在Android中获取App图标

Question

我在检索安装的Android应用程序的图标时遇到了一些麻烦.以下代码返回所有应用程序的图标,但是,某些应用程序返回带有小图标(可能来自drawable - ldpi文件夹),而某些应用程序带有大图标.

List<PackageInfo> package = getPackageManager().getInstalledPackages(0);

for(PackageInfo p : package){
    iApp.icon = p.applicationInfo.loadIcon(getPackageManager()); 
}

我如何获得大小相同的图标,就像Android的"管理应用程序"部分一样？

Answer 1

应用可能只有不同大小的图标.Android设置应用加载与您一样的图标.它在显示时缩放图标.

这是来自packages/apps/Settings/res/layout/manage_applications_item.xml的片段:

<ImageView android:id="@+id/app_icon"
    android:layout_width="@android:dimen/app_icon_size"
    android:layout_height="@android:dimen/app_icon_size"
    android:layout_marginRight="11dip"
    android:layout_gravity="center_vertical"
    android:scaleType="fitCenter"/>

Answer 2

我想在之前的回答中添加适用于Android 3.0及更高版本的内容.

您可以注意到以此标准方式检索的图标(我的意思是applicationInfo.loadIcon和其他典型方法)小于您在启动器应用程序中看到的图标.向上扩展只会使图标变得模糊.如果你想要大图标,你可以使用下一个代码(我从启动器源代码中获取它,你可以在这里找到并稍微改动一下).注意activityManager.getLauncherLargeIconDensity方法.

public Drawable getFullResDefaultActivityIcon() {
    return getFullResIcon(Resources.getSystem(), android.R.mipmap.sym_def_app_icon);
}

public Drawable getFullResIcon(Resources resources, int iconId) {
    Drawable d;
    try {
        ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
        int iconDpi = activityManager.getLauncherLargeIconDensity();
        d = resources.getDrawableForDensity(iconId, iconDpi);
    } catch (Resources.NotFoundException e) {
        d = null;
    }

    return (d != null) ? d : getFullResDefaultActivityIcon();
}

public Drawable getFullResIcon(String packageName, int iconId) {
    Resources resources;
    try {
        resources = mContext.getPackageManager().getResourcesForApplication(packageName);
    } catch (PackageManager.NameNotFoundException e) {
        resources = null;
    }
    if (resources != null) {
        if (iconId != 0) {
            return getFullResIcon(resources, iconId);
        }
    }
    return getFullResDefaultActivityIcon();
}

public Drawable getFullResIcon(ResolveInfo info) {
    return getFullResIcon(info.activityInfo);
}

public Drawable getFullResIcon(ActivityInfo info) {
    Resources resources;
    try {
        resources = mContext.getPackageManager().getResourcesForApplication(info.applicationInfo);
    } catch (PackageManager.NameNotFoundException e) {
        resources = null;
    }
    if (resources != null) {
        int iconId = info.getIconResource();
        if (iconId != 0) {
            return getFullResIcon(resources, iconId);
        }
    }
    return getFullResDefaultActivityIcon();
}

private Drawable getAppIcon(ResolveInfo info) {
    return getFullResIcon(info.activityInfo);
}

希望它可以帮助某人.

Answer 3

虽然这已经回答了很久,但这是完整的功能.希望它会帮助别人.

要获取图标,您应该查询不同dpi的图标.

试试这个:

public static Drawable getIconFromPackageName(String packageName, Context context)
    {
        PackageManager pm = context.getPackageManager();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
        {
            try
            {
                PackageInfo pi = pm.getPackageInfo(packageName, 0);
                Context otherAppCtx = context.createPackageContext(packageName, Context.CONTEXT_IGNORE_SECURITY);

                int displayMetrics[] = {DisplayMetrics.DENSITY_XHIGH, DisplayMetrics.DENSITY_HIGH, DisplayMetrics.DENSITY_TV};

                for (int displayMetric : displayMetrics)
                {
                    try
                    {
                        Drawable d = otherAppCtx.getResources().getDrawableForDensity(pi.applicationInfo.icon, displayMetric);
                        if (d != null)
                        {
                            return d;
                        }
                    }
                    catch (Resources.NotFoundException e)
                    {
//                      Log.d(TAG, "NameNotFound for" + packageName + " @ density: " + displayMetric);
                        continue;
                    }
                }

            }
            catch (Exception e)
            {
                // Handle Error here
            }
        }

        ApplicationInfo appInfo = null;
        try
        {
            appInfo = pm.getApplicationInfo(packageName, PackageManager.GET_META_DATA);
        }
        catch (PackageManager.NameNotFoundException e)
        {
            return null;
        }

        return appInfo.loadIcon(pm);
    }