代码获取apk包信息

String apkPath="sdcard/download/xxx.apk";
PackageManager pm = getPackageManager();    
PackageInfo info = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);      
ApplicationInfo appInfo = info.applicationInfo;    
String appName = pm.getApplicationLabel(appInfo).toString();
//得到安装包名称  
String packageName = appInfo.packageName; 
//得到版本信息  
String version=info.versionName; 
String code=info.versionCode;        
//图标信息 
Drawable icon = pm.getApplicationIcon(appInfo);

2.2之后  获取图标方法没用了需要自己解析图标

//此方法是转载(非原创)
private Drawable getAPKIcon(String apkPath) {
	String PATH_PackageParser = "android.content.pm.PackageParser";
	String PATH_AssetManager = "android.content.res.AssetManager";
	try {
	    // apk包的文件路径  
	    // 这是一个Package 解释器, 是隐藏的  
	    // 构造函数的参数只有一个, apk文件的路径  
	    // PackageParser packageParser = new PackageParser(apkPath);  
	    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);
	    // 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况  
	    DisplayMetrics metrics = new DisplayMetrics();
	    metrics.setToDefaults();
	    // PackageParser.Package mPkgInfo = packageParser.parsePackage(new  
	    // File(apkPath), apkPath,  
	    // metrics, 0);  
	    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);
	    // 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开  
	    // ApplicationInfo info = mPkgInfo.applicationInfo;  
	    Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");
	    ApplicationInfo info = (ApplicationInfo) appInfoFld.get(pkgParserPkg);
	    // uid 输出为"-1"，原因是未安装，系统未分配其Uid。  
	    Log.d("ANDROID_LAB", "pkg:" + info.packageName + " uid=" + info.uid);
	    // Resources pRes = getResources();  
	    // AssetManager assmgr = new AssetManager();  
	    // assmgr.addAssetPath(apkPath);  
	    // Resources res = new Resources(assmgr, pRes.getDisplayMetrics(),  
	    // pRes.getConfiguration());  
	    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 = mContext.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;
    }