我是 Android 应用程序开发的新手。请找到我的 AsyncTask 代码,用于在用户单击按钮时连接 URL。
package in.mosto.geeglobiab2bmobile;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
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.apache.http.util.EntityUtils;
import android.os.AsyncTask;
public class OnbuttonclickHttpPost extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
byte[] result = null;
String str = "";
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://URL_HERE/login.php");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("mobile", params[0]));
nameValuePairs.add(new BasicNameValuePair("password", params[1]));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){
result = EntityUtils.toByteArray(response.getEntity());
str = new String(result, "UTF-8");
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
return str;
}
/**
* on getting result
*/
@Override
protected void onPostExecute(String result) {
// something with data retrieved from server in doInBackground
//Log.v("Response ", result);
MainActivity main = new MainActivity();
if(result.equals("NO_USER_ERROR")){
main.showNewDialog("There is no user existed with the given details.");
}else if(result.equals("FIELDS_ERR")){
main.showNewDialog("Please enter username and password.");
}else{
main.startRecharge(result);
}
}
}
请参阅我的 MainActivity 方法:
OnbuttonclickHttpPost t = new OnbuttonclickHttpPost();
t.execute(mobile.getText().toString(),pass.getText().toString());
public void startRecharge(String param){
Intent inte = new Intent(MainActivity.this.getBaseContext(), StartRecharge.class);
startActivity(inte);
}
public void showNewDialog(String alert){
new AlertDialog.Builder(this)
.setTitle("Please correct following error")
.setMessage(alert)
.setPositiveButton("Okay", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
})
.show();
}
在这里我得到一个错误。我不知道我的代码有什么问题。谁能帮帮我吗 ?