爲什麼在ListView中imageButton不能切換直到滾動？

Question

我有一個簡單的listView通過自定義適配器。列表視圖中的每一行都由ImageButton和TextView組成。

想法是在用戶點擊它時更改ImageButton，但它不起作用。但是，ImageButton更改了滾動和回收的視圖。我的意思是，當用戶向下滾動列表並返回到頂部並點擊ImageButton時，它將按照預期爲那些滾動並返回的行起作用。

你們能幫我解決我失蹤的事嗎？我對Android非常陌生，爲了解決這個問題，我一直堅持了這一個星期。

這裏的APK對樣品測試程序： https://www.dropbox.com/s/pzlahtqkgj010m8/app-ListViewExample.apk?dl=0 這裏是我的代碼的相關部分：

avtivity_main.xml

<RelativeLayout 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:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> 


    <ListView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/listView" 

     /> 
</RelativeLayout> 

，並呈現單排在ListView以下XML被利用：

single_row.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginTop="20dp" 
    android:layout_marginBottom="20dp" 
    > 


    <ImageButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/imageButton" 
     android:src="@drawable/b" 
     android:layout_weight="2" 
     style="@style/ListView.first" 
     android:layout_gravity="center" 
     /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Large Text" 
     android:id="@+id/textView" 
     android:layout_weight="10" 
     android:layout_gravity="center" 
     /> 
</LinearLayout> 

來到Java代碼，

MainActivity.java是

public class MainActivity extends AppCompatActivity { 

    String[] titles; 
    ListView list; 
    private listViewAdapter adapter; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Resources res = getResources(); 

     titles = res.getStringArray(R.array.titles); 
     list = (ListView) findViewById(R.id.listView); 
     adapter = new listViewAdapter(this, titles); 
     list.setAdapter(adapter); 
    } 
} 

和自定義適配器listViewAdapter.java這個樣子

class sListItem { 
    public ImageButton button; 
    public TextView text; 
    public boolean active; 
} 

public class listViewAdapter extends ArrayAdapter<String> { 

    private final String[] titles; 
    Context context; 

    private int size = 15; 
    public sListItem mp[] = new sListItem[size]; 


    public listViewAdapter(Context context, String[] titles) { 
     super(context, R.layout.single_row, R.id.imageButton, titles); 
     this.context = context; 
     this.titles = titles; 

    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View row = inflater.inflate(R.layout.single_row, parent, false); 

     if(mp[position] == null) 
      mp[position] = new sListItem(); 

     mp[position].button = (ImageButton) row.findViewById(R.id.imageButton); 
     mp[position].button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       mp[position].active = !mp[position].active; 

       setIcon(position, mp[position].active); 
      } 
     }); 

     mp[position].text = (TextView) row.findViewById(R.id.textView); 
     mp[position].text.setText(titles[position]); 
     setIcon(position, mp[position].active); 

     return row; 
    } 


    private void setIcon(int position, boolean active) { 
     Drawable drawable; 

     if(active){ 
      drawable = getContext().getResources().getDrawable(R.drawable.a); 
     } else { 
      drawable = getContext().getResources().getDrawable(R.drawable.b); 
     } 
     mp[position].button.setImageDrawable(drawable); 
    } 
} 

編輯：添加了示例測試應用的鏈接。

Answer 1

你應該告訴適配器通過點擊收聽

mp[position].button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       mp[position].active = !mp[position].active; 
       setIcon(position, mp[position].active); 
       notifydatasetchanged(); 
      } 
     });