【移動應(yīng)用開發(fā)技術(shù)】android怎么實(shí)現(xiàn)音樂播放器進(jìn)度條效果

這篇文章主要介紹android怎么實(shí)現(xiàn)音樂播放器進(jìn)度條效果，文中介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們一定要看完！具體內(nèi)容如下效果圖依賴3個對象MediaPlayer：實(shí)現(xiàn)音樂播放，暫停，緩沖。SeekBar:滑動的進(jìn)度條。java.util.Timer:定時器，時時更新進(jìn)度條。main.xml樣式文件<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"

/>

<EditText

android:id="@+id/mediaFileName"

android:layout_width="match_parent"

android:text="gangstabop.mp3"

android:layout_height="wrap_content"

>

<requestFocus

/>

</EditText>

<LinearLayout

android:id="@+id/linearButton"

android:layout_width="match_parent"

android:layout_height="wrap_content"

>

<Button

android:id="@+id/playButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/stop"

/>

<SeekBar

android:id="@+id/playSeekBar"

android:layout_width="140px"

android:layout_height="wrap_content"

android:layout_marginLeft="3px"

android:layout_marginTop="5px"

/>

<Button

android:id="@+id/replayButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="3px"

android:text="@string/replay"

/>

</LinearLayout>Activity實(shí)現(xiàn)代碼/**

*

@CreateDate

2015-2-3

*

@Author

hubiao

*

@Title

音樂播放器

*/

public

class

MediaActivity

extends

Activity

{

private

MediaPlayer

mediaPlayer;//媒體播放器

private

Button

playButton;

private

Button

replayButton

;

private

boolean

isCellPlay;/*在掛斷電話的時候，用于判斷是否為是來電時中斷*/

private

boolean

isSeekBarChanging;//互斥變量，防止進(jìn)度條與定時器沖突。

private

int

currentPosition;//當(dāng)前音樂播放的進(jìn)度

private

SeekBar

seekBar;

private

Timer

timer;

private

static

final

String

TAG

=

"MediaActivity";

@Override

public

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//實(shí)例化媒體播放器

mediaPlayer

=

new

MediaPlayer();

//監(jiān)聽滾動條事件

seekBar

=

(SeekBar)

findViewById(R.id.playSeekBar);

seekBar.setOnSeekBarChangeListener(new

MySeekBar());

//

監(jiān)聽[播放或暫停]事件

playButton=

(Button)

findViewById(R.id.playButton);

playButton.setOnClickListener(new

PalyListener());

//監(jiān)聽[重播]事件

replayButton=

(Button)

findViewById(R.id.replayButton);

replayButton.setOnClickListener(new

OnClickListener()

{

public

void

onClick(View

v)

{

mediaPlayer.reset();

currentPosition

=

0;

play();

}

});

//監(jiān)聽來電事件

TelephonyManager

phoneyMana

=

(TelephonyManager)

getSystemService(Context.TELEPHONY_SERVICE);

phoneyMana.listen(new

myPhoneStateListener(),PhoneStateListener.LISTEN_CALL_STATE);

}

/*銷毀時釋資源*/

@Override

protected

void

onDestroy()

{

mediaPlayer.release();

timer.cancel();

timer

=

null;

mediaPlayer

=

null;

super.onDestroy();

}

/*播放或暫停事件處理*/

private

class

PalyListener

implements

OnClickListener

{

public

void

onClick(View

v)

{

if(playButton.getText().toString().equals("播放"))

{

currentPosition

=

mediaPlayer.getCurrentPosition();//記錄播放的位置

mediaPlayer.stop();//暫停狀態(tài)

playButton.setText(R.string.stop);

timer.purge();//移除所有任務(wù);

}

else{

mediaPlayer.reset();

play();

}

}

}

/*播放處理*/

private

void

play()

{

File

media

=

new

File("/mnt/sdcard/files/","bewithyou.mp3");//由于是練習(xí)，就把mp3名稱固定了

Log.i(TAG,

media.getAbsolutePath());

if(media.exists())

{

try

{

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//設(shè)置音頻類型

mediaPlayer.setDataSource(media.getAbsolutePath());//設(shè)置mp3數(shù)據(jù)源

mediaPlayer.prepareAsync();//數(shù)據(jù)緩沖

/*監(jiān)聽緩存

事件，在緩沖完畢后，開始播放*/

mediaPlayer.setOnPreparedListener(new

OnPreparedListener()

{

public

void

onPrepared(MediaPlayer

mp)

{

mp.start();

mp.seekTo(currentPosition);

playButton.setText(R.string.play);

seekBar.setMax(mediaPlayer.getDuration());

}

});

//監(jiān)聽播放時回調(diào)函數(shù)

timer

=

new

Timer();

timer.schedule(new

TimerTask()

{

@Override

public

void

run()

{

if(!isSeekBarChanging){

seekBar.setProgress(mediaPlayer.getCurrentPosition());

}

}

},0,50);

}

catch

(Exception

e)

{

Toast.makeText(getApplicationContext(),

R.string.playError,

Toast.LENGTH_LONG).show();

e.printStackTrace();

System.out.println(e);

}

}

else{

Toast.makeText(getApplicationContext(),

R.string.fileError,

Toast.LENGTH_LONG).show();

}

}

/*來電事件處理*/

private

class

myPhoneStateListener

extends

PhoneStateListener

{

@Override

public

void

onCallStateChanged(int

state,

String

incomingNumber)

{

switch

(state)

{

case

TelephonyManager.CALL_STATE_RINGING://來電，應(yīng)當(dāng)停止音樂

if(mediaPlayer.isPlaying()

&&

playButton.getText().toString().equals("播放")){

currentPosition

=

mediaPlayer.getCurrentPosition();//記錄播放的位置

mediaPlayer.stop();

isCellPlay

=

true;//標(biāo)記這是屬于來電時暫停的標(biāo)記

playButton.setText(R.string.stop);

timer.purge();//移除定時器任務(wù);

}

break;

case

TelephonyManager.CALL_STATE_IDLE://無電話狀態(tài)

if(isCellPlay){

isCellPlay

=

false;

mediaPlayer.reset();

play();

}

break;

}

}

}

/*進(jìn)度條處理*/

public

class

MySeekBar

implements

OnSeekBarChangeListener{

public

void

onProgressChanged(SeekBar

seekBar,

int

progress,

boolean

fromUser)

{

}

/*滾動時,應(yīng)當(dāng)暫停后臺定時器*/

public

void

onStartTrackingTouch(SeekBar

seekBar)

{

isSeekBarChanging

=

true;

}

/*滑動結(jié)束后，重新設(shè)置值*/

public

void

onStopTrackingTouch(SeekBar

seekBar)

{

isSeekBarChanging

=

false;

mediaPlayer.seekTo(seekBar.getProgress());

}

}

}補(bǔ)充：1.如果mp3在sd中，如播放失敗，是否申請sd訪問權(quán)限或mp3文件是否存在。2.MediaPlayer對有個別的音頻好像不太支持，如果路徑正確，權(quán)限具備還無法播放，就考慮下音頻問題。3.本案例用到的權(quán)限。<