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How to check if an Android application is running in the background?
This example demonstrates how do I check if an android application is running in the background.
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:padding="4dp" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="24sp" android:textStyle="bold" android:layout_centerInParent="true" android:text="Checking if Android Appication is running in Background"/> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import android.app.ActivityManager;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Boolean appRunningBackground;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityManager.RunningAppProcessInfo runningAppProcessInfo = new ActivityManager.RunningAppProcessInfo();
ActivityManager.getMyMemoryState(runningAppProcessInfo);
appRunningBackground = runningAppProcessInfo.importance != ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND;
if (appRunningBackground) {
Toast.makeText(getApplicationContext(), "Your Android Application is Running in " + "Background", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Your Android Application is not Running in " + "Background", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPause() {
super.onPause();
Toast.makeText(getApplicationContext(), "Your Android Application is Running in Background", Toast.LENGTH_SHORT).show();
}
}
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 the 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.
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