继承Service输出当前时间

怼烎@ 2022-08-19 13:24 164阅读 0赞

1、布局文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
    
        <Button
            android:id="@+id/current_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="当前时间"
            android:textColor="@android:color/black"
            android:textSize="25dp" />
    
    </LinearLayout>

2、创建CurrentTimeService类，继承Service类，并重写onBind()和onStartCommand()方法

public class CurrentTimeService extends Service {
    
    	@Override
    	public IBinder onBind(Intent intent) {
    		return null;
    	}
    	
    	@Override
    	public int onStartCommand(Intent intent, int flags, int startId) {
    		Time time = new Time();//创建Time对象
    		time.setToNow();//设置时间为当前时间
    		String currentTime = time.format("%Y-%m-%d %H:%M:%S");//设置时间格式
    		Log.i("CurrentTimeService",currentTime);//记录当前时间
    		return START_STICKY;
    	}
    
    }

3、MainActivity

public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Button currentTime = (Button)findViewById(R.id.current_time);//通过ID获得按钮对象
            currentTime.setOnClickListener(new OnClickListener() {
    			@Override
    			public void onClick(View v) {
    				startService(new Intent(MainActivity.this, CurrentTimeService.class));//启动服务
    			}
    		});
        }
    }

4、AndroidManifest.xml

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