Android蓝牙连接SPP后断开会出现IOException异常

2015-10-31 01:40:49 480 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Android蓝牙连接兼容旧版本：从权限到扫描连接的完整避坑指南 Android蓝牙开发涉及经典蓝牙和BLE两套协议栈，从权限管理、设备扫描到Socket连接，每个环节都因系统版本差异而有不同行为。Android 6.0引入运行时权限后，蓝牙扫描需要定位权限；Android 12又将蓝牙权限拆分为BLUETOOTH_SCAN和BLUETOOTH_CONNECT，且受targetSdk影响。通过合理设置minSdk与targetSdk、封装统一权限Helper，并针对经典蓝牙和BLE分别采用对应API，可以显著提升App在不同Android版本上的兼容性。这种实践尤其适用于阅读详情

Android蓝牙连接SPP后断开会出现IOException异常， log如下



E/BluetoothSocket(5549): java.io.IOException: Operation Canceled

E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothSocket.readNative(Native Method)

E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothSocket.read(BluetoothSocket.java:386)

E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothInputStream.read(BluetoothInputStream.java:96)

E/BluetoothSocket(5549): 	at java.io.InputStream.read(InputStream.java:163)

E/BluetoothSocket(5549): 	at com.adayome.hudsettingdemo.bt.BluetoothConnection$5.run(BluetoothConnection.java:335)

整个逻辑是这样的，连接SPP后，开启一个线程一直在read数据，



private class readThread extends Thread {

		public void run() {



			byte[] buffer = new byte[1024];

			int bytes;

			InputStream mmInStream = null;

			try {

				mmInStream = GlobalVariables.sSocket.getInputStream();

			} catch (IOException e1) {

				// TODO Auto-generated catch block

				e1.printStackTrace();

			}

			while (!isInterrupted()) {

				try {

					// Read from the InputStream

					if ((bytes = mmInStream.read(buffer)) > 0) {



						byte[] buf_data = new byte[bytes];

						for (int i = 0; i < bytes; i++) {

							buf_data[i] = buffer[i];

						}

						String s = new String(buf_data);

						LogUtils.i("readThread---------------2 s = " + s);

						if (s.trim().equals("exit"))

							break;

						Message msg = new Message();

						msg.obj = s;

						msg.what = 1;

						LinkDetectedHandler.sendMessage(msg);

					}

				} catch (IOException e) {

					try {

						mmInStream.close();

					} catch (IOException e1) {

						// TODO Auto-generated catch block

						e1.printStackTrace();

					}

					break;

				}

			}

		}

	}

在退出时会中断这个线程和关闭相应的Socket



if (mReadThread != null) {

			mReadThread.interrupt();

			mReadThread = null;

		}



		if (GlobalVariables.sSocket != null) {

			try {

				InputStream in = GlobalVariables.sSocket.getInputStream();

				OutputStream ou = GlobalVariables.sSocket.getOutputStream();

				

				ou.close();

				in.close();

				GlobalVariables.sSocket.close();



			} catch (IOException e) {

				LogUtils.debugLog(e);

			}



			GlobalVariables.sSocket = null;

		}