主屏幕小部件文本视图未更新

Posted 2023-04-15

【中文标题】主屏幕小部件文本视图未更新

【英文标题】：home screen widget text view not updating

【发布时间】：2013-05-09 15:09:16

【问题描述】：

这是我的程序的代码 -

package com.nadeem.todos;

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.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.widget.RemoteViews;

public class todo_widget extends AppWidgetProvider 
private SQLiteDatabase db;
private TodoSQLiteHelper dbHelper;
String[] widget_title =  "", "", "", "", "", "" ;
String[] widget_content =  "", "", "", "", "", "" ;
public static String ACTION_WIDGET_REFRESH = "ActionReceiverRefresh";
public static String ACTION_WIDGET_OPEN = "ActionReceiverOpen";

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

    Intent intent = new Intent(context, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
            intent, PendingIntent.FLAG_UPDATE_CURRENT);

    RemoteViews views = new RemoteViews(context.getPackageName(),
            R.layout.widget_layout);
    views.setOnClickPendingIntent(R.id.contentw2, pendingIntent);
    views.setOnClickPendingIntent(R.id.contentw3, pendingIntent);
    Intent i1 = new Intent(context, todo_widget.class);
    i1.setAction(ACTION_WIDGET_REFRESH);

    PendingIntent pi = PendingIntent.getBroadcast(context, 0, i1,
            PendingIntent.FLAG_UPDATE_CURRENT);
    views.setOnClickPendingIntent(R.id.flip, pi);
    views.setOnClickPendingIntent(R.id.contentw1, pi);
    appWidgetManager.updateAppWidget(appWidgetIds, views);


@Override
public void onReceive(Context context, Intent intent) 
    AppWidgetManager appWidgetManager = AppWidgetManager
            .getInstance(context);

    int[] ids = AppWidgetManager.getInstance(context).getAppWidgetIds(
            new ComponentName(context, todo_widget.class));
    RemoteViews views = new RemoteViews(context.getPackageName(),
            R.layout.widget_layout);
    if (intent.getAction().equals(ACTION_WIDGET_REFRESH)) 
        views.setTextViewText(R.id.titlew1, widget_title[3]);
        views.setTextViewText(R.id.contentw1, widget_content[3]);
        appWidgetManager.updateAppWidget(ids, views);

     else if (intent.getAction().equals(
            AppWidgetManager.ACTION_APPWIDGET_UPDATE)) 
        dbHelper = new TodoSQLiteHelper(context);
        db = dbHelper.getWritableDatabase();
        String[] tableColumns = new String[]  "_id", "title", "todo" ;

        int j = 0;

        Cursor cursor = db.query("todos", tableColumns, null, null, null,
                null, null);
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) 

            if (j < 6) 
                widget_title[j] = cursor.getString(1);
                widget_content[j] = cursor.getString(2);
            
            j++;

            cursor.moveToNext();
        
        db.close();
        final int N = ids.length;
        for (int i = 0; i < N; i++) 
            int appWidgetId = ids[i];
            views.setTextViewText(R.id.titlew1, widget_title[0]);
            views.setTextViewText(R.id.titlew2, widget_title[1]);
            views.setTextViewText(R.id.titlew3, widget_title[2]);
            views.setTextViewText(R.id.contentw1, widget_content[0]);
            views.setTextViewText(R.id.contentw2, widget_content[1]);
            views.setTextViewText(R.id.contentw3, widget_content[2]);
            appWidgetManager.updateAppWidget(appWidgetId, views);

        
    
    super.onReceive(context, intent);

    

我的问题是当 Action_widget_refresh 为真时，onRecieve 方法中的文本视图没有得到更新。我在文本视图上设置了待处理的意图，以便在单击它时文本视图（R.id.content1）的文本会发生变化。但是当我点击文本视图时，文本视图消失了。我不知道为什么会这样。除此之外，代码运行良好。

【参考方案1】：

每次调用appWidgetManager.updateAppWidget() 时，您传入的 RemoveViews 都需要“包含小部件的完整表示”。这意味着您每次都需要为 TextViews 设置文本，而不仅仅是在文本应该更改时。如果只设置更改的文本，您将失去想要保持不变的文本。

【参考方案2】：

我认为你应该这样做：

if (intent.getAction().equals(ACTION_WIDGET_REFRESH)) 
    views.setTextViewText(R.id.titlew1, widget_title[3]);
    views.setTextViewText(R.id.contentw1, widget_content[3]);
    final int N = ids.length;
    for (int i = 0; i < N; i++) 
        int appWidgetId = ids[i];
        appWidgetManager.updateAppWidget(appWidgetId, views);