在使用片段中的ListView时，适配器不调用getView（）

因此，在编写应用程序时，我遇到了另一个“惊喜”问题。我知道有ListFragment，但使用片段。当我为ListView的一个片段添加标记时，当您在列表中调用适配器时，函数不会添加元素 - 这不是我在日志中跟踪的一种狡猾的方式，您不会调用getView（）。更有趣的是 - 如果我不使用片段列表而不是使用片段列表，并且在所有内容（列表已填充）上添加适配器时都能正常工作。我不明白为什么会发生这种情况 - 为什么在作品的片段列表中不够充分。在使用片段中的ListView时，适配器不调用getView（）

activity_start.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"  
    android:descendantFocusability="beforeDescendants" 
    android:focusableInTouchMode="true" 
    android:scrollbars="vertical" 
    android:scrollbarStyle="insideInset" 
    android:gravity="center_vertical" 
    android:orientation="vertical" 
    android:background="#e8e8e8" 
    > 

<Button 
    android:id="@+id/button_add_url" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="center" 
    android:drawableRight="@drawable/green_add" 
    android:drawablePadding="5dp" 
    android:text="ADD URL" 
    />  

<LinearLayout 
    android:id="@+id/linear_layout_list_show_monitor_url" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:background="@drawable/border_background" 
    android:orientation="vertical" 
    android:padding="1dp" 
    android:layout_marginLeft="16dp" 
    android:layout_marginRight="16dp" 
    > 


    <!-- <ListView 
     android:id="@+id/list_view_fragment" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> -->  

    <fragment 
     android:id="@+id/fragment_list" 
     android:name="pront.android.exservice.FragmentList" 
     android:layout_width="match_parent" 
     android:layout_height="300dp"/>   

</LinearLayout>

StartActivity.java

import java.util.ArrayList; 
import pront.android.exservice.FragmentDialogAddNewUrl.FragmentDialogAddNewUrlConectActivity; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.content.pm.ActivityInfo; 
import android.graphics.Typeface; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.support.v4.app.DialogFragment; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 
import android.util.Log; 
import android.view.Gravity; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TableLayout.LayoutParams; 
import android.widget.Toast; 

public class StartActivity 
         extends FragmentActivity 
         implements OnClickListener, 
            FragmentDialogAddNewUrlConectActivity 
{ 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
    this.getWindow().addFlags 
    (WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    setContentView(R.layout.activity_start); 
    listViewUrl = (ListView) findViewById(R.id.list_view_fragment); 
    screenWidthPx = this.getResources().getDisplayMetrics().widthPixels; 
    screenHeightPx = this.getResources().getDisplayMetrics().heightPixels; 
    layoutMarginPx = 16; 
    screenDp = this.getResources().getDisplayMetrics().density; 
    layoutMarginDp = (int)(layoutMarginPx*screenDp); 
    typefaceRoboto = Typeface.createFromAsset(getAssets(), 
      "Roboto-Thin.ttf"); 
    LinearLayout linearLayout = (LinearLayout) 
      findViewById(R.id.linear_layout_list_show_monitor_url); 
    LayoutParams layoutParams = 
      new LayoutParams(LayoutParams.FILL_PARENT, 
        LayoutParams.WRAP_CONTENT);   
    layoutParams.setMargins(layoutMarginDp, layoutMarginDp, 
      layoutMarginDp, layoutMarginDp); 
    linearLayout 
     .setLayoutParams(layoutParams); 
    buttonAddUrl = (Button) findViewById(R.id.button_add_url); 
    buttonAddUrl.setTypeface(typefaceRoboto, Typeface.BOLD); 
    buttonAddUrl.setOnClickListener(this);   
    broadcastReceiver = new MyBroadcastReceiver(); 
    intentFilter = new IntentFilter(BROADCAST); 
    registerReceiver(broadcastReceiver, intentFilter); 
} 

public void onStart(){ 
    super.onStart(); 
} 

public void onRestart(){ 
    super.onRestart(); 
} 

public void onResume(){ 
    super.onResume(); 
} 

public void onPause(){ 
    super.onPause(); 
} 

public void onStop(){ 
    super.onStop(); 
} 

public void onDestroy(){ 
    unregisterReceiver(broadcastReceiver); 
    super.onDestroy(); 
} 

@Override 
public void onBackPressed(){ 
    super.onBackPressed(); 

} 

public void onClick(View view) { 
    if(view.getId() == R.id.button_add_url){ 
     buttonAddUrl.setClickable(false); 
     fragmentDialogAddNewUrl = new FragmentDialogAddNewUrl(); 
     fragmentDialogAddNewUrl.show(this.getSupportFragmentManager(), 
       "fragmentDialogAddNewUrl"); 
     buttonAddUrl.setClickable(true); 
    }   
} 

public void fragmentDialogClickButtonListener(String url, 
               String pathFavIcon) 
{ 
    fragmentDialogAddNewUrl.onDestroyView();   
    this.url = url; 
    Toast toastInfo = Toast 
        .makeText(this.getApplicationContext(), 
        "Service start monitor\n"+url, 
        Toast.LENGTH_LONG); 
    toastInfo.setGravity(Gravity.TOP, 0, 0); 
    toastInfo.show(); 
    arrayListUrl.add(new UrlBox(this.getApplicationContext(), 
      url, 
      pathFavIcon)); 
    Log.d("StartActivity", "fragmentDialogClick...() listViewUrl.setAdapter()"); 
    FragmentList fragmentList = (FragmentList) this.getSupportFragmentManager().findFragmentById(R.id.fragment_list); 
    fragmentList.setAdapter(arrayListUrl); 
//  MyListAdapter adapter = new MyListAdapter(this, R.layout.expandable_list_view_child_item, arrayListUrl); 
//  adapter.notifyDataSetChanged(); 
//  listViewUrl.setAdapter(adapter);     
} 

public static class MyBroadcastReceiver extends BroadcastReceiver{ 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     Log.d("", intent.getIntExtra("RESULT", 0)+"");      
    } 

} 

private Button buttonAddUrl; 
private ListView listViewUrl; 

private MyBroadcastReceiver broadcastReceiver;  
private IntentFilter intentFilter; 
private Typeface typefaceRoboto; 
private DialogFragment fragmentDialogAddNewUrl; 

private MyListAdapter myListAdapter = null; 
private ArrayList<UrlBox> arrayListUrl = new ArrayList<UrlBox>(); 
private int layoutMarginPx;  
private float screenDp; 
private int screenWidthPx; 
private int screenHeightPx; 
private int layoutMarginDp; 
private ArrayList<String> childUrl = new ArrayList<String>(); 
private ArrayList<Drawable> childFavIcon = new ArrayList<Drawable>(); 
private String url; 
private final static String BROADCAST = "pront.android.exservice"; 

}

FragmentList.java

import java.util.ArrayList; 
import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListView; 

public class FragmentList extends Fragment { 

@Override 
public void onAttach(Activity activity){ 
    super.onAttach(activity); 
} 

@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState);  
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){ 
    listView = (ListView) inflater.inflate(R.layout.layout_fragment_list, null, false).findViewById(R.id.list_view_fragment); 
    return inflater.inflate(R.layout.layout_fragment_list, null, false); 
} 

public void setAdapter(ArrayList<UrlBox> arrayList){ 
    listAdapter = new MyListAdapter(getActivity(), R.layout.expandable_list_view_child_item, arrayList); 
    listAdapter.notifyDataSetChanged(); 
    if(listView != null){ 
     listView.setAdapter(listAdapter);   
     System.out.println("set adapter"); 
    }   
} 

MyListAdapter listAdapter; 
ListView listView; 

}

MyListAdapter.java

import java.util.ArrayList; 
import android.app.Activity; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

public class MyListAdapter extends ArrayAdapter{ 

MyListAdapter(Activity context, int layoutResourceId, ArrayList<UrlBox> arrayList) { 
    super(context, layoutResourceId); 
    Log.d("MyListAdapter", "constructor"); 
    this.context = context; 
    this.arrayListUrlBox = arrayList; 
    this.layoutResourceId = layoutResourceId; 
} 

@Override 
public View getView (int position, View convertView, ViewGroup parent){ 
    Log.d("MyListAdapter", "getView"); 
    View returnView = convertView; 
    ListItemTagHolder tag = null; 
    if(convertView == null){ 
     LayoutInflater inflater = context.getLayoutInflater(); 
     returnView = inflater.inflate(layoutResourceId, null, false); 
     tag = new ListItemTagHolder(); 
     tag.ImageViewFavicon = (ImageView) returnView.findViewById(R.id.image_view_favicon); 
     tag.ImageViewStatus = (ImageView) returnView.findViewById(R.id.image_view_status); 
     tag.TextViewUrl = (TextView) returnView.findViewById(R.id.text_view_url); 
     returnView.setTag(tag); 
    } 
    else{ 
     tag = (ListItemTagHolder) returnView.getTag(); 
    } 
    tag.ImageViewFavicon.setImageDrawable(arrayListUrlBox.get(position).getDrawableFavIcon()); 
    tag.ImageViewStatus.setImageDrawable(arrayListUrlBox.get(position).getDrawableFavIcon()); // ! 
    tag.TextViewUrl.setText(arrayListUrlBox.get(position).getUrl()); 
    return returnView;  
} 

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

public UrlBox getItem(int position) { 
    return arrayListUrlBox.get(position); 
} 

private ArrayList<UrlBox> arrayListUrlBox; 
private Activity context; 
private int layoutResourceId; 

static class ListItemTagHolder{ 
    protected ImageView ImageViewFavicon; 
    protected ImageView ImageViewStatus; 
    protected TextView TextViewUrl; 
} 
}

来源

2012-12-12 Siruk Viktor

的问题与MyListAdapter。你有两个选择：

覆盖getCount()，让它

通行证返回数据集中的项目数，以超（）数据集

例如，在你的适配器：

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

或MyListAdapter构造函数中，你可以拨打：

super(context, layoutResourceId, arrayList);

代替

super(context, layoutResourceId);

来源

2012-12-12 13:56:55 Blackbelt

第一点已经实施。第二个 - 调用超类的构造函数 - 没有任何帮助 - 可能在某些方面发生了变化，但列表中的元素仍然没有添加。 –

@SirukViktor对于误解抱歉。你确定数据集不是空的吗？防止getView被调用的唯一原因是数据集为空 – Blackbelt

非常好看，我一定会检查它），但有人想知道为什么通常列表中的所有情况都能很好地解决问题。 –

嗨修改MyListAdapter如下

public class MyListAdapter extends ArrayAdapter**<UrlBox>** { 

    MyListAdapter(Activity context, int layoutResourceId, ArrayList<UrlBox> arrayList) { 
super(context, layoutResourceId, arrayList); 
Log.d("MyListAdapter", "constructor", **arrayList**); 
this.context = context; 
this.arrayListUrlBox = arrayList; 
this.layoutResourceId = layoutResourceId; 
} 
....<continue with rest part of your code>...

有2个地方我已经改变了..希望这将做的工作。

来源

2013-04-29 10:24:17 TNSharma

在使用片段中的ListView时，适配器不调用getView（）

回答

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