How to Android Runtime Permission Example

In Android OS (Marshmallow on wards) , google introduced run time permissions to access Storage, Camera, Location etc..

Let see an example how to ask single permission in android
Here is the Link for Dangerous permissions and permission groups.

Step 1 :AndroidManifest.xml
let us add storage and location permission in manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.pratap.runtimepermissions">

    <!--  Permission for writing and reading SD Card -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <!--  Permission for accessing user's current location -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Step 2:MainActivity.java this activity we check for single permission.

public class MainActivity extends AppCompatActivity {

    final int REQUEST_PERMISSIONS = 1;
    final int DELAY_TIME = 1000;

    TextView txt_permission;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txt_permission = findViewById(R.id.txt_permission);
        checkSinglePermissions();
    }

    private void checkSinglePermissions() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            mHandler.sendEmptyMessageDelayed(1, DELAY_TIME);
        } else {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSIONS);
        }
    }



    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_PERMISSIONS) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // permission was granted
                mHandler.sendEmptyMessageDelayed(1, DELAY_TIME);

            } else {
                // permission denied, boo!
            }
        }
    }


    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 1) {
                txt_permission.setText("SD Card Permission granted");

                // code goes here after getting permission
               
            }
        }
    };

}

Step 2 : MultiplePermissionActivity.java
If you require more than one permission at a time here is the code

public class MutliplePermissionActivity extends AppCompatActivity {

    final int REQUEST_PERMISSIONS = 1;
    final int DELAY_TIME = 4000;

    TextView txt_permission;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txt_permission = findViewById(R.id.txt_permission);
        checkMultiplePermissions();
    }

    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 1) {
                txt_permission.setText("SD Card & Location Permission granted");
            }
        }
    };

    // reqeust Multiple permissions code
    private void checkMultiplePermissions() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
                && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mHandler.sendEmptyMessageDelayed(1, DELAY_TIME);
        } else {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_PHONE_STATE}, REQUEST_PERMISSIONS);
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_PERMISSIONS) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                // permission was granted
                mHandler.sendEmptyMessageDelayed(1, DELAY_TIME);

            } else {
                // permission denied, boo!
            }
        }
    }
}