Android12.0 蓝牙默认配对无弹窗实现

Android系统在收到蓝牙配对请求时，会触发BluetoothDevice.ACTION_PAIRING_REQUEST广播，并通过BluetoothPairingRequest.java类处理弹窗逻辑。弹窗显示的逻辑位于BluetoothPairingDialog.java，需通过修改相关代码跳过弹窗，直接完成配对。

关键修改点

• 拦截配对请求：在BluetoothPairingRequest的onReceive方法中，直接调用设备确认配对的逻辑，而非启动弹窗Activity。

• 处理不同配对类型：根据配对请求的类型（如PIN码输入、确认配对等），自动填充或确认配对参数。

具体修改

• /packages/apps/Settings/src/com/android/settings/bluetooth/BluetoothPairingRequest.java

public final class BluetoothPairingRequest extends BroadcastReceiver {
	// add start
	private static int mType = 0; 
  	private BluetoothDevice mDevice;
	// 直接执行配对确认逻辑
  	private void autoPair(int value) {
    	switch (mType) {
        	case BluetoothDevice.PAIRING_VARIANT_PIN: // 需要输入PIN码的情况
            	byte[] pin= {0,1,2,3};
            	mDevice.setPin(pin);
            	break;
        	case BluetoothDevice.PAIRING_VARIANT_PASSKEY_CONFIRMATION: // 需要用户确认的情况
        	case BluetoothDevice.PAIRING_VARIANT_CONSENT:
            	mDevice.setPairingConfirmation(true);
            	break;
        	case BluetoothDevice.PAIRING_VARIANT_DISPLAY_PASSKEY:
        	case BluetoothDevice.PAIRING_VARIANT_DISPLAY_PIN:
        	case BluetoothDevice.PAIRING_VARIANT_PASSKEY:
        	case BluetoothDevice.PAIRING_VARIANT_OOB_CONSENT:
            	// Do nothing.
            	break;
        	default:
            	Log.e("autoPair", "Incorrect pairing type received");
    	}
  	}
  	// add end
  	
  	@Override
   	public void onReceive(Context context, Intent intent) {
     	String action = intent.getAction();
     	if (action == null || !action.equals(BluetoothDevice.ACTION_PAIRING_REQUEST)) {
       	return;
     	}
     	// convert broadcast intent into activity intent (same action string)
     	Intent pairingIntent = BluetoothPairingService.getPairingDialogIntent(context, intent);

     	PowerManager powerManager =
         	(PowerManager)context.getSystemService(Context.POWER_SERVICE);
     	BluetoothDevice device =
         	intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
		
		// add start
     	int type = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_VARIANT,
           	BluetoothDevice.ERROR);
     	int pairingKey = intent.getIntExtra(BluetoothDevice.EXTRA_PAIRING_KEY,
           	BluetoothDevice.ERROR);
     	mType = type;
     	mDevice = device;  
     	autoPair(pairingKey);
     	// add end

     	String deviceAddress = device != null ? device.getAddress() : null;
     	String deviceName = device != null ? device.getName() : null;
     	boolean shouldShowDialog = LocalBluetoothPreferences.shouldShowDialogInForeground(
         	context, deviceAddress, deviceName);
     	if (powerManager.isInteractive() && shouldShowDialog) {
       		// Since the screen is on and the BT-related activity is in the foreground,
       		// just open the dialog
       		// add start
       		//context.startActivityAsUser(pairingIntent, UserHandle.CURRENT);
       		// add end
     	} else {
       		// Put up a notification that leads to the dialog
       		intent.setClass(context, BluetoothPairingService.class);
       		context.startServiceAsUser(intent, UserHandle.CURRENT);
     	}
   	}
}