Android平台下简单Widget的搭建过程

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Android平台下Widget的搭建过程为：

转自：http://www.cnblogs.com/alwaysyouare/archive/2010/01/06/1640219.html

1.在res/layout下创建Widget的布局文件：digitalclock.xml

<?xml version="1.0" encoding="UTF-8"?><TextView      xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:id="@+id/time"    android:textSize="45px"    android:scrollX="30px"    android:scrollY="30px"    android:textStyle="bold"    android:textColor="#ff000000"    android:background="@drawable/bg"    />

2.在res/xml下创建Widget的描述文件：est_appwidget.xml

<?xml version="1.0" encoding="UTF-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"    android:minWidth="186dip"    android:minHeight="212dip"    android:updatePeriodMillis="1000"    android:configure="com.activity.TestActivity" // 第一次启动时，配置界面    android:initialLayout="@layout/digitalclock"/>

3. 从AppWidgetProvider继承一个类(ESTTime)，重写其虚方法

package com.android.test.esttime;import android.app.Service;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.os.IBinder;import android.text.format.Time;import android.widget.RemoteViews;public class ESTTime extends AppWidgetProvider {        /** Called when the activity is first created. */    @Override    public void onUpdate(Context context,            AppWidgetManager appWidgetManager,int[] appWidgetIds )    {        context.startService(new Intent(context,UpdateService.class));            }      //Service类    public static class UpdateService extends Service {        @Override        public void onStart(Intent intent,int startId){            Time estTime = new Time("EST");            estTime.setToNow();            RemoteViews updateViews =                 new RemoteViews(getPackageName(),                        R.layout.digitalclock);            updateViews.setTextViewText(R.id.time, estTime.format("%H:%M"));                        ComponentName thisWidget = new ComponentName(this,ESTTime.class);                        AppWidgetManager manager = AppWidgetManager.getInstance(this);            manager.updateAppWidget(thisWidget, updateViews);        }        @Override        public IBinder onBind(Intent intent) {            // TODO Auto-generated method stub            return null;        }    }    }

4.在AndroidManifest.xml中注册本Widget

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.android.test.esttime"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <receiver android:name=".ESTTime"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />            </intent-filter>            <meta-data android:name="android.appwidget.provider"             android:resource="@xml/est_appwidget"/>                    </receiver>        <service android:name=".ESTTime$UpdateService"/>    </application>    <uses-sdk android:minSdkVersion="3" /></manifest>

5.TestActivity.xml

int mAppWidgetId;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.oawidget);mBtn = (Button)findViewById(R.id.testbtn);mBtn.setOnClickListener(l);Intent intent = getIntent();Bundle extras = intent.getExtras();if (extras != null) {    mAppWidgetId = extras.getInt(            AppWidgetManager.EXTRA_APPWIDGET_ID,             AppWidgetManager.INVALID_APPWIDGET_ID);}}View.OnClickListener l = new OnClickListener() {@Overridepublic void onClick(View v) {Intent resultValue = new Intent();resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);setResult(RESULT_OK, resultValue);finish();}};

最后，编译运行。这样在Home上长按弹出的Widget列表中就有新创建的Weiget了。

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