Android im在列表视图中显示数据时出现运行时错误

嗨，我正面临一个问题，我刚刚构建了一个演示应用程序，其中通过AsyncTask在列表视图中调用rest api和json中的sho数据就是我的代码，plz建议我在代码中的位置 包test.rest.api

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*; 

public class showalbooks extends Activity implements OnClickListener {
List<String> list1 = new ArrayList<String>();
String returnString="";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
   // setContentView(R.layout.showalbooks);

}

@Override
public void onClick(View arg0) {

    new LongRunningGetIO().execute();
}

private class LongRunningGetIO extends AsyncTask <Void, Void, String> {

    protected String getASCIIContentFromEntity(HttpEntity entity) throws IllegalStateException, IOException {
       InputStream in = entity.getContent();
         StringBuffer out = new StringBuffer();
         int n = 1;
         while (n>0) {
             byte[] b = new byte[4096];
             n =  in.read(b);
             if (n>0) out.append(new String(b, 0, n));
         }
         return out.toString();
    }

    @Override
    protected String doInBackground(Void... params) {
         HttpClient httpClient = new DefaultHttpClient();
         HttpContext localContext = new BasicHttpContext();
         HttpGet httpGet = new HttpGet("http://192.168.1.156/recess/document/document.json");
         HttpClient client = new DefaultHttpClient();
         HttpResponse response=null;
         try{
          response = client.execute(httpGet);}
         catch(Exception e){}
         System.out.println(response.getStatusLine());
         String text = null;
         try {
                response = httpClient.execute(httpGet, localContext);
               HttpEntity entity = response.getEntity();
               text = getASCIIContentFromEntity(entity);
         } catch (Exception e) {
             return e.getLocalizedMessage();
         }
         String var =text;             
         try{

          JSONObject jObj = new JSONObject(var);
          JSONArray jArray = jObj.getJSONArray("document");
             for(int i=0;i<jArray.length();i++){

                     JSONObject json_data = jArray.getJSONObject(i);
                     Log.i("log_tag","id: "+json_data.getString("id")+
                             ", title: "+json_data.getString("title")
                     );
                     list1.add(json_data.getString("title"));

                     returnString += "\n" +"id:"+ json_data.getString("id")+" "+"Title:"+ json_data.getString("title");

                     }


     }
     catch(JSONException e){
             Log.e("log_tag", "Error parsing data "+e.toString());
     }
         return returnString;

    }   

    //@SuppressWarnings({ "unchecked", "rawtypes" })
    protected void onPostExecute(String results) {
        if (results!=null) {

            setListAdapter(new ArrayAdapter(showalbooks.this, R.layout.showalbooks, list1));

        }

    }
}

public void setListAdapter(ArrayAdapter<String> arrayAdapter) {
    // TODO Auto-generated method stub

}


  }

---

你必须在舱单上写下你的主要类别。 见：

---

showalbooks可能是showalbooks的一个输入错误？我执行此活动仅显示空白页而不是列表请检查代码我认为我在代码中的某个地方错了

05-15 18:27:19.582: E/AndroidRuntime(610): FATAL EXCEPTION: main
05-15 18:27:19.582: E/AndroidRuntime(610): java.lang.RuntimeException: Unable to instantiate   activity    ComponentInfo{com.google.android.gm.contentprovidertest/com.google.android.gm.contentprovidertest.Main}: java.lang.ClassNotFoundException: com.google.android.gm.contentprovidertest.Main
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
 05-15 18:27:19.582: E/AndroidRuntime(610):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.os.Looper.loop(Looper.java:137)
05-15 18:27:19.582: E/AndroidRuntime(610):  at android.app.ActivityThread.main(ActivityThread.java:4424)
05-15 18:27:19.582: E/AndroidRuntime(610):  at java.lang.reflect.Method.invokeNative(Native Method)
05-15 18:27:19.582: E/AndroidRuntime(610):  at java.lang.reflect.Method.invoke(Method.java:511)
05-15 18:27:19.582: E/AndroidRuntime(610):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-15 18:27:19.582: E/AndroidRuntime(610):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
 05-15 18:27:19.582: E/AndroidRuntime(610):     at dalvik.system.NativeStart.main(Native Method)
 05-15 18:27:19.582: E/AndroidRuntime(610): Caused by: java.lang.ClassNotFoundException: com.google.android.gm.contentprovidertest.Main
  05-15 18:27:19.582: E/AndroidRuntime(610):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
  05-15 18:27:19.582: E/AndroidRuntime(610):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
   05-15 18:27:19.582: E/AndroidRuntime(610):   at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
  05-15 18:27:19.582: E/AndroidRuntime(610):    at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
    05-15 18:27:19.582: E/AndroidRuntime(610):  at   android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
   05-15 18:27:19.582: E/AndroidRuntime(610):   ... 11 more