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新建个项目,修改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="com.example.xinwei.servicetest.MainActivity">
<Button
android:id="@+id/start_service"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="start service"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.498" />
<Button
android:id="@+id/stop_service"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="stop service"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.929"
app:layout_constraintStart_toEndOf="@+id/start_service"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.498" />
</android.support.constraint.ConstraintLayout>
新建个MyService.java的服务,系统会自动在AndroidManifest.xml里添加注册。然后修改此文件package com.example.xinwei.servicetest;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class MyService extends Service {
private static final String TAG = "MyService";
public MyService() {
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate: ");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "onStartCommand: ");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy: ");
}
}
修改mainactivity.javapackage com.example.xinwei.servicetest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button startService = (Button)findViewById(R.id.start_service);
Button stopService = (Button)findViewById(R.id.stop_service);
startService.setOnClickListener(this);
stopService.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.start_service:
Intent startIntent = new Intent(this,MyService.class);
startService(startIntent);
break;
case R.id.stop_service:
Intent stopIntent = new Intent(this,MyService.class);
stopService(stopIntent);
break;
default:
break;
}
}
}
当按两个按钮时logcat会出现我们写的log,如图:
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