Android桌面小组件的命名空间

今天发现，如果命名空间设置不对，无法控制widget的控件：

public class ParentsAppWidgetProvider extends AppWidgetProvider {
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // For each widget that needs an update, get the text that we should display:
        //   - Create a RemoteViews object for it
        //   - Set the text in the RemoteViews object
        //   - Tell the AppWidgetManager to show that views object for the widget.
        final int N = appWidgetIds.length;
        for (int i=0; i<N; i++) {
            int appWidgetId = appWidgetIds[i];
            // Construct the RemoteViews object.  It takes the package name (in our case, it's our
            // package, but it needs this because on the other side it's the widget host inflating
            // the layout from our package).
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider);
            
            // change color.
            //views.setTextColor(R.id.appwidget_text, 0xFFEEEEEE);
            views.setTextViewText(R.id.appwidget_text, "changed");
            
            // Tell the widget manager
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }
}

这段代码是在启动时就将组件的text设为“changed”，但是死活无效。

发现是默认的命名空间设置有问题，默认的AndroidManifest.xml的命名空间是：com.winlin.parents，生成的类是com.winlin.parents.ParentsAppWidgetProvider，必须将前面的命名空间改为com.winlin才行。

即AndroidManifest.xml的配置应该是：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.winlin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="5"
        android:targetSdkVersion="5" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        
        <receiver android:name="com.winlin.parents.ParentsAppWidgetProvider">
            <meta-data android:name="android.appwidget.provider"
                    android:resource="@xml/appwidget_provider" />
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
        </receiver>
        
    </application>

</manifest>

如下图所示：