Runtime Permissions Request in Android

Screen Shots:

Note : Please add android-support-v4.jar file in Project libs folder.

1. MainActivity

public class MainActivity extends Activity implements

                   OnRequestPermissionsResultCallback {

          private static int REQUEST_CODE = 1;

          private TextView tv;

          private RelativeLayout layout;

          @Override

          protected void onCreate(Bundle savedInstanceState) {

                   super.onCreate(savedInstanceState);

                   setContentView(R.layout.activity_main);

                   // getting references

                   layout = (RelativeLayout) findViewById(R.id.layout);

                   tv = (TextView) findViewById(R.id.tv);

                   // checking weather the permission is already granted

                   if (ContextCompat.checkSelfPermission(this,

                   Manifest.permission.READ_CONTACTS) ==                    

                             PackageManager.PERMISSION_GRANTED) {

                             // permission is already granted

                             Toast.makeText(getApplicationContext(),

                             "Permission  already granted",                              

                                      Toast.LENGTH_LONG).show();

                             // setting background color and text

                             layout.setBackgroundColor(Color.BLUE);

                             tv.setText("Permission  already granted");

                   } else {

                             // permission is not granted yet

                             // Asking for permission

                             ActivityCompat.requestPermissions(this,

                                                new String[] {

                             Manifest.permission.READ_CONTACTS },

                                                REQUEST_CODE);

                   }

          }

          @Override

          public void onRequestPermissionsResult(int requestCode,

                             @NonNull String[] permissions, @NonNull int[]                        

                             grantResults) {

                   if (requestCode == 1) {

                             // checking if the permission is granted

                             if (grantResults.length > 0

                             && grantResults[0] ==                                                  

                             PackageManager.PERMISSION_GRANTED)

                             {

                                      // permission is granted,do your operation

                                      Toast.makeText(getApplicationContext(),                                                              "Permission granted",

                                                Toast.LENGTH_SHORT).show();

                                      // setting background color and text

                                      layout.setBackgroundColor(Color.BLUE);

                                      tv.setText("Permission granted");

                             } else {

                                      // permission not granted

                                      // Display your message to customer

                                      Toast.makeText(this, "You denied the permission",

                                                          Toast.LENGTH_LONG).show();

                                      // setting background color and text

                                      layout.setBackgroundColor(Color.RED);

                                      tv.setText("You denied the permission");

                             }

                   }

          }

}

2. activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/layout"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/tv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:gravity="center"

        android:text="@string/hello_world"

        android:textColor="#ffffff"

        android:textSize="20dp"

        android:textStyle="bold" />

</RelativeLayout>

3. AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.venkat.runtimepermissionsrequestdemo"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="23" />

    <uses-permission android:name="android.permission.READ_CONTACTS"          />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Note : Please add android-support-v4.jar file in Project libs folder.

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