AppWidget之应用入门[实时更新系统当前时间]

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ShowTimeNowAppWidget

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>