php - 安卓+php mysql

Question

我正在创建一个可以访问外部数据库以检索一些数据的移动应用程序，但问题出在 logcat 中，我遇到了错误，任何人都可以帮助我，我将不胜感激

测试外部数据库 Activity .java

package com.taseen.apps;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.DefaultClientConnection;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.R.array;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class TestExternalDatabaseActivity extends Activity {

    TextView resultView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testexternaldatabase);

    resultView =(TextView)findViewById(R.id.result);
    getData();



    }


   public void getData() 
   {
       String  result = "";
       InputStream isr = null;

       try {
        HttpClient httpclient = new DefaultHttpClient();
           HttpPost httppost = new  HttpPost("127.0.0.2/getAllCustomers.php");
           HttpResponse response  = httpclient.execute(httppost);
           HttpEntity entity = response.getEntity();
           try {
            isr = entity.getContent();
        } catch (IllegalStateException e4) {
            // TODO Auto-generated catch block
            e4.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        Log.e("log-tag", "Error in  connection"+e.toString());
        resultView.setText("could not connect to database");


        //convert response to string 

        try {
            BufferedReader reader = new  BufferedReader(new InputStreamReader(isr, "iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while((line = reader.readLine())!= null)
            {
                sb.append(line + "\n");

            }
            isr.close();

            result = sb.toString();
        } catch (UnsupportedEncodingException e1) {
            // TODO Auto-generated catch block
            Log.e("Log-tag", "Error converting  result" +e.toString());




    //parse json data

            try {
                String s ="";
                JSONArray jArray = new JSONArray(result);

                for(int i = 0; i<jArray.length(); i++)
                {
                    JSONObject json = jArray.getJSONObject(i);
                    s =  s +
                            "Name: "+json.getString("FirstName")+" "+json.getString("LastName")+"\n"+
                            "Age: "+json.getString("Age")+"\n"+
                            "Mobile Used: "+json.getString("Mobile")+"\n\n";

                }

                resultView.setText(s);
            } catch (JSONException e2) {
                // TODO Auto-generated catch block
                Log.e("log-tag", "Error parsing data"+e.toString());
            }


    } catch (IOException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }





   } catch (IOException e5) {
        // TODO Auto-generated catch block
        e5.printStackTrace();
    }

  }
}

日志:

04-02 19:12:24.933: D/AndroidRuntime(331): Shutting down VM
04-02 19:12:24.933: W/dalvikvm(331): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-02 19:12:24.952: E/AndroidRuntime(331): FATAL EXCEPTION: main
04-02 19:12:24.952: E/AndroidRuntime(331): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.taseen.apps/com.taseen.apps.TestExternalDatabaseActivity}: java.lang.IllegalStateException: Target host must not be null, or set in parameters.
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.os.Looper.loop(Looper.java:123)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread.main(ActivityThread.java:3683)
04-02 19:12:24.952: E/AndroidRuntime(331):  at java.lang.reflect.Method.invokeNative(Native Method)
04-02 19:12:24.952: E/AndroidRuntime(331):  at java.lang.reflect.Method.invoke(Method.java:507)
04-02 19:12:24.952: E/AndroidRuntime(331):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-02 19:12:24.952: E/AndroidRuntime(331):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-02 19:12:24.952: E/AndroidRuntime(331):  at dalvik.system.NativeStart.main(Native Method)
04-02 19:12:24.952: E/AndroidRuntime(331): Caused by: java.lang.IllegalStateException: Target host must not be null, or set in parameters.
04-02 19:12:24.952: E/AndroidRuntime(331):  at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:572)
04-02 19:12:24.952: E/AndroidRuntime(331):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:292)
04-02 19:12:24.952: E/AndroidRuntime(331):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-02 19:12:24.952: E/AndroidRuntime(331):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-02 19:12:24.952: E/AndroidRuntime(331):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-02 19:12:24.952: E/AndroidRuntime(331):  at com.taseen.apps.TestExternalDatabaseActivity.getData(TestExternalDatabaseActivity.java:51)
04-02 19:12:24.952: E/AndroidRuntime(331):  at com.taseen.apps.TestExternalDatabaseActivity.onCreate(TestExternalDatabaseActivity.java:36)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-02 19:12:24.952: E/AndroidRuntime(331):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
04-02 19:12:24.952: E/AndroidRuntime(331):  ... 11 more

getAllCustomers.php

<?php

$con = mysql_connect("localhost", "root", "root")or die(mysql_error());

mysql_select_db("TestDatabase", $con) or die("can not connect to the database");
$result = mysql_query("SELECT * FROM customer")or die(mysql_error());

while($row = mysql_fetch_assoc($result))
{
    $output[] = $row;
}
  print(json_encode($output));

  mysql_close();

?>

Answer 1

我认为你的问题是你忘记了 http:// 前缀试试这个代码:

HttpPost httppost = new  HttpPost("http://192.168.0.1/getAllCustomers.php");

请注意，您还需要设置本地主机的实际服务器 ip。