This post describes how to bind to a Service and unbind a Service on Button click.
Create your layout in activity_main.xml. Add a TextView for displaying date, a Button for binding to service, and another button for unbinding from Service, and a Button to update time.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello World!"
android:padding="10dp"
android:layout_margin="10dp"
android:textSize="25dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Service not bound"
android:padding="10dp"
android:layout_margin="10dp"
android:textSize="25dp" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="BIND SERVICE"
android:layout_margin="10dp"
android:id="@+id/button1"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="UNBIND SERVICE"
android:layout_margin="10dp"
android:id="@+id/button2"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show Time"
android:layout_margin="10dp"
android:id="@+id/button3"/>
</LinearLayout>Create a java file, TestService.java and add following code.
package com.example.dialog;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import androidx.annotation.Nullable;
import java.util.Date;
public class TestService extends Service {
MyBinder binder1 = new MyBinder();
public class MyBinder extends Binder{
TestService getService(){
return TestService.this;
}
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return binder1;
}
public void updateTime(){
MainActivity.textView1.setText("Current Time: " + new Date());
}
}
In AndroidManifest.xml add the Service class.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dialog">
<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/Theme.Dialog">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".TestService"/>
</application>
</manifest>In MainActivity.java bind Service on button click.
package com.example.dialog;
import android.content.ComponentName;
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;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
static TextView textView1;
static TextView textView2;
boolean bound;
TestService service1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1 = findViewById(R.id.textView1);
textView2 = findViewById(R.id.textView2);
Button button1 = findViewById(R.id.button1);
Button button2 = findViewById(R.id.button2);
Button button3 = findViewById(R.id.button3);
textView1.setText("Current Time: " + new Date());
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, TestService.class);
bindService(intent, connection, BIND_AUTO_CREATE);
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (bound){
unbindService(connection);
bound=false;
textView2.setText("Service not bound");
}
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (bound) {
service1.updateTime();
}
}
});
}
ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
TestService.MyBinder binder = (TestService.MyBinder) service;
service1 = binder.getService();
bound = true;
textView2.setText("Service bound");
}
@Override
public void onServiceDisconnected(ComponentName name) {
bound = false;
textView2.setText("Service not bound");
}
};
}Now run the app.