How To Update The Ui From A Background Service?

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How to Create Background Service in Android?

Earlier getting into instance, we should know what service is in android. Service is going to do back footing operation without collaborate with UI and information technology works even after activity destroy.

This example demonstrate about how to Create Background Service in Android.

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

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

<?xml version = "1.0" encoding = "utf-8"?> <android.support.constraint.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">    <TextView       android:id = "@+id/text"       android:layout_width = "wrap_content"       android:layout_height = "wrap_content"       android:text = "Outset Service"       android:textSize = "25sp"       app:layout_constraintBottom_toBottomOf = "parent"       app:layout_constraintLeft_toLeftOf = "parent"       app:layout_constraintRight_toRightOf = "parent"       app:layout_constraintTop_toTopOf = "parent" /> </android.support.constraint.ConstraintLayout>

In the above lawmaking, we have taken text view, when user click on text view, information technology volition showtime service and stop service.

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

packet com.case.andy.myapplication; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.TextView; public course MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       final TextView text = findViewById(R.id.text);       text.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View v) {             if (text.getText().toString().equals("Started")) {                text.setText("Stoped");                stopService(new Intent(MainActivity.this,service.grade));             } else {                text.setText("Started");                startService(new Intent(MainActivity.this,service.course));             }          }       });    } }

In the above code to start and stop service. Nosotros have used intent and passed context and service form. Now create a service class in package binder equally service.class and add the post-obit code –

parcel com.example.andy.myapplication; import android.app.Service; import android.content.Intent; import android.bone.IBinder; import android.widget.Toast; public class service extends Service {    @Override    public IBinder onBind(Intent intent) {       return aught;    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {       Toast.makeText(this, "Service started by user.", Toast.LENGTH_LONG).show();       render START_STICKY;    }    @Override    public void onDestroy() {       super.onDestroy();       Toast.makeText(this, "Service destroyed by user.", Toast.LENGTH_LONG).testify();    } }

Footstep four − Add the post-obit code to manifest.xml

<?xml version = "1.0" encoding = "utf-eight"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android"    package = "com.case.andy.myapplication">    <application       android:allowBackup = "truthful"       android:icon = "@mipmap/ic_launcher"       android:label = "@string/app_name"       android:roundIcon = "@mipmap/ic_launcher_round"       android:supportsRtl = "truthful"       android:theme = "@style/AppTheme">       <action android:name = ".MainActivity">          <intent-filter>             <action android:name = "android.intent.action.Principal" />             <category android:name = "android.intent.category.LAUNCHER" />           </intent-filter>        </activity>        <service android:proper noun = ".service"/>    </application> </manifest>

Permit'southward try to run your application. I assume you have continued your bodily Android Mobile device with your computer. To run the app from android studio, open up one of your project'southward action files and click Run icon from the toolbar. Select your mobile device every bit an option and then cheque your mobile device which volition display your default screen –