Question

我是初学Android开发人员，在制作示例应用时尝试学习内容。

我的MainActivity的onCreate（）执行一个AsyncTask，它为我的RecyclerView提取数据。 AsyncTask需要Root访问权限并为其“询问”。

我的问题是MainActivity的布局在根提示出现之前不会绘制，我点击grant \ deny。

如何预先绘制布局？

提前致谢!!!

的onCreate（）：

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
...
DataFetcher dataFetcher = new DataFetcher();
dataFetcher.execute("");

dataFetcher：

@Override
    protected void onPreExecute() {
        super.onPreExecute();
        if(!canRunRootCommands()) {
            Log.e("DataFetcher", "No Root Access");
            cancel(true);
        }
    }
/***********************************************************************/
    //Root Check method
    //Credit: http://muzikant-android.blogspot.co.il/2011/02/how-to-get-root-access-and-execute.html

    /***********************************************************************/
    private boolean canRunRootCommands() {
        boolean retval = false;
        Process suProcess;

        try {
            suProcess = Runtime.getRuntime().exec("su");

            DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
            DataInputStream osRes = new DataInputStream(suProcess.getInputStream());

            if (null != os && null != osRes) {
                // Getting the id of the current user to check if this is root
                os.writeBytes("id\n");
                os.flush();

                String currUid = osRes.readLine();
                boolean exitSu = false;
                if (null == currUid) {
                    retval = false;
                    exitSu = false;
                    Log.d("ROOT", "Can't get root access or denied by user");
                } else if (true == currUid.contains("uid=0")) {
                    retval = true;
                    exitSu = true;
                    Log.d("ROOT", "Root access granted");
                } else {
                    retval = false;
                    exitSu = true;
                    Log.d("ROOT", "Root access rejected: " + currUid);
                }

                if (exitSu) {
                    os.writeBytes("exit\n");
                    os.flush();
                }
            }
        } catch (Exception e) {
            // Can't get root !
            // Probably broken pipe exception on trying to write to output stream (os) after su failed, meaning that the device is not rooted

            retval = false;
            Log.d("ROOT", "Root access rejected [" + e.getClass().getName() + "] : " + e.getMessage());
        }

        return retval;
    }

Answer 1

将onPreExecute的“canRunRootCommands（）”调用移动到doInBackground，以确保它不在UI线程上运行。

应用程序布局不会绘制，直到root权限被授予\拒绝

1 个答案: