How permission can be checked at runtime without throwing SecurityException

Question

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

User · Accepted Answer

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

User · Answer

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  gt  0                      amp  amp  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

User · Answer

if   ContextCompat checkSelfPermission MainActivity this  Manifest permission READ EXTERNAL STORAGE     PackageManager PERMISSION GRANTED   amp  amp   ContextCompat checkSelfPermission MainActivity this  Manifest permission WRITE EXTERNAL STORAGE     PackageManager PERMISSION GRANTED   amp  amp   ContextCompat checkSelfPermission MainActivity this  Manifest permission CAMERA     PackageManager PERMISSION GRANTED          if  Build VERSION SDK INT  gt   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

User · Answer

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,
        });

User · Answer

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  gt   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  lt  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

User · Answer

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 lt out String gt   grantResults  IntArray            super onRequestPermissionsResult requestCode  permissions  grantResults             if requestCode  0  amp  amp  grantResults 0   PackageManager PERMISSION GRANTED             Do Your Operations Here          ---------- gt

User · Answer

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

User · Answer

You can also use this   private boolean doesUserHavePermission         int result   context checkCallingOrSelfPermission Manifest permission WRITE EXTERNAL STORAGE       return result    PackageManager PERMISSION GRANTED

User · Answer

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

User · Answer

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

User · Answer

Like Google documentation       Assume thisActivity is the current activity int permissionCheck   ContextCompat checkSelfPermission thisActivity  Manifest permission WRITE EXTERNAL STORAGE

[android] How permission can be checked at runtime without throwing SecurityException?

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