Android编程实现应用获取包名、版本号、权限等信息的方法

/*** 获取当前应用程序的包名* @param context 上下文对象* @return 返回包名*/public static String getAppProcessName(Context context) {    //当前应用pid    int pid = android.os.Process.myPid();    //任务管理类    ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    //遍历所有应用    List<ActivityManager.RunningAppProcessInfo> infos = manager.getRunningAppProcesses();    for (ActivityManager.RunningAppProcessInfo info : infos) {      if (info.pid == pid)//得到当前应用        return info.processName;//返回包名    }    return "";}/*** 获取程序 图标* @param context* @param packname 应用包名* @return*/public Drawable getAppIcon(Context context,String packname){   try {     //包管理操作管理类     PackageManager pm = context.getPackageManager();     //获取到应用信息       ApplicationInfo info = pm.getApplicationInfo(packname, 0);       return info.loadIcon(pm);    } catch (NameNotFoundException e) {      e.printStackTrace();    }  return null;}/*** 获取程序的版本号* @param context* @param packname* @return*/public String getAppVersion(Context context,String packname){     //包管理操作管理类   PackageManager pm = context.getPackageManager();     try {       PackageInfo packinfo = pm.getPackageInfo(packname, 0);       return packinfo.versionName;      } catch (NameNotFoundException e) {        e.printStackTrace();      }    return packname;}/*** 获取程序的名字* @param context* @param packname* @return*/public String getAppName(Context context,String packname){ //包管理操作管理类   PackageManager pm = context.getPackageManager();     try {         ApplicationInfo info = pm.getApplicationInfo(packname, 0);         return info.loadLabel(pm).toString();      } catch (NameNotFoundException e) {        // TODO Auto-generated catch block        e.printStackTrace();      }    return packname;}/** 获取程序的权限*/public String[] getAllPermissions(Context context,String packname){     try {       //包管理操作管理类       PackageManager pm = context.getPackageManager();       PackageInfo packinfo =  pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);       //获取到所有的权限       return packinfo.requestedPermissions;      } catch (NameNotFoundException e) {        e.printStackTrace();      }    return null;}/*** 获取程序的签名* @param context* @param packname* @return*/public static String getAppSignature(Context context,String packname){     try {       //包管理操作管理类       PackageManager pm = context.getPackageManager();       PackageInfo packinfo = pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);       //获取当前应用签名       return packinfo.signatures[0].toCharsString();      } catch (NameNotFoundException e) {        e.printStackTrace();      }    return packname;}/*** 获取当前展示 的Activity名称* @return*/private static String getCurrentActivityName(Context context){    ActivityManager activityManager=(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    String runningActivity=activityManager.getRunningTasks(1).get(0).topActivity.getClassName();    return runningActivity;}