Android M onRequestPermissionsResult in non-Activity

Question

I have an application which needs to find the user location, and location is fetched in various classes, so i have written a separate class(Not an Activity class) that fetches user location using location services, it works fine under Android M but requires run time permissions in Android M, i want to check permissions in my Location class and i know how to check them but i cannot use onRequestPermissionsResult method in my Location class, because my Location class do not extends from any activity.

So What i should do for achieving this? any help/clue is appreciated Thanks in advance

Answer 1

Since public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) is an abstract method of ActivityCompat.OnRequestPermissionsResultCallback interface. See the documentation

Just implement this interface in the required class and it's done. For example

class location implements  ActivityCompat.OnRequestPermissionsResultCallback{ }

Now just override onRequestPermissionsResult()

 @Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
     // case Statements
    }
}

Answer 2

You are welcome to call checkSelfPermission() from a non-UI class, as that merely needs some Context.

However, you must call requestPermissions() on some activity or fragment. You override onRequestPermissionsResult() on that same activity or fragment. This is no different than calling startActivityForResult() and implementing onActivityResult().

The idea is that you request the permission before you do anything that involves your non-UI classes that are dealing with locations.

Answer 3

1- create a transparent activity

<activity android:name=".activity.activity.CheckStoragePermissionsActivity" android:theme="@style/Theme.Transparent">

<style name="Theme.Transparent" parent="Theme.AppCompat">
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:backgroundDimEnabled">false</item>
    </style>

2- customize your activity

public class CheckStoragePermissionsActivity extends AppCompatActivity {

    private String[] permissions;
    private int pCode = 12321;
    public static PermissionListener permissionListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        checkPermissions();
    }

    private void checkPermissions() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            permissions = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};

            boolean flag = false;
            for (String s : permissions)
                if (checkSelfPermission(s) != PackageManager.PERMISSION_GRANTED)
                    flag = true;

            if (flag) {
                requestPermissions(permissions, pCode);
            } else {
                permissionListener.permissionResult(true);
                finish();
            }
        }else
            finish();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == pCode) {
            boolean flag = true;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M)
                for (int i = 0, len = permissions.length; i < len; i++)
                    if (grantResults[i] != PackageManager.PERMISSION_GRANTED)
                        flag = false;
            if (flag) {
                if (permissionListener != null)
                    permissionListener.permissionResult(true);
            } else if (permissionListener != null)
                permissionListener.permissionResult(false);
            finish();
        }
    }
}

3- permissionListener is an static interface and can be set directly before context.startActivity(...), or use your plan to found permission result.

public interface PermissionListener extends Serializable {
    void permissionResult(boolean hasPermission);
}

4- finally call context.startActivity(new Intent(context, CheckStoragePermissionsActivity.class));

CheckStoragePermissionsActivity do all of needed and finish after user Allow or Deny action.

Answer 4

You can not override it. This method is only available for Activity and Fragments. But you can create a static method inside your Location class and call it from your activity/fragment's overridden onRequestPermissionResult method.

I have made a custom implementation for Location combined with permission. You can also use a library called Let for permissions.

Answer 5

probably you can create a class that extends Activity (AppCompactActivity is better), implement all needed location code and extends with this class all activities where you need to use it.

Answer 6

use this class :

public class permissionModule {

final public static int STORAGE_PERMISSION_CODE = 23;
private Activity activity;

public permissionModule(Activity activity) {
    this.activity = activity;
}

public void startGetPermission(){
    if (isStorageReadable()){
        Toast.makeText(activity,"you Already have the permission to access storage",Toast.LENGTH_SHORT).show();
    }else {
        requestStoragePermission();
    }
}

private void requestStoragePermission() {
    ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_CODE);
}

private boolean isStorageReadable() {
    int result = ContextCompat.checkSelfPermission(activity, 

Manifest.permission.READ_EXTERNAL_STORAGE);
        return result == PackageManager.PERMISSION_GRANTED;
    }
}

and in your activity call :

new permissionModule(MainActivity.this).startGetPermission();

finally for result , override this in your activity :

@TargetApi(Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == permissionModule.STORAGE_PERMISSION_CODE) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Snackbar permissionWarning = Snackbar.make(rootLayout, "tnk", Snackbar.LENGTH_INDEFINITE);
            permissionWarning.setAction("ok", new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //...
                }
            });
            permissionWarning.show();
        } else {
            boolean showRationale = shouldShowRequestPermissionRationale(Manifest.permission.READ_EXTERNAL_STORAGE);
            if (showRationale) {
                Snackbar permissionWarning = Snackbar.make(rootLayout, "Permission Required to access storage", Snackbar.LENGTH_INDEFINITE);
                permissionWarning.setAction("ok", new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        //requestStoragePermission();
                    }
                });
                permissionWarning.show();
            } else {
                Snackbar snackbar = Snackbar.make(rootLayout, "you denied the permission for ever pleas fix it in setting", Snackbar.LENGTH_INDEFINITE);
                snackbar.setAction("setting", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent = new Intent();
                        intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                        Uri uri = Uri.fromParts("package", MainActivity.this.getPackageName(), null);
                        intent.setData(uri);
                        MainActivity.this.startActivity(intent);
                    }
                });
                snackbar.show();
            }
        }
    }
}