在Android Studio API 32中,RequestPermissions可能不会在应用程序中弹出提示,这可能是由于对权限的访问被彻底限制所致。为了解决这个问题,你可以手动在应用程序的设置中打开所需的权限。
以下是一个代码示例,展示了如何在需要的情况下正确处理权限请求:
首先,在AndroidManifest.xml中声明所需的权限,如下所示:
在Activity中,检查是否有所需的权限。如果没有,请求权限:
int PERMISSIONS_REQUEST_CAMERA = 0;
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},
PERMISSIONS_REQUEST_CAMERA);
// PERMISSIONS_REQUEST_CAMERA is an
// app-defined int constant. The callback method gets the
// result of the request.
}
} else { // Permission has already been granted }
最后,在Activity中覆盖onRequestPermissionsResult()方法,以处理用户的响应:
@Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case 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