Android Runtime Permissions in API-23 + Include all permission-related code to an abstract base class and extend the activity of this base class to achieve cleaner/reusable code
Example
public abstract class BaseActivity extends AppCompatActivity {
private Map<Integer, PermissionCallback> permissionCallbackMap = new HashMap<>();
@Override
protected void onStart() {
super.onStart();
...
}
@Override
public void setContentView(int layoutResId) {
super.setContentView(layoutResId);
bindViews();
}
...
@Override
public void onRequestPermissionsResult(
int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
PermissionCallback callback = permissionCallbackMap.get(requestCode);
if (callback == null) return;
// Check whether the permission request was rejected.
if (grantResults.length < 0 && permissions.length > 0) {
callback.onPermissionDenied(permissions);
return;
}
List<String> grantedPermissions = new ArrayList<>();
List<String> blockedPermissions = new ArrayList<>();
List<String> deniedPermissions = new ArrayList<>();
int index = 0;
for (String permission : permissions) {
List<String> permissionList = grantResults[index] == PackageManager.PERMISSION_GRANTED
? grantedPermissions
: ! ActivityCompat.shouldShowRequestPermissionRationale(this, permission)
? blockedPermissions
: deniedPermissions;
permissionList.add(permission);
index ++;
}
if (grantedPermissions.size() > 0) {
callback.onPermissionGranted(
grantedPermissions.toArray(new String[grantedPermissions.size()]));
}
if (deniedPermissions.size() > 0) {
callback.onPermissionDenied(
deniedPermissions.toArray(new String[deniedPermissions.size()]));
}
if (blockedPermissions.size() > 0) {
callback.onPermissionBlocked(
blockedPermissions.toArray(new String[blockedPermissions.size()]));
}
permissionCallbackMap.remove(requestCode);
}
/**
* Check whether a permission is granted or not.
*
* @param permission
* @return
*/
public boolean hasPermission(String permission) {
return ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED;
}
/**
* Request permissions and get the result on callback.
*
* @param permissions
* @param callback
*/
public void requestPermission(String [] permissions, @NonNull PermissionCallback callback) {
int requestCode = permissionCallbackMap.size() + 1;
permissionCallbackMap.put(requestCode, callback);
ActivityCompat.requestPermissions(this, permissions, requestCode);
}
/**
* Request permission and get the result on callback.
*
* @param permission
* @param callback
*/
public void requestPermission(String permission, @NonNull PermissionCallback callback) {
int requestCode = permissionCallbackMap.size() + 1;
permissionCallbackMap.put(requestCode, callback);
ActivityCompat.requestPermissions(this, new String[] { permission }, requestCode);
}
}
Example usage in the activity
The activity should extend the abstract base class defined above as follows:
private void requestLocationAfterPermissionCheck() {
if (hasPermission(Manifest.permission.ACCESS_FINE_LOCATION)) {
requestLocation();
return;
}
// Call the base class method.
requestPermission(Manifest.permission.ACCESS_FINE_LOCATION, new PermissionCallback() {
@Override
public void onPermissionGranted(String[] grantedPermissions) {
requestLocation();
}
@Override
public void onPermissionDenied(String[] deniedPermissions) {
// Do something.
}
@Override
public void onPermissionBlocked(String[] blockedPermissions) {
// Do something.
}
});
}
