Hi, Android 7 i.e nougat supports multi window mode to open more than one screens at a time

With help of this flag one activity can be open adjacent to another activity.

Require jdk : 1.8 or higher

Require sdk : 24 nougat

Require dependency :

compile 'com.android.support:appcompat-v7:24.0.0-beta1'

Example :

First of all check in your activity that is device support multi window or not -

if (!isInMultiWindowMode()) {
    someView.setText("Please enable multi window mode.");
} else {
    someView.setText("Enabled...");
}

declare activity dimensions in manifest :

<activity
    android:name="com.android.MyAdjacentActivity"
    android:taskAffinity="" />

and in your main activity we have to use these flags :

Intent intent = new Intent(this, MyAdjacentActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

Now Launch bounds activity that means we can declare some area bounds into its intent and activity will be run in specified area bound.

declaration in manifest :

<activity
    android:name="com.android.MyLaunchBoundsActivity"
    android:taskAffinity="" />

and start activity by passing launch bound as a bundle in intent :

Rect mBounds = new Rect(600, 400, 200, 0);

ActivityOptions mOptions = ActivityOptions.makeBasic();
mOptions.setLaunchBounds(mBounds);

Intent intent = new Intent(this, MyLaunchBoundsActivity.class);
startActivity(intent, options.toBundle());