when I try to add viewgroup as the listview's item. the listview will
not visiable.
follow is the code:
package com.test.mylistview;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class TestListViewActivity extends Activity {
private static final String TAG = "TestCWActivity";
private final static int VIEW_MARGIN = 2;
private int lastPosition = -1 ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTvList();
ListView ltv = (ListView) findViewById(R.id.listview);
ltv.setAdapter(new ListAdapt());
}
class ListAdapt extends BaseAdapter{
@Override
public int getCount() {
// TODO Auto-generated method stub
return tvlst.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup
parent) {
// TODO Auto-generated method stub
SelectionExam selectionExam;
if (convertView == null){
selectionExam = new SelectionExam(TestCWActivity.this);
if((lastPosition == -1 || lastPosition != position) &&
(lastPosition < 9)){
ImageView img = new ImageView(TestCWActivity.this);
img.setBackgroundColor(0xffeeff);
selectionExam.addView(img,new
LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams
.WRAP_CONTENT));
selectionExam.addView(tvlst.get(position),new
LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams
.WRAP_CONTENT));
Log.i(TAG, "add textview--->"+tvlst.get(position));
lastPosition = position;
}
}else{
selectionExam = (SelectionExam) convertView;
if((lastPosition == -1 || lastPosition != position) &&
(lastPosition < 9)){
ImageView img = new ImageView(TestCWActivity.this);
img.setBackgroundColor(0xffeeff);
selectionExam.addView(img,new
LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams
.WRAP_CONTENT));
selectionExam.addView(tvlst.get(position),new
LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams
.WRAP_CONTENT));
Log.i(TAG, "add textview--->"+tvlst.get(position));
lastPosition = position;
}
}
return selectionExam;
}
}
ArrayList<TextView> tvlst = new ArrayList<TextView>();
private void setTvList(){
for(int i=10; i<20; i++){
TextView tv = new TextView(this);
tvlst.add(tv);
}
}
class SelectionExam extends ViewGroup {
public SelectionExam(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int
heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Log.d(TAG, "widthMeasureSpec = " + widthMeasureSpec
// + " heightMeasureSpec = " +
heightMeasureSpec);
for (int index = 0; index < getChildCount(); index++) {
final View child = getChildAt(index);
child.measure(MeasureSpec.UNSPECIFIED,
MeasureSpec.UNSPECIFIED);
}
}
protected void onLayout(boolean changed, int left, int top, int
right,
int bottom) {
// Log.d(TAG, "changed = " + changed + " left = " + left +
" top = "
// + top + " right = " + right + " botom =
" + bottom);
final int count = getChildCount();
int row = 0;
int lengthX = left;
int lengthY = top;
for (int i = 0; i < count; i++) {
final View child = this.getChildAt(i);
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
lengthX += width + VIEW_MARGIN;
lengthY = row * (height + VIEW_MARGIN) +
VIEW_MARGIN + height
+ top;
if (lengthX > right) {
lengthX = width + VIEW_MARGIN + left;
row++;
lengthY = row * (height + VIEW_MARGIN)
+ VIEW_MARGIN
+ height + top;
}
child.layout(lengthX - width, lengthY - height,
lengthX,
lengthY);
}
}
}
}
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