// 获取ROOT权限
public void get_root(){

    if (is_root()){
        Toast.makeText(mCtx, "已经具有ROOT权限!", Toast.LENGTH_LONG).show();
    }
    else{
        try{
            progress_dialog = ProgressDialog.show(mCtx,
                    "ROOT", "正在获取ROOT权限...", true, false);
            Runtime.getRuntime().exec("su");
        }
        catch (Exception e){
            Toast.makeText(mCtx, "获取ROOT权限时出错!", Toast.LENGTH_LONG).show();
        }
    }

}