Question

我正在尝试使用存储在服务器上的5个单独的.txt文件的内容填充5个单独的edittext框（只需单击一下按钮）。我可以使用下面的代码填充第一个edittext

package fromserver.lou.readfromweb;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

 String TextFileURL = "http://saturn.glyndwr.ac.uk/n3rds/Receipt.txt" ;
    TextView textView ;
    Button button ;
    URL url ;
    String TextHolder = "" , TextHolder2 = "";
    BufferedReader bufferReader ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = (TextView)findViewById(R.id.textView);
        button = (Button)findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                new GetNotePadFileFromServer().execute();

            }
        });

    }

    public class GetNotePadFileFromServer extends AsyncTask<Void, Void, Void>{

        @Override
        protected Void doInBackground(Void... params) {

            try {
                url = new URL(TextFileURL);

                bufferReader = new BufferedReader(new InputStreamReader(url.openStream()));

                while ((TextHolder2 = bufferReader.readLine()) != null) {

                    TextHolder += TextHolder2;
                }
                bufferReader.close();

            } catch (MalformedURLException malformedURLException) {

                // TODO Auto-generated catch block
                malformedURLException.printStackTrace();
                TextHolder = malformedURLException.toString();

            } catch (IOException iOException) {

                // TODO Auto-generated catch block
                iOException.printStackTrace();

                TextHolder = iOException.toString();
            }

            return null;

        }

        @Override
        protected void onPostExecute(Void finalTextHolder) {

            textView.setText(TextHolder);

            super.onPostExecute(finalTextHolder);
        }

    }



}

我想也许，如果我能以某种方式从主要活动中取出代码并拥有一个特殊的类，并为每个edittext执行五次它可能有效，但我无法做到。我试着将课程分开如下：

    package fromserver.lou.readfromweb;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {


    Button button ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = (TextView)findViewById(R.id.textView);
        button = (Button)findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                new GetNotePadFileFromServer().execute();

            }
        });

    }




}

并创建了一个新课程：

package fromserver.lou.readfromweb;

import android.os.AsyncTask;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by lou on 27/04/2017.
 */



public class GetNotePadFileFromServer extends AsyncTask<Void, Void, Void> {

    URL url ;
    String TextHolder = "" , TextHolder2 = "";
    BufferedReader bufferReader ;
    String TextFileURL = "http://saturn.glyndwr.ac.uk/n3rds/Receipt.txt" ;
    TextView textView ;

    @Override
    protected Void doInBackground(Void... params) {

        try {
            url = new URL(TextFileURL);

            bufferReader = new BufferedReader(new InputStreamReader(url.openStream()));

            while ((TextHolder2 = bufferReader.readLine()) != null) {

                TextHolder += TextHolder2;
            }
            bufferReader.close();

        } catch (MalformedURLException malformedURLException) {

            // TODO Auto-generated catch block
            malformedURLException.printStackTrace();
            TextHolder = malformedURLException.toString();

        } catch (IOException iOException) {

            // TODO Auto-generated catch block
            iOException.printStackTrace();

            TextHolder = iOException.toString();
        }

        return null;

    }

    @Override
    protected void onPostExecute(Void finalTextHolder) {

        textView.setText(TextHolder);

        super.onPostExecute(finalTextHolder);
    }

}

但是在主要活动中，textView保持红色，并且表示无法解析符号textview。

我打算这样做5次，只是稍微更改每个类，指向不同的URL和单独的edittext框，我还假设我必须在主活动中点击监听器添加一些内容来调用新的类。

从服务器检索.txt

0 个答案: