AppWidget之应用入门[实时更新系统当前时间]

AppWidget之应用入门[实时更新系统当前时间]

ShowTimeNowAppWidget

package  com.zhy.shortcut;

import  java.text.SimpleDateFormat;
import  java.util.Date;

import  android.appwidget.AppWidgetManager;
import  android.appwidget.AppWidgetProvider;
import  android.content.Context;
import  android.content.Intent;
import  android.os.Handler;
import  android.os.Message;
import  android.util.Log;
import  android.widget.RemoteViews;

public   class  ShowTimeNowAppWidget  extends  AppWidgetProvider {

     private   static   final  String TAG  =   " ShowTimeNowAppWidget " ;

    
    Handler handler;
    
    AppWidgetManager widgetManager;
    RemoteViews remoteViews;
    
    Context context;
    
    
    
    
    @Override
     public   void  onDeleted(Context context,  int [] appWidgetIds) {
         super .onDeleted(context, appWidgetIds);

        Log.d(TAG,  " ---------onDeleted---------- " );

    }

    @Override
     public   void  onDisabled(Context context) {
         super .onDisabled(context);
        Log.d(TAG,  " ---------onDisabled---------- " );
    }

    @Override
     public   void  onEnabled(Context context) {
         super .onEnabled(context);
        Log.d(TAG,  " ---------onEnabled---------- " );
    }

    @Override
     public   void  onReceive(Context context, Intent intent) {
         super .onReceive(context, intent);
        Log.d(TAG,  " ---------onReceive---------- " );
    }

    @Override
     public   void  onUpdate(Context context, AppWidgetManager appWidgetManager,
             int [] appWidgetIds) {
        
         super .onUpdate(context, appWidgetManager, appWidgetIds);

         this .context = context;
        
         final   int  appWidgetId = appWidgetIds[ 0 ];
        
         // 创建一个RemoteViews
        RemoteViews views = new  RemoteViews(context.getPackageName(),R.layout.widgetlayout);
        
        widgetManager = appWidgetManager;
        remoteViews = views;
        
        handler = new  Handler(){
            @Override
             public   void  handleMessage(Message msg) {
                 super .handleMessage(msg);
                
                 switch  (msg.what) {
                 case   0 :

                     // ComponentName component=new ComponentName(ShowTimeNowAppWidget.this.context, ShowTimeNowAppWidget.class);
                    
                     // 更新widget上TextView控件的内容
                    remoteViews.setTextViewText(R.id.widget_time, String.valueOf(msg.obj));
                     // 更新widget
                    widgetManager.updateAppWidget(appWidgetId, remoteViews);
                    
                     break ;
                 default :
                     break ;
                }
            }
        };
        
        handler.post( new  Runnable() {
            
            @Override
             public   void  run() {
                Message message = new  Message();
                message.what = 0 ;
                message.obj = new  SimpleDateFormat( " yyyy年MM月dd日 HH:mm:ss " ).format( new  Date());
                handler.sendMessage(message);
                
                handler.postDelayed( this ,  1000 );
            }
        });
        Log.d(TAG,  " ---------onUpdate---------- " );
        
    }

}

widgetlayout布局文件

<? xml version="1.0" encoding="utf-8" ?>
< RelativeLayout  xmlns:android ="http://schemas.android.com/apk/res/android"
    android:padding ="30dip"
    android:layout_width ="match_parent"
    android:layout_height ="wrap_content"   >

     < ImageView
         android:id ="@+id/widget_img"
        android:layout_width ="wrap_content"
        android:layout_height ="wrap_content"
        android:src ="@drawable/ic_dialog_time"   />

     < TextView
         android:textSize ="16dip"
        android:textColor ="@color/green"
        android:singleLine ="true"
        android:ellipsize ="none"
        android:gravity ="center"
        android:paddingLeft ="5dip"
        android:layout_toRightOf ="@id/widget_img"
        android:layout_alignTop ="@id/widget_img"
        android:layout_alignBottom ="@id/widget_img"
        android:id ="@+id/widget_time"
        android:layout_width ="match_parent"
        android:layout_height ="wrap_content"
        android:layout_weight ="1"   />

</ RelativeLayout >

appwidget-provider描述文件

<? xml version="1.0" encoding="utf-8" ?>
< appwidget-provider  xmlns:android ="http://schemas.android.com/apk/res/android"
    android:minWidth ="300dip"
    android:minHeight ="20dip"
    android:updatePeriodMillis ="1000"
    android:initialLayout ="@layout/widgetlayout"
     >
</ appwidget-provider >

AndroidManifest.xml中的配置

< receiver 
             android:name =".ShowTimeNowAppWidget"
             >
             < intent-filter >
                 < action  android:name ="android.appwidget.action.APPWIDGET_UPDATE" />
                 < category  android:name ="android.intent.category.DEFAULT" />
             </ intent-filter >
             < meta-data  android:name ="android.appwidget.provider"
               android:resource ="@xml/widget"   />
         </ receiver >

运行效果