底層的驅動代碼和相關的DTS文件都已經配置好了，開始實現應用的代碼了，我們先來實現音樂播放器的基礎功能。
實現一個音樂播放器，可以直接掃描板子上的所有音樂並列出歌曲清單，同時可以控制進行音樂播放、停止、上一首、下一首。
public class MainActivity extends Activity implements View.OnClickListener {
private Button puase, stop, last, next;
private RadioButton start;
private ListView listView;
private TextView totle, current_time;
private SeekBar progressBar;
public final static int PLAY = 1;
public final static int STOP = 2;
public final static int NEXT = 3;
public final static int LAST = 4;
private ArrayList<String> save;
private PlayMusicBackgoundService service;
private ServiceConnection connection;
private boolean isstart = true;
private Timer timer;
private int onplay = 0;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
SimpleDateFormat format = new SimpleDateFormat("mm:ss");
progressBar.setMax(msg.arg1);
progressBar.setProgress(msg.arg2);
totle.setText(format.format(msg.arg1));
current_time.setText(format.format(msg.arg2));
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initvariable();
request();
timer = new Timer();
scanFile();
}
private void request() {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
}
private void initvariable() {
start = findViewById(R.id.start);
last = findViewById(R.id.last);
next = findViewById(R.id.next);
listView = findViewById(R.id.music);
totle = findViewById(R.id.count_time);
current_time = findViewById(R.id.current_time);
progressBar = findViewById(R.id.advance);
start.setOnClickListener(this);
last.setOnClickListener(this);
next.setOnClickListener(this);
save = new ArrayList<>();
Intent intent = new Intent();
intent.setAction("android.intent.action.BUND");
intent.setPackage("com.thundersoft.boardapk");
intent.putExtra("all", save);
connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
service = (PlayMusicBackgoundService) ((PlayMusicBackgoundService.MyServices) iBinder).getServices();
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
}
};
bindService(intent, connection, BIND_AUTO_CREATE);
}
private void scanFile() {
save.removeAll(save);
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Song";
File file = new File(path);
for (File file1 : file.listFiles()) {
if (file1.getName().endsWith(".mp3")) {
save.add(file1.getName());
}
}
ListAdapter adapter = new ListAdapter(save, this);
listView.setAdapter(adapter);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.start:
if (isstart) {
start.setText("Pause");
isstart = false;
}
break;
case R.id.last:
if (onplay == 0) {
action(LAST, save.get(save.size() - 1));
onplay=save.size() - 1;
} else {
Log.i("LAST",onplay+"");
action(LAST, save.get(onplay -1));
onplay=onplay-1;
}
getdataback();
start.setText("Pause");
isstart=false;
break;
case R.id.next:
if (onplay == (save.size() - 1)) {
action(NEXT, save.get(0));
onplay=0;
Log.i("onlpay",""+onplay);
} else {
action(NEXT, save.get(onplay + 1));
onplay=onplay+1;
}
getdataback();
start.setText("Pause");
isstart=false;
break;
}
}
private void getdataback() {
service.setCallback(new PlayMusicBackgoundService.Callback() {
@Override
public void get(int time, int current) {
Message message = new Message();
message.arg1 = time;
message.arg2 = current;
handler.sendMessage(message);
Log.i("FUCK", "PLAY");
}
});
}
public void action(int action, String path) {
Intent intent = new Intent(this, PlayMusicBackgoundService.class);
intent.putExtra("action", action);
intent.putExtra("path", path);
startService(intent);
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == 1) {
scanFile();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unbindService(connection);
}
}
再來實現音樂播放器的後臺播放功能
public class PlayMusicBackgoundService extends Service {
private MediaPlayer mediaPlayer;
private boolean isStop = true;
private Callback callback;
private Handler handler;
private int current, count;
public boolean ispause = false;
private Timer timer;
public ArrayList<String> list;
public void setCallback(Callback callback) {
this.callback = callback;
}
@Override
public IBinder onBind(Intent intent) {
list=intent.getStringArrayListExtra("all");
return new MyServices();
}
@Override
public void onCreate() {
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null) {
int action = intent.getIntExtra("action", 0);
switch (action) {
case MainActivity.PLAY:
if (isStop) {
if (!ispause) {
mediaPlayer = MediaPlayer.create(this, Uri.parse("file://" + Environment.getExternalStorageDirectory().getPath() + "/Song/" + intent.getStringExtra("path")));
}
Log.i("Media", mediaPlayer + "");
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
count = mediaPlayer.getDuration();
current = mediaPlayer.getCurrentPosition();
callback.get(count, current);
}
}, 0, 1000);
mediaPlayer.start();
isStop = false;
} else if (!isStop && mediaPlayer.isPlaying() && mediaPlayer != null) {
timer.cancel();
mediaPlayer.pause();
isStop = true;
ispause = true;
}
break;
case MainActivity.STOP:
if (!isStop) {
mediaPlayer.stop();
mediaPlayer.release();
isStop = true;
}
break;
case MainActivity.NEXT:
if (mediaPlayer!=null){
mediaPlayer.reset();
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer=null;
}
mediaPlayer=MediaPlayer.create(this,Uri.parse("file://" + Environment.getExternalStorageDirectory().getPath() + "/Song/" + intent.getStringExtra("path")));
Log.i("NEXT",intent.getStringExtra("path"));
mediaPlayer.start();
Timer timenext = new Timer();
timenext.schedule(new TimerTask() {
@Override
public void run() {
Log.i("MEDIA",mediaPlayer+"");
count = mediaPlayer.getDuration();
current = mediaPlayer.getCurrentPosition();
callback.get(count, current);
}
}, 0, 1000);
isStop=false;
break;
case MainActivity.LAST:
if (mediaPlayer!=null){
mediaPlayer.reset();
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer=null;
}
mediaPlayer=MediaPlayer.create(this,Uri.parse("file://" + Environment.getExternalStorageDirectory().getPath() + "/Song/" + intent.getStringExtra("path")));
Log.i("LAST",intent.getStringExtra("path"));
mediaPlayer.start();
Timer timelast = new Timer();
timelast.schedule(new TimerTask() {
@Override
public void run() {
count = mediaPlayer.getDuration();
current = mediaPlayer.getCurrentPosition();
callback.get(count, current);
}
}, 0, 1000);
isStop=false;
break;
}
}
return super.onStartCommand(intent, flags, startId);
}
public class MyServices extends Binder {
public Service getServices() {
return PlayMusicBackgoundService.this;
}
}
public interface Callback {
public void get(int time, int current);
}
}
