How permission can be checked at runtime without throwing SecurityException?
AndroidSecurityPermissionsRuntimeAndroid Problem Overview
I design a function that may get/set a resource from SD and if not found from sd then take it from Asset and if possible write the asset back to SD
This function may check by method invocation if SD is mounted and accessible...
boolean bSDisAvalaible = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
My designed function may be used from one app(project) to another (with or without android.permission.WRITE_EXTERNAL_STORAGE)
Then I would like to check if the current application has this particular permission without playing with SecurityException.
Does it exist a "nice" way to consult current defined permissions at runtime ?
Android Solutions
Solution 1 - Android
You can use Context.checkCallingorSelfPermission()
function for this. Here is an example:
private boolean checkWriteExternalPermission()
{
String permission = android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
int res = getContext().checkCallingOrSelfPermission(permission);
return (res == PackageManager.PERMISSION_GRANTED);
}
Solution 2 - Android
This is another solution as well
PackageManager pm = context.getPackageManager();
int hasPerm = pm.checkPermission(
android.Manifest.permission.WRITE_EXTERNAL_STORAGE,
context.getPackageName());
if (hasPerm != PackageManager.PERMISSION_GRANTED) {
// do stuff
}
Solution 3 - Android
You can also use this:
private boolean doesUserHavePermission()
{
int result = context.checkCallingOrSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
return result == PackageManager.PERMISSION_GRANTED;
}
Solution 4 - Android
Like Google documentation:
// Assume thisActivity is the current activity
int permissionCheck = ContextCompat.checkSelfPermission(thisActivity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
Solution 5 - Android
Sharing my methods in case someone needs them:
/** Determines if the context calling has the required permission
* @param context - the IPC context
* @param permissions - The permissions to check
* @return true if the IPC has the granted permission
*/
public static boolean hasPermission(Context context, String permission) {
int res = context.checkCallingOrSelfPermission(permission);
Log.v(TAG, "permission: " + permission + " = \t\t" +
(res == PackageManager.PERMISSION_GRANTED ? "GRANTED" : "DENIED"));
return res == PackageManager.PERMISSION_GRANTED;
}
/** Determines if the context calling has the required permissions
* @param context - the IPC context
* @param permissions - The permissions to check
* @return true if the IPC has the granted permission
*/
public static boolean hasPermissions(Context context, String... permissions) {
boolean hasAllPermissions = true;
for(String permission : permissions) {
//you can return false instead of assigning, but by assigning you can log all permission values
if (! hasPermission(context, permission)) {hasAllPermissions = false; }
}
return hasAllPermissions;
}
And to call it:
boolean hasAndroidPermissions = SystemUtils.hasPermissions(mContext, new String[] {
android.Manifest.permission.ACCESS_WIFI_STATE,
android.Manifest.permission.READ_PHONE_STATE,
android.Manifest.permission.ACCESS_NETWORK_STATE,
android.Manifest.permission.INTERNET,
});
Solution 6 - Android
You should check for permissions in the following way (as described here Android permissions):
int result = ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_PHONE_STATE);
then, compare your result to either:
result == PackageManager.PERMISSION_DENIED
or:
result == PackageManager.PERMISSION_GRANTED
Solution 7 - Android
Step 1 - add permission request
String[] permissionArrays = new String[]{Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE};
int REQUEST_CODE = 101;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(permissionArrays, REQUEST_CODE );
} else {
// if already permition granted
// PUT YOUR ACTION (Like Open cemara etc..)
}
}
Step 2 - Handle Permission result
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
boolean openActivityOnce = true;
boolean openDialogOnce = true;
if (requestCode == REQUEST_CODE ) {
for (int i = 0; i < grantResults.length; i++) {
String permission = permissions[i];
isPermitted = grantResults[i] == PackageManager.PERMISSION_GRANTED;
if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
// user rejected the permission
}else {
// user grant the permission
// you can perfome your action
}
}
}
}
Solution 8 - Android
The code which works fine for me is :-
final int MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 102;
if ((ContextCompat.checkSelfPermission(getActivity(),Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE);
} else {
// user already provided permission
// perform function for what you want to achieve
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
boolean canUseExternalStorage = false;
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
canUseExternalStorage = true;
}
if (!canUseExternalStorage) {
Toast.makeText(getActivity(), "Cannot use this feature without requested permission", Toast.LENGTH_SHORT).show();
} else {
// user now provided permission
// perform function for what you want to achieve
}
}
}
}
Solution 9 - Android
if ((ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA},
MY_PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE);
}
}
Solution 10 - Android
Check Permissions In KOTLIN (RunTime)
In Manifest: (android.permission.WRITE_EXTERNAL_STORAGE)
fun checkPermissions(){
var permission_array=arrayOf(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
if((ContextCompat.checkSelfPermission(this,permission_array[0]))==PackageManager.PERMI SSION_DENIED){
requestPermissions(permission_array,0)
}
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if(requestCode==0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
//Do Your Operations Here
---------->
//
}
}
Solution 11 - Android
Enable GPS location Android Studio
- Add permission entry in AndroidManifest.Xml
-
MapsActivity.java
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { private GoogleMap mMap; private Context context; private static final int PERMISSION_REQUEST_CODE = 1; Activity activity; /** * ATTENTION: This was auto-generated to implement the App Indexing API. * See https://g.co/AppIndexing/AndroidStudio for more information. */ private GoogleApiClient client; @Override protected void onCreate(Bundle savedInstanceState) { context = getApplicationContext(); activity = this; super.onCreate(savedInstanceState); requestPermission(); checkPermission(); setContentView(R.layout.activity_maps); // Obtain the SupportMapFragment and get notified when the map is ready to be used. SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() .findFragmentById(R.id.map); mapFragment.getMapAsync(this); } @Override public void onMapReady(GoogleMap googleMap) { mMap = googleMap; LatLng location = new LatLng(0, 0); mMap.addMarker(new MarkerOptions().position(location).title("Marker in Bangalore")); mMap.moveCamera(CameraUpdateFactory.newLatLng(location)); mMap.setMyLocationEnabled(true); } private void requestPermission() { if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.ACCESS_FINE_LOCATION)) { Toast.makeText(context, "GPS permission allows us to access location data. Please allow in App Settings for additional functionality.", Toast.LENGTH_LONG).show(); } else { ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST_CODE); } } private boolean checkPermission() { int result = ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION); if (result == PackageManager.PERMISSION_GRANTED) { return true; } else { return false; } }