How to Set Background Drawable Programmatically in Android?
In many android applications, we can get to see that the background color of this application changes dynamically when updated from the server. For updating this color we have to set the background color of our layout programmatically. In this article, we will take a look at How to Set Background Drawable Programmatically in an Android application.
Note: This Android article covered in both Java and Kotlin languages.
Step by Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio.
Step 2: Working with the activity_main.xml file
Navigate to app > res > layout > activity_main.xml and add the below code to it. Comments are added in the code to get to know in detail.
XML
<? xml version = "1.0" encoding = "utf-8" ?>
< RelativeLayout
android:id = "@+id/idRLContainer"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
android:orientation = "vertical"
tools:context = ".MainActivity" >
< TextView
android:id = "@+id/idTVHeading"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:layout_margin = "20dp"
android:gravity = "center"
android:padding = "10dp"
android:text = "Background Drawable in Android"
android:textAlignment = "center"
android:textColor = "@color/white"
android:textSize = "20sp"
android:textStyle = "bold" />
</ RelativeLayout >
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Step 3: Creating a custom drawable
Navigate to app>res>drawable>Right click on it>New Drawable file and name it as back_drawable and add the below code to it. Comments are added in the code to get to know in detail.
XML
<? xml version = "1.0" encoding = "utf-8" ?>
android:shape = "rectangle" >
< gradient
android:angle = "270"
android:endColor = "@color/white"
android:startColor = "#0F9D58" />
</ shape >
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Step 4: Working with the MainActivity file
Navigate to app > java > your app’s package name > MainActivity file and add the code below. Comments are added in the code to get to know in detail.
Kotlin
package com.gtappdevelopers.kotlingfgproject
import android.os.Bundle
import android.widget.RelativeLayout
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
lateinit var containerRL: RelativeLayout
override fun onCreate(savedInstanceState: Bundle?) {
super .onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
containerRL = findViewById(R.id.idRLContainer)
containerRL.background = resources.getDrawable(R.drawable.back_drawable)
}
}
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Java
package com.gtappdevelopers.kotlingfgproject;
import android.os.Bundle;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private RelativeLayout containerRL;
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
containerRL = findViewById(R.id.idRLContainer);
containerRL.setBackground(getResources().getDrawable(R.drawable.back_drawable));
}
}
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Now run your application to see the output of it.
Output:
Last Updated :
23 Dec, 2022
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