Android FrameLayout Tutorial

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1- Android FrameLayout

FrameLayout is a simple layout. It can contain one or more child View(s), and they can overlap each other. Therefore, the android:layout_gravity attribute is used to locate the child View(s).
In particular,  FrameLayout has 9 gravity areas illustrated in the picture below. Note that they are imaginary areas, so it doesn't mean that the  FrameLayout is physically divided into 9 parts.
When a View is added to the  FrameLayout, by default, it will lie in the gravity of the  "left|top". Take a look at the example below, I add 2 Button(s) to the  FrameLayout, by default, they lie in the gravity of the  "left|top" and you see that they are overlapping each other.
Use the android:layout_gravity attribute to adjust the  button position.
The value of  android:layout_gravity can be the combination of the following values:
Constant in Java Value Description
Gravity.LEFT left  
Gravity.CENTER_HORIZONTAL center_horizontal  
Gravity.RIGHT right  
Gravity.CLIP_HORIZONTAL clip_horizontal  
Gravity.FILL_HORIZONTAL fill_horizontal  
     
Gravity.TOP top  
Gravity.CENTER_VERTICAL center_vertical  
Gravity.BOTTOM bottom  
Gravity.CLIP_VERTICAL clip_vertical  
Gravity.FILL_VERTICAL fill_vertical  
     
Gravity.START start  
Gravity.END end  
Gravity.CENTER center  
Gravity.FILL fill  
Below is an illustration of using both a  VideoView and a MediaController into a FrameLayout, which saves the application space and provides the user with a better experience.

2- Example of FrameLayout

In this example, I'm going to put an  ImageView and two  TextView(s) in a  FrameLayout, then use the  android:layout_gravity attribute to set their positions.
Example preview:
Show in Portraint screen
Show in Landscape screen
Awesome, now on  Android Studio, create a project:
  • File > New > New Project > Empty Activity
    • Name: FrameLayoutExample
    • Package name: org.o7planning.framelayoutexample
    • Language: Java
Then find an image file:
halong.png
After that, copy the file to the folder  "drawable" of the project:
Next, design the application interface:
Later, set some constraints for the  FrameLayout:
Now set some important attributes for the  ImageView to make sure that it fully fills the  FrameLayout.
* imageView *
<ImageView
    android:id="@+id/imageView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:adjustViewBounds="true"
    android:scaleType="fitXY"
    app:srcCompat="@drawable/halong" />
And set the  android:layout_gravity attribute for the  TextView(s):
Finally set  text, and textColor for the  TextView(s):
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:scaleType="fitXY"
            app:srcCompat="@drawable/halong" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top|left"
            android:text="Halong Bay, Vietnam"
            android:textColor="#FFFFFF" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            android:text="Photo by intrepidtravel.com"
            android:textColor="#FFFFFF" />

    </FrameLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.framelayoutexample;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Gravity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

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