app->build compile 'com.android.support:percent:xx'
layout
<?xml version="1.0" encoding="utf-8"?> <android.support.percent.PercentFrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/Button9" android:text="Buttoon9" android:layout_gravity="left|top" app:layout_widthPercent="50%" app:layout_heightPercent="50%"/> <Button android:text="Button10" android:layout_gravity="right|top" app:layout_widthPercent="50%" app:layout_heightPercent="50%"/> <Button android:text="Button11" android:layout_gravity="right|bottom" app:layout_widthPercent="50%" app:layout_heightPercent="50%"/> <Button android:text="Button12" android:layout_gravity="left|bottom" app:layout_widthPercent="50%" app:layout_heightPercent="50%"/> </android.support.percent.PercentFrameLayout>