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我正在使用 JSON 访问我的 mySQL 数据库，然后返回产品信息，例如 UPCA、产品和公司。我能够让信息以灰色文本显示，但不会出现在文本视图中。我怎样才能让它出现在文本视图中。我已经查看了其他问题，但我找不到能特别帮助我的问题。有关如何执行此操作的任何信息都会很棒。也许我错过了什么？先感谢您

这是我的主文件包

net.example.glutefree;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.widget.Button;
import android.widget.EditText;
//import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;

//Links GLUTEFREE with NEWACTIVITY
public class GluteFree extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.glute_free);
        mMyEditText = (EditText) findViewById(R.id.editText1);
        Button pressToScan = (Button) findViewById(R.id.button1);

        pressToScan.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent data = new Intent("com.google.zxing.client.android.SCAN");
                data.putExtra("com.google.zxing.client.android.SCAN.SCAN_MODE",
                        "QR_CODE_MODE");
                setResult(RESULT_OK, data);
                startActivityForResult(data, 0);
            }
        });
    }



    public void onActivityResult(int requestCode, int resultCode, Intent data) {
         String UPC = null;
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 0) {
            if (resultCode == RESULT_OK) {
                UPC = data.getStringExtra("SCAN_RESULT");
                // moved here
                Intent i = new Intent("net.example.glutefree.Networking");
                i.putExtra("UPCA", UPC);
                startActivity(i);
                EditText tv = (EditText) findViewById(R.id.editText1);
                tv.setText(UPC);
                // Handle successful scan
            } else if (resultCode == RESULT_CANCELED) {
                // Handle cancel
            }

        }

    }

    // Click this Link to open Links Page
    public void onClickLinks(View view) {
        ;
    }
    //Click this Link to open the Previous Result
    public void onClickResult(View view) {
        startActivity(new Intent("net.example.glutefree.Networking"));
    }
    //Manually Search the UPC that is in the box
    //FIND CODE TO MAKE THAT WORK
    private EditText mMyEditText;
    public void onClickSearch(View view) { 

        String UPC = mMyEditText.getText().toString();
        Intent intent = new Intent(this, Networking.class);   
        intent.putExtra("UPCA", UPC);  //text is some key used to retrieve value in NextActivity 
        startActivity(intent);
    }
}

这是我的数据库连接文件。

package net.example.glutefree;

import android.app.Activity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
import android.widget.TextView;





public class Networking extends Activity{
    TextView txt;
    int request_Code = 1;
//called when activity is first created
    @Override
    protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_networking);
    txt = new TextView(getApplicationContext());
    // Set the text and call the connect function. 
    txt.setText("Connecting...");
  //call the method to run the data retrieval
    new Thread() {
        public void run() {
            final String data = getServerData(KEY_121);
            if (data != null)
                runOnUiThread(new Runnable()
                {
                    public void run()
                    {
                       txt.setText(data);

                    }
                });
        }
    }.start();
}



public static final String KEY_121 = "http://website.com/scripts/application_query.php";

private String getServerData(String returnString) {
   String UPC = getIntent().getStringExtra("UPCA");
   InputStream is = null;
   String result = "";
    //the upc data to send
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

    nameValuePairs.add(new BasicNameValuePair("UPCA",UPC));

    //http post
    try{

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(KEY_121);
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();

    }catch(Exception e){
            Log.e("log_tag", "Error in http connection "+e.toString());
    }

    //convert response to string
    try{
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
            }
            is.close();
            result=sb.toString();
    }catch(Exception e){
            Log.e("log_tag", "Error converting result "+e.toString());
    }
    //parse json data
    try{
            JSONArray jArray = new JSONArray(result);
            Log.e("log_tag", "Result ");
            for(int i=0;i<jArray.length();i++){
                    JSONObject json_data = jArray.getJSONObject(i);
                    String UPCA = json_data.getString("UPCA");
                    String Product = json_data.getString("Product");
                    String Glute = json_data.getString("Gluten Free");
                    returnString += "\n\t" + jArray.getJSONObject(i);
            }
    }catch(JSONException e){
            Log.e("log_tag", "Error parsing data "+e.toString());
    }
    return returnString;
}

}
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