如何將ListView放入片段

Question

我試圖將ListView放入片段中，但是我的應用崩潰了。 我跟着this guide學習如何將ListView放入一個活動中，但我想將它放在一個片段中，所以我稍微更改了一下代碼。 這是我的片段：

公共類FaqFragment擴展片段{

public static Fragment newInstance() { 
    FaqFragment fragment = new FaqFragment(); 
    Bundle args = new Bundle(); 
    fragment.setArguments(args); 
    return fragment; 
} 

private ListView listView1; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View v = inflater.inflate(R.layout.fragment_faq, container, false); 

    Element element_data[] = new Element[] 
    { 
     new Element(R.drawable.goccia, "Goccia1"), 
     new Element(R.drawable.goccia, "Goccia2"), 
     new Element(R.drawable.goccia, "Goccia3"), 
     new Element(R.drawable.goccia, "Goccia4"), 
     new Element(R.drawable.goccia, "Goccia5") 
    }; 

    ElementAdapter adapter = new ElementAdapter(getActivity(), android.R.layout.simple_list_item_1, element_data); 


    listView1 = (ListView)v.findViewById(R.id.listView1); 

    View header = (View)getLayoutInflater(savedInstanceState).inflate(R.layout.element, null); 
    listView1.addHeaderView(header); 

    listView1.setAdapter(adapter); 

    return v; 
} 

這是我ArrayAdapter：

public class ElementAdapter extends ArrayAdapter<Element>{ 

FragmentActivity context; 
int layoutResourceId;  
Element data[] = null; 

public ElementAdapter(FragmentActivity fragmentActivity, int layoutResourceId, Element[] data) { 
    super(fragmentActivity, layoutResourceId, data); 
    this.layoutResourceId = layoutResourceId; 
    this.context = fragmentActivity; 
    this.data = data; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View row = convertView; 
    WeatherHolder holder = null; 

    if(row == null) 
    { 
     LayoutInflater inflater = ((FragmentActivity)context).getLayoutInflater(); 
     row = inflater.inflate(layoutResourceId, parent, false); 

     holder = new WeatherHolder(); 
     holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon); 
     holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle); 

     row.setTag(holder); 
    } 
    else 
    { 
     holder = (WeatherHolder)row.getTag(); 
    } 

    Element element = data[position]; 
    holder.txtTitle.setText(element.title); 
    holder.imgIcon.setImageResource(element.icon); 

    return row; 
} 

static class WeatherHolder 
{ 
    ImageView imgIcon; 
    TextView txtTitle; 
} 

}

這是我Element：

public class Element { 
public int icon; 
public String title; 
public Element(){ 
    super(); 
} 

public Element(int icon, String title) { 
    super(); 
    this.icon = icon; 
    this.title = title; 
} 

}

該應用程序有3個標籤，當我刷到標籤頁的應用程序崩潰這裏是我已經寫的代碼（片段）。

在logcat中有這樣的錯誤：

03-13 11:25:39.455: E/AndroidRuntime(2840): at com.example.bluhackathon.ElementAdapter.getView(ElementAdapter.java:47)

我試圖刪除行47，48和ArrayAdapter 49和應用程序沒有崩潰（當然還有空元素的列表。

線47，48，49：

Element element = data[position]; 
    holder.txtTitle.setText(element.title); 
    holder.imgIcon.setImageResource(element.icon); 

Answer 1

嘗試使用ListFragment也可以按照從vogella

指南

Answer 2

你可以使用ListFragment來實現它，下面是我實現「將listview放入一個Fragment，並從MySQL獲取數據」的答案，我昨天寫了它，希望它能幫助你解決問題。

package com.ecnu.vendingmachine; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

import org.apache.http.NameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.ListFragment; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 

import com.ecnu.vendingmachine.widgets.JSONParser; 

public class VendingFragment extends ListFragment { 

    private String Tag = "VendingFragment"; 
    private static final String TAG_SUCCESS = "success"; 

    private ListView listView; 

    // Progress Dialog 
    private ProgressDialog pDialog; 
    // Creating JSON Parser object 
    JSONParser jsonParser = new JSONParser(); 
    JSONArray vendingmachine = null; 

    ArrayList<HashMap<String, String>> vendinglist; 

    // url to get all products list 
    MainActivity main = new MainActivity(); 
    private String url_all_vendingmachine = main.getIP() 
      + "vendingmachine/get_all_vendingmachine.php"; 

    // products JSONArray 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 

     return inflater.inflate(R.layout.vending_main, container, false); 
    } 

    @Override 
    public void onViewCreated (View view, Bundle savedInstanceState) { 

     vendinglist = new ArrayList<HashMap<String, String>>(); 
     //listView = (ListView) view.findViewById(R.id.list); 

     listView = getListView(); 
     new get_all_vendingmachine().execute(); 
    } 

    class get_all_vendingmachine extends AsyncTask<String, String, String> { 

     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(getActivity()); 
      pDialog.setMessage("Creating Product.."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(true); 
      pDialog.show(); 
      Log.i(Tag, "pDialog"); 
     } 

     protected String doInBackground(String... args) { 

      // Building Parameters 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 

      Log.i(Tag, url_all_vendingmachine); 
      // getting JSON Object 
      // Note that create product url accepts POST method 

      JSONObject json = jsonParser.makeHttpRequest(
        url_all_vendingmachine, "GET", params); 

      // check log cat for response 
      Log.i(Tag, json.toString()); 

      // check for success tag 
      try { 
       int success = json.getInt(TAG_SUCCESS); 

       if (success == 1) { 
        // Ada record Data (SUCCESS = 1) 
        // Getting Array of vendingmachine 
        vendingmachine = json.getJSONArray("vendings"); 

        // looping through All vendingmachine 
        for (int i = 0; i < vendingmachine.length(); i++) { 
         JSONObject c = vendingmachine.getJSONObject(i); 

         // Storing each json item in variable 
         String id = c.getString("VMid"); 
         String name = c.getString("Name"); 
         String address = c.getString("Address"); 
         Log.i(Tag, id); 
         Log.i(Tag, name); 
         Log.i(Tag, address); 
         // creating new HashMap 
         HashMap<String, String> map = new HashMap<String, String>(); 
         // adding each child node to HashMap key => value 
         map.put("VMid", id); 
         map.put("Name", name); 
         map.put("Address", address); 

         // adding HashList to ArrayList 
         vendinglist.add(map); 
        } 

       } else { 
        // failed to create product 
        getActivity().finish(); 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
      // dismiss the dialog once done 
      pDialog.dismiss(); 
      getActivity().runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        // updating listview 
        // HashMap<String, String>中的key 
        String[] from = { "Name", "Address", "VMid" }; 
        // list_item.xml中對應的控件ID 
        int[] to = { R.id.vending_name, R.id.vending_address, 
          R.id.vending_id }; 
        Log.i(Tag, from[0]); 
        SimpleAdapter adapter = new SimpleAdapter(getActivity(), 
          vendinglist, R.layout.vending_list, from, to); 
        listView.setAdapter(adapter); 
       } 
      }); 
     } 

    } 

} 

的vending_main_xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="@color/whiteColor" > 

    <include 
     android:id="@+id/layout_buy_title_actionbar" 
     layout="@layout/headbar_title" /> 

    <ListView 
     android:id="@id/android:list" 
     android:layout_below="@id/layout_buy_title_actionbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:cacheColorHint="@android:color/transparent" 
     android:divider="@drawable/reader_item_divider" 
     android:listSelector="@android:color/transparent" > 
    </ListView> 

</RelativeLayout> 

的vending_list.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="@dimen/selectVmListCell_Height" 
    android:orientation="vertical" > 

    <RelativeLayout 
     android:layout_width="fill_parent" 
     android:layout_height="@dimen/selectVmListCell_Height" 
     android:layout_gravity="center_vertical" 
     android:background="@drawable/bg_listview" 
     android:gravity="center_vertical" 
     android:paddingLeft="@dimen/layout_Margin_10" > 

     <LinearLayout 
      android:id="@+id/imageTypeLayout" 
      android:layout_width="@dimen/smallImage_HW_45" 
      android:layout_height="fill_parent" 
      android:layout_alignParentLeft="true" 
      android:layout_centerVertical="true" 
      android:gravity="center_vertical" 
      android:orientation="vertical" > 

      <ImageView 
       android:id="@+id/vendingImage" 
       style="@style/smallImageStyle" 
       android:src="@drawable/buy_main_not_shop" /> 

      <TextView 
       android:id="@+id/distanceText" 
       style="@style/smallTxtStyle" 
       android:layout_gravity="center_horizontal" 
       android:gravity="center" 
       android:singleLine="true" 
       android:textColor="@color/lightOrangeColor" /> 
     </LinearLayout> 

     <RelativeLayout 
      android:id="@+id/vendingSave" 
      android:layout_width="47.0dip" 
      android:layout_height="fill_parent" 
      android:layout_alignParentRight="true" 
      android:layout_centerVertical="true" > 

      <ImageView 
       android:id="@+id/vendingSaveImage" 
       android:layout_width="27.0dip" 
       android:layout_height="27.0dip" 
       android:layout_centerInParent="true" 
       android:layout_centerVertical="true" 
       android:background="@drawable/bg_favor_btn" /> 
     </RelativeLayout> 

     <LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:layout_centerVertical="true" 
      android:layout_marginLeft="@dimen/layout_Margin_10" 
      android:layout_toLeftOf="@id/vendingSave" 
      android:layout_toRightOf="@id/imageTypeLayout" 
      android:gravity="center_vertical" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/vending_name" 
       style="@style/midDarkGrayTxtStyle" 
       android:layout_width="fill_parent" /> 

      <TextView 
       android:id="@+id/vending_address" 
       style="@style/smallLightGrayTxtStyle" 
       android:layout_width="fill_parent" 
       android:maxLines="2" /> 

      <LinearLayout 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:orientation="horizontal" > 

       <TextView 
        style="@style/smallLightGrayTxtStyle" 
        android:text="Number：" /> 

       <TextView 
        android:id="@+id/vending_id" 
        style="@style/smallLightGrayTxtStyle" /> 
      </LinearLayout> 
     </LinearLayout> 
    </RelativeLayout> 

</LinearLayout> 

希望它可以幫助你找到如何把列表視圖成片段。 我的listview中的元素很複雜，如果你只想要一行，它比我的代碼更簡單。