获取未安装APK文件的图标

最新推荐文章于 2024-06-18 10:39:58 发布

转载最新推荐文章于 2024-06-18 10:39:58 发布 · 992 阅读

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本文介绍了一种通过解析APK文件来获取应用图标的方法。利用反射机制调用PackageParser类的相关方法，结合AssetManager和Resources类，实现了根据指定的文件路径和图标资源ID加载图标的功能。

Drawable getDrawableForMimetype(File file, String mimetype) {
        String PATH_PackageParser = "android.content.pm.PackageParser";
        String PATH_AssetManager = "android.content.res.AssetManager";
        try {
            String apkPath = file.getAbsolutePath();
            Class pkgParserCls = Class.forName(PATH_PackageParser);
            Class[] typeArgs = new Class[1];
            typeArgs[0] = String.class;
            Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
            Object[] valueArgs = new Object[1];
            valueArgs[0] = apkPath;
            Object pkgParser = pkgParserCt.newInstance(valueArgs);
            DisplayMetrics metrics = new DisplayMetrics();
            metrics.setToDefaults();
            typeArgs = new Class[4];
            typeArgs[0] = File.class;
            typeArgs[1] = String.class;
            typeArgs[2] = DisplayMetrics.class;
            typeArgs[3] = Integer.TYPE;
            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage", typeArgs);
            valueArgs = new Object[4];
            valueArgs[0] = new File(apkPath);
            valueArgs[1] = apkPath;
            valueArgs[2] = metrics;
            valueArgs[3] = 0;
            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);
            Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");
            ApplicationInfo info = (ApplicationInfo) appInfoFld.get(pkgParserPkg);
            Class assetMagCls = Class.forName(PATH_AssetManager);
            Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);
            Object assetMag = assetMagCt.newInstance((Object[]) null);
            typeArgs = new Class[1];
            typeArgs[0] = String.class;
            Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath", typeArgs);
            valueArgs = new Object[1];
            valueArgs[0] = apkPath;
            assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
            Resources res = context.getResources();
            typeArgs = new Class[3];
            typeArgs[0] = assetMag.getClass();
            typeArgs[1] = res.getDisplayMetrics().getClass();
            typeArgs[2] = res.getConfiguration().getClass();
            Constructor resCt = Resources.class.getConstructor(typeArgs);
            valueArgs = new Object[3];
            valueArgs[0] = assetMag;
            valueArgs[1] = res.getDisplayMetrics();
            valueArgs[2] = res.getConfiguration();
            res = (Resources) resCt.newInstance(valueArgs);
            CharSequence label = null;
            if (info.labelRes != 0) {
                label = res.getText(info.labelRes);
            }
            if (info.icon != 0) {
                Drawable icon = res.getDrawable(info.icon);
                return icon;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
		return null;
    }