最近用到的几个工具方法

1.android中得到一个apk文件的包名（未证实）

public String getPackageName(String archiveFilePath,Context context){
        PackageManager pm = context.getPackageManager();  
        PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);  
        if(info != null){  
            ApplicationInfo appInfo = info.applicationInfo;  
            String appName = pm.getApplicationLabel(appInfo).toString();  
            String packageName = appInfo.packageName;  //得到安装包名称
            String version=info.versionName;       //得到版本信息     
            Toast.makeText(context, "packageName:"+packageName+";version:"+version, Toast.LENGTH_LONG).show();
            Drawable icon = pm.getApplicationIcon(appInfo);//得到图标信息
        }  
    }

2.java项目获取项目路径

/**
     * 获取项目所在路径(包括jar)
     * 
     * @return
     */
    private static String getProjectPath() {

        java.net.URL url = FirstClass.class.getProtectionDomain()
                .getCodeSource().getLocation();
        String filePath = null;
        try {
            filePath = java.net.URLDecoder.decode(url.getPath(), "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (filePath.endsWith(".jar"))
            filePath = filePath.substring(0, filePath.lastIndexOf("/") + 1);
        File file = new File(filePath);
        filePath = file.getAbsolutePath();
        return filePath;
    }

3.删除文件或者文件夹

/**
     * 删除文件或者文件夹
     * 
     * @param path
     */
    public static void deleteAllFilesOfDir(File path) {
        if (!path.exists())
            return;
        if (path.isFile()) {
            path.delete();
            return;
        }
        File[] files = path.listFiles();
        for (int i = 0; i < files.length; i++) {
            deleteAllFilesOfDir(files[i]);
        }
        path.delete();
    }