RemoteViews嵌入ListView复杂布局

主要函数

public void setRemoteAdapter (int appWidgetId, int viewId, Intent intent)

当在widgets中使用集合（比如说ListView, StackView等等），在单独的一个条目中设置PendingIntents是非常浪费的，并且是不被允许的。然而一个单独的PendingIntents模板可以设置在集合里，参见setPendingIntentTemplate(int, PendingIntent)，并且一个给定条目的单独的on-click的动作可以通过在条目上设置fillInIntent来区别。然后这个fillInIntent就和PendingIntent的实例结合在一起决定最终的被点击执行的intent。规定如下：在PendingIntent实例里，左边为空白的任何区域，但由fillInIntent提供的，将被重写，同时PendingIntent的结果将被使用。然后PendingIntent将被在fillInIntent中设置的有联系的字段填充。

public void setOnClickFillInIntent (int viewId, Intent fillInIntent)

当在widgets中使用集合(比如说ListView, StackView等等)时，在单独的一个条目中设置PendingIntent代价是很昂贵的，因此也是不被允许的。这个方法应该在集合中设置一个单独的PendingIntent模板,然后每一个单独的条目都可以通过setOnClickFillInIntent(int, Intent)来区别他们的点击事件。

public void setPendingIntentTemplate (int viewId, PendingIntent pendingIntentTemplate)

1.布局文件

在Mantifest中：

        

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.appwidget"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        
        <receiver android:name=".CustomWidget">
            <intent-filter >
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"></action>
            </intent-filter>
            <meta-data 
                android:name="android.appwidget.provider"
                android:resource="@xml/custom_widget">
            </meta-data>
        </receiver>
        
           <service 
            android:name=".UpdateService"
            android:permission="android.permission.BIND_REMOTEVIEWS"
            android:exported="false" >
        </service>
    </application>

</manifest>

在res/xml/下建立custom_widget.xml文件

    

<?xml version="1.0" encoding="UTF-8"?>
<appwidget-provider 
	xmlns:android = "http://schemas.android.com/apk/res/android"
	android:minWidth="280dp"
	android:minHeight="280dp"
	android:initialLayout="@layout/widget_layout"
	android:updatePeriodMillis="0"> 
	<!-- sdk1.5之后updatePeriodMillis已失效，置为0，循环执行自行在代码中实现 -->
</appwidget-provider>

在res/layout/下建立widget_layout和widget_list_item布局文件

   widget_layout.xml

<?xml version="1.0" encoding="UTF-8"?>
<FrameLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000">
    
    <ListView 
        android:id="@+id/widget_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="none"
        android:divider="@drawable/widget_list_divider"
        android:listSelector="@drawable/list_bg_selector" 
        android:layout_marginTop="4dp"
        android:layout_marginBottom="4dp"
        android:layout_marginLeft = "5dp"
        android:cacheColorHint="#00000000"/> 
    
</FrameLayout>

widget_list_item布局文件：

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout 
	xmlns:android = "http://schemas.android.com/apk/res/android"
    android:id = "@+id/widget_list_item_layout"
    android:layout_width = "fill_parent"
    android:layout_height = "fill_parent"
    android:background="#00000000"
    android:orientation="vertical"> 
  	<TextView 
    	android:id = "@+id/widget_list_item_tv"
        android:layout_width = "fill_parent"
        android:layout_height = "wrap_content"
        android:layout_marginTop = "10dip"
        android:layout_marginRight="10dip"
        android:layout_marginLeft = "20dp"
        android:lineSpacingExtra = "4dip"
    	android:textSize="20sp"
       	android:textColor="#FFFFF0"/>
</LinearLayout>

CustomWidget.java

package com.test.appwidget;

import java.util.ArrayList;
import java.util.List;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class CustomWidget extends AppWidgetProvider{

	private static List<String> sList;

	static{
		sList = new ArrayList<String>();
		sList.add("第一条新闻");
		sList.add("第二条新闻");
		sList.add("第三条新闻");
		sList.add("第四条新闻");
		sList.add("第五条新闻");
		sList.add("第六条新闻");
	}

	private ComponentName thisWidget;
	private RemoteViews remoteViews;

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

		thisWidget = new ComponentName(context, CustomWidget.class);
		remoteViews = new RemoteViews(context.getPackageName(),	R.layout.widget_layout);

		Intent intent = new Intent(context, UpdateService.class);
		intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[0]);
		//设置适配器
		remoteViews.setRemoteAdapter(R.id.widget_list, intent);

		Intent intent2 = new Intent();
		//TODO
		//intent2.setComponent(new ComponentName("包名", "类名"));
		PendingIntent pendingIntentTemplate = PendingIntent.getActivity(context, 1, intent2, PendingIntent.FLAG_UPDATE_CURRENT);
		
		//拼接PendingIntent
		remoteViews.setPendingIntentTemplate(R.id.widget_list, pendingIntentTemplate);

		//更新RemoteViews
		appWidgetManager.updateAppWidget(thisWidget, remoteViews);
		
		AppWidgetManager manager = AppWidgetManager.getInstance(context);
		manager.notifyAppWidgetViewDataChanged(appWidgetIds[0], R.id.widget_list);
	}

	@Override
	public void onDisabled(Context context) {
		super.onDisabled(context);
	}


	public static List<String> getList(){
		return sList;
	}

}

UpdateService.java

package com.test.appwidget;

import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.os.Looper;
import android.widget.RemoteViews;
import android.widget.RemoteViewsService;

public class UpdateService extends RemoteViewsService {

	@Override
	public void onStart(Intent intent, int startId){
		super.onCreate();
	}
	@Override
	public IBinder onBind(Intent intent) {
		return super.onBind(intent);
	}
	@Override
	public RemoteViewsFactory onGetViewFactory(Intent intent) {
		return new ListRemoteViewsFactory(this.getApplicationContext(), intent);
	}

	class ListRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory{

		private final Context mContext;
		private final List<String> mList;

		public ListRemoteViewsFactory(Context context, Intent intent){
			mContext = context;
			mList = CustomWidget.getList();

			if(Looper.myLooper() == null){
				Looper.prepare();
			}
		}

		@Override
		public void onCreate() {
		}

		@Override
		public void onDataSetChanged() {
		}

		@Override
		public void onDestroy() {
			mList.clear();
		}

		@Override
		public int getCount() {
			return mList.size();
		}

		@Override
		public RemoteViews getViewAt(int position) {
			if(position<0 || position>=mList.size())
				return null;
			String content = mList.get(position);
			final RemoteViews rv = new RemoteViews(mContext.getPackageName(), R.layout.widget_list_item);

			Intent intent = new Intent();
			//TODO
			//intent.setComponent(new ComponentName("包名", "类名"));
			//与CustomWidget中remoteViews.setPendingIntentTemplate配对使用
			rv.setOnClickFillInIntent(R.id.widget_list_item_layout, intent);

			rv.setTextViewText(R.id.widget_list_item_tv, content);

			return rv;
		}

		@Override
		public RemoteViews getLoadingView() {
			return null;
		}

		@Override
		public int getViewTypeCount() {
			return 1;
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public boolean hasStableIds() {
			return true;
		}
	}
}