在Android中，如何在同一窗口小部件的多个实例加以区分？ [英] In Android, how to distinguish between multiple instances of the same widget?
问题描述
我正在做一个小部件。它将被点击时的随机数字。当我加入这个小工具的主屏幕上的多，他们开始在同一时间点击时产生的随机数。我要的是点击一个窗口小部件时，只更新自己和周围的人非。请帮帮我。
我的code：类UpdateWidgetService
@覆盖
公共无效调用onStart（意向意图，诠释startId）{
//创建一些随机数据
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance（this.getApplicationContext（））;
INT [] = allWidgetIds intent.getIntArrayExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS）;
对于（INT为widgetid：allWidgetIds）{
//创建一些随机数据
INT数=（新随机（）nextInt（100）。）; RemoteViews remoteViews =新的RemoteViews（this.getApplicationContext（）getPackageName（），R.layout.widget_layout。）;
Log.w（WidgetExample，将String.valueOf（数））;
//设置文本
remoteViews.setTextViewText（R.id.update，随机+将String.valueOf（数））; //注册一个onClickListener
意图clickIntent =新意图（this.getApplicationContext（），MyWidgetProvider.class）;
clickIntent.setAction（AppWidgetManager.ACTION_APPWIDGET_UPDATE）;
clickIntent.putExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS，为widgetid）; 的PendingIntent的PendingIntent = PendingIntent.getBroadcast（getApplicationContext（），为widgetid，clickIntent，0）;
remoteViews.setOnClickPendingIntent（R.id.btn_update，的PendingIntent）;
appWidgetManager.updateAppWidget（为widgetid，remoteViews）;
}
stopSelf（）;
super.onStart（意向，startId）;
}
类MyWidgetProvider：
@覆盖
公共无效的onUpdate（上下文的背景下，AppWidgetManager appWidgetManager，INT [] appWidgetIds）{
Log.w（LOG所谓的onUpdate法）;
//获取所有ID
组件名thisWidget =新的组件名（背景下，MyWidgetProvider.class）;
INT [] = allWidgetIds appWidgetManager.getAppWidgetIds（thisWidget）; //构建意图调用服务
意向意图=新意图（context.getApplicationContext（），UpdateWidgetService.class）;
intent.putExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS，allWidgetIds）; //更新通过服务窗口小部件
context.startService（意向）;
}
小部件的每一个都由特定的ID标识。你的 UpdateWidgetService 类看起来是正确的循环在ID的。
问题是在你的 MyWidgetProvider.onUpdate（）方法。这code是错误的：
//获取所有ID
组件名thisWidget =新的组件名（背景下，MyWidgetProvider.class）;
INT [] = allWidgetIds appWidgetManager.getAppWidgetIds（thisWidget）;
注释解释了为什么这是错的 - 它得到的所有小部件的ID
看看你的onUpdate（）方法的参数：
-
公共无效的onUpdate（上下文的背景下，AppWidgetManager appWidgetManager，INT [] appWidgetIds）
在这里，你可以看到小部件的阵列的ID是给你，你必须将此数组传递给您的更新服务：
-
INT [] appWidgetIds
所以你的code应该结束了寻找这样的：
@覆盖
公共无效的onUpdate（上下文的背景下，AppWidgetManager appWidgetManager，INT [] appWidgetIds）{
Log.w（LOG所谓的onUpdate法）; //构建意图调用服务
意向意图=新意图（context.getApplicationContext（），UpdateWidgetService.class）;
intent.putExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS，appWidgetIds）; //更新通过服务窗口小部件
context.startService（意向）;
}
这样，你只更新部件，系统发送给您，而不是每次都更新所有的人。
I'm making a widget. It will random a number when clicked. When I add multiple of this widget on home screen, they start to generate random number at the same time when clicked. What I want is when a widget is clicked it only updates itself and non of the others around it. Please, help me. My code: class UpdateWidgetService
@Override
public void onStart(Intent intent, int startId) {
// create some random data
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this.getApplicationContext());
int[] allWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
for (int widgetId : allWidgetIds) {
// create some random data
int number = (new Random().nextInt(100));
RemoteViews remoteViews = new RemoteViews(this.getApplicationContext().getPackageName(), R.layout.widget_layout);
Log.w("WidgetExample", String.valueOf(number));
// Set the text
remoteViews.setTextViewText(R.id.update, "Random: " + String.valueOf(number));
// Register an onClickListener
Intent clickIntent = new Intent(this.getApplicationContext(), MyWidgetProvider.class);
clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, widgetId);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), widgetId, clickIntent, 0);
remoteViews.setOnClickPendingIntent(R.id.btn_update, pendingIntent);
appWidgetManager.updateAppWidget(widgetId, remoteViews);
}
stopSelf();
super.onStart(intent, startId);
}
class MyWidgetProvider:
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
Log.w(LOG, "onUpdate method called");
// Get all ids
ComponentName thisWidget = new ComponentName(context, MyWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
// Build the intent to call the service
Intent intent = new Intent(context.getApplicationContext(), UpdateWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
// Update the widgets via the service
context.startService(intent);
}
Each of your widgets is identified by a specific ID. Your UpdateWidgetService class looks like it is correctly looping over the ID's.
The issue is in your MyWidgetProvider.onUpdate() method. This code is wrong:
// Get all ids
ComponentName thisWidget = new ComponentName(context, MyWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
The comment explains why it is wrong - it gets all the widget ID's.
Look at the parameters in your onUpdate() method:
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
Here you can see an array of widget ID's is given to you, and you must pass this array to your update service:
int[] appWidgetIds
So your code should end up looking something like this:
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
Log.w(LOG, "onUpdate method called");
// Build the intent to call the service
Intent intent = new Intent(context.getApplicationContext(), UpdateWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
// Update the widgets via the service
context.startService(intent);
}
That way you are only updating the widgets that the system sends to you, instead of updating all of them each time.
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