如何在扩展 appwidget 提供程序时在 android 中随机设置图像视图资源

Question

您好，我是 android 编程的新手，我需要一些帮助来设置我的小部件，我一直在尝试在小部件更新时随机设置图像视图资源，我已经尝试过了

Random r = new Random();
int min = 001;
int max = 721;
String name = "national" + r.nextInt(max - min + 1) + min;
int id = getResources().getIdentifier(name, "drawable", getPackageName());
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.source);
views.setOnClickPendingIntent(R.id.imgwidg, pendingIntent);
views.setImageViewResource(id);

但它不接受 getResources() 或 getIdentifier()

我该怎么办？

编辑：我也很确定它不会喜欢 001 那么我如何将数字格式化为 3 位数字？

编辑 2：（已解决）感谢@ci_ 和@blipinsk

public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    super.onUpdate(context,appWidgetManager,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 < appWidgetIds.length; i++) {
        Random r = new Random();
        int min = 1;
        int max = 721;
        int id3 = r.nextInt(max)+min;
        int id2 = id3 - 1;
        Resources res = context.getResources();
        String[] title = res.getStringArray(R.array.nationaltitles);
        String name = "national" + String.format("%03d",id3);
        int id = context.getResources().getIdentifier(name, "drawable", context.getPackageName());
        if (id == id){
            id = context.getResources().getIdentifier(name, "drawable", context.getPackageName());
            id2 = id3 - 1;
        }
        int appWidgetId = appWidgetIds[i];
        Intent intent = new Intent(context, SplashActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.source);
        views.setOnClickPendingIntent(R.id.imgwidg, pendingIntent);
        views.setImageViewResource(R.id.imgwidg, id);
        views.setTextViewText(R.id.tv2,title[id2]);
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }
}

Answer 1

getResources()是Context的一个方法。所有 AppWidgetProvider methods 都提供了一个 Context 作为参数，因此您可以使用它来调用 getResources() on.

要将整数格式化为特定宽度，您可以使用 [String.format()](http://developer.android.com/reference/java/lang/String.html#format(java.lang.String, java.lang.Object...))

即String.format("%03d", r.nextInt(max - min + 1) + min)

Answer 2

请务必将代码的开头更改为：

int min = 1;
int max = 721;
String name = "national" + String.format("%03d", r.nextInt(max - min + 1) + min);

这将格式化您的整数以匹配 XYZ 格式（如果需要，三位数带前导零）。

如何在扩展 appwidget 提供程序时在 android 中随机设置图像视图资源

How Do I set an Image view resource randomly in android while extending the appwidget provider

random

android

widget