获取未安装apk图标

最新推荐文章于 2022-11-28 16:04:39 发布

tsyjssr

最新推荐文章于 2022-11-28 16:04:39 发布

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分类专栏： android 文章标签： resources constructor object exception null string

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本文介绍如何在真机上通过反射机制获取未安装apk的应用图标，分享一种不同于常见方法的简便方式。

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在网上找了一圈都是以下代码，在模拟器上测试可以获取apk图标，真机上却无法显示，唉~~

public void getUninatllApkInfo(Context context, String archiveFilePath) {  
        PackageManager pm = context.getPackageManager();  
        PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);  
        if (info != null) {  
            ApplicationInfo appInfo = info.applicationInfo;   
            Drawable icon = pm.getApplicationIcon(appInfo);
            ImageView image = (ImageView) findViewById(R.id.apk_icon);  
            image.setVisibility(View.VISIBLE);
            image.setImageDrawable(icon);
        }  
    }

跟踪了一下主要是 PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);获取没有问题，可以得到Application的所有信息，但是再调用PackageManager获取apk图标却找不到，只返回了apk默认图标（绿色机器人），由于PackageManager是在当前应用内查找，所以查找不到。

依据网上查找的资料，利用反射机制构建一个未安装apk的Resource对象，来访问apk内的资源。

public static Resources getResources(String apkPath) throws Exception {
    	String PATH_AssetManager = "android.content.res.AssetManager";    	
    	Class assetMagCls = Class.forName(PATH_AssetManager);  
        Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);  
        Object assetMag = assetMagCt.newInstance((Object[]) null);  
        Class[] typeArgs = new Class[1];  
        typeArgs[0] = String.class;  
        Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath",  
                typeArgs);  
        Object[] valueArgs = new Object[1];  
        valueArgs[0] = apkPath;  
        assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
    	Resources res = 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);        
        return res;
    }

通过PackageManager获取ApplicationInfo，利用Resource获取图标如下

public static Drawable getUninstallAPKIcon(Context context,String apkPath) {  
	PackageManager pm = context.getPackageManager();  
        PackageInfo info = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);        
        Resources res = null;
        try {
		res = getResources(context,apkPath);
	} catch (Exception e) {
		return null;
	}
	if(info != null){
		ApplicationInfo appInfo = info.applicationInfo;
		return res.getDrawable(appInfo.icon); 
	}
		
	return null;		
    }

最近在网上找到另一种方便方式获取apk图标的方式，和大家分享一下

public Drawable loadUninstallApkIcon(Context context, String archiveFilePath) {
		PackageManager pm = context.getPackageManager();
		PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);

		ApplicationInfo appInfo = info.applicationInfo;
		appInfo.sourceDir = archiveFilePath;
		appInfo.publicSourceDir = archiveFilePath;

		return appInfo.loadIcon(pm);

	}