在Listview Android中不顯示圖像圖標？

我有一個listview項目來自數據庫。我試圖把圖像圖標的ListView項目在XML中。但是，它沒有顯示圖標。我嘗試了很多東西，但似乎沒有任何工作呢？在Listview Android中不顯示圖像圖標？

這裏是我的列表視圖：

public class TypeMenu extends AppCompatActivity { 

    private String TAG = TypeMenu.class.getSimpleName(); 
    String bid; 

    private ProgressDialog pDialog; 
    private ListView lv; 
    private static final String TAG_BID = "bid"; 

    // URL to get contacts JSON 
    private static String url = "http://cloud....com/brtemp/index.php"; 

    ArrayList<HashMap<String, String>> contactList; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_type_menu); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 




     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     contactList = new ArrayList<>(); 

     lv = (ListView) findViewById(R.id.list); 

     new GetContacts().execute(); 


     // on seleting single product 
     // launching Edit Product Screen 
     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

       // getting values from selected ListItem 

       HashMap<String, String> selected = contactList.get(position); 
       String selectedId= selected.get("id"); 
       Intent in = new Intent(getApplicationContext(), SubMenu.class); 
       // sending pid to next activity 
       in.putExtra("id",selectedId); 
       startActivityForResult(in, 100); 
       Toast.makeText(getApplicationContext(),"Toast" +selectedId ,Toast.LENGTH_SHORT).show(); 
      } 
     }); 
    } 

    /** 
    * Async task class to get json by making HTTP call 
    */ 
    private class GetContacts extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      // Showing progress dialog 
      pDialog = new ProgressDialog(TypeMenu.this); 
      pDialog.setMessage("Please wait..."); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
      // Toast.makeText(getApplicationContext(),"Toast",Toast.LENGTH_LONG).show(); 

     } 

     @Override 
     protected Void doInBackground(Void... arg0) { 
      HttpHandler sh = new HttpHandler(); 

      // Making a request to url and getting response 
     String jsonStr = sh.makeServiceCall(url); 

      Log.e(TAG, "Response from url: " + jsonStr); 





      if (jsonStr != null) { 
       try { 
        JSONArray jsonArry = new JSONArray(jsonStr); 

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

         JSONObject c = jsonArry.getJSONObject(i); 
         String id = c.getString("id"); 
         String type = c.getString("type"); 
         HashMap<String, String> contact = new HashMap<>(); 

         contact.put("id", id); 
         contact.put("type", type); 
         contactList.add(contact); 


        } 
       } catch (final JSONException e) { 
        Log.e(TAG, "Json parsing error: " + e.getMessage()); 
        runOnUiThread(new Runnable() { 
         @Override 
         public void run() { 
          Toast.makeText(getApplicationContext(), 
            "Json parsing error: " + e.getMessage(), 
            Toast.LENGTH_LONG) 
            .show(); 
         } 
        }); 

       } 
      } else { 
       Log.e(TAG, "Couldn't get json from server."); 
       runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 
         Toast.makeText(getApplicationContext(), 
           "Couldn't get json from server. Check LogCat for possible errors!", 
           Toast.LENGTH_LONG) 
           .show(); 
        } 
       }); 

      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 
      // Dismiss the progress dialog 
      if (pDialog.isShowing()) 
       pDialog.dismiss(); 
      /** 
      * Updating parsed JSON data into ListView 
      * */ 
      ListAdapter adapter = new SimpleAdapter(
        TypeMenu.this, contactList, 
        R.layout.list_item, new String[]{ "type","id"}, 
        new int[]{ 
        R.id.type,R.id.arrow1}); 

      lv.setAdapter(adapter); 
     } 

} 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case android.R.id.home: 
       onBackPressed(); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 
     }

上面的代碼，如果我把「R.id.Type，R.id.arrow1」然後列出LIS不開給我的錯誤。

這裏是我的Listview.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="wrap_content" 
    android:orientation="vertical" 
    > 

    <!-- Product id (pid) - will be DDEN - used to pass to other activity --> 



     <TextView 
      android:id="@+id/id" 
      android:layout_width="30dp" 
      android:layout_height="30dp"/> 

     <TextView 
      android:id="@+id/type" 
      android:textSize="20dp" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"/> 


    <ImageView 
     android:id="@+id/arrow1" 
     android:layout_width="match_parent" 
     android:layout_height="15dp" 
     android:layout_gravity="center" 
     android:layout_weight="3" 
     android:src="@drawable/dropdown" /> 

    </LinearLayout>

這裏是我的logcat：

E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.zeba.broccoli, PID: 1231 
        android.content.res.Resources$NotFoundException: Resource ID #0x1 
         at android.content.res.Resources.getValue(Resources.java:2452) 
         at android.support.v7.widget.AppCompatDrawableManager.loadDrawableFromDelegates(AppCompatDrawableManager.java:330) 
         at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:195) 
         at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:188) 
         at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100) 
         at android.support.v7.widget.AppCompatImageHelper.setImageResource(AppCompatImageHelper.java:73) 
         at android.support.v7.widget.AppCompatImageView.setImageResource(AppCompatImageView.java:81) 
         at android.widget.SimpleAdapter.setViewImage(SimpleAdapter.java:262) 
         at android.widget.SimpleAdapter.bindView(SimpleAdapter.java:192) 
         at android.widget.SimpleAdapter.createViewFromResource(SimpleAdapter.java:126) 
         at android.widget.SimpleAdapter.getView(SimpleAdapter.java:114) 
         at android.widget.AbsListView.obtainView(AbsListView.java:2828) 
         at android.widget.ListView.measureHeightOfChildren(ListView.java:1292) 
         at android.widget.ListView.onMeasure(ListView.java:1204) 
         at android.view.View.measure(View.java:18870) 
         at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728) 
         at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:464) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:703) 
         at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) 
         at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1367) 
         at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:768) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
         at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435) 
         at android.widget.LinearLayout.measureVertical(LinearLayout.java:721) 
         at android.widget.LinearLayout.onMeasure(LinearLayout.java:612) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435) 
         at android.widget.LinearLayout.measureVertical(LinearLayout.java:721) 
         at android.widget.LinearLayout.onMeasure(LinearLayout.java:612) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5908) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
         at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:3076) 
         at android.view.View.measure(View.java:18870) 
         at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2392) 
         at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1416) 
         at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1661) 
         at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1301) 
         at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7016) 
         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777) 
         at android.view.Choreographer.doCallbacks(Choreographer.java:590) 
         at android.view.Choreographer.doFrame(Choreographer.java:560) 
        at android.view.Choreographer$FrameDisplayEventRec 
I/Process: Sending signal. PID: 1231 SIG: 9 
Application terminated.

來源

2017-01-10 z.al

是'R.layout.list_item'和'Listview.xml'相同。我認爲你正在嘗試錯誤的'佈局' –

你使用哪個圖像加載器庫？ –

我沒有使用圖像加載器，它只是從XML –

@ z.al我理解你的處境，反而使你確信，SimpleAdapter只是幫助在字符串類型值填充到由ID指定的文本視圖。

但在你的情況，你應該實現自定義ArrayAdapter和getView（）方法，你可以設置圖像圖標ImageView的。

以下是簡單的片段讓你清楚：

public class Person { 

public HashMap<String, String> contact; 
void Person(HashMap<String, String> contact) { 
this.contact = contact; 
} 
} 

public class MyListAdapter extends ArrayAdapter<Person> { 

private Context context; 
private ArrayList<Person> contactList; 

private LayoutInflater mInflater; 
private boolean mNotifyOnChange = true; 

public MyListAdapter(Context context, ArrayList<Person> contactList) { 
    super(context, R.layout.my_row_layout); 
    this.context = context; 
    this.contactList = new ArrayList<>(contactList); 
    this.mInflater = LayoutInflater.from(context); 
} 

@Override 
public int getCount() { 
    return contactList.size(); 
} 

@Override 
public Person getItem(int position) { 
    return contactList.get(position); 
} 

@Override 
public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    final ViewHolder holder; 
    if (convertView == null) { 
     holder = new ViewHolder(); 
      convertView = mInflater.inflate(R.layout.my_row_layout,parent, false); 
      holder.name = (TextView) convertView.findViewById(R.id.textview_name); 
      holder.description = (TextView) convertView.findViewById(R.id.textview_description); 
     convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

Person person = contactList.get(position); 
    holder.name.setText(person.get("name")); 
    holder.image.setImageResource(person.get("id")); 
    holder.pos = position; 
    return convertView; 
} 

//---------------static views for each row-----------// 
    static class ViewHolder { 

     TextView name; 
     TextView description; 
     ImageView image; 
     int pos; //to store the position of the item within the list 
    } 
}

來源

2017-01-10 05:11:57 ChaitanyaAtkuri

但我想我已經轉移到recycleview..coz我想我的應用程序與所有最新車型正常運行...通過回答d方式THX –

的問題是SimpleAdapter是爲您的使用情況過於簡單。該文件解釋說，它最終會撥打setViewImage(ImageView, String)設置圖像;它不會告訴你的是，它預計該字符串通過Integer.parseInt()被轉換爲整數（不幸的是，文件是不是很好在這方面）。

你需要告訴您的適配器如何在您的ListView數據綁定到行。您可以通過調用setViewBinder()提供它ViewBinder做到這一點最低限度。不過，我的建議是，你寫通過擴展BaseAdapter定製適配器實現，因爲我的經驗是，人們很快超過由框架適配器提供了非常簡單的用法。

另外，也許你應該利用這個機會切換到RecyclerView因爲ListView是古老而笨重的。

來源

2017-01-10 04:43:41 Karakuri

我沒試過..你可以用這個代碼替換這個新的代碼android –

@ z.al no，因爲我對你的代碼一無所知。我已經給你一些非常明確的方向（包括'setViewBinder（）'一個簡單的路徑），一些努力，預計在你的一部分，你的代碼庫來實現這一點。 – Karakuri

你能給我一個簡單的例子鏈接，以便我能糾正我的錯誤嗎？ –

在Listview Android中不顯示圖像圖標？

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