android BLE 40 setCharacteristicNotification接收不到數據
阿新 • • 發佈:2017-07-01
isa 接收 otherwise pub param androi lis android detail
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問題描述 最近在開發android BLE 讀寫數據
但是向設備寫數據很順利,但是在接收設備傳來的數據時,死活接收不到.
/** * Enables or disables notification on a give characteristic. * * @param characteristic Characteristic to act on. * @param enabled If true, enable notification. False otherwise. */ public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } mBluetoothGatt.setCharacteristicNotification(characteristic, enabled); }
上面這樣寫 是收不到數據的 ,主要是少加了mBluetoothGatt.writeDescriptor(descriptor);
下面是修改後的代碼
/** * Enables or disables notification on a give characteristic. * * @param characteristic Characteristic to act on. * @param enabled If true, enable notification. False otherwise. */ public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) { if (mBluetoothAdapter == null || mBluetoothGatt == null) { Log.w(TAG, "BluetoothAdapter not initialized"); return; } // mBluetoothGatt.setCharacteristicNotification(characteristic, enabled); boolean isEnableNotification = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled); if(isEnableNotification) { List<BluetoothGattDescriptor> descriptorList = characteristic.getDescriptors(); if(descriptorList != null && descriptorList.size() > 0) { for(BluetoothGattDescriptor descriptor : descriptorList) { descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); mBluetoothGatt.writeDescriptor(descriptor); } } }}
如果 不是這種 情況接收不到數據就是另外一種可能了characteristic的 uuid設置不對
你可以看下 boolean isEnableNotification = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
返回的是false 還是true,
另外還會再寫一篇關於藍牙數據讀寫的文章
以上就介紹了 android BLE 40 setCharacteristicNotification接收不到數據,包括了方面的內容,希望對Android開發有興趣的朋友有所幫助。
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android BLE 40 setCharacteristicNotification接收不到數據