Question

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

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.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import sereen.sql.Info;
import sereen.sql.InfoServicesNew;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class PenddingOrders extends Activity {
ArrayList<Info> info=new ArrayList<Info>(); 

    int imgPendding=R.drawable.ex2;
    ListView list;
    ProgressDialog pd;
    ArrayAdapter<String> adapter;
    private String defValue = "N/A";

    InfoServicesNew databaseHelper;
     String name=InfoServicesNew.DB_TABLE_NAME;
    static int img[]={R.drawable.ex2,R.drawable.ex2,R.drawable.ex2,R.drawable.ex2,
        R.drawable.ex2,R.drawable.ex2,R.drawable.ex2,R.drawable.ex2, R.drawable.ex2,
        R.drawable.ex2};
    String data;
    Intent o;
    int position;
    Object object;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pendding_orders);

        databaseHelper = new InfoServicesNew(this);



        list=(ListView)findViewById(R.id.listView1);
        pd = new ProgressDialog(this);

        new asy().execute("http://jsonblob.com/api/jsonBlob/53021f22e4b0f9ce1677329a");






    } 


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.pendding_orders, menu);
        return true;
    }
    public class asy extends AsyncTask<String, String, ArrayList<Info>>
    {



        @Override
        protected ArrayList<Info> doInBackground(String... params) {
            // TODO Auto-generated method stub

             //activity is defined as a global variable in your AsyncTask

            try {

                HttpClient hc = new DefaultHttpClient();
                HttpGet hg = new HttpGet(params[0]);
                HttpResponse hr = hc.execute(hg);
                HttpEntity he = hr.getEntity();
                data = EntityUtils.toString(he);
                Log.i("data", data);

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

            ArrayList<Info> sereenlist = new ArrayList<Info>();
            sereenlist = getJSONData(data);

            return sereenlist;



        }


        private ArrayList<Info> getJSONData(String data) {
            // TODO Auto-generated method stub



            ArrayList<Info> rs = null;


                try {

                JSONObject obj = new JSONObject(data);
                JSONArray finalObj = obj.optJSONArray("orders");

                for (int i = 0; i < finalObj.length(); i++) 
                {

                    final String orderNumber = finalObj.optJSONObject(i).optString(
                            "order-number");
                    final String orderAmount = finalObj.optJSONObject(i).optString(
                            "order-amount");
                    final String date = finalObj.optJSONObject(i).optString(
                            "date");
                    final String client = finalObj.optJSONObject(i).optString(
                            "client");
                    final String upperLimit = finalObj.optJSONObject(i).optString(
                            "upper-limit");
                    final String debt = finalObj.optJSONObject(i).optString(
                            "debt");



                    long id1=databaseHelper.insert(new Info(client,orderAmount,date ,orderNumber,upperLimit,debt));
                //  long id1 = databaseHelper.insert(info);

                    if(id1 < 0)
                    {
                        Toast.makeText(getApplicationContext(), "unsuccessfull add", Toast.LENGTH_LONG).show();
                    }
                    else
                    {
                        Toast.makeText(getApplicationContext(), "done", Toast.LENGTH_LONG).show();
                    }


                    // select all



                }


                  rs = databaseHelper.selectAll();

                    databaseHelper.close();
                    Log.i("size", finalObj.length()+"");
            }//try end

            catch (JSONException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
                return rs;
        }



        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
            pd.setTitle("fetching");
            pd.setMessage("waiting...");
            pd.show();
        }



        @Override
        protected void onPostExecute(ArrayList<Info> result) {
            // TODO Auto-generated method stub


            SetAdapterList(result);

            pd.dismiss();
        }


        private void SetAdapterList(ArrayList<Info> result) 
        {
            // TODO Auto-generated method stu

 CustomAdapter adapter=new CustomAdapter(getApplicationContext(),result);
            list.setAdapter(adapter);
//          

        }

        }

}

强文我想要做的是从链接中获取所有JSON数据..它显示在logcat中，所以我成功了...然后我尝试将其插入使用dbhelper和info类的数据库，其中包含所有值的getter和setter ..但每次我在这里运行代码我得到的东西：

02-19 01:09:34.490: E/AndroidRuntime(1210): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Answer 1

你是从工作线程调用的。您需要从主线程中调用Toast.makeText（）（以及处理UI的大多数其他函数）。您可以使用处理程序，例如

activity.runOnUiThread(new Runnable() {
  public void run() {
    Toast.makeText(activity, "Hello", Toast.LENGTH_SHORT).show();
  }
});

Answer 2

首先，您必须从网络获取JSON数据并将其存储在结构中。所以，第一步将是这样的。对于json解析我使用了Gson库。您还必须为将从请求中接收的对象创建模型类。

private void getJSONModelHttpRequest(){
    AsyncHttpClient asyncClient = new AsyncHttpClient();
    asyncClient.get(YOUR_URL_HERE   , new AsyncHttpResponseHandler(){
        @Override
        public void onStart(){ 
        }

        @Override 
        public void onSuccess(String response){

            try {

                JSONObject jsonObj  = new JSONObject(response);
                Gson gson = new Gson();
                ModelClass model = gson.fromJson(jsonObj.toString() , ModelClass.class);
                // store the models in a array list or something like that to have the data available in the future
                Log.d(“Model”, " model = " +teamModel.getAnAtttributeVal);

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        @Override
        public void onFailure(Throwable e,String response){

        }

        @Override
        public void onFinish(){
            // Your database insertions here
            }
    });
}

Answer 3

如果您使用处理程序的消息传递功能，也可以使用处理程序本身调用Toast。

我们所做的是使用线程内的sendMessage（）方法传递您的字符串消息，

handler.sendMessage(msgObj);

和tehn使用，

在处理程序的handleMessage（Message msg）方法中获取消息

String aResponse = msg.getData().getString("message");

完整示例here.

Answer 4

你的代码中的

就是这样的。首先创建一个处理程序并将数据发送给处理程序，无论你想要显示什么

  if(id1 < 0)
                    {
                     Message msg=new Message();
                  msg.obj=unsuccessfull add;
                     handle.sendMessage(msg);

                    }

Handler handle=new Handler(){

    public void handleMessage(Message msg) {
  String data=(String)msg.obj;
 Toast.makeText(activity, data, Toast.LENGTH_SHORT).show();

        }


};

Answer 5

我发现了问题..这是因为敬酒......我们无法在doInBackground服务中干杯..我的代码工作得很好..

如何获取JSON数据并存储在DataBase中然后显示到自定义适配器列表视图？

5 个答案: