获取已安装启动器的所有应用程序图标列表,并在远程视图上显示每个图标

时间:2014-01-31 08:22:29

标签: intentfilter android-package-managers android-applicationinfo

我可以使用意图过滤器来收集所有已安装的启动器的列表。麻烦的是拉出对应用程序图标的int引用。下面的代码捕获NameNotFoundException错误。

public RemoteViews getViewAt(int position) {
    PackageManager pm = mContext.getPackageManager();
    Intent i = new Intent("android.intent.action.MAIN");
    i.addCategory("android.intent.category.HOME");
    List<ResolveInfo> lst = pm.queryIntentActivities(i, 0);


    RemoteViews rv = new RemoteViews(mContext.getPackageName(), R.layout.widget_item);

    if(position < lst.size()) {

        try {
            ApplicationInfo ai = pm.getApplicationInfo(lst.get(position).activityInfo.name, 0);
            int iconId = ai.icon;
            rv.setInt(R.id.widget_item, "setBackgroundResource", iconId);
        } catch (NameNotFoundException e) {
            //Toast.makeText(mContext, "Fail: " + e, Toast.LENGTH_SHORT).show();
            Log.d("Error: ", e.toString());
        }
    }

问题在于这一行:

ApplicationInfo ai = pm.getApplicationInfo(lst.get(position).activityInfo.name, 0);

activityInfo.name不返回包名吗?

1 个答案:

答案 0 :(得分:0)

通过以下更改解决了我的问题。

而不是像这样获得对图标的int引用:

ApplicationInfo ai = pm.getApplicationInfo(lst.get(position).activityInfo.name, 0);
int iconId = ai.icon;

我使用以下代码将图标作为Drawable:

Drawable icon = lst.get(position).activityInfo.applicationInfo.loadIcon(pm);

然后我必须将图标从Drawable转换为Bitmap:

Bitmap iconBit = drawableToBitmap(icon);

...

public static Bitmap drawableToBitmap (Drawable drawable) {
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable)drawable).getBitmap();
    }

    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap); 
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}

最后,不要像这样尝试更改ImageView的后台资源:

rv.setInt(R.id.widget_item, "setBackgroundResource", iconId);

我使用了setImageViewBitmap:

rv.setImageViewBitmap(R.id.widget_item, iconBit);

我希望这对其他人有帮助。我用以下帖子中的Kabuko的答案将Drawable转换为位图: How to convert a Drawable to a Bitmap?