他の断片からBluetoothを制御してください

Question

さて、私はBluetoothで少し助けが必要です。私はJavaで新しいので、4つの異なる部分から同じBluetoothデバイスを渡したり制御したりするのに助けが必要です。私はサービス、スレッド、オブジェクトなどについて何か読んでいますが、もっと理解しやすい方法があると思います...私の最初のアクティビティはMainControlsにデバイスアドレスを送信し、正常に接続しますが、アクセス方法はわかりませんそれは別の断片からです。私のコードが動作している

public class MainControls extends AppCompatActivity { 

/** 
* The {@link android.support.v4.view.PagerAdapter} that will provide 
* fragments for each of the sections. We use a 
* {@link FragmentPagerAdapter} derivative, which will keep every 
* loaded fragment in memory. If this becomes too memory intensive, it 
* may be best to switch to a 
* {@link android.support.v4.app.FragmentStatePagerAdapter}. 
*/ 
private SectionsPagerAdapter mSectionsPagerAdapter; 
public String address; 
String bckg; 
TextView textView; 

private ProgressDialog progress; 
//BLE 
public BluetoothAdapter myBluetooth = null; 
public BluetoothSocket btSocket = null; 
private boolean isBtConnected = false; 

//SPP UUID 
static final UUID myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); 

/** 
* The {@link ViewPager} that will host the section contents. 
*/ 
private ViewPager mViewPager; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main_controls); 
    textView = (TextView)findViewById(R.id.textView); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    Intent i = this.getIntent(); 
    address = i.getStringExtra("addr"); 
    bckg = i.getStringExtra("bckg"); 
    mSectionsPagerAdapter = new 
    SectionsPagerAdapter(getSupportFragmentManager()); 

    // Set up the ViewPager with the sections adapter. 
    mViewPager = (ViewPager) findViewById(R.id.container); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(mViewPager); 

    tabLayout.getTabAt(0).setIcon(R.drawable.led); 
    tabLayout.getTabAt(1).setIcon(R.drawable.sliders); 
    tabLayout.getTabAt(2).setIcon(R.drawable.controller); 
    tabLayout.getTabAt(3).setIcon(R.drawable.wrench); 
    new ConnectBT().execute(); 
} 



public boolean onCreateOptionsMenu(Menu menu) { 

    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.my_options, menu); 
    return true; 
} 

public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.about) 
    { 
     //return true; 
    } 

    if (id == R.id.info) 
    { 
     //return true; 
    } 

    if (id == R.id.nastavenia) 
    { 
     //return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

    /** 
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
* one of the sections/tabs/pages. 
*/ 
public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     switch (position) { 
      case 0: 
       tab1Led tab1 = new tab1Led(); 
       return tab1; 
      case 1: 
       tab2Sliders tab2 = new tab2Sliders(); 
       return tab2; 
      case 2: 
       tab3Controller tab3 = new tab3Controller(); 
       return tab3; 
      case 3: 
       tab4Custom tab4 = new tab4Custom(); 
       return tab4; 
      default: 
       return null; 
     } 
    } 

    @Override 
    public int getCount() { 
     // Show 3 total pages. 
     return 4; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     switch (position) { 
      case 0: 
       return "Led"; 
      case 1: 
       return "Sliders"; 
      case 2: 
       return "Controller"; 
      case 3: 
       return "Custom"; 
     } 
     return null; 
    } 
} 

private void msg(String s){ 
    Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show(); 
} 


/*Bluetooth class 
* 
* 
*/ 
public class ConnectBT extends AsyncTask<Void, Void, Void> // UI thread 
{ 
    private boolean ConnectSuccess = true; 
    @Override 
    protected void onPreExecute() 
    { 
     progress = ProgressDialog.show(MainControls.this, "Connecting...", 
"Please wait!!!"); //show a progress dialog 
    } 
    @Override 
    protected Void doInBackground(Void... devices) //while the progress 
dialog is shown, the connection is done in background 
    { 
     try 
     { 
      if (btSocket == null || !isBtConnected) 
      { 
       myBluetooth = BluetoothAdapter.getDefaultAdapter(); 
       BluetoothDevice btDevice = 
myBluetooth.getRemoteDevice(address); 
       btSocket = 
btDevice.createInsecureRfcommSocketToServiceRecord(myUUID); 
       BluetoothAdapter.getDefaultAdapter().cancelDiscovery(); 
       btSocket.connect(); 
      } 
     } 
     catch (IOException e) 
     { 
      ConnectSuccess = false; 
     } 
     return null; 
    } 
    @Override 
    protected void onPostExecute(Void result) 
    { 
     super.onPostExecute(result); 

     if (!ConnectSuccess) 
     { 
      msg("Connection Failed. Try again."); 
      Intent i = new Intent(MainControls.this, DeviceSearch.class); 
      startActivity(i); 
     } 
     else { 
      msg("Successfully Connected."); 
      isBtConnected = true; 

     } 
     progress.dismiss(); 
    } 
} 
/*Bluetooth class 
* 
* 
*/ 
} 

、私のすべてのフラグメントが一緒に働くと私はエラーを得なかっ：

はここに私のメインの断片です。私はここで

がtab1Ledされ...私は をしたいしかし、私は別のフラグメントからアクセスしたいときに問題が起動デバイスに正常に接続、私の最初のフラグメント：

public class tab1Led extends Fragment 
{ 
public String address; 
public int bckg; 
TextView status, delayTextView; 
int count, delay; 
private SeekBar delaySeek; 

public BluetoothAdapter myBluetooth; 
public BluetoothSocket btSocket = null; 

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN) 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) 
{ 
    final Context context = getActivity().getApplicationContext(); 
    //JJ 


    View view = inflater.inflate(R.layout.led, container, false); 
    TextView textView = (TextView)view.findViewById(R.id.textView); 

    delayTextView = (TextView)view.findViewById(R.id.delayTextView); 
    status     = (TextView)view.findViewById(R.id.status); 
    bckg = getActivity().getIntent().getExtras().getInt("bckg"); 
    address = getActivity().getIntent().getExtras().getString("addr"); 
    delaySeek = (SeekBar)view.findViewById(R.id.delaySeek); 

    if(bckg == 0){ 
     textView.setText("Selected background: dark \n" + address); 
    } 
    else if(bckg == 1){ 
     textView.setText("Selected background: light \n" + address); 
    } 
    else{ 
     textView.setText("Error"); 
    } 

    count = 0; 
    delay = 250; 
    delaySeek.setProgress(250); 
    delayTextView.setText("Delay: " + String.valueOf(delay) + "ms"); 
    ImageButton imageButton = (ImageButton) 
    view.findViewById(R.id.imageButton); 


    delaySeek.setOnSeekBarChangeListener(new 
    SeekBar.OnSeekBarChangeListener() { 
     int progressChangedValue = 0; 

     public void onProgressChanged(SeekBar seekBar, int progress, 
    boolean fromUser) { 
      progressChangedValue = progress; 
      delay = delaySeek.getProgress(); 
      delayTextView.setText("Delay: " + String.valueOf(delay) + 
    "ms"); 
     } 

     public void onStartTrackingTouch(SeekBar seekBar) { 
      delay = delaySeek.getProgress(); 
      delayTextView.setText("Delay: " + String.valueOf(delay) + 
    "ms"); 
     } 

     public void onStopTrackingTouch(SeekBar seekBar) { 
      delay = delaySeek.getProgress(); 
      delayTextView.setText("Delay: " + String.valueOf(delay) + 
    "ms"); 
     } 
    }); 

    imageButton.setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     public void onClick(View v) 
     { 
      if(count == 0){ 
       status.setText("LED is: OFF"); 
       count++; 
      } 
      else if(count == 1){ 
       status.setText("LED is: ON"); 
       count--; 
      } 

      else { 
       count = 0; 
      } 
     } 
    }); 



    return view; 

} 

private void msg(String s){ 
    Toast.makeText(getContext(), s, Toast.LENGTH_SHORT).show(); 
} 

} 

オーケー、私が持っているので、すべての準備ができて、ボタンがオフのときにcharを送信し、ボタンがオンのときにcharを送信する必要がありますが、Bluetoothデバイスにアクセスするだけで問題はありません。助けてくれてありがとう:)

Answer 1

あなたのBluetoothコントロールdefenitlyより多くの制御のためにスレッドにする必要があります。

ここでは、Bluetooth接続を実装する方法の例を示します。sendToTargetというメソッドは、ブルートゥースからUIアクティビティまたはフラグメントにデータを送信することを担当します。

public class MyBluetoothService { 
private static final String TAG = "MY_APP_DEBUG_TAG"; 
private Handler mHandler; // handler that gets info from Bluetooth service 

// Defines several constants used when transmitting messages between the 
// service and the UI. 
private interface MessageConstants { 
    public static final int MESSAGE_READ = 0; 
    public static final int MESSAGE_WRITE = 1; 
    public static final int MESSAGE_TOAST = 2; 

    // ... (Add other message types here as needed.) 
} 

private class ConnectedThread extends Thread { 
    private final BluetoothSocket mmSocket; 
    private final InputStream mmInStream; 
    private final OutputStream mmOutStream; 
    private byte[] mmBuffer; // mmBuffer store for the stream 

    public ConnectedThread(BluetoothSocket socket) { 
     mmSocket = socket; 
     InputStream tmpIn = null; 
     OutputStream tmpOut = null; 

     // Get the input and output streams; using temp objects because 
     // member streams are final. 
     try { 
      tmpIn = socket.getInputStream(); 
     } catch (IOException e) { 
      Log.e(TAG, "Error occurred when creating input stream", e); 
     } 
     try { 
      tmpOut = socket.getOutputStream(); 
     } catch (IOException e) { 
      Log.e(TAG, "Error occurred when creating output stream", e); 
     } 

     mmInStream = tmpIn; 
     mmOutStream = tmpOut; 
    } 

    public void run() { 
     mmBuffer = new byte[1024]; 
     int numBytes; // bytes returned from read() 

     // Keep listening to the InputStream until an exception occurs. 
     while (true) { 
      try { 
       // Read from the InputStream. 
       numBytes = mmInStream.read(mmBuffer); 
       // Send the obtained bytes to the UI activity. 
       Message readMsg = mHandler.obtainMessage(
         MessageConstants.MESSAGE_READ, numBytes, -1, 
         mmBuffer); 
       readMsg.sendToTarget(); 
      } catch (IOException e) { 
       Log.d(TAG, "Input stream was disconnected", e); 
       break; 
      } 
     } 
    } 

    // Call this from the main activity to send data to the remote device. 
    public void write(byte[] bytes) { 
     try { 
      mmOutStream.write(bytes); 

      // Share the sent message with the UI activity. 
      Message writtenMsg = mHandler.obtainMessage(
        MessageConstants.MESSAGE_WRITE, -1, -1, mmBuffer); 
      writtenMsg.sendToTarget(); 
     } catch (IOException e) { 
      Log.e(TAG, "Error occurred when sending data", e); 

      // Send a failure message back to the activity. 
      Message writeErrorMsg = 
        mHandler.obtainMessage(MessageConstants.MESSAGE_TOAST); 
      Bundle bundle = new Bundle(); 
      bundle.putString("toast", 
        "Couldn't send data to the other device"); 
      writeErrorMsg.setData(bundle); 
      mHandler.sendMessage(writeErrorMsg); 
     } 
    } 

    // Call this method from the main activity to shut down the connection. 
    public void cancel() { 
     try { 
      mmSocket.close(); 
     } catch (IOException e) { 
      Log.e(TAG, "Could not close the connect socket", e); 
     } 
    } 
} 

}