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 Android教程網 >> Android技術 >> 關於Android編程 >> Android Widget 小部件(四---完結) 使用ListView、GridView、StackView、ViewFlipper展示Widget

Android Widget 小部件(四---完結) 使用ListView、GridView、StackView、ViewFlipper展示Widget

編輯：關於Android編程

官方有話這樣說：

A RemoteViews object (and, consequently, an App Widget) can support the following layout classes:

  • FrameLayout
  • LinearLayout
  • RelativeLayout

    And the following widget classes:

    • AnalogClock
    • Button
    • Chronometer
    • ImageButton
    • ImageView
    • ProgressBar
    • TextView
    • ViewFlipper
    • ListView
    • GridView
    • StackView
    • AdapterViewFlipper

      Descendants of these classes are not supported.不支持這些類的後代

      接下來的示例說明怎麼樣實現 使用ListView、GridView、StackView、ViewFlipper創建AppWidget

      menifest

      set_widget_provider.xml

      widget使用的布局文件 collections_view_widget.xml

      集合的數據源 需要 繼承 RemoteViewsService 

      package com.stone.service;

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

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RemoteViews;
import android.widget.RemoteViewsService;

import com.stone.R;
import com.stone.receiver.WidgetSetProvider;

/**
 * 繼承自RemoteViewsService 必須重寫onGetViewFactory
 * 該服務只是用來 創建 集合widget使用的數據源
 * @author stone
 */
public class WidgetSetService extends RemoteViewsService {
	
	public WidgetSetService() {
		
	}
	
	@Override
	public RemoteViewsFactory onGetViewFactory(Intent intent) {
		return new WidgetFactory(this.getApplicationContext(), intent);
	}
	
	
	public class WidgetFactory implements RemoteViewsService.RemoteViewsFactory {
		private static final int mCount = 10;
		private Context mContext;
		private List mWidgetItems = new ArrayList();
		
		
		public WidgetFactory(Context context, Intent intent) {
	        mContext = context;
//	        mAppWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
//	                AppWidgetManager.INVALID_APPWIDGET_ID);
	    }
		
		@Override
		public void onCreate() {
			for (int i = 0; i < mCount; i++) {
                mWidgetItems.add("item:" + i + "!");
            }
		}

		@Override
		public void onDataSetChanged() {
			/*
			 * appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetIds, R.id.listview);
			 * 使用該通知更新數據源，會調用onDataSetChanged
			 */
			System.out.println("----onDataSetChanged----");
		}

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

		@Override
		public int getCount() {
			return  mCount;
		}

		@Override
		public RemoteViews getViewAt(int position) {
			RemoteViews views = new RemoteViews(mContext.getPackageName(), android.R.layout.simple_list_item_1);
			views.setTextViewText(android.R.id.text1, "item:" + position);
			System.out.println("RemoteViewsService----getViewAt" + position);
			
			
			Bundle extras = new Bundle();
            extras.putInt(WidgetSetProvider.EXTRA_ITEM, position);
            Intent fillInIntent = new Intent();
            fillInIntent.putExtras(extras);
            /*
             * android.R.layout.simple_list_item_1 --- id --- text1
             * listview的item click：將fillInIntent發送，
             * fillInIntent它默認的就有action 是provider中使用 setPendingIntentTemplate 設置的action
             */
			views.setOnClickFillInIntent(android.R.id.text1, fillInIntent);
			
			return views;
		}

		@Override
		public RemoteViews getLoadingView() {
			/* 在更新界面的時候如果耗時就會顯示 正在加載... 的默認字樣，但是你可以更改這個界面
			 * 如果返回null 顯示默認界面
			 * 否則 加載自定義的，返回RemoteViews
			 */
			return null;
		}

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

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

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

}

      widgetprovider 

      package com.stone.receiver;

import com.stone.R;
import com.stone.service.WidgetSetService;

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.os.Bundle;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.view.View;
import android.widget.RemoteViews;
import android.widget.Toast;
import android.widget.ViewFlipper;

/**
 * 使用了集合展示AppWidget
 * ListView、GridView、StackView 設置adapter，處理item點擊
 * ViewFlipper 在RemoteViews中缺少支持，暫只能在它的布局文件中設置 輪換效果
 * 				對於切換到哪一個子view的item事件不好處理，只能設置一個整體setPendingIntent
 * @author stone
 */
public class WidgetSetProvider extends AppWidgetProvider {
	public final static String CLICK_ACTION = "com.stone.action.clickset";
	public final static String CLICK_ITEM_ACTION = "com.stone.action.clickset.item";
	public final static String EXTRA_ITEM = "extra_item";
	
	@Override
	public void onReceive(Context context, Intent intent) {
		super.onReceive(context, intent);
		System.out.println(intent.getAction());
		if (TextUtils.equals(CLICK_ACTION, intent.getAction())) {
			int extraType = intent.getIntExtra("view_tag", 0);
			if (extraType > 0) {
				System.out.println("extra:::" + extraType);
				
				switch (extraType) {
				case 1:
					updateWidget(context, R.id.listview, R.id.gridview, R.id.stackview, R.id.viewflipper);
					break;
				case 2:
					updateWidget(context, R.id.gridview, R.id.listview, R.id.stackview, R.id.viewflipper);
					break;
				case 3:
					updateWidget(context, R.id.stackview, R.id.gridview, R.id.listview, R.id.viewflipper);
					break;
				case 4:
					updateWidget(context, R.id.viewflipper, R.id.gridview, R.id.stackview, R.id.listview);
					break;
	
				default:
					break;
				}
			} 
		} else if (TextUtils.equals(CLICK_ITEM_ACTION, intent.getAction())) {
			Bundle extras = intent.getExtras();
			int position = extras.getInt(WidgetSetProvider.EXTRA_ITEM, -1);
			if (position != -1) {
				System.out.println("--點擊了item---" + position);
				System.out.println("");
//				Toast.makeText(context, "click item:" + position, 0).show();
			}
		}
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
		RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.collections_view_widget);
		
		Intent intent1 = new Intent(CLICK_ACTION);
		intent1.putExtra("view_tag", 1);
		PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, 101, intent1, 0);
		views.setOnClickPendingIntent(R.id.btn_listview, pendingIntent1);
		
		Intent intent2 = new Intent(CLICK_ACTION);
		intent2.putExtra("view_tag", 2);
		PendingIntent pendingIntent2 = PendingIntent.getBroadcast(context, 102, intent2, 0);
		views.setOnClickPendingIntent(R.id.btn_gridview, pendingIntent2);
		
		Intent intent3 = new Intent(CLICK_ACTION);
		intent3.putExtra("view_tag", 3);
		PendingIntent pendingIntent3 = PendingIntent.getBroadcast(context, 103, intent3, 0);
		views.setOnClickPendingIntent(R.id.btn_stackview, pendingIntent3);
		
		Intent intent4 = new Intent(CLICK_ACTION);
		intent4.putExtra("view_tag", 4);
		PendingIntent pendingIntent4 = PendingIntent.getBroadcast(context, 104, intent4, 0);
		views.setOnClickPendingIntent(R.id.btn_viewflipper, pendingIntent4);
		
		appWidgetManager.updateAppWidget(appWidgetIds, views);
		
		System.out.println("setwidget update");
		super.onUpdate(context, appWidgetManager, appWidgetIds);
	}

	@Override
	public void onAppWidgetOptionsChanged(Context context, 
			AppWidgetManager appWidgetManager, int appWidgetId,
			Bundle newOptions) {
		super.onAppWidgetOptionsChanged(context, appWidgetManager, appWidgetId,
				newOptions);
	}

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		super.onDeleted(context, appWidgetIds);
	}

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

	@Override
	public void onDisabled(Context context) {
		super.onDisabled(context);
	}
	
	private void updateWidget(Context context, int visible, int gone1, int gone2, int gone3) {
		//RemoteViews處理異進程中的View
		RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.collections_view_widget);
		
		views.setViewVisibility(visible, View.VISIBLE);
		views.setViewVisibility(gone1, View.GONE);
		views.setViewVisibility(gone2, View.GONE);
		views.setViewVisibility(gone3, View.GONE);
		
		if (visible != R.id.viewflipper) {//viewflipper 不是 繼承自AbsListView  or  AdapterViewAnimator  的view
			Intent intent = new Intent(context, WidgetSetService.class);
			views.setRemoteAdapter(visible, intent);//設置集合的adapter為intent指定的service
			views.setEmptyView(visible, R.id.tv_empty);//指定集合view為空時顯示的view
			
			Intent toIntent = new Intent(CLICK_ITEM_ACTION);
			PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 200, toIntent, PendingIntent.FLAG_UPDATE_CURRENT);
			/*
			 * setPendingIntentTemplate 設置pendingIntent 模板
			 * setOnClickFillInIntent   可以將fillInIntent 添加到pendingIntent中
			 */
			views.setPendingIntentTemplate(visible, pendingIntent);
			
		} else if (visible == R.id.viewflipper) {
//			views.setPendingIntentTemplate(R.id.viewflipper, pendingIntentTemplate);
		}
		
		AppWidgetManager am = AppWidgetManager.getInstance(context);
		int[] appWidgetIds = am.getAppWidgetIds(new ComponentName(context, WidgetSetProvider.class));
		for (int i = 0; i < appWidgetIds.length; i++) {
			am.updateAppWidget(appWidgetIds[i], views); //更新 實例
		}
		
	}
	
}

      運行的周期函數

      \

      點擊stackview的效果圖




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