android 判断是否连接钢琴和检测钢琴是哪个按键
16lz
2021-01-23
public class TaskMiActivity extends AppCompatActivity { // private MidiPianoLayout midiPianoLayout; TextView tv_tv1, tv_tv2; Button btn_connect; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_task_mi); tv_tv1 = findViewById(R.id.tv_tv1); tv_tv2 = findViewById(R.id.tv_tv2); fl_key = findViewById(R.id.fl_key); btn_connect = findViewById(R.id.btn_connect); btn_connect.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { openMidi(); } }); } void openMidi() { MidiManager m = (MidiManager) getSystemService(Context.MIDI_SERVICE); MidiDeviceInfo[] infos = m.getDevices(); if (infos != null && infos.length > 0) { int num = 0; for (int i = 0; i < infos.length; i++) { if (infos[i].getOutputPortCount() != 0) { num = i; } } m.openDevice(infos[num], new MidiManager.OnDeviceOpenedListener() { @Override public void onDeviceOpened(MidiDevice device) { if (device == null) { Toast.makeText(getBaseContext(), "连接设备失败", Toast.LENGTH_SHORT).show(); } else { MidiDeviceInfo.PortInfo[] ports = device.getInfo().getPorts(); for (int j = 0; j < ports.length; j++) { if (ports[j].getType() == MidiDeviceInfo.PortInfo.TYPE_OUTPUT) { int outputNum = ports[j].getPortNumber(); MidiOutputPort midiOutputPort = device.openOutputPort(outputNum); if (midiOutputPort != null) { midiOutputPort.connect(new MyReceiver()); Toast.makeText(getBaseContext(), "连接设备成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getBaseContext(), "连接设备失败", Toast.LENGTH_SHORT).show(); } } } } } }, new Handler(Looper.getMainLooper())); } } class MyReceiver extends MidiReceiver { public void onSend(final byte[] data, final int offset, final int count, final long timestamp) throws IOException { runOnUiThread(new Runnable() { @Override public void run() { if (count == 3) { int jw = data[2]; tv_tv1.setText("键位:" + jw + "-------" + data[3] + " -----" + offset + " -----" + count + " ---------" + timestamp); Log.e("ContentValues", "键位:" + jw); Log.e("ContentValues", "力道:" + data[3]); Log.e("ContentValues", "count:" + count); Log.e("ContentValues", "offset:" + offset); Log.e("ContentValues", "timestamp:" + timestamp); StringBuffer sb = new StringBuffer(); for (int i = 0; i < data.length; i++) { sb.append("key:" + i + "<-->"); sb.append("value:" + data[i]); } tv_tv2.setText("-----" + "所有数据:" + sb.toString()); } } }); } }}