使用asynctask Fecting数据的progressdialog

Question

你能帮帮我吗，我的代码在我尝试实现async任务以在我的应用程序中显示进度对话框之前运行，已经一周了，我尝试了几种解决方案但仍然是同样的问题，请有人纠正我的代码，我的代码是：

package coma.exame.dbselect;
import java.io.BufferedReader;
import java.io.IOException;
import html" target="_blank">java.io.InputStream;
import java.io.InputStreamReader;
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.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.app.ProgressDialog;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.TableRow.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {
    InputStream is = null;
      String result = null;
      JSONObject contact = null;

        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
               Button button = (Button) findViewById(R.id.button1);
               button.setOnClickListener(new View.OnClickListener()
                  {
                        public void onClick(View view) 
                    {
                    new task().execute();

                 }
                 });
           }

    class task extends AsyncTask<String, String, String>
           {
           private ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);//private ProgressDialog progressDialog = new ProgressDialog(Login.this);
           protected String doInBackground(String... params) {
                   StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();StrictMode.setThreadPolicy(policy);        
               try{
                       HttpClient httpclient = new DefaultHttpClient();
                       HttpPost httppost = new HttpPost("http://192.168.1.11/sqlserv/test.php");
                       HttpResponse response = httpclient.execute(httppost); 
                       HttpEntity entity = response.getEntity();
                       is = entity.getContent();
               }
               catch(Exception e)
               {
                       Log.e("log_bad_connection", "Error in http connection "+e.toString());
                      Toast.makeText(getApplicationContext(), "Tsy tafa ny connexion", Toast.LENGTH_SHORT).show();
               }
                           try
                       {
                               BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
                               StringBuilder sb = new StringBuilder();
                               String line = null;
                               while ((line = reader.readLine()) != null) 
                               {
                                       sb.append(line + "\n");

                               }
                               is.close();

                               result=sb.toString();
                               return result;
                       }
                       catch(Exception e)
                       {
                              Log.e("log_conversion_resultat", "Error converting result "+e.toString());
                           Toast.makeText(getApplicationContext(), " Input reading fail", Toast.LENGTH_SHORT).show();

                       }


           }

protected void onPreExecute() {
    progressDialog.setMessage("Download data...");
    progressDialog.show();

  }

               protected void onPostExecute(String result) {

                  JSONArray jArray = new JSONArray(result);

                       TableLayout tv=(TableLayout) findViewById(R.id.table);
                       tv.removeAllViewsInLayout();

                   for(int i=-1;i<jArray.length();i++)

                               {
                                       TableRow tr = new TableRow(MainActivity.this);

                                       tr.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

                                      try {

                                           JSONObject json_data = jArray.getJSONObject(i);

                                   TextView b=new TextView(MainActivity.this);
                                      String stime=String.valueOf(json_data.getString("AR_REF"));
                                         b.setText(stime);
                                       b.setTextColor(Color.BLACK);
                                       b.setTextSize(6);
                                       tr.addView(b);
                                       tv.addView(tr);
                               final View vline1 = new View(MainActivity.this);
                             vline1.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 1));
                             vline1.setBackgroundColor(Color.RED);
                             tv.addView(vline1);       

                                       }

                           }
                   this.progressDialog.dismiss(); 
                     }

                      catch(JSONException e)
                       {
                               Log.e("log_tag", "Error parsing data "+e.toString());
                               Toast.makeText(getApplicationContext(), "JsonArray fail", Toast.LENGTH_SHORT).show();
                       }

}

}
}

我的logcat显示错误：

05-31 12:13:09.437:I/编舞（698）：跳过64帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:10.159：我/编舞（698）：跳过了60帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:10.619:D/gralloc_goldfish（698）：检测到没有GPU仿真的模拟器。05-31 12:13:25.900:I/编舞（698）：跳过111帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:26.334:I/编舞（698）：跳过35帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:26.808:I/编舞（698）：跳过50帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:27.214:I/编舞（698）：跳过106帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:27.413:I/编舞（698）：跳过41帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:27.613：我/编舞（698）：跳过了32帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:27.844:I/编舞（698）：跳过58帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:28.113:I/编舞（698）：跳过59帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:28.364:I/编舞（698）：跳过57帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:28.634:I/编舞（698）：跳过55帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:28.894:I/编舞（698）：跳过62帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:29.178:I/编舞（698）：跳过64帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:29.484:I/编舞（698）：跳过75帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:29.754:I/编舞（698）：跳过57帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:30.034:I/编舞（698）：跳过35帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:30.294:I/编舞（698）：跳过53帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:30.573:I/编舞（698）：跳过66帧！应用程序可能在其主线程上做了太多工作。05-31 12:13:30.804:I/编舞（698）：跳过53帧！应用程序可能在其主线程上做了太多工作。05-31 ...

谢谢你

Answer 1

首先，这不是错误。这是Logcat中的一个信息，它警告您正在UI线程中执行的一些密集任务。正如我看到的，您已经为CPU密集型任务使用了Asyncask。您正在使用模拟器，跳过帧在模拟器上将是一个问题。如果跳过太多，您需要查看您在UI线程上执行的CPU密集型任务。在实际设备上测试它，它可能不会显示该警告。

Answer 2

可以遵循这个：

public class ReadWebpageAsyncTask extends Activity {
private TextView textView;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textView = (TextView) findViewById(R.id.TextView01);
}

private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
  String response = "";
  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();
    }
  }
  return response;
}

@Override
protected void onPostExecute(String result) {
  textView.setText(result);
 }
}

public void onClick(View view) {
  DownloadWebPageTask task = new DownloadWebPageTask();
   task.execute(new String[] { "http://www.vogella.com" });

  }
}