How to check permission and request permission in (Easy coding & easy to understand)

Question

I search for Run-Time-Permission in android and I find lots of links but I see there is complex code.

Note: I share my simple code here so it's helpful for a new developer or Fraser. Also, I didn't use any third party library here.

Answer 1

First of all, Write permission in Manifest file(I take some bagic permissions):

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Now I make two methods checkPermission() AND requestPermission() also @Override one method name is onRequestPermissionsResult() this is take care of result.

Now I'll show you how it looks like:

private boolean checkPermission() {
        int internetPermission = ContextCompat.checkSelfPermission(getApplicationContext(), INTERNET);
        int cameraPermission = ContextCompat.checkSelfPermission(getApplicationContext(), CAMERA);
        int readStoragePermission = ContextCompat.checkSelfPermission(getApplicationContext(), READ_EXTERNAL_STORAGE);
        int writeStoragePermission = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);

        return internetPermission == PackageManager.PERMISSION_GRANTED &&
                cameraPermission == PackageManager.PERMISSION_GRANTED &&
                readStoragePermission == PackageManager.PERMISSION_GRANTED &&
                writeStoragePermission == PackageManager.PERMISSION_GRANTED;
    }

You see in above code there is define INTERNET, CAMERA etc.. This is an import by clicking Alt + Enter And it is look like see below code:

import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.INTERNET;
import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;

Now Please see below code of requestPermission() Method :

private void requestPermission() {
        ActivityCompat.requestPermissions(MainActivity.this, new String[]{INTERNET, CAMERA, READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE}, 1);
    }

Now the Last method is onRequestPermissionsResult(). In this method you can see either permission is GRANTED or DENY:

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        switch (requestCode) {

            case 1:
                if (grantResults.length > 0) {
                    boolean internet = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    boolean camera = grantResults[1] == PackageManager.PERMISSION_GRANTED;
                    boolean readStorage = grantResults[2] == PackageManager.PERMISSION_GRANTED;
                    boolean writeStorage = grantResults[3] == PackageManager.PERMISSION_GRANTED;

                    if (internet && camera && readStorage && writeStorage) {
                        init();
                       // Permission GRANTED (Here write your code what you want).
                    } else {
                        // Permission DENY (If user click on DENY then finish the activity);
                        finish();
                    }
                }
        }
    }

Great you are done with checkPermission & requestPermission.

NOTE:

This above code is working for Activity. There is a minor change in the fragment.

If I use this code in fragment then what should I change:

You want to just change in requestPermission() Method:

private void requestPermission() {
            requestPermissions(new String[]{INTERNET, CAMERA, READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE}, 1);
        }