Question

我正在做一个android-php-mysql连接。我试过这个：

HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet();

request.setURI(new URI("http://iamjavadeveloper.com/NoTitle.php"));

HttpResponse response = httpclient.execute(request); 

HttpEntity entity = response.getEntity();

并且php文件是：

$result=mysql_query("select * from titles");

while($row= mysql_fetch_assoc($result)) 
{
        $output[]=$row;
}
echo json_encode($output,JSON_UNESCAPED_UNICODE);

但这不起作用;

php：

$result=mysql_query("select * from titles where id='$id' " );

while($row= mysql_fetch_assoc($result)) 
{
        $output[]=$row;
}
echo json_encode($output,JSON_UNESCAPED_UNICODE);

和java：

HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet();

request.setURI(new URI("http://iamjavadeveloper.com/NoTitle.php?id=23"));

HttpResponse response = httpclient.execute(request);

和Logcat：

03-20 00:50:41.939: E/AndroidRuntime(2758): FATAL EXCEPTION: AsyncTask #1
03-20 00:50:41.939: E/AndroidRuntime(2758): Process: com.example.onur, PID: 2758
03-20 00:50:41.939: E/AndroidRuntime(2758): java.lang.RuntimeException: An error occured while executing doInBackground()
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.lang.Thread.run(Thread.java:818)
03-20 00:50:41.939: E/AndroidRuntime(2758): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.os.Handler.<init>(Handler.java:200)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.os.Handler.<init>(Handler.java:114)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.widget.Toast$TN.<init>(Toast.java:336)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.widget.Toast.<init>(Toast.java:100)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.widget.Toast.makeText(Toast.java:250)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at com.example.onur.MainActivity$MarkOnMap.doInBackground(MainActivity.java:415)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at com.example.onur.MainActivity$MarkOnMap.doInBackground(MainActivity.java:1)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-20 00:50:41.939: E/AndroidRuntime(2758):         at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-20 00:50:41.939: E/AndroidRuntime(2758):         ... 4 more

Answer 1

请发布详细代码。根据stacktrace，看起来你正试图从doInBackground（）访问UI线程。

确保您没有访问任何UI代码，即doInBackGround（）方法中的Toast。

Answer 2

试试这个

<强> MainActivity.class

 new ParserClass(new CalbackListener() {

        @Override
        public void onSuccess(String result) {
            Toast.makeText(getApplicationContext(), result,
                    Toast.LENGTH_LONG).show();
        }
    }).execute();

您的Parser类

package com.example.soapsample;
import java.io.IOException;
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.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.os.AsyncTask;
import android.util.Log;

public class ParserClass extends AsyncTask<Void, Void, String> {

public interface CalbackListener {
    public void onSuccess(String result);
}

private CalbackListener callback;
private String url = "http://iamjavadeveloper.com/NoTitle.php?id=23";

public ParserClass(CalbackListener callback1) {
    this.callback = callback1;
}

@Override
protected String doInBackground(Void... params) {
    String result = null;
    try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        Log.i("url", url);
        HttpResponse httpResponse = null;
        if (httpGet != null) {
            httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            result = EntityUtils.toString(httpEntity);
            Log.i("Result", result);
        }
        return result;
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        return null;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
    callback.onSuccess(result);
}
}

它将返回一些值，确保您的网址并返回值。

Android无法向此php发送“id”

2 个答案:

试试这个