Android平台下简单Widget的搭建过程
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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