如何在我的Android应用程序上打印PHP echo？

问题描述

我对android和PHP编程还很陌生，我现在在从php页面打印我的echo语句时遇到了问题，这很简单：

I'm fairly new to android and PHP programming and I am currently running into a problem printing my echo statement from my php page, which is as simple as:

    <?php
    echo "Hey there response!";
    ?>

我目前在MainActivity中使用的是：

What I am currently using in my MainActivity is:

        setContentView(R.layout.activity_main);

    TextView txtView = (TextView) findViewById(R.id.txt);

    //ASYNC WAY
    new GetData(txtView).execute("");

其中AsyncTask的定义是：

Where AsyncTask is defined by:

private class GetData extends AsyncTask<String, Void, String>{
    private TextView display;


    GetData(TextView view){
        this.display = view;
        display = (TextView) findViewById(R.id.txt);
    }

    protected String doInBackground(String... message){
        HttpClient httpclient;
        HttpGet request;
        HttpResponse response = null;
        String result = "error0";
        try{
            httpclient = new DefaultHttpClient();
            request = new HttpGet("http://localhost/php/wamp.php");
            response = httpclient.execute(request);
        } catch (Exception e){
            result = "error1";
        }

        try{
            BufferedReader rd = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent()));
            String line="";
            while((line = rd.readLine()) != null){
                result = result + line;
            }
        } catch(Exception e){
            result = "error2";
        }
        return result;
    }

    protected void onPostExecute(String result){
        this.display.setText(result);
    }
}

txtView中的消息变为error2，我有不知道为什么。

The message in the txtView becomes error2, and I have no idea why.

编辑
我本来是使用非AsyncTask方法读取输入流的，但是我已经切换到AsyncTask由于网络错误。但是，由于我的应用程序中没有得到正确的回显，问题仍然存在。

EDITI was originally using a non-AsyncTask method of reading in input stream but I have switch to AsyncTask due to Networking error. The problem still persists though since I am not getting the corrent echo in my application.

推荐答案

对于yanki来说可能为时已晚，但

This is probably too late for yanki but for anybody else that comes across this page.

我用yanki的代码尝试了此操作，并得到了与他错误2相同的错误。那时，我注意到我没有更新清单文件以允许互联网权限。

I tried it with yanki's code and got the same error as him "error 2". I noticed then that I hadn't updated the manifest file to allow internet permissions.

 <uses-permission android:name="android.permission.INTERNET" />

我再次运行它，效果很好。因此，使用yanki的代码并在清单文件中输入Internet权限，程序就可以运行。

I ran it again and it worked perfectly. So using yanki's code and entering the internet permissions in the manifest file the program should work.

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