使用自定義列表視圖時訪問行項目android

Question

我正在使用自定義列表視圖來創建包含每行上的開關和文本視圖的列表視圖。每行都是從一個名爲row.xml的xml文件創建的，列表視圖位於主活動xml文件內。這2個XML文件可以在下面看到。

HomeActivity.xml

<FrameLayout 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:background="#0099cc" tools:context=".Activities.HomeActivity"> 

<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    android:background="#ff69539d"> 

    <ListView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/listView" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="120dp" 
     android:layout_below="@+id/fullscreen_content_controls"/> 

</RelativeLayout> 

row.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <Switch 
     android:layout_width="wrap_content" 
     android:layout_height="fill_parent" 
     android:id="@+id/switch" 
     android:checked="false" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginLeft="10dp" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="Switch Name" 
     android:id="@+id/textView" 
     android:layout_alignBottom="@+id/switch" 
     android:layout_toRightOf="@+id/switch" 
     android:layout_marginLeft="20dp" 
     android:layout_marginStart="20dp" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentEnd="true" 
     android:textColor="#000000" /> 
</RelativeLayout> 

我使用自定義列表適配器來填充與文本的文本框列表視圖。這可以在下面看到。

customlistAdapter

public class customListAdapter extends BaseAdapter{ 

    Context context; 
    String[] switchName; 
    private static LayoutInflater inflater = null; 

    public customListAdapter(Context context, String[] data) { 
     // TODO Auto-generated constructor stub 
     this.context = context; 
     this.switchName = data; 
     inflater = (LayoutInflater) context 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return switchName.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return switchName[position]; 
    } 

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

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     View vi = convertView; 
     if (vi == null) 
      vi = inflater.inflate(R.layout.row, null); 
     TextView text = (TextView) vi.findViewById(R.id.textView); 
     Switch mySwitch = (Switch) vi.findViewById(R.id.switch); 
     mySwitch.setTag(position); 
     text.setText(switchName[position]); 
     return vi; 
    } 
} 

名單適配器與主要活動創建爲你可以看到下面。

MainActivity

public class MainActivity extends Activity { 

    ListView lv; 

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

     setContentView(R.layout.activity_main); 

     lv = (ListView) findViewById(R.id.listView); 
     lv.setAdapter(new customListAdapter(this, new String[]{"Switch 1", "Switch 2 ", "Switch 3", "Switch 4", "Switch 5", "Switch 6", "Switch 7"})); 

    } 
} 

，我有是能夠訪問由主要活動自定義列表適配器中創建的交換機的問題。我需要能夠保留對主要活動中所有開關的引用，以便我可以更改這些狀態​​。理想情況下，我可以在mainActivity中擁有每個開關的列表或數組。任何幫助，將不勝感激。

Answer 1

在你的適配器類，添加類似：

private OnCheckChangedListener mOnCheckChangedListener; 
public void setOnCheckChangedListener(OnCheckChangedListener listener){ 
    mOnCheckChangedListener = listener; 
} 

然後在適配器的getView方法，這樣做：

mySwitch.setOnCheckChangedListener(mOnCheckChangedListener); 

然後在活動，所以你想要什麼：

private OnCheckChangedListener mOnCheckChangedListener = new OnCheckChangedListener(){ 
    @Override 
    onCheckedChanged(CompoundButton buttonView, boolean isChecked){ 
    // keep a list of what was checked 
    } 
} 

並將其設置在適配器上：

BaseAdapter adapter = new customListAdapter(this, new String[]{"Switch 1", "Switch 2 ", "Switch 3", "Switch 4", "Switch 5", "Switch 6", "Switch 7"}); 
adapter.setOnCheckChangedListener(mOnCheckChangedListener); 
lv.setAdapter(adapter);