    //    && ringtone.startsWith("content://media/external/")
    //    && checkSelfPermission(
    //    Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_DENIED) {
    ringtone = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM).toString();
    //}
    mPlayer.setDataSource(this, Uri.parse(ringtone));
    mPlayer.setLooping(true);
    mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
    mPlayer.setVolume(mVolumeLevel, mVolumeLevel);
    mPlayer.prepare();
    mPlayer.start();

    //if (App.getState().settings().ramping()) {
    //  mHandler.postDelayed(mVolumeRunnable, VOLUME_INCREASE_DELAY);
    //} else {
    mPlayer.setVolume(MAX_VOLUME, MAX_VOLUME);
    //}
  } catch (Exception e) {
    isAlarmRinging = false;
    if (mPlayer.isPlaying()) {
      mPlayer.stop();
    }
    stopSelf();
  }
}

源代码19 项目： MultiMediaSample 文件： MainActivity.java

/**
 * 播放输入框的文件
 */
private void play(){
    String path=etPath.getText().toString().trim();
    mMediapPlayer=new MediaPlayer();
    try {
        //设置数据类型
        mMediapPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        //设置以下播放器显示的位置
        mMediapPlayer.setDisplay(holder);

        mMediapPlayer.setDataSource(path);
        mMediapPlayer.prepare();
        mMediapPlayer.start();

        mMediapPlayer .setOnCompletionListener(this);
        //把当前播放器的状诚置为：播放中
        currentstate=PLAYING;

        //把音乐文件的总长度取出来，设置给seekbar作为最大值
        int duration=mMediapPlayer.getDuration();//总时长
        mSeekbar.setMax(duration);
        //把总时间显示textView上
        int m=duration/1000/60;
        int s=duration/1000%60;
        tvTotalTime.setText("/"+m+":"+s);
        tvCurrentTime.setText("00:00");

        isStopUpdatingProgress=false;
        new Thread(new UpdateProgressRunnable()).start();


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

源代码20 项目： codeexamples-android 文件： MediaPlayerDemo_Video.java

private void playVideo(Integer Media) {
    doCleanUp();
    try {

        switch (Media) {
            case LOCAL_VIDEO:
                /*
                 * TODO: Set the path variable to a local media file path.
                 */
                path = "";
                if (path == "") {
                    // Tell the user to provide a media file URL.
                    Toast
                            .makeText(
                                    MediaPlayerDemo_Video.this,
                                    "Please edit MediaPlayerDemo_Video Activity, "
                                            + "and set the path variable to your media file path."
                                            + " Your media file must be stored on sdcard.",
                                    Toast.LENGTH_LONG).show();

                }
                break;
            case STREAM_VIDEO:
                /*
                 * TODO: Set path variable to progressive streamable mp4 or
                 * 3gpp format URL. Http protocol should be used.
                 * Mediaplayer can only play "progressive streamable
                 * contents" which basically means: 1. the movie atom has to
                 * precede all the media data atoms. 2. The clip has to be
                 * reasonably interleaved.
                 * 
                 */
                path = "";
                if (path == "") {
                    // Tell the user to provide a media file URL.
                    Toast
                            .makeText(
                                    MediaPlayerDemo_Video.this,
                                    "Please edit MediaPlayerDemo_Video Activity,"
                                            + " and set the path variable to your media file URL.",
                                    Toast.LENGTH_LONG).show();

                }

                break;


        }

        // Create a new media player and set the listeners
        mMediaPlayer = new MediaPlayer();
        mMediaPlayer.setDataSource(path);
        mMediaPlayer.setDisplay(holder);
        mMediaPlayer.prepare();
        mMediaPlayer.setOnBufferingUpdateListener(this);
        mMediaPlayer.setOnCompletionListener(this);
        mMediaPlayer.setOnPreparedListener(this);
        mMediaPlayer.setOnVideoSizeChangedListener(this);
        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);


    } catch (Exception e) {
        Log.e(TAG, "error: " + e.getMessage(), e);
    }
}

方法所在类

android.media.MediaPlayer