How to bind to a Service in Android

In this android programming source code example, we are going to bind to a Service in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to bind to a Service in Android.

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=".MapAndService.MapAndServiceActivity20">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">

        <TextView
            android:id="@+id/timestamp_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="120dp"
            android:gravity="center"
            android:text="TimeStamp"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <Button
            android:id="@+id/btnStart"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Start Service"
            android:layout_marginTop="5dp"
            android:background="@color/colorAccent"
            android:textColor="#ffffff"/>

        <Button
            android:id="@+id/btnStop"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="Stop Service"
            android:layout_marginTop="5dp"
            android:background="@color/colorAccent"
            android:textColor="#ffffff"/>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MapAndServiceActivity20 extends AppCompatActivity {
    private Button btnStart;
    private Button btnStop;
    private TextView timestampText;
    Service20 mBoundService;
    boolean mServiceBound = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map_and_service20);
        timestampText = (TextView) findViewById(R.id.timestamp_text);
        btnStart = (Button) findViewById(R.id.btnStart);
        btnStop = (Button) findViewById(R.id.btnStop);

        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mServiceBound) {
                    timestampText.setText(mBoundService.getTimestamp());
                }
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mServiceBound) {
                    unbindService(mServiceConnection);
                    mServiceBound = false;
                }
                Intent intent = new Intent(MapAndServiceActivity20.this, Service20.class);
                stopService(intent);
            }
        });
    }


    @Override
    protected void onStart() {
        super.onStart();
        Intent intent = new Intent(this, Service20.class);
        startService(intent);
        bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mServiceBound) {
            unbindService(mServiceConnection);
            mServiceBound = false;
        }
    }

    private ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            mServiceBound = false;
        }
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Service20.MyBinder myBinder = (Service20.MyBinder) service;
            mBoundService = myBinder.getService();
            mServiceBound = true;
        }
    };
}

Service20.java

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;
import android.widget.Chronometer;

public class Service20 extends Service {
    private static String LOG_TAG = "BoundService";
    private IBinder mBinder = new MyBinder();
    private Chronometer mChronometer;

    @Override
    public void onCreate() {
        super.onCreate();
        Log.v(LOG_TAG, "in onCreate");
        mChronometer = new Chronometer(this);
        mChronometer.setBase(SystemClock.elapsedRealtime());
        mChronometer.start();
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.v(LOG_TAG, "in onBind");
        return mBinder;
    }

    @Override
    public void onRebind(Intent intent) {
        Log.v(LOG_TAG, "in onRebind");
        super.onRebind(intent);
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.v(LOG_TAG, "in onUnbind");
        return true;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.v(LOG_TAG, "in onDestroy");
        mChronometer.stop();
    }

    public String getTimestamp() {
        long elapsedMillis = SystemClock.elapsedRealtime()
                - mChronometer.getBase();
        int hours = (int) (elapsedMillis / 3600000);
        int minutes = (int) (elapsedMillis - hours * 3600000) / 60000;
        int seconds = (int) (elapsedMillis - hours * 3600000 - minutes * 60000) / 1000;
        int millis = (int) (elapsedMillis - hours * 3600000 - minutes * 60000 - seconds * 1000);
        return hours + ":" + minutes + ":" + seconds + ":" + millis;
    }

    public class MyBinder extends Binder {
        Service20 getService() {
            return Service20.this;
        }
    }
}

AndroidManifest.xml

<service android:name=".MapAndService.Service20" />

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