RemoteViews嵌入ListView复杂布局

from http://blog.csdn.net/liliang497/article/details/8308313

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;
        }
    }
}