ListView 资源整理

1.ListView中让onClick和onItemClick事件共存

将具有点击事件控件的android:focusable属性置成false就可以了。

2.listView的选中颜色
ListView选中时默认是黄色，很多时候会和我们软件的配色不符合，那么我就教你如何修改默认的ListView配色，改变ListView选中颜色有两个方法：

（1）. 在程序中：

 Drawabledrawable=getResources().getDrawable(R.drawable.touch_feedback);
 ListView.setSelector(drawable);

（2）. 在xml里面的ListView标签下添加：

 android:listSelector=”#00000000″//后面的颜色可以自己定这样写是透明的

3.记录和恢复ListView滚动的位置

有时候我们需要记录当前ListView滚动到的位置，重新加载的时候要回到原位，不罗嗦，给出代码：

 //列表滚动
 privateOnScrollListenerScrollLis=newOnScrollListener(){

 @Override
 publicvoidonScroll(AbsListViewarg0,intarg1,intarg2,intarg3){
 }

 @Override
 publicvoidonScrollStateChanged(AbsListViewview,intscrollState){
 if(scrollState==OnScrollListener.SCROLL_STATE_IDLE){
 ListPos=list.getFirstVisiblePosition();//ListPos记录当前可见的List顶端的一行的位置
 }
 }
 };

接下来就是还原位置，放在ListView加载之后：

 list.setSelection(ListPos);

4.关于android ListView的美化

用心的朋友应该会发现，listview中在设置了背景之后。会有些问题。
1.、listview在拖动的时候背景图片消失变成黑色背景。等到拖动完毕我们自己的背景图片才显示出来。
2 、listview的上边和下边有黑色的阴影。
3、lsitview的每一项之间需要设置一个图片做为间隔。
针对以上问题 在listview的xml文件中设置一下语句。


问题1 有如下代码结解决 android:scrollingCache=”false” 或 android:cacheColorHint=”#00000000″
问题2 用如下代码解决：android:fadingEdge=”none”
问题3 用如下代码解决： android:divider=”@drawable/list_driver” 其中 @drawable/list_driver 是一个图片资源



5.ListView 中添加按钮，动态删除添加ItemView的操作

要实现添加按钮的操作，必须自定义Adapter，使用Button View的setTag()方法，将Button所属的位置设置到tag当中
要实现动态添加删除ItemView的操作，必须首先调整调整Adapter所绑定的数据源，然后调用Adapter的notifyDataSetChanged()方法

以下为实现的一个实例

 packagecom.jason.joysmsyd;

 importjava.util.ArrayList;
 importjava.util.HashMap;
 importjava.util.List;
 importjava.util.Map;

 importandroid.app.ListActivity;
 importandroid.content.Intent;
 importandroid.os.Bundle;
 importandroid.view.LayoutInflater;
 importandroid.view.View;
 importandroid.view.ViewGroup;
 importandroid.view.Window;
 importandroid.view.View.OnClickListener;
 importandroid.widget.BaseAdapter;
 importandroid.widget.Button;
 importandroid.widget.EditText;
 importandroid.widget.TextView;

 publicclassSendMainextendsListActivityimplementsOnClickListener{

 ButtonbuttonMessage,buttonContact,buttonHistory;
 EditTexttextMessage;

 List<Map<String,String>>contacts=newArrayList<Map<String,String>>();



 @Override
 protectedvoidonCreate(BundlesavedInstanceState){
 //TODOAuto-generatedmethodstub
 super.onCreate(savedInstanceState);
 this.requestWindowFeature(Window.FEATURE_NO_TITLE);

 this.setContentView(R.layout.layout_send);

 buttonMessage=(Button)this.findViewById(R.id.ButtonMessage);
 buttonContact=(Button)this.findViewById(R.id.ButtonContact);
 buttonHistory=(Button)this.findViewById(R.id.ButtonHistory);

 textMessage=(EditText)this.findViewById(R.id.EditTextMessage);
 textMessage.setText(this.getIntent().getExtras().getString("message"));

 }

 publicvoidonClick(Viewv){
 //TODOAuto-generatedmethodstub
 switch(v.getId()){
 caseR.id.ButtonMessage:
 this.finish();
 break;
 caseR.id.ButtonContact:
 {
 Intentintent=newIntent();
 intent.setAction("com.jason.action.contact");
 this.startActivityForResult(intent,0);
 }
 break;
 caseR.id.ButtonHistory:
 {
 Intentintent=newIntent();
 intent.setAction("com.jason.action.history");
 this.startActivityForResult(intent,1);
 }
 break;
 }

 }


 protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
 //TODOAuto-generatedmethodstub
 super.onActivityResult(requestCode,resultCode,data);
 if(requestCode==0&&resultCode==RESULT_OK){
 this.getcontactFromString(data.getExtras().getString(
 UserSelectActivity.RETURN_LIST));
 bindDataToList();
 }
 }

 privatevoidgetcontactFromString(Stringdata){
 if(data==null||data.length()==0){
 return;
 }


 String[]arrayContact=data.split("#");
 for(StringsingleContact:arrayContact){
 if(singleContact!=null&&singleContact.length()>0){
 String[]props=singleContact.split(":");
 if(props.length==2){
 Map<String,String>contact=newHashMap<String,String>();
 contact.put("name",props[0]);
 contact.put("phone",props[1]);
 contacts.add(contact);

 }
 }

 }

 }

 privatevoidbindDataToList(){
 this.setListAdapter(newMyAdapter());
 }

 publicclassMyAdapterextendsBaseAdapter{

 publicintgetCount(){
 //TODOAuto-generatedmethodstub
 returncontacts.size();
 }

 publicObjectgetItem(intposition){
 //TODOAuto-generatedmethodstub
 returncontacts.get(position);
 }

 publiclonggetItemId(intposition){
 //TODOAuto-generatedmethodstub
 returnposition;
 }


 publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
 //TODOAuto-generatedmethodstub
 LayoutInflaterinflater=SendMain.this.getLayoutInflater();
 finalViewview=inflater.inflate(R.layout.layout_user_item,null);
 finalTextViewtextPhone=(TextView)view.findViewById(R.id.text1);
 finalTextViewtextName=(TextView)view.findViewById(R.id.text2);
 Buttonbutton=(Button)view.findViewById(R.id.buttonDelete);

 textPhone.setText(contacts.get(position).get("phone"));
 textName.setText(contacts.get(position).get("name"));

 button.setTag(position);

 button.setOnClickListener(newOnClickListener(){

 publicvoidonClick(Viewv){
 //TODOAuto-generatedmethodstub
 intposition=Integer.parseInt(v.getTag().toString());
 contacts.remove(position);
 MyAdapter.this.notifyDataSetChanged();

 //SendMain.this.getListView().refreshDrawableState();
 }});




 returnview;
 }

 }
 }

6.Android ListView 清单与其Trigger 触发事件

Android ListView 清单与其选择时的触发事件,

可以参考下面的程式范例 :

 publicclasshelloWorldextendsActivity{

 String[]vData=null;

 publicvoidonCreate(BundlesavedInstanceState){
 super.onCreate(savedInstanceState);

 //要做为ArrayAdapter的资料来源
 vData=newString[]{"足球","棒球","篮球"};

 //建立"阵列接收器"
 ArrayAdapter<String>arrayData=newArrayAdapter<String>(
 this
 ,android.R.layout.simple_list_item_1
 ,vData
 );

 //建立ListView物件
 ListViewlv=newListView(this);

 //设定ListView的接收器,做为选项的来源
 lv.setAdapter(arrayData);

 //ListView设定Trigger
 lv.setOnItemClickListener(newOnItemClickListener(){

 publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,
 longarg3){
 //TODOAuto-generatedmethodstub
 setTitle(getResources().getString(R.string.app_name)+":"+vData[arg2]);
 }
 });

 //设定ListView为ContentView
 setContentView(lv);
 }
 }

7.ListView内容刷新问题

最近在学习Android的listView控件时遇到了一个问题，如何添加一个Item到ListView中并及时的刷新出来。在网上查了很多帖子，很多人在问，也很多人在解答，但是总的来说都没找到详细的解决方案。对于ListView与数据库的同步，高手们建议使用ContentProvider对象。但是如果我不使用数据库呢？也有人回答用notifyDataSetChanged()方法。这倒是一个正确的解决方案，但是对于新手来说，还是比较困惑怎么去用，这里我贴一下我的用法：

 OnClickListenerlistener2=newOnClickListener(){
 @Override
 publicvoidonClick(Viewv){
 //TODOAuto-generatedmethodstub
 Map<String,Object>m=newHashMap<String,Object>();
 StringtiString=tv.getText().toString();//注意这里我为什么要取出这个EditText的内容
 m.put("prod_na",tiString);//而不这样写m.put("prod_na",tv.getText());
 m.put("prod_type",tiString);//因为tv.getText()返回的是Editable对象，真正的数据是被缓存的，
 //也就是说你后续的EditText改动都会影响之前添加的Item
 coll.add(m);

 //取回Adapter对象，用于调用notifyDataSetChanged方法。
 SimpleAdaptersAdapter=(SimpleAdapter)lv.getAdapter();
 sAdapter.notifyDataSetChanged();
 }
 };

这里涉及到了Android中的MVC模式概念，如何存储数据，控制和显示。

你可以认为ListView是一个View,那么mode是什么呢？显然是SimpleAdapter对象，而Control又是什么呢？那只能是notifyDataSetChanged()了。当数据变化时，也就是SimpleAdapter所处理的数据变化了，那么我们就需要调用 notifyDataSetChanged 去通知View作出改变。

8.checkBox的显示和隐藏。

在listView中，每个item都有一个ChexBox，当显示的时候在listView外面设置一个按钮，点击显示和隐藏listView中所有的checBox；

开始的我的实现方法为：

Button add = (Button)findViewById(R.id.add);
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {

if(flage){checkBox.setVisibility(View.VISIBLE);flage=!flage;}
else{checkBox.setVisibility(View.GONE);flage=!flage;}
}
});

后来发现，只能改变listView中第一个checBox，对listView中其他的item不起作用。

以上做法不对，正确的做法是在Adapter中的getView中设置隐藏和显示，做法如下：

在getView中，

final CheckBox checkBox = (CheckBox) view.findViewById(R.id.checkBox);
if(flage){checkBox.setVisibility(View.VISIBLE);}
else{checkBox.setVisibility(View.GONE);}

然后在按钮点击事件中：

@Override
public void onClick(View v) {
flage=!flage;
mySubscriptionsListAdapt.notifyDataSetChanged();
}

notifyDataSetChanged();是实现listView刷新的功能，不需要再次加载整个listView。

源代码见：http://henzil.googlecode.com/svn/trunk/android.ListAsyncActivty/

10.ListView隔行设置颜色

 importjava.util.HashMap;
 importjava.util.List;

 importandroid.content.Context;
 importandroid.view.View;
 importandroid.view.ViewGroup;
 importandroid.widget.SimpleAdapter;

 publicclassSpecialAdapterextendsSimpleAdapter{
 privateint[]colors=newint[]{0x30FF0000,0x300000FF};

 publicSpecialAdapter(Contextcontext,List<HashMap<String,String>>items,intresource,String[]from,int[]to){
 super(context,items,resource,from,to);
 }

 @Override
 publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
 Viewview=super.getView(position,convertView,parent);
 intcolorPos=position%colors.length;
 view.setBackgroundColor(colors[colorPos]);
 returnview;
 }
 }

 SpecialAdapteradapter=newSpecialAdapter(this,fillMaps,R.layout.grid_item,from,to);
 ...

11.ListView横向移动

publicclassMyListViewextendsLinearLayoutimplementsOnGestureListener{
privateGestureDetectormGestureDetector;
privateListViewmListView;

publicMyListView(Contextcontext){
super(context);
mGestureDetector=newGestureDetector(this);
mListView=newListView(context);
String[]items=createStrings();
mListView.setAdapter(newArrayAdapter<String>(context,
android.R.layout.simple_list_item_single_choice,items));
mListView.setCacheColorHint(Color.TRANSPARENT);
mListView.setScrollBarStyle(SCROLLBARS_OUTSIDE_INSET);
mListView.setOnItemClickListener(newOnItemClickListener(){
@Override
publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,
longarg3){
Log.i("info","click");
}
});
this.addView(mListView,newLinearLayout.LayoutParams(350,LayoutParams.FILL_PARENT));
}

@Override
publicbooleanonDown(MotionEventarg0){
returnfalse;
}

@Override
publicbooleanonFling(MotionEvente1,MotionEvente2,floatvelocityX,
floatvelocityY){
returntrue;
}

@Override
publicvoidonLongPress(MotionEvente){
//empty
}

@Override
publicbooleanonScroll(MotionEvente1,MotionEvente2,floatdistanceX,
floatdistanceY){
intscrollWidth=mListView.getWidth()-this.getWidth();
if((this.getScrollX()>=0)&&(this.getScrollX()<=scrollWidth)&&(scrollWidth>0)){
intmoveX=(int)distanceX;
if(((moveX+this.getScrollX())>=0)&&((Math.abs(moveX)+Math.abs(this.getScrollX()))<=scrollWidth)){
this.scrollBy(moveX,0);
}
else{
if(distanceX>=0){
this.scrollBy(scrollWidth-Math.max(Math.abs(moveX),Math.abs(this.getScrollX())),0);
}
else{
this.scrollBy(-Math.min(Math.abs(moveX),Math.abs(this.getScrollX())),0);
}
}
}
returntrue;
}

@Override
publicvoidonShowPress(MotionEvente){
//empty
}

@Override
publicbooleanonSingleTapUp(MotionEvente){
returnfalse;
}

@Override
publicbooleandispatchTouchEvent(MotionEventev){
mGestureDetector.onTouchEvent(ev);
super.dispatchTouchEvent(ev);
returntrue;
}

privateString[]createStrings(){
returnnewString[]{
"AbbayedeBelloc","AbbayeduMontdesCats","Abertam","Abondance","Ackawi",
"Acorn","Adelost","AffideliceauChablis","Afuega'lPitu","Airag","Airedale",
"AisyCendre","AllgauerEmmentaler","Alverca","Ambert","AmericanCheese",
"AmiduChambertin","AnejoEnchilado","AnneauduVic-Bilh","Anthoriro","Appenzell",
"Aragon","ArdiGasna","Ardrahan","ArmenianString","AromesauGenedeMarc",
"Asadero","Asiago","AubisquePyrenees","Autun","Avaxtskyr","BabySwiss",
"Babybel","BaguetteLaonnaise","Bakers","Baladi","Balaton","Bandal","Banon",
"Barry'sBayCheddar","Basing","BasketCheese","BathCheese","BavarianBergkase",
"Baylough","Beaufort","Beauvoorde","BeenleighBlue","BeerCheese","BelPaese",
"Bergader","BergereBleue","Berkswell","BeyazPeynir","Bierkase","BishopKennedy",
"Blarney","Bleud'Auvergne","BleudeGex","BleudeLaqueuille",
"BleudeSeptmoncel","BleuDesCausses","Blue","BlueCastello","BlueRathgore",
"BlueVein(Australian)","BlueVeinCheeses","Bocconcini","Bocconcini(Australian)",
"BoerenLeidenkaas","Bonchester","Bosworth","Bougon","BouleDuRoves",
"Bouletted'Avesnes","Boursault","Boursin","Bouyssou","Bra","Braudostur",
"BreakfastCheese","BrebisduLavort","BrebisduLochois","BrebisduPuyfaucon",
"BresseBleu","Brick","Brie","BriedeMeaux","BriedeMelun","Brillat-Savarin",
"Brin","Brind'Amour","Brind'Amour","Brinza(BurdufBrinza)",
"BriquettedeBrebis","BriquetteduForez","Broccio","BroccioDemi-Affine",
"BrousseduRove","BruderBasil","BrusselaeKaas(FromagedeBruxelles)","Bryndza",
"Buchetted'Anjou","Buffalo","Burgos","Butte","Butterkase","Button(Innes)",

"BuxtonBlue","Cabecou","Caboc","Cabrales","Cachaille","Caciocavallo"

转自：http://blog.csdn.net/skydsai/article/details/6745277