我使用的 android SDK 目标版本是 22 READ_CONTACTS

Question

我用于读取联系人的权限分配清单中的权限。我的问题是我不会将 sdk 版本增加到 23 以向用户显示权限对话框（默认情况下由 android 提供）并获得权限并通过 it.in android SDK 版本 22.

• minSdkVersion = 16 targetSdkVersion = 22 compileSdkVersion = 27

  I am using this code right now.
  
    if (Build.VERSION.SDK_INT >= 23) {
              if (checkPermission()) {
                  Log.e("permission", "Permission already granted.");
              } else {
                  requestPermission();
              }
          }
  
  private boolean checkPermission() {
          int result = ContextCompat.checkSelfPermission(fragmentContext, android.Manifest.permission.READ_CONTACTS);
          if (result == PackageManager.PERMISSION_GRANTED) {
              return true;
          } else {
  
              return false;
          }
      }
  
      private void requestPermission() {
          ActivityCompat.requestPermissions((Activity) fragmentContext, new String[]{android.Manifest.permission.READ_CONTACTS}, REQUEST_READ_CONTACTS);
      }
  
  
   @Override
      public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
          switch (requestCode) {
              case REQUEST_READ_CONTACTS:
                  if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
  
                      Toast.makeText(fragmentContext,
                              "Permission accepted", Toast.LENGTH_LONG).show();
                  } else {
                      Toast.makeText(fragmentContext,
                              "Permission denied", Toast.LENGTH_LONG).show();
  
                  }
                  break;
          }
      }
  

Answer 1

On API 22 and below permissions are already granted if specified in the manifest.

对于 API 23+ ContextCompat#checkSelfPermission 可能有用。它 "degrades" 优雅地出现在较早的 API 秒，如果它出现在清单中，它会告诉您权限已被授予。在 API 23 及更高版本上，它实际上会检查它是否被授予。