我使用一个ListView,以显示它的项目相同的项目,这是该单元的布局:适配器返回
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/lon"
android:id="@+id/textView5"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="@+id/foto"
android:layout_alignParentTop="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/lat"
android:id="@+id/textView6"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textlon"
android:layout_alignBottom="@+id/foto"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/textlat"
android:layout_alignTop="@+id/textlon"
android:layout_alignParentEnd="true" />
</RelativeLayout>
像每一个ListView控件,它需要一个适配器:
public class FotoAdapter extends BaseAdapter {
private ArrayList<BeanFotos> fotos;
private LayoutInflater inflater=null;
Context c;
public FotoAdapter(Context c, ArrayList<BeanFotos> fotos){
this.fotos=fotos;
inflater=LayoutInflater.from(c);
this.c=c;
}
@Override
public int getCount() {
//this returns the proper size of the array, if I have 3 photos it returns 3
Log.i("David", "In adapter, the size of the array is: "+fotos.size());
return fotos.size();
}
@Override
public Object getItem(int position) {
//this is never called
Log.i("David", "returning item "+position);
return fotos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
//This returns 0 always
Log.i("David", "returning position "+position);
int bmWidth=fotos.get(position).getFoto().getWidth();
int bmHeight=fotos.get(position).getFoto().getHeight();
int ivWidth;
int ivHeigth;
int new_width;
int new_height;
convertView=inflater.inflate(R.layout.foto_layout, null);
holder=new ViewHolder();
holder.lat=(TextView)convertView.findViewById(R.id.textlat);
holder.lon=(TextView)convertView.findViewById(R.id.textlon);
holder.foto=(ImageView)convertView.findViewById(R.id.foto);
ivWidth=dpToPx(80);
ivHeigth=dpToPx(80);
new_width=ivWidth;
new_height = (int) Math.floor((double) bmHeight *((double) new_width/(double) bmWidth));
Bitmap newbitMap = Bitmap.createScaledBitmap(fotos.get(position).getFoto(), new_width, new_height, true);
holder.lat.setText(fotos.get(position).getLatitud().toString());
holder.lon.setText(fotos.get(position).getLongitud().toString());
holder.foto.setImageBitmap(newbitMap);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
private int dpToPx(int dp)
{
float density = c.getResources().getDisplayMetrics().density;
return Math.round((float)dp * density);
}
static class ViewHolder {
public TextView lat;
public TextView lon;
public ImageView foto;
}
}
如果我设置了一个调试点,照片被拍摄,我可以看到我拍摄的不同照片,但是在ListView中显示的是同一张照片(第一张)。如果我在适配器中设置了调试点,则存储包含照片的对象的数组具有适当的大小,并且存储的照片不同...但列表视图总是显示相同的照片,尽管它显示了适当的数量行。
这是怎么发生的?我该如何解决它?任何帮助?
谢谢。
亲爱的,请添加代码“ivWidth = dpToPx(80); ivHeigth = dpToPx(80) ; new_width = ivWidth; new_height =(int)Math.floor((double)bmHeight *((double)new_width /(double)bmWidth)); 位图newbitMap = Bitmap.createScaledBitmap(fotos.get(position).getFoto (),new_width,new_height,true); holder.lat.setText(fotos.get(position).getLatitud()。toString()); holder.lon.setText(fotos.get(position).getLongitud()。toString()); holder.foto.setImageBitmap(newbitMap);“在返回视图之前 –