我通过Base Adapter创建一个Custom ListView，如下面的代码所示。 其实我需要获得CustomListView的长度。感谢您在Advance中的帮助
public class ListViewWithBaseAdapter extends Activity {
public class codeLeanChapter {
String chapterName;
String chapterDescription;
}
CodeLearnAdapter chapterListAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view_with_simple_adapter);
chapterListAdapter = new CodeLearnAdapter();
ListView codeLearnLessons = (ListView)findViewById(R.id.listView1);
codeLearnLessons.setAdapter(chapterListAdapter);
codeLearnLessons.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
codeLeanChapter chapter = chapterListAdapter.getCodeLearnChapter(arg2);
Toast.makeText(ListViewWithBaseAdapter.this, chapter.chapterName,Toast.LENGTH_LONG).show();
}
});
}
// ---------------------------------------------Adapter class Start from Here--------------------------------------------------------------
public class CodeLearnAdapter extends BaseAdapter {
List<codeLeanChapter> codeLeanChapterList = getDataForListView();
@Override
public int getCount() {
// TODO Auto-generated method stub
return codeLeanChapterList.size();
}
@Override
public codeLeanChapter getItem(int arg0) {
// TODO Auto-generated method stub
return codeLeanChapterList.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
if(arg1==null)
{
LayoutInflater inflater = (LayoutInflater) ListViewWithBaseAdapter.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
arg1 = inflater.inflate(R.layout.listitem, arg2,false);
}
TextView chapterName = (TextView)arg1.findViewById(R.id.textView1);
TextView chapterDesc = (TextView)arg1.findViewById(R.id.textView2);
codeLeanChapter chapter = codeLeanChapterList.get(arg0);
chapterName.setText(chapter.chapterName);
chapterDesc.setText(chapter.chapterDescription);
return arg1;
}
public codeLeanChapter getCodeLearnChapter(int position)
{
return codeLeanChapterList.get(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.list_view_with_simple_adapter, menu);
return true;
}
public List<codeLeanChapter> getDataForListView()
{
List<codeLeanChapter> codeLeanChaptersList = new ArrayList<codeLeanChapter>();
for(int i=0;i<10;i++)
{
codeLeanChapter chapter = new codeLeanChapter();
chapter.chapterName = "Chapter "+i;
chapter.chapterDescription = "This is description for chapter "+i;
codeLeanChaptersList.add(chapter);
}
return codeLeanChaptersList;
}
}
答案 0 :(得分：1)
对于BaseAdapter，我的建议是使用ViewHolder模式进行行项目创建。
如果您希望得到列表视图的总长度，而不是设置数据后的总长度，或者根据列表集合大小得到。
int totalListViewsize = adapter.getCount（）;
在下面发布的代码中，我提到了getview类中的注释及其所需的位置
public class ListViewWithBaseAdapter extends Activity {
ListView listView;
public class codeLeanChapter {
String chapterName;
String chapterDescription;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view_with_simple_adapter);
listView = (ListView) findViewById(R.id.listView1);
ListViewCustomAdapter adapter = new ListViewCustomAdapter(this,
getDataForListView());
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
codeLeanChapter chapter = adapter.getItem(arg2);
Toast.makeText(ListViewWithBaseAdapter.this, chapter.chapterName,Toast.LENGTH_LONG).show();
}
});
int totalListViewsize = adapter.getCount();
}
public List<codeLeanChapter> getDataForListView() {
List<codeLeanChapter> codeLeanChaptersList = new ArrayList<codeLeanChapter>();
for (int i = 0; i < 10; i++) {
codeLeanChapter chapter = new codeLeanChapter();
chapter.chapterName = "Chapter " + i;
chapter.chapterDescription = "This is description for chapter " + i;
codeLeanChaptersList.add(chapter);
}
return codeLeanChaptersList;
}
private class ListViewCustomAdapter extends BaseAdapter {
Context context;
int totalDisplayDatasize = 0;
List<codeLeanChapter> codeLeanChapterList;
public ListViewCustomAdapter(Context context,
List<codeLeanChapter> codeLeanChapterList) {
this.context = context;
this.codeLeanChapterList = codeLeanChapterList;
if (this.codeLeanChapterList != null)
totalDisplayDatasize = this.codeLeanChapterList.size();
System.out.println("Inside ListViewCustomAdapter ");
}
@Override
public int getCount() {
// this could be one of the reason for not showing listview.set
// total data length for count
return totalDisplayDatasize;
}
@Override
public codeLeanChapter getItem(int i) {
return this.codeLeanChapterList.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
private class Holder {
TextView textView1, textView2;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder = null;
View view = convertView;
/*
* First time for row if view is not created than inflate the view
* and create instance of the row view Cast the control by using
* findview by id and store it in view tag using holder class
*/
if (view == null) {
holder = new Holder();
// / No need to create LayoutInflater instance in
// constructor
convertView = LayoutInflater.from(this.context).inflate(
R.layout.listitem, null);
holder.textView1 = (TextView) convertView
.findViewById(R.id.textView1);
holder.textView2 = (TextView) convertView
.findViewById(R.id.textView2);
convertView.setTag(holder);
} else {
/*
* Here view next time it wont b null as its created and
* inflated once and in above if statement its created. And
* stored it in view tag. Get the holder class from view tag
*/
holder = (Holder) convertView.getTag();
}
holder.textView1.setText("chapterDescription : "
+ codeLeanChapterList.get(position).chapterDescription);
holder.textView2.setText("chapterName : "
+ codeLeanChapterList.get(position).chapterName);
return convertView;
}
}
}