问题描述： Android 11上，当用户取消相机权限或访问相机时的权限请求选项后，相机可能无法正常工作。

解决步骤： 1.在AndroidManifest.xml文件中添加相机权限

2.在运行时请求相机权限，并在用户拒绝请求时显示一个对话框来解释为什么需要此权限。 if (ContextCompat.checkSelfPermission(thisActivity, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { // Permission is not granted // Should we show an explanation? if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity, Manifest.permission.CAMERA)) { // Show an explanation to the user asynchronously -- don't block // this thread waiting for the user's response! After the user // sees the explanation, try again to request the permission. } else { // No explanation needed; request the permission ActivityCompat.requestPermissions( thisActivity, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); } } else { // Permission has already been granted // Initialize camera }

3.在 onRequestPermissionsResult() 回调方法中，检查是否授予权限，并根据结果进行适当的操作。 @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_CAMERA: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // permission was granted, yay! Do the // camera-related task you need to do. } else { // permission denied, boo! Disable the // functionality that depends on this permission. } return; } }

4.确保在activity被销毁时释放相机资源。 @Override protected void onDestroy() { releaseCamera(); super.onDestroy(); } private void releaseCamera() { if (mCamera != null) { mCamera.release(); // release