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我想連接到我的服務器上的數據庫。我剛剛開始與AsyncTask合作，因爲它向我推薦。在此之前，我在主UI線程上有HTTP請求，這當然意味着它不起作用。現在工作好一點，但我仍然有問題。如果我的服務器關閉，我會關閉一個部隊。如果你看看我的代碼，我會包含一個敬酒，告訴我是否無法建立連接。但是這並沒有顯示。HTTP POST到MySQL數據庫AyncTask錯誤。強制關閉。幫助讚賞
有什麼我需要改變，爲了讓它停止強制關閉，只顯示吐司？
當我有我的服務器和數據庫是我看着logcat和我的android應用程序確實檢索數據，但它在logcat中，並沒有在頁面上顯示。其中一些代碼來自教程和搜索谷歌，所以我知道「// PARSING DATA」位僅計算此刻數據的長度，而沒有其他值。我認爲那是我需要添加代碼才能顯示的地方。只是去展示這對我來說是多麼新鮮。
我真的很感激任何幫助！真是越來越受這一切這是絕對沒有幫助:(受挫
這裏是我的代碼：！
package com.android.history;
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.ParseException;
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.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class CurrentSeasonDrivers extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.currentseason_drivers);
new HttpTask().execute();
}
private static class HttpTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... params) {
doStuff();
return null;
}
public static void doStuff() {
JSONArray jArray;
String result = null;
InputStream is = null;
StringBuilder sb = null;
HttpResponse response;
HttpEntity entity;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
// HTTP POST REQUEST
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://192.168.0.13/testdatabase.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httppost);
entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection" + e.toString());
Toast.makeText(null, "Could not connect to server", Toast.LENGTH_LONG).show();
}
// CONVERT RESPONSE TO STRING
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
is.close();
result = sb.toString();
Log.i("json string", result);
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// PARSING DATA
String drivername;
String drivesfor;
try {
jArray = new JSONArray(result);
JSONObject json_data = null;
System.out.println("Length " + jArray.length());
Log.d("DB", "Length " + jArray.length());
for (int i = 0; i < jArray.length(); i++) {
System.out.println("counter " + i);
json_data = jArray.getJSONObject(i);
drivername = json_data.getString("Driver_full_name");
drivesfor = json_data.getString("Drives_for");
System.out.println("Drives_for" + drivesfor);
}
} catch (JSONException e1) {
Log.d("DB", "Error somewhere");
} catch (ParseException e1) {
e1.printStackTrace();
}
}
}
}
再次感謝
下面是我log_cat錯誤：
08-22 12:26:39.405: E/log_tag(14327): Error in http connectionorg.apache.http.conn.HttpHostConnectException: Connection to http://192.168.0.13 refused
08-22 12:26:39.405: W/dalvikvm(14327): threadid=13: thread exiting with uncaught exception (group=0x40a051f8)
08-22 12:26:39.455: E/AndroidRuntime(14327): FATAL EXCEPTION: AsyncTask #2
08-22 12:26:39.455: E/AndroidRuntime(14327): java.lang.RuntimeException: An error occured while executing doInBackground()
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.lang.Thread.run(Thread.java:856)
08-22 12:26:39.455: E/AndroidRuntime(14327): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.os.Handler.<init>(Handler.java:121)
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.widget.Toast$TN.<init>(Toast.java:317)
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.widget.Toast.<init>(Toast.java:91)
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.widget.Toast.makeText(Toast.java:233)
08-22 12:26:39.455: E/AndroidRuntime(14327): at com.android.history.CurrentSeasonDrivers$HttpTask.doStuff(CurrentSeasonDrivers.java:74)
08-22 12:26:39.455: E/AndroidRuntime(14327): at com.android.history.CurrentSeasonDrivers$HttpTask.doInBackground(CurrentSeasonDrivers.java:44)
08-22 12:26:39.455: E/AndroidRuntime(14327): at com.android.history.CurrentSeasonDrivers$HttpTask.doInBackground(CurrentSeasonDrivers.java:1)
08-22 12:26:39.455: E/AndroidRuntime(14327): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-22 12:26:39.455: E/AndroidRuntime(14327): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-22 12:26:39.455: E/AndroidRuntime(14327): ... 5 more
當你說你的代碼強制關閉，不要忘了張貼堆棧跟蹤，讓我們知道它崩潰什麼線（以及該行上的代碼）。 – Reinier
從logcat發佈錯誤。 –