基于Dragonboard410c的智能音箱（四）
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底层的驱动代码和相关的DTS文件都已经配置好了，开始实现应用的代码了，我们先来实现音乐播放器的基础功能。
实现一个音乐播放器，可以直接扫描板子上的所有音乐并列出歌曲清单，同时可以控制进行音乐播放、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); }}再来实现音乐播放器的后台播放功能
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); }}阅读全文
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- 基于Dragonboard410c的智能音箱（四）
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