android实现widget时钟示例分享
本文导语: 一、在 AndroidManifest.xml文件中配置Widgets: 代码如下: 二、在项目的res目录下建立xml目录,并且创建 t...
一、在 AndroidManifest.xml文件中配置Widgets:
二、在项目的res目录下建立xml目录,并且创建 timewidget_info.xml 文件,内容如下:
三、在layout文件夹下建立文件time_appwidget.xml:
四、在drawable文件夹下建立rectangle.xml文件(这部可以省略,主要是为了美化TextView控件,渐变效果):
五、后台代码实现:
package com.example.widget;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
public class TimeWidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
//当一个Widgets时会被调用
public void onDeleted(Context context, int[] appWidgetIds) {
// TODO Auto-generated method stub
super.onDeleted(context, appWidgetIds);
}
//第一次往桌面添加Widgets时会被调用,之后添加同类型Widgets不会被调用
public void onEnabled(Context context) {
context.startService(new Intent(context, TimerService.class));
}
//从桌面上删除最后一个Widgets时会被调用
public void onDisabled(Context context) {
context.stopService(new Intent(context, TimerService.class));
}
}
package com.example.widget;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Intent;
import android.os.IBinder;
import android.widget.RemoteViews;
public class TimerService extends Service {
private Timer timer;
@Override
public void onCreate() {
super.onCreate();
timer = new Timer();
timer.schedule(new MyTimerTask(), 0, 1000);
}
private final class MyTimerTask extends TimerTask{
@SuppressLint("SimpleDateFormat")
@Override
public void run() {
SimpleDateFormat sdf= new SimpleDateFormat("hh:mm:ss");
String time = sdf.format(new Date());
//获取Widgets管理器
AppWidgetManager widgetManager =AppWidgetManager.getInstance(getApplicationContext());
//widgetManager所操作的Widget对应的远程视图即当前Widget的layout文件
RemoteViews remoteView = new RemoteViews(getPackageName(), R.layout.time_appwidget);
remoteView.setTextViewText(R.id.textView, time);
//当点击Widgets时触发的世界
//remoteView.setOnClickPendingIntent(viewId, pendingIntent)
ComponentName componentName = new ComponentName(getApplicationContext(),TimeWidgetProvider.class);
widgetManager.updateAppWidget(componentName, remoteView);
}
}
@Override
public void onDestroy() {
timer.cancel();
timer=null;
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}