Android FrameLayout Tutorial
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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.TOP | top | |
| Gravity.CENTER_VERTICAL | center_vertical | |
| Gravity.BOTTOM | bottom | |
| Gravity.START | start | |
| Gravity.END | end | |
| Gravity.CENTER | center | |
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.
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);
}
}
*
