【发布时间】:2014-01-09 14:38:42
【问题描述】:
我正在创建一个简单的 Android 小部件,它具有在应用程序中打开不同活动的按钮。
public class ExampleAppWidgetProvider extends AppWidgetProvider {
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
final int N = appWidgetIds.length;
Log.i("ExampleWidget", "Updating widgets " + Arrays.asList(appWidgetIds));
// Perform this loop procedure for each App Widget that belongs to this
// provider
for (int i = 0; i < N; i++) {
int appWidgetId = appWidgetIds[i];
// Create an Intent to launch ExampleActivity
Intent intentForHome = new Intent(context, WidgetExampleActivity.class);
PendingIntent pendingIntentForHome = PendingIntent.getActivity(context, 0, intentForHome, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget1);
views.setOnClickPendingIntent(R.id.button, pendingIntentForHome);
// Create an Intent to launch Second Activity
Intent intentForSecond = new Intent(context, SecondActivity.class);
PendingIntent pendingIntentForSecond = PendingIntent.getActivity(context, 0, intentForSecond, 0);
// Get the layout for the App Widget and attach an on-click listener
// to the button
views.setOnClickPendingIntent(R.id.button2, pendingIntentForSecond);
// Tell the AppWidgetManager to perform an update on the current app
// widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
}
这可以通过每个按钮打开正确的活动。 但我只是想知道, updatePeriodMillis 是干什么用的。我不需要小部件中的任何内容来更新,只希望按钮打开应用程序。我可以摆脱更新部分吗?我不希望我的应用程序不断更新小部件。
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="294dp"
android:minHeight="72dp"
android:updatePeriodMillis="10000"
android:initialLayout="@layout/widget1">
</appwidget-provider>
这也是从 Widget 执行按钮单击的正确方法。我在一些教程中看到它的做法有所不同? 谢谢。
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