Android的Service服务实际应用

作为Android四大组件之一的Service在Android系统中占据着重要的分量，因为它可是在后台调用的，不以图像的形式呈现在我们的眼前。但正是因为如此，才可以使我们的操作系统变得更加实用。

今天，我要给大家分享一个简单的图片音乐播放器，来让我们更好的认识一下这个组件。

1.下面这段代码，是使用了Github上的图片的动画格式，以及回调函数操作图片。

<span style="font-size:18px;">public class PicAndMusActivity extends AppCompatActivity
implements PhotoMoveService.Music{
private ImageView show;
private boolean run = true,click = false;
private Effectstype[] types={Effectstype.Fadein,Effectstype.Fall,Effectstype.Fliph,Effectstype.Flipv,
Effectstype.Newspager,Effectstype.RotateBottom,Effectstype.RotateLeft,Effectstype.Shake,
Effectstype.Sidefill,Effectstype.SlideBottom,Effectstype.Slideright,Effectstype.Slidetop,Effectstype.Slideleft,
Effectstype.Slit};
private int[] imgs={R.mipmap.n1,R.mipmap.n2,R.mipmap.n3,R.mipmap.n4,R.mipmap.n5
,R.mipmap.car2,R.mipmap.car3,R.mipmap.car4,R.mipmap.mouth};
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
start(msg.arg1,5000,msg.what);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pic_and_mus);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

show = (ImageView) findViewById(R.id.iv);
show.setClickable(true);
show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (click){
return;
}
click =true;
Intent intent = new Intent(getBaseContext(),PhotoMoveService.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startService(intent);
start(6,5000,6);
PhotoMoveService.setMusicStop(PicAndMusActivity.this);
new Thread(new ImgNext()).start();
}
});

}
private void start(int which,int mDuration,int img) {
Log.d("===whice>:",which+"");
show.setImageResource(imgs[img]);
BaseEffects animator = types[which].getAnimator();
if (mDuration != -1) {
animator.setDuration(Math.abs(mDuration));
}
animator.start(show);
}

@Override
public void music() {
run = false;
}

public class ImgNext implements Runnable {

@Override
public void run() {
int i= 0,which= 0;
while (i < imgs.length && run){
if (which == types.length-1){
which = 0;
}
if (i == imgs.length-1){
i = 0;
}
try {
Thread.sleep(5000);
Message message = new Message();
message.what =i++;
message.arg1 = which++;
handler.sendMessage(message);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (!run){
Message message = new Message();
message.what =imgs.length-1;
message.arg1 = types.length-1;
handler.sendMessage(message);
}
}
}

@Override
protected void onDestroy() {
super.onDestroy();
Intent intent = new Intent(getBaseContext(),PhotoMoveService.class);
stopService(intent);
}
}</span>

2.音乐播放的Services

<span style="font-size:18px;">public class PhotoMoveService extends Service {
private static Music musicStop;
private MediaPlayer player;
public PhotoMoveService() {
}

@Override
public void onCreate() {
super.onCreate();
player=MediaPlayer.create(this,R.raw.nba);
stopMusic();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
player.start();
return super.onStartCommand(intent, flags, startId);
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
public static void setMusicStop(Context context){
musicStop = (Music) context;
}

public interface Music{
public void music();
}
public void stopMusic(){
player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
musicStop.music();
}
});
}
}</span>

3.完成以上步骤就可以看到带有图片滚动的简单播放器了。