請幫我在我的AsyncTask類

這裏是我的java文件。似乎找不到如何執行後請求方法的答案請教我如何使這項工作。謝謝。我需要在使用onClickListener時在cgi腳本上發佈請求。請幫我在我的AsyncTask類

package com.example.miraapp; 


    import java.io.IOException; 
    import java.net.URI; 

    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 android.app.Activity; 
    import android.os.AsyncTask; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.view.View.OnClickListener; 
    import android.widget.ImageButton; 
    import android.widget.Toast; 

    public class GUI extends Activity implements OnClickListener{ 

    ImageButton IB1; 
    ImageButton IB2; 
    ImageButton IB3; 
    ImageButton IB4; 
    public URI[] urls; 

    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_gui); 

     IB1 = (ImageButton) findViewById(R.id.imageButton1); 
     IB1.setOnClickListener(this); 

     IB2 = (ImageButton) findViewById(R.id.imageButton2); 
     IB2.setOnClickListener(this); 

     IB3 = (ImageButton) findViewById(R.id.imageButton3); 
     IB3.setOnClickListener(this); 

     IB4 = (ImageButton) findViewById(R.id.imageButton4); 
     IB4.setOnClickListener(this); 


    } 
    class RequestTask extends AsyncTask<String, String, String>{ 

     @Override 
     protected String doInBackground(String... params) { 


      postData(); 
      return null; 
     } 


      public void postData() { 
       // Create a new HttpClient and Post Header 
       HttpClient httpclient = new DefaultHttpClient(); 
       HttpPost httppost = new HttpPost("10.0.0.1/cgi-bin/ForwardPress.cgi"); 

       try { 

       // Execute HTTP Post Request 
       HttpResponse response = httpclient.execute(httppost); 

       } catch (ClientProtocolException e) { 
       // TODO Auto-generated catch block 
       } catch (IOException e) { 
       // TODO Auto-generated catch block 
       } 

       public void ibutton4Click() 
       { 
        try { 

         // Execute HTTP Post Request 
         HttpResponse response = httpclient.execute(httppost); 

         } catch (ClientProtocolException e) { 
         // TODO Auto-generated catch block 
         } catch (IOException e) { 
         // TODO Auto-generated catch block 
         } 
        Toast.makeText(this, "Forward!", Toast.LENGTH_SHORT).show(); 
       } 
       public void ibuttonRelease() 
       { 
        new RequestTask().execute("10.0.0.1/cgi-bin/ButtonRelease.cgi"); 
       } 
       public void ibutton2Click() 
       { 
        new RequestTask().execute("10.0.0.1/cgi-bin/BackwardPress.cgi"); 
        Toast.makeText(this, "Backward!", Toast.LENGTH_SHORT).show(); 
       } 
       public void ibutton3Click() 
       { 
        new RequestTask().execute("10.0.0.1/cgi-bin/RightPress.cgi"); 
        Toast.makeText(this, "Turn Right!", Toast.LENGTH_SHORT).show(); 
       } 
       public void ibutton1Click() 
       { 
        new RequestTask().execute("10.0.0.1/cgi-bin/LeftPress.cgi"); 
        Toast.makeText(this, "Turn Left!", Toast.LENGTH_SHORT).show(); 
       } 

    } 
    } 





    public void onClick(View v) 
    { 

     switch (v.getId()) 
     { 
      case R.id.imageButton1: 

       ibutton1Click(); 
       break; 

      case R.id.imageButton2: 

       ibutton2Click(); 
       break; 

      case R.id.imageButton3: 

       ibutton3Click(); 
       break; 

      case R.id.imageButton4: 

       ibutton4Click(); 
       break; 


     } 
    } 
};

這裏是我的錯誤

Description Resource Path Location Type 
Syntax error, insert "enum Identifier" to complete EnumHeaderName GUI.java /MiRaApp/src/com/example/miraapp line 75 Java Problem 
Syntax error on token "void", @ expected GUI.java /MiRaApp/src/com/example/miraapp line 75 Java Problem 
Syntax error on token "void", @ expected GUI.java /MiRaApp/src/com/example/miraapp line 89 Java Problem 
Syntax error, insert "EnumBody" to complete BlockStatement GUI.java /MiRaApp/src/com/example/miraapp line 75 Java Problem 
Syntax error, insert "EnumBody" to complete BlockStatement GUI.java /MiRaApp/src/com/example/miraapp line 89 Java Problem 
Syntax error, insert "enum Identifier" to complete EnumHeaderName GUI.java /MiRaApp/src/com/example/miraapp line 89 Java Problem 
Syntax error, insert "enum Identifier" to complete EnumHeaderName GUI.java /MiRaApp/src/com/example/miraapp line 93 Java Problem 
Syntax error on token "void", @ expected GUI.java /MiRaApp/src/com/example/miraapp line 93 Java Problem 
Syntax error on token "void", @ expected GUI.java /MiRaApp/src/com/example/miraapp line 98 Java Problem 
Syntax error, insert "EnumBody" to complete BlockStatement GUI.java /MiRaApp/src/com/example/miraapp line 93 Java Problem 
Syntax error, insert "EnumBody" to complete BlockStatement GUI.java /MiRaApp/src/com/example/miraapp line 98 Java Problem 
Syntax error, insert "enum Identifier" to complete EnumHeaderName GUI.java /MiRaApp/src/com/example/miraapp line 98 Java Problem 
Syntax error on token "void", @ expected GUI.java /MiRaApp/src/com/example/miraapp line 103 Java Problem 
Syntax error, insert "enum Identifier" to complete EnumHeaderName GUI.java /MiRaApp/src/com/example/miraapp line 103 Java Problem 
Syntax error, insert "EnumBody" to complete BlockStatement GUI.java /MiRaApp/src/com/example/miraapp line 103 Java Problem 
The method ibutton1Click() is undefined for the type GUI GUI.java /MiRaApp/src/com/example/miraapp line 123 Java Problem 
The method ibutton2Click() is undefined for the type GUI GUI.java /MiRaApp/src/com/example/miraapp line 128 Java Problem 
The method ibutton3Click() is undefined for the type GUI GUI.java /MiRaApp/src/com/example/miraapp line 133 Java Problem 
The method ibutton4Click() is undefined for the type GUI GUI.java /MiRaApp/src/com/example/miraapp line 138 Java Problem

來源

2014-04-13 shikurin03

爲什麼你不把postData函數的內容直接放在doInBackGround裏面？ –

您正在Asyncktask中添加.execute調用？!! –

爲什麼？怎麼了？ – shikurin03

也許更多的東西是這樣的：

package com.example.miraapp; 


import java.io.IOException; 
import java.net.URI; 

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 android.app.Activity; 
import android.app.DownloadManager; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ImageButton; 
import android.widget.Toast; 

public class GUI extends Activity implements OnClickListener{ 

    ImageButton IB1; 
    ImageButton IB2; 
    ImageButton IB3; 
    ImageButton IB4; 
    public URI[] urls; 

    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_gui); 

     IB1 = (ImageButton) findViewById(R.id.imageButton1); 
     IB1.setOnClickListener(this); 

     IB2 = (ImageButton) findViewById(R.id.imageButton2); 
     IB2.setOnClickListener(this); 

     IB3 = (ImageButton) findViewById(R.id.imageButton3); 
     IB3.setOnClickListener(this); 

     IB4 = (ImageButton) findViewById(R.id.imageButton4); 
     IB4.setOnClickListener(this); 


    } 
    class RequestTask extends AsyncTask<String, Void, Void>{ 

     Exception error; 
     @Override 
     protected Void doInBackground(String... params) { 


      String url = params[0]; 
      // Create a new HttpClient and Post Header 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost(url); 

      try { 

       // Execute HTTP Post Request 
       httpclient.execute(httppost); 

      } catch (ClientProtocolException e) { 
       error = e; 
      } catch (IOException e) { 
       error = e; 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result){ 
      if(error != null){ 
       // TODO handle the exception here, for example: 
       Toast.makeText(GUI.this, "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show(); 
      } 
     } 
    } 
    public void ibutton4Click() 
    { 
     new RequestTask().execute("10.0.0.1/cgi-bin/ForwardPress.cgi"); 
     Toast.makeText(GUI.this, "Forward!", Toast.LENGTH_SHORT).show(); 
    } 
    public void ibuttonRelease() 
    { 
     new RequestTask().execute("10.0.0.1/cgi-bin/ButtonRelease.cgi"); 
    } 
    public void ibutton2Click() 
    { 
     new RequestTask().execute("10.0.0.1/cgi-bin/BackwardPress.cgi"); 
     Toast.makeText(GUI.this, "Backward!", Toast.LENGTH_SHORT).show(); 
    } 
    public void ibutton3Click() 
    { 
     new RequestTask().execute("10.0.0.1/cgi-bin/RightPress.cgi"); 
     Toast.makeText(GUI.this, "Turn Right!", Toast.LENGTH_SHORT).show(); 
    } 
    public void ibutton1Click() 
    { 
     new RequestTask().execute("10.0.0.1/cgi-bin/LeftPress.cgi"); 
     Toast.makeText(GUI.this, "Turn Left!", Toast.LENGTH_SHORT).show(); 
    } 



    public void onClick(View v) 
    { 

     switch (v.getId()) 
     { 
      case R.id.imageButton1: 

       ibutton1Click(); 
       break; 

      case R.id.imageButton2: 

       ibutton2Click(); 
       break; 

      case R.id.imageButton3: 

       ibutton3Click(); 
       break; 

      case R.id.imageButton4: 

       ibutton4Click(); 
       break; 


     } 
    } 
}

我希望你能花時間來了解我做了什麼，以及爲什麼。此外，您的錯誤消息表明您有很多語法錯誤。最好在你去的時候修復這些問題，所以你沒有留下200行代碼，你不明白什麼是錯的或錯誤在哪裏。

來源

2014-04-13 16:39:02 nasch

感謝您接受我的回答，現在我有評論權限！ – nasch

請幫我在我的AsyncTask類

回答

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