藍牙LE寫入設備

Question

我正在使用一些線上提供的示例來顯示如何寫入設備。我想要做的是加載設備服務和應用程序將數據寫入標記的特徵，而不是打開一個對話框來執行此操作。

任何人都可以對此有所瞭解，因爲我是Android開發新手。

我曾嘗試下面的部分中添加編輯代碼...

private void displayGattServices(List<BluetoothGattService> gattServices) { 

但此行會導致應用程序崩潰...

byte[] bytes = DeviceControlActivity.this.mWriteCharacteristic.getValue(); 

當我試着移動寫部分代碼

public class BleCharacterDialogFragment extends DialogFragment 

因爲我認爲會寫入BLE設備。

所有幫助非常感謝，謝謝。以下是我的代碼。它最初來自https://github.com/suzp1984/Light_BLE。

import android.annotation.TargetApi; 
import android.app.Activity; 
import android.app.Dialog; 
import android.app.DialogFragment; 
import android.app.PendingIntent; 
import android.bluetooth.BluetoothGattCharacteristic; 
import android.bluetooth.BluetoothGattService; 
//import android.content.BroadcastReceiver; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.content.ServiceConnection; 
import android.os.Build; 
import android.os.Bundle; 
import android.os.IBinder; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ExpandableListView; 
import android.widget.SimpleExpandableListAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

import tkr.lightble.utils.Log; 
/** 
* For a given BLE device, this Activity provides the user interface to connect, display data, 
* and display GATT services and characteristics supported by the device. The Activity 
* communicates with {@code BluetoothLeService}, which in turn interacts with the 
* Bluetooth LE API. 
*/ 
public class DeviceControlActivity extends Activity { 

    public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME"; 
    public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS"; 

    private TextView mConnectionState; 
    private TextView mDataField; 
    private TextView mRssiField; 
    private String mDeviceName; 
    private String mDeviceAddress; 
    private ExpandableListView mGattServicesList; 
    private BluetoothLeService mBluetoothLeService; 
    private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = 
      new ArrayList<ArrayList<BluetoothGattCharacteristic>>(); 
    private boolean mConnected = false; 
    private BluetoothGattCharacteristic mNotifyCharacteristic; 
    private BluetoothGattCharacteristic mWriteCharacteristic; 

    private final String LIST_NAME = "NAME"; 
    private final String LIST_UUID = "UUID"; 

    // Code to manage Service lifecycle. 
    private final ServiceConnection mServiceConnection = new ServiceConnection() { 

     @Override 
     public void onServiceConnected(ComponentName componentName, IBinder service) { 
      mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService(); 
      if (!mBluetoothLeService.initialize()) { 
       Log.e("Unable to initialize Bluetooth"); 
       finish(); 
      } 
      // Automatically connects to the device upon successful start-up initialization. 
      mBluetoothLeService.connect(mDeviceAddress); 
      mBluetoothLeService.setBLEServiceCb(mDCServiceCb); 
     } 

     @Override 
     public void onServiceDisconnected(ComponentName componentName) { 
      mBluetoothLeService = null; 
     } 
    }; 

    // If a given GATT characteristic is selected, check for supported features. This sample 
    // demonstrates 'Read' and 'Notify' features. See 
    // http://d.android.com/reference/android/bluetooth/BluetoothGatt.html for the complete 
    // list of supported characteristic features. 
    private final ExpandableListView.OnChildClickListener servicesListClickListner = 
      new ExpandableListView.OnChildClickListener() { 
       @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2) 
       @Override 
       public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, 
              int childPosition, long id) { 
        if (mGattCharacteristics != null) { 
         final BluetoothGattCharacteristic characteristic = 
           mGattCharacteristics.get(groupPosition).get(childPosition); 
         final int charaProp = characteristic.getProperties(); 
         if ((charaProp & BluetoothGattCharacteristic.PROPERTY_READ) > 0) { 
          // If there is an active notification on a characteristic, clear 
          // it first so it doesn't update the data field on the user interface. 
          Log.d("BluetoothGattCharacteristic has PROPERTY_READ, so send read request"); 

          if (mNotifyCharacteristic != null) { 
           mBluetoothLeService.setCharacteristicNotification(
             mNotifyCharacteristic, false); 
           mNotifyCharacteristic = null; 
          } 
          mBluetoothLeService.readCharacteristic(characteristic); 
         } 

         if ((charaProp & BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) { 
          Log.d("BluetoothGattCharacteristic has PROPERTY_NOTIFY, so send notify request"); 

          mNotifyCharacteristic = characteristic; 
          mBluetoothLeService.setCharacteristicNotification(
            characteristic, true); 
         } 

         if (((charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE) | 
           (charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE)) > 0) { 
          Log.d("BluetoothGattCharacteristic has PROPERY_WRITE | PROPERTY_WRITE_NO_RESPONSE"); 

          mWriteCharacteristic = characteristic; 
          // popup an dialog to write something. 
          showCharactWriteDialog(); 
         } 

         return true; 
        } 
        return false; 
       } 
      }; 

    private void showCharactWriteDialog() { 
     DialogFragment newFrame = new BleCharacterDialogFragment(); 
     newFrame.show(getFragmentManager(), "blewrite"); 
    } 

    private void writeCharacteristic(BluetoothGattCharacteristic characteristic) { 
     if (mBluetoothLeService != null) { 
      mBluetoothLeService.writeCharacteristic(characteristic); 
     } 
    } 

    private void clearUI() { 
     mGattServicesList.setAdapter((SimpleExpandableListAdapter) null); 
     mDataField.setText(R.string.no_data); 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.gatt_services_characteristics); 

     final Intent intent = getIntent(); 
     mDeviceName = intent.getStringExtra(EXTRAS_DEVICE_NAME); 
     mDeviceAddress = intent.getStringExtra(EXTRAS_DEVICE_ADDRESS); 

     // Sets up UI references. 
     ((TextView) findViewById(R.id.device_address)).setText(mDeviceAddress); 
     mGattServicesList = (ExpandableListView) findViewById(R.id.gatt_services_list); 
     mGattServicesList.setOnChildClickListener(servicesListClickListner); 
     mConnectionState = (TextView) findViewById(R.id.connection_state); 
     mDataField = (TextView) findViewById(R.id.data_value); 
     mRssiField = (TextView) findViewById(R.id.signal_rssi); 

     getActionBar().setTitle(mDeviceName); 
     getActionBar().setDisplayHomeAsUpEnabled(true); 
     Intent gattServiceIntent = new Intent(this, BluetoothLeService.class); 
     bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     //registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter()); 
     if (mBluetoothLeService != null) { 
      final boolean result = mBluetoothLeService.connect(mDeviceAddress); 
      Log.d("Connect request result=" + result); 
     } 
    } 

    @Override 
    protected void onPause() { 
     super.onPause(); 
     //unregisterReceiver(mGattUpdateReceiver); 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     unbindService(mServiceConnection); 
     mBluetoothLeService = null; 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.gatt_services, menu); 
     if (mConnected) { 
      menu.findItem(R.id.menu_connect).setVisible(false); 
      menu.findItem(R.id.menu_disconnect).setVisible(true); 
     } else { 
      menu.findItem(R.id.menu_connect).setVisible(true); 
      menu.findItem(R.id.menu_disconnect).setVisible(false); 
     } 
     return true; 
    } 

    @TargetApi(Build.VERSION_CODES.ECLAIR) 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch(item.getItemId()) { 
      case R.id.menu_connect: 
       mBluetoothLeService.connect(mDeviceAddress); 
       return true; 
      case R.id.menu_disconnect: 
       mBluetoothLeService.disconnect(); 
       return true; 
      case android.R.id.home: 
       onBackPressed(); 
       return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    private void updateConnectionState(final int resourceId) { 
     runOnUiThread(new Runnable() { 
      @Override 
      public void run() { 
       mConnectionState.setText(resourceId); 
      } 
     }); 
    } 

    private void displayData(String data) { 
     if (data != null) { 
      mDataField.setText(data); 
     } 
    } 

    private void displayRssi(String rssi) { 
     if (rssi != null) { 
      //Log.d("-- dispaly Rssi: " + rssi); 
      mRssiField.setText(rssi); 
     } 
    } 
    // Demonstrates how to iterate through the supported GATT Services/Characteristics. 
    // In this sample, we populate the data structure that is bound to the ExpandableListView 
    // on the UI. 
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2) 
    private void displayGattServices(List<BluetoothGattService> gattServices) { 
     Log.d("displayGATTServices"); 

     if (gattServices == null) return; 
     String uuid = null; 
     String unknownServiceString = getResources().getString(R.string.unknown_service); 
     String unknownCharaString = getResources().getString(R.string.unknown_characteristic); 
     ArrayList<HashMap<String, String>> gattServiceData = new ArrayList<HashMap<String, String>>(); 
     ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData 
       = new ArrayList<ArrayList<HashMap<String, String>>>(); 
     mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>(); 

     // Loops through available GATT Services. 
     for (BluetoothGattService gattService : gattServices) { 
      HashMap<String, String> currentServiceData = new HashMap<String, String>(); 
      uuid = gattService.getUuid().toString(); 
      currentServiceData.put(
        LIST_NAME, SampleGattAttributes.lookup(uuid, unknownServiceString)); 
      currentServiceData.put(LIST_UUID, uuid); 
      gattServiceData.add(currentServiceData); 

      ArrayList<HashMap<String, String>> gattCharacteristicGroupData = 
        new ArrayList<HashMap<String, String>>(); 
      List<BluetoothGattCharacteristic> gattCharacteristics = 
        gattService.getCharacteristics(); 
      ArrayList<BluetoothGattCharacteristic> charas = 
        new ArrayList<BluetoothGattCharacteristic>(); 

      // Loops through available Characteristics. 
      for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) { 
       charas.add(gattCharacteristic); 
       HashMap<String, String> currentCharaData = new HashMap<String, String>(); 
       uuid = gattCharacteristic.getUuid().toString(); 
       currentCharaData.put(
         LIST_NAME, SampleGattAttributes.lookup(uuid, unknownCharaString)); 
       currentCharaData.put(LIST_UUID, uuid); 
       gattCharacteristicGroupData.add(currentCharaData); 
      } 
      mGattCharacteristics.add(charas); 
      gattCharacteristicData.add(gattCharacteristicGroupData); 
     } 

     SimpleExpandableListAdapter gattServiceAdapter = new SimpleExpandableListAdapter(
       this, 
       gattServiceData, 
       android.R.layout.simple_expandable_list_item_2, 
       new String[] {LIST_NAME, LIST_UUID}, 
       new int[] { android.R.id.text1, android.R.id.text2 }, 
       gattCharacteristicData, 
       android.R.layout.simple_expandable_list_item_2, 
       new String[] {LIST_NAME, LIST_UUID}, 
       new int[] { android.R.id.text1, android.R.id.text2 } 
     ); 
     mGattServicesList.setAdapter(gattServiceAdapter); 
    } 

    private DCServiceCb mDCServiceCb = new DCServiceCb(); 

    public class DCServiceCb implements BluetoothLeService.BLEServiceCallback { 

     @Override 
     public void displayRssi(final int rssi) { 
      runOnUiThread(new Runnable() { 
           @Override 
           public void run() { 
            DeviceControlActivity.this.displayRssi(String.valueOf(rssi)); 
           } 
          } 
      ); 

     } 

     @Override 
     public void displayData(final String data) { 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        DeviceControlActivity.this.displayData(data); 
       } 
      }); 

     } 

     @Override 
     public void notifyConnectedGATT() { 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        mConnected = true; 
        updateConnectionState(R.string.connected); 
        invalidateOptionsMenu(); 
       } 
      }); 

     } 

     @Override 
     public void notifyDisconnectedGATT() { 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        mConnected = false; 
        updateConnectionState(R.string.disconnected); 
        invalidateOptionsMenu(); 
        clearUI(); 
       } 
      }); 
     } 

     @Override 
     public void displayGATTServices() { 
      Log.d("displayGATTServices."); 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        if (mBluetoothLeService != null) { 
         DeviceControlActivity.this.displayGattServices(
           mBluetoothLeService.getSupportedGattServices()); 
        } 
       } 
      }); 
     } 
    } 

    public class BleCharacterDialogFragment extends DialogFragment { 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
           Bundle savedInstanceState) { 
      View v = inflater.inflate(R.layout.write_charact_dialog, container, false); 
      final EditText ed = (EditText) v.findViewById(R.id.charact_value); 
      Button ok = (Button) v.findViewById(R.id.dialog_confirm); 
      Button cancel = (Button) v.findViewById(R.id.dialog_cancel); 

      ok.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        // write characterist here. 
        String str = ed.getText().toString(); 
        //mWriteCharactristc. 
        byte[] strBytes = str.getBytes(); 
        byte[] bytes; 
        bytes = DeviceControlActivity.this.mWriteCharacteristic.getValue(); 
        //mWriteCharacteristic. 
        if (strBytes == null) { 
         Log.w("Cannot get Value from EditText Widget"); 
         dismiss(); 
         return; 
        } 

        if (bytes == null) { 
         // maybe just write a byte into GATT 
         Log.w("Cannot get Values from mWriteCharacteristic."); 
         dismiss(); 
         return; 
        } else if (bytes.length <= strBytes.length) { 
         for(int i = 0; i < bytes.length; i++) { 
          bytes[i] = strBytes[i]; 
         } 
        } else { 
         for (int i = 0; i < strBytes.length; i++) { 
          bytes[i] = strBytes[i]; 
         } 
        } 


        DeviceControlActivity.this.mWriteCharacteristic.setValue(bytes); 
        DeviceControlActivity.this.writeCharacteristic(
          DeviceControlActivity.this.mWriteCharacteristic 
        ); 
        dismiss(); 
        return; 
       } 
      }); 

      cancel.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        dismiss(); 
       } 
      }); 

      return v; 
     } 

    } 
} 

Answer 1

的值寫入你要知道拖東西

1-服務UUID 2特性UUID

可以讀/自/至特性UUID

寫值的裝置

以下是將示例代碼寫入特性的示例代碼。

public void writeCharacteristic(byte[] value) 
    { 
     BluetoothGattService service = mBluetoothGatt.getService(YOUR_SEVICE_UUID); 
     if (service == null) { 
      System.out.println("service null"); return; 
     } 

     BluetoothGattCharacteristic characteristic = service.getCharacteristic(YOUR_CHARACTERISTIC_UUID); 

     if (characteristic == null) { 
      System.out.println("characteristic null"); return; 
     } 
     characteristic.setValue(value); 
     boolean status = mBluetoothGatt.writeCharacteristic(characteristic); 
     System.out.println("Write Status: " + status); 
    }