How do you animate the change of background color of a view on Android?


This example demonstrates how do I animate the change of background color of a View on android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/relativeLayout"
   android:padding="8dp"
   tools:context=".MainActivity">
   <Button
      android:id="@+id/button"
      android:text="Animate background color"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_above="@id/textView"
      android:layout_centerInParent="true"
      android:layout_marginBottom="15dp"/>
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textSize="36sp"
      android:textStyle="bold"
      android:text="Changing Background color of this view."
      android:layout_centerInParent="true" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   TextView textView;
   Button button;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      button = findViewById(R.id.button);
      textView = findViewById(R.id.textView);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            ColorDrawable[] colorDrawables = {new ColorDrawable(Color.RED),
            new ColorDrawable(Color.BLUE), new ColorDrawable(Color.GREEN)};
            TransitionDrawable transitionDrawable = new TransitionDrawable(colorDrawables);
            textView.setBackground(transitionDrawable);
            transitionDrawable.startTransition(2000);
         }
      });
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −


Click here to download the project code.

raja
Published on 11-Sep-2019 15:43:32
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