Question

我正在做一个需要每个应用程序的更高分辨率图标的应用程序。

我从今天早上开始做了一些研究，但没有找到任何答案。

以下是其中两个以及我的错误。

仅供参考，我已经从packagemanager中检索了所有“packageinfo”，我找到了我需要的一切，但高分辨率图标...

1。使用getDrawableForDensity：

ActivityInfo info = packageManager.getActivityInfo(componentName,     PackageManager.GET_META_DATA);

Resources resources;
try {
    resources = mPackageManager.getResourcesForApplication(
        info.applicationInfo);
} catch (PackageManager.NameNotFoundException e) {
resources = null;
}

if (resources != null) {
int iconId = info.getIconResource();
if (iconId != 0) {
    Drawable d;
    try {
        d = resources.getDrawableForDensity(iconId, DisplayMetrics.DENSITY_XHIGH);
    } catch (Resources.NotFoundException e) {
        d = null;
    }
    return d;
}
}

我的问题是我不明白要为componentName添加什么。如何使用packagemanager提供的信息“构建”它？

2.其他解决方案 Retrieving xhdpi app icons from packageManager?

// Get the application's resources
Resources res = mPackageManager.getResourcesForApplication(appInfo);

// Get a copy of the configuration, and set it to the desired resolution
Configuration config = res.getConfiguration();
Configuration originalConfig = new Configuration(config);
config.densityDpi = DisplayMetrics.DENSITY_XHIGH;

// Update the configuration with the desired resolution
DisplayMetrics dm = res.getDisplayMetrics();
res.updateConfiguration(config, dm);

// Grab the app icon
Drawable appIcon = res.getDrawable(appInfo.icon);

// Set our configuration back to what it was
res.updateConfiguration(originalConfig, dm);

对于这一行，我对这一行有疑问：

Drawable appIcon = res.getDrawable（appInfo.icon）;

我得到“icon”错误：

图标无法解析或不是字段

Answer 1

这只是猜测，因为我不是一个特别优秀的Android程序员，但是：在第一个解决方案中，您可以通过PackageManager类的getInstalledApplications（int标志）方法检索设备上安装的每个应用程序的列表。看到 http://developer.android.com/reference/android/content/pm/PackageManager.html#getInstalledApplications(int)

所以像这样的代码：

///This retrieves information on every application installed on device, see documentation 
///for flags
List<ApplicationInfo> applications = mPackageManager.getInstalledApplications(int flags);
///Then retrieve Resources for every application with looping through all the applications
for (ApplicationInfo info : applications) {
Resources res = mPackageManager.getResourcesForApplication(info);
///And now you can do what you already wrote yourself and try fetching icon for every
///'res' you did in the first solution.
}

这假设您要显示每个应用程序。

关于解决方案2：我假设appInfo是'ApplicationInfo'类。它有一个公共字段'icon'，它继承自'PackageItemInfo'类。确保你的appInfo是'PackageItemInfo'类的任何子类，它应该工作。如果它不起作用，则给定应用程序的Android manifest.xml可能有问题，并且它无法检索所需的整数。

您可以尝试通过'PackageManager'类的'getApplicationIcon'方法检索图标。再次

List<ApplicationInfo> applications = mPackageManager.getInstalledApplications(int flags);
List<Drawable> icons = new List<Drawable>;
for (ApplicationInfo app : applications) {
    icons.add(mPackageManager.getApplicationIcon(app));
}

当然，这意味着你要在应用程序列表中使用两次。

Answer 2

试试这个，它类似于你拥有的代码，但似乎对我有用：

//获取HiRes图标

             Drawable appIcon;
List<Application> applications = new ArrayList<Application>();
         for (ApplicationInfo item : getInstalledApplications(packageManager)) {

             try {
               Resources resourcesForApplication = packageManager.getResourcesForApplication(item);
               Configuration config = resourcesForApplication.getConfiguration();
               Configuration originalConfig = new Configuration(config);

               DisplayMetrics displayMetrics = resourcesForApplication.getDisplayMetrics();
               DisplayMetrics originalDisplayMetrics =  resourcesForApplication.getDisplayMetrics();
               displayMetrics.densityDpi =  DisplayMetrics.DENSITY_DEFAULT;
               resourcesForApplication.updateConfiguration(config, displayMetrics);

               appIcon = resourcesForApplication.getDrawable(item.icon);
               resourcesForApplication.updateConfiguration(originalConfig, originalDisplayMetrics);
             } catch (PackageManager.NameNotFoundException e) {
               Log.e("check", "error getting Hi Res Icon :", e);
               appIcon = item.loadIcon(packageManager);
             }

             Application app = new Application();
             app.setTitle(item.loadLabel(packageManager).toString());
             app.setPackageName(item.packageName);
             // app.setImage(item.loadIcon(packageManager));
             app.setImage(appIcon);
             applications.add(app);
           }
    }

如何使用程序包管理器查找高分辨率图标

2 个答案: