发表了主题帖： AndroidBLE_osc_申请权限

这个软件的功能是通过蓝牙接收温度数据并绘制温度变化曲线 # 1.获取权限 安卓的BLE需要在AndroidManifest.xml里声明需要的权限。包括蓝牙权限，定位权限，在安卓12以后又增加了一些权限 ```xml ``` # 2.动态申请 其中定位权限以及安卓12新增权限需要动态申请。因此下面需要在MainActivity里申请权限 ```java protected void onResume() { super.onResume(); if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION); } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: { if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { // Permission was granted, start scanning Toast.makeText(this, "已授予许可", Toast.LENGTH_SHORT).show(); } else { // Permission denied, show a message Log.w("permission","Location permission is required to scan for BLE devices"); Toast.makeText(this, "Location permission is required to scan for BLE devices", Toast.LENGTH_SHORT).show(); finish(); } return; } } } ``` 其中onResume方法绘制主界面显示之前就区申请权限，onRequestPermissionsResult方法处理相关权限申请失败/成功后内容例如向用户提示申请成功/失败。 这是onResume方法返回的权限请求码，onRequestPermissionsResult通过请求码来处理响应的权限申请结果。 ``` private static final int REQUEST_ENABLE_BT = 1; private static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1; ``` # 3.主函数需要判断设备是否支持BLE，蓝牙是否打开 ```java final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); if (mBluetoothAdapter == null) { Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_SHORT).show(); finish(); return; } if (!mBluetoothAdapter.isEnabled()) { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } ```