android 응답 onprogress 메서드에서 충돌이 발생합니다.

Question

응답이 공식화되고 있지만 응용 프로그램이 충돌하는 동안 화면에 진행률 표시를 얻으려고 시도하고 있습니다. 안드로이드에서 새로운데, 전에는 단계별로 진행 했으므로 나는 그것이 작동하는 onprogress 메소드를 구현했다. 서버로부터 응답을 먼저 받았기 때문에 디스플레이를 업데이트했기 때문에 가정한다. 그러나 실행할 때 서버에서 애플리케이션의 응답을 보지 못한다. 어떤 도움이라도 대단히 감사하겠습니다. 추락

로그 캣 출력 :

12-20 13:01:30.636: D/dalvikvm(597): GC_CONCURRENT freed 189K, 4% free 10154K/10503K, paused 19ms+21ms 
12-20 13:01:31.806: D/dalvikvm(597): GC_CONCURRENT freed 391K, 6% free 10278K/10823K, paused 27ms+20ms 
12-20 13:01:31.876: D/dalvikvm(597): GC_FOR_ALLOC freed 370K, 6% free 10235K/10887K, paused 39ms 
12-20 13:01:31.926: D/dalvikvm(597): GC_FOR_ALLOC freed 351K, 6% free 10242K/10887K, paused 41ms 
12-20 13:01:31.976: D/dalvikvm(597): GC_FOR_ALLOC freed 319K, 6% free 10245K/10887K, paused 40ms 
12-20 13:01:32.036: D/dalvikvm(597): GC_FOR_ALLOC freed 322K, 6% free 10243K/10887K, paused 45ms 
12-20 13:01:32.156: D/AndroidRuntime(597): Shutting down VM 
12-20 13:01:32.156: W/dalvikvm(597): threadid=1: thread exiting with uncaught exception (group=0x409951f8) 
12-20 13:01:32.176: E/AndroidRuntime(597): FATAL EXCEPTION: main 
12-20 13:01:32.176: E/AndroidRuntime(597): java.lang.NullPointerException 
12-20 13:01:32.176: E/AndroidRuntime(597): at android.app.Activity.findViewById(Activity.java:1794) 
12-20 13:01:32.176: E/AndroidRuntime(597): at edu.byu.hummedia.ReadWebpageAsyncTask$DownloadWebPageTask.onProgressUpdate(ReadWebpageAsyncTask.java:147) 
12-20 13:01:32.176: E/AndroidRuntime(597): at edu.byu.hummedia.ReadWebpageAsyncTask$DownloadWebPageTask.onProgressUpdate(ReadWebpageAsyncTask.java:1) 
12-20 13:01:32.176: E/AndroidRuntime(597): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:618) 
12-20 13:01:32.176: E/AndroidRuntime(597): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-20 13:01:32.176: E/AndroidRuntime(597): at android.os.Looper.loop(Looper.java:137) 
12-20 13:01:32.176: E/AndroidRuntime(597): at android.app.ActivityThread.main(ActivityThread.java:4340) 
12-20 13:01:32.176: E/AndroidRuntime(597): at java.lang.reflect.Method.invokeNative(Native Method) 
12-20 13:01:32.176: E/AndroidRuntime(597): at java.lang.reflect.Method.invoke(Method.java:511) 
12-20 13:01:32.176: E/AndroidRuntime(597): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
12-20 13:01:32.176: E/AndroidRuntime(597): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
12-20 13:01:32.176: E/AndroidRuntime(597): at dalvik.system.NativeStart.main(Native Method) 
12-20 13:06:01.806: I/Process(597): Sending signal. PID: 597 SIG: 9 

hummedia 클래스 :

package edu.byu.hummedia; 

import android.app.ActionBar; 

import android.app.ActionBar.Tab; 
import android.app.Activity; 
import android.app.FragmentTransaction; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.Toast; 

public class Hummedia extends Activity implements ActionBar.TabListener { 
    /** Called when the activity is first created. */ 
    ListView myListView = null; 
    public ArrayAdapter<String> adapter; 
    Button basicSubmitButton; 
    Button advancedSubmitButton; 
    EditText myBasicEditText; 
    EditText myAdvancedEditText; 
    EditText title; 
    EditText language; 
    EditText category; 
    EditText keyword; 
    ActionBar bar; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 


     bar = getActionBar(); 
     bar.addTab(bar.newTab().setText("Basic\nSearch").setTabListener(this)); 
     bar.addTab(bar.newTab().setText("Advanced\nSearch").setTabListener(this)); 
     bar.addTab(bar.newTab().setText("Results").setTabListener(this)); 
     //bar.addTab(bar.newTab().setText("Exit").setTabListener(this)); 

     bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_USE_LOGO); 
     bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 
     bar.setDisplayShowHomeEnabled(true); 
     // remove the activity title to make space for tabs 
     bar.setDisplayShowTitleEnabled(false); 
     bar.setDisplayUseLogoEnabled(false); 
    } 

    public void onTabReselected(Tab tab, FragmentTransaction ft) { 
     // TODO Auto-generated method stub 
     if (tab.getText().equals("Basic\nSearch")) 
     { 
      Toast.makeText(this, "Searching for: " + "basic" + "...", Toast.LENGTH_SHORT).show(); 
     } 
     if (tab.getText().equals("Advanced\nSearch")) 
     { 
      Toast.makeText(this, "Searching for: " + "Advanced" + "...", Toast.LENGTH_SHORT).show(); 
     } 
     if (tab.getText().equals("Results")) 
     { 
      Toast.makeText(this, "Searching for: " + "Results" + "...", Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public void onTabSelected(Tab tab, FragmentTransaction ft) { 
     // TODO Auto-generated method stub 
     if (tab.getText().equals("Basic\nSearch")) 
     { 
      setContentView(R.layout.basic); 
      basicSubmitButton = (Button)findViewById(R.id.myBasicSubmitbutton); 
      myBasicEditText = (EditText)findViewById(R.id.myBasicEditText); 
     } 
     if (tab.getText().equals("Advanced\nSearch")) 
     { 
      setContentView(R.layout.advanced); 
      advancedSubmitButton = (Button)findViewById(R.id.myAdvancedSubmitbutton); 
      title = (EditText)findViewById(R.id.title); 
      language = (EditText)findViewById(R.id.language); 
      category = (EditText)findViewById(R.id.category); 
      keyword = (EditText)findViewById(R.id.keyword); 
      //Toast.makeText(this, "Searching for: " + "Advanced" + "...", Toast.LENGTH_SHORT).show(); 

     } 
     if (tab.getText().equals("Results")) 
     { 
      setContentView(R.layout.results); 

      //Toast.makeText(this, "Searching for: " + "Results" + "...", Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public void basicSubmitButton(View view) { 
     String query = myBasicEditText.getText().toString(); 
     bar.setSelectedNavigationItem(2); 
     ReadWebpageAsyncTask basicSubmission = new ReadWebpageAsyncTask(); 
     basicSubmission.query(query); 
     myListView = (ListView) findViewById (R.id.lv); 
     myListView.setTextFilterEnabled(true); 
     myListView.clearChoices(); 


     adapter = new ArrayAdapter<String>(Hummedia.this, 
       android.R.layout.simple_list_item_1, 
       basicSubmission.mediaList); 
     myListView.setAdapter(adapter); 
     adapter.notifyDataSetChanged(); 

    } 


    public void advancedSubmitButton(View view) { 
     String mytitle = title.getText().toString(); 
     String mylanguage = language.getText().toString(); 
     String mycategory = category.getText().toString(); 
     String mykeyword = keyword.getText().toString(); 
     String query=""; 
     if (mytitle.isEmpty() != true) 
     { 
      query+="title="+mytitle; 
     } 
     if (mylanguage.isEmpty() != true) 
     { 
      query+="language="+mylanguage; 
     } 
     if (mycategory.isEmpty() != true) 
     { 
      query+="subject="+mycategory; 
     } 
     if (mykeyword.isEmpty() != true) 
     { 
      query+="keyword="+mykeyword; 
     } 
     //Toast.makeText(this, "I was called...", Toast.LENGTH_SHORT).show(); 
     bar.setSelectedNavigationItem(2); 
     ReadWebpageAsyncTask advancedSubmission = new ReadWebpageAsyncTask(); 
     advancedSubmission.advquery(query); 
     //bar.setSelectedNavigationItem(2); 
     myListView = (ListView) findViewById (R.id.lv); 
     myListView.setTextFilterEnabled(true); 
     myListView.clearChoices(); 


     adapter = new ArrayAdapter<String>(Hummedia.this, 
       android.R.layout.simple_list_item_1, 
       advancedSubmission.mediaList); 
     myListView.setAdapter(adapter); 
     adapter.notifyDataSetChanged(); 

    } 


    public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
     // TODO Auto-generated method stub 

    } 
} 

비동기 작업 클래스 : 말하고

package edu.byu.hummedia; 

import java.io.BufferedReader; 

import android.widget.Toast; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpResponse; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 
import org.json.JSONArray; 
import android.view.View; 
import android.widget.ProgressBar; 

import android.app.Activity; 
import android.app.ListActivity; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.SystemClock; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.EditText; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.widget.Toast; 
public class ReadWebpageAsyncTask extends ListActivity { 
    ProgressBar progressBar; 
    private TextView textView; 
    public ListView myListView = null; 
    List<String> mediaList = new ArrayList(); 
    public ArrayAdapter<String> adapter; 
    String[] newArray; 
/** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     progressBar = (ProgressBar)findViewById(R.id.progressbar); 
     progressBar.setProgress(0); 
     super.onCreate(savedInstanceState); 
     //setContentView(R.layout.main); 
     String[] values = new String[] { "Android", "iPhone", "WindowsMobile", 
       "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", 
       "Linux", "OS/2" }; 
     newArray = new String[mediaList.size()];mediaList.toArray(newArray); 
     adapter = new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, newArray); 
     setListAdapter(adapter);  
     readWebpage(myListView); 



    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     String item = (String) getListAdapter().getItem(position); 
     Toast.makeText(this, item + " selected", Toast.LENGTH_LONG); 
    } 



    private class DownloadWebPageTask extends AsyncTask<String, Integer, String> { 
     int myProgress; 
     @Override 
     protected String doInBackground(String... urls) { 

      String response = ""; 
      String responseBuilder; 
      String responseString = ""; 
      JSONArray jsonArray; 
      JSONObject jObject = new JSONObject(); 

      for (String url : urls) { 
       DefaultHttpClient client = new DefaultHttpClient(); 
       HttpGet httpGet = new HttpGet(url); 
       try { 
        HttpResponse execute = client.execute(httpGet); 
        InputStream content = execute.getEntity().getContent(); 

        BufferedReader buffer = new BufferedReader(
          new InputStreamReader(content)); 
        String s = ""; 
        while ((s = buffer.readLine()) != null) { 
         response += s; 
        } 

       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
      try { 
       jsonArray = new org.json.JSONArray(response); 
       jObject = jsonArray.toJSONObject(jsonArray); 

       for (int i=0;i<jObject.length();i++) 
       { 
        responseBuilder="\n"; 
        responseBuilder+= "\n title: "+((JSONObject) jsonArray.getJSONObject(i).get("videoinfo")).get("title"); 
        responseBuilder+= "\n subject: "+ ((JSONObject) jsonArray.getJSONObject(i).get("videoinfo")).get("subject"); 
        responseBuilder+= "\n language: "+ ((JSONObject) jsonArray.getJSONObject(i).get("videoinfo")).get("language"); 


        mediaList.add(responseBuilder); 
        responseString += responseBuilder; 
       } 



      } catch (JSONException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 


      while(myProgress<100){ 
       myProgress++; 
       publishProgress(myProgress); 
        SystemClock.sleep(100); 
       } 

      return responseString; 
     } 


     @Override 
      protected void onPreExecute() { 
      // TODO Auto-generated method stub 
      // Toast.makeText(ReadWebpageAsyncTask.this, 
      //  "onPreExecute", Toast.LENGTH_LONG).show(); 
      myProgress = 0; 
      } 


     protected void onProgressUpdate(Integer... values) { 
      // TODO Auto-generated method stub 
      if (progressBar == null) 
       progressBar = (ProgressBar)findViewById(R.id.progressbar); 
      progressBar.setProgress(values[0]); 
      } 

     protected void onPostExecute(Void result) { 
      // TODO Auto-generated method stub 
     // Toast.makeText(ReadWebpageAsyncTask.this, 
     //  "onPostExecute", Toast.LENGTH_LONG).show(); 
      } 
    } 


    public void readWebpage(View view) { 
     DownloadWebPageTask task = new DownloadWebPageTask(); 
     task.execute(new String[] { "http://hummedia.byu.edu/mediainfo/search/?title=Harry" }); 

    } 

    public void query(String query) { 
     DownloadWebPageTask task = new DownloadWebPageTask(); 
     task.execute(new String[] { "http://hummedia.byu.edu/mediainfo/search/?keyword="+query}); 

    } 

    public void advquery(String query) { 
     DownloadWebPageTask task = new DownloadWebPageTask(); 
     task.execute(new String[] { "http://hummedia.byu.edu/mediainfo/search/?"+query}); 

    } 

} 

Answer 1

당신이 게시 로그입니다 코드에서 정확하게 라인 문제가 발생했습니다. 진행률 표시 줄 컨트롤에 대한 참조가 성공하면 제대로 테스트하지 않은 것 같습니다. 코드를 다음으로 변경하십시오.

 protected void onProgressUpdate(Integer... values) 
     { 
     // TODO Auto-generated method stub 
      progressBar = (ProgressBar)findViewById(R.id.progressbar); 
      if (progressBar != null) 
      { 
       progressBar.setProgress(values[0]); 
      } 
      else 
      { 
       // check your resources because something doesn't match 
      } 
     }