ListView与Button的共存有关问题解决

ListView与Button的共存问题解决
?这些一直在弄来电短信拒接的功能，页面用ListView 来实现在，想在其中加入按钮，加入之后，但按钮点击事件没有反应
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝public class SmsRejectCallView extends ListView
{???
???
??? Button imageBtn;
??? Resources res = getResources();
???
??? SmsRejectClikListener mClickListener;
??? String [] mStrings = res.getStringArray(R.array.sms_reject);
??? ArrayAdapter<String> mAdapter;
???

??? public SmsRejectCallView(Context context)
??? {??
??????? super(context);
??????? iniList(context);
??? }?

??? public SmsRejectCallView(Context context, AttributeSet attrs)
??? {
??????? super(context, attrs);
??????? iniList(context);
??? }

??? public SmsRejectCallView(Context context, AttributeSet attrs, int defStyle)
??? {
??????? super(context, attrs, defStyle);
??????? iniList(context);
??? }???

??? private void iniList(Context context)
??? {???????
??????? setOnItemClickListener(mOnClickListener);
??????? //Add by kylin 2011.09.23 begin
??????? LayoutParams layoutPrams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
??????? imageBtn = new Button(context);
??????? imageBtn.setLayoutParams(layoutPrams);
??????? String imageBtnName =? res.getString(R.string.news_sms);
??????? imageBtn.setText(imageBtnName);
???????? imageBtn.setFocusable(false);
??????? addHeaderView(imageBtn);
??????? //end
??????? mAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, mStrings);
??????? setAdapter(mAdapter);
??? }

??? private AdapterView.OnItemClickListener mOnClickListener = new AdapterView.OnItemClickListener()
??? {
??????? public void onItemClick(AdapterView<?> parent, View v, int position, long id)
??????? {
??????????? if (mClickListener == null)
??????????? {
??????????????? return;
??????????? }
???????????
??????????? if (position == 0)
??????????? {
??????????? ??? mClickListener.onClikNewSms();
??????????? }
??????????? else
??????????? {
??????????????? String sms = (String)(mAdapter.getItem(position-1));
??????????????? mClickListener.onClickSmsItem(sms);
??????????? }
???????????
??????? }
??? };


??? public interface SmsRejectClikListener
??? {
??????? public void onClikNewSms();
??????? public void onClickSmsItem(String sms);
??? }
???????
??? public void setSmsRejectSelectedListener(SmsRejectClikListener listener)
??? {
??????? mClickListener = listener;
??? }

}








这两天在捣鼓ListView widget，为了在ListView中加入Button这类的有 “点击” 事件的widget，请教了不少高手，感谢LandMark对我的认真讲解，下面把解决过程描述一下。?ListView 和 其它能触发点击事件的widget无法一起正常工作的原因是加入其它widget后，ListView的itemclick事件将无法触发，被其它widget的click事件屏蔽。?首先，说明一下，ListView中每一行包括以下三项：??? 一个ImageView， 一个TextView，一个ImageButton，依次排开。?以下是layout的内容，分为两部分：res/layout/main.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="fill_parent"
????android:padding="10dip" android:orientation="vertical">

????<ListView android:id="@id/android:list" android:layout_width="fill_parent"
????????android:layout_height="fill_parent" />
</LinearLayout>

因为继承了ListActivity，所以ListView 的id设置为"@id/android:list"是必须的

注意：

在<RelativeLayout>中

android:descendantFocusability="blocksDescendants"

和<ImageButton>中

android:focusable="false"

这两项的设置很关键，如果不设置，将导致ListView的ItemClick事件将无法触发，该事件被ImageButton的click事件屏蔽了。

<?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="wrap_content"
??android:padding="5dip"
??android:descendantFocusability="blocksDescendants" >
??
??<ImageView
??????android:id="@+id/ItemImage"
????android:layout_width="wrap_content"
????android:layout_height="wrap_content"
????android:padding="5dip"
??/>
??
??
??<!--
??????把按钮背景设置为透明: ????android:background="#00000000"
??????把按钮背景设置为半透明: ????android:background="#e0000000"
??????-->
??<ImageButton
?????android:id="@+id/ItemCloseWin"
?????
?????android:layout_alignParentRight="true"
?????android:layout_alignTop="@+id/ItemWinName"
??????android:layout_alignBottom="@+id/ItemWinName"
??????android:layout_width="wrap_content"
??????android:layout_height="wrap_content"
??????
??????android:background="#e0000000"
??????android:gravity="left|center_vertical"
??????android:focusable="false"
??????android:src="@android:drawable/ic_menu_close_clear_cancel"
??/>
??
??<TextView
??????android:id="@+id/ItemWinName"
??????
??????android:layout_toRightOf="@+id/ItemImage"
??????android:layout_toLeftOf="@+id/ItemCloseWin"
??????android:layout_alignTop="@+id/ItemImage"
??????android:layout_alignBottom="@+id/ItemImage"
??????android:layout_width="wrap_content"
??????android:layout_height="wrap_content"
??????
??????android:gravity="left|center_vertical"
??????android:textSize="20dip"
??????android:text="title"
??/>
????
???
</RelativeLayout>

在lvWithButtonExt中，为了能处理ImageButton的click事件，我继承了BaseAdapter类，并重新实现了getView()接口，在其中加入了Button的clicklistener，详见lvButtonAdapter类的实现。

public class lvWithButtonExt extends ListActivity {
????@Override
????protected void onCreate(Bundle savedInstanceState) {
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.main);

????????// 关联Layout中的ListView
????????ListView vncListView = (ListView)findViewById(android.R.id.list);
????????
????????// 生成动态数组，加入数据?
????????ArrayList<HashMap<String, Object>> remoteWindowItem = new ArrayList<HashMap<String, Object>>();
????????for(int i=0;i<10;i++)
????????{
????????????HashMap<String, Object> map = new HashMap<String, Object>();
????????????map.put("ItemImage", R.drawable.firefox);//图像资源的ID?
????????????map.put("ItemWinName", "Window ID "+i);
????????????map.put("ItemCloseWin", android.R.drawable.ic_menu_close_clear_cancel);
????????????remoteWindowItem.add(map);
????????}
????????
??????// 生成适配器的Item和动态数组对应的元素?
????????lvButtonAdapter listItemAdapter = new lvButtonAdapter(
????????????this,
????????????remoteWindowItem,//数据源?
????????????R.layout.lvitem,//ListItem的XML实现

????????????//动态数组与ImageItem对应的子项?
????????????new String[] {"ItemImage","ItemWinName", "ItemCloseWin"},
????????????//ImageItem的XML文件里面的一个ImageView,两个TextView ID?
????????????new int[] {R.id.ItemImage,R.id.ItemWinName,R.id.ItemCloseWin}
????????);
????????
????????vncListView.setAdapter(listItemAdapter);
????}

????@Override
????protected void onListItemClick(ListView l, View v, int position, long id) {
????????// TODO Auto-generated method stub
????????super.onListItemClick(l, v, position, id);
????????l.getItemAtPosition(position);
????}
}

为了响应按钮的点击事件，首先要记录按钮的位置，然后为按钮设置clicklistener。

在重新实现的getView()接口中，我使用了lvButtonListener监听类，在构造函数中，记录行号，以便在OnClick接口中能准确的定位按钮所在的位置，进而对相应的行进行处理。

public class lvButtonAdapter extends BaseAdapter {
????private class buttonViewHolder {
????????ImageView appIcon;
????????TextView appName;
????????ImageButton buttonClose;
????}
????
????private ArrayList<HashMap<String, Object>> mAppList;
????private LayoutInflater mInflater;
????private Context mContext;
????private String[] keyString;
????private int[] valueViewID;
????private buttonViewHolder holder;
????
????public lvButtonAdapter(Context c, ArrayList<HashMap<String, Object>> appList, int resource,
????????????String[] from, int[] to) {
????????mAppList = appList;
????????mContext = c;
????????mInflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
????????keyString = new String[from.length];
????????valueViewID = new int[to.length];
????????System.arraycopy(from, 0, keyString, 0, from.length);
????????System.arraycopy(to, 0, valueViewID, 0, to.length);
????}
????
????@Override
????public int getCount() {
????????return mAppList.size();
????}

????@Override
????public Object getItem(int position) {
????????return mAppList.get(position);
????}

????@Override
????public long getItemId(int position) {
????????return position;
????}

????public void removeItem(int position){
????????mAppList.remove(position);
????????this.notifyDataSetChanged();
????}
????
????@Override
????public View getView(int position, View convertView, ViewGroup parent) {
????????if (convertView != null) {
????????????holder = (buttonViewHolder) convertView.getTag();
????????} else {
????????????convertView = mInflater.inflate(R.layout.lvitem, null);
????????????holder = new buttonViewHolder();
????????????holder.appIcon = (ImageView)convertView.findViewById(valueViewID[0]);
????????????holder.appName = (TextView)convertView.findViewById(valueViewID[1]);
????????????holder.buttonClose = (ImageButton)convertView.findViewById(valueViewID[2]);
????????????convertView.setTag(holder);
????????}
????????
????????HashMap<String, Object> appInfo = mAppList.get(position);
????????if (appInfo != null) {
????????????String aname = (String) appInfo.get(keyString[1]);
????????????int mid = (Integer)appInfo.get(keyString[0]);
????????????int bid = (Integer)appInfo.get(keyString[2]);
????????????holder.appName.setText(aname);
????????????holder.appIcon.setImageDrawable(holder.appIcon.getResources().getDrawable(mid));
????????????holder.buttonClose.setImageDrawable(holder.buttonClose.getResources().getDrawable(bid));
????????????holder.buttonClose.setOnClickListener(new lvButtonListener(position));
????????}????????
????????return convertView;
????}

????class lvButtonListener implements OnClickListener {
????????private int position;

????????lvButtonListener(int pos) {
????????????position = pos;
????????}
????????
????????@Override
????????public void onClick(View v) {
????????????int vid=v.getId();
????????????if (vid == holder.buttonClose.getId())
????????????????removeItem(position);
????????}
????}
}

?

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备注1； 对于Android开发来说处理一些界面需要和Adapter适配器打交道，虽然Android自带了一些比如ArrayAdapter但是大多数情况下无法满足我们需要，所以就要从BaseAdapter派生一个类满足我们特殊的需要。

? 首先我们可能重写getView()，通过LayoutInflater的inflate方法映射一个自己定义的Layout布局xml加载或从xxxView中创建。这些大家可能滚瓜烂熟了但是仍然很多Android开发者对于BaseAdapter中notifyDataSetChanged()方法不是很理解，notifyDataSetChanged方法通过一个外部的方法控制如果适配器的内容改变时需要强制调用getView来刷新每个Item的内容。