我有自定义Array List，它连接到我的数组列表的每一行的适配器和自定义XML。点击项目时，我已经制作了字符串生成器警报，当我确认它时，我想更改自定义数组列表中显示的图像。到目前为止，我无法以某种方式更新所选项目的新图像列表。你知道吗，怎么做？有没有办法如何跟踪，点击列表中的哪个位置？是恢复方法和某种“重绘”最佳解决方案吗？
由于
编辑：为我正在使用的适配器添加了代码：
public class datamanagerAdapter extends ArrayAdapter<mapObject>{
private ArrayList<mapObject> items;
private Context ctx;
String rememberName="";
public datamanagerAdapter(Context context, int textViewResourceId, ArrayList<mapObject> items) {
super(context, textViewResourceId, items);
this.items = items;
this.ctx = context;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
final mapObject mo = items.get(position);
if (mo != null) {
ImageView imv = (ImageView) v.findViewById(R.id.selected);
TextView one = (TextView) v.findViewById(R.id.mapname);
TextView two = (TextView) v.findViewById(R.id.map_contains);
TextView three = (TextView) v.findViewById(R.id.map_size);
if (one != null) {
one.setText(""+mo.getMapName());
}
if(two != null){
two.setText(""+ mo.getMapContains());
}
if(three != null){
three.setText("Size: "+ mo.getMapSize()+"MB POI: "+mo.getMapContainsPoi()+"");
}
if (imv != null) {
imv.setImageDrawable(mo.getImage());
}else{
imv.setImageDrawable(v.getResources().getDrawable(R.drawable.cross));
}
v.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
showDetails(mo, ctx);
}
private void showDetails(final mapObject mo, final Context ctx) {
final Context mContext = ctx.getApplicationContext();
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Service.LAYOUT_INFLATER_SERVICE);
final View layout = inflater.inflate(R.layout.custom_dialog,null);
AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
builder.setView(layout);
final AlertDialog alertDialog = builder.create();
TextView l1=(TextView) layout.findViewById(R.id.lineone);
TextView l2=(TextView) layout.findViewById(R.id.linetwo);
TextView l3=(TextView) layout.findViewById(R.id.linethree);
TextView l4=(TextView) layout.findViewById(R.id.linefour);
TextView l5=(TextView) layout.findViewById(R.id.linefive);
TextView l6=(TextView) layout.findViewById(R.id.linesix);
TextView l7=(TextView) layout.findViewById(R.id.lineseven);
Button select=(Button) layout.findViewById(R.id.selectActiveMap);
Button cancel=(Button) layout.findViewById(R.id.closeWindowButton);
rememberName=mo.getMapName();
l1.setText("...");
l2.setText("Map: "+mo.getMapName());
l3.setText("Covered Area: "+mo.getMapContains());
l4.setText("Size: "+mo.getMapSize()+" MB");
l5.setText("POI: "+mo.getMapContainsPoi());
l6.setText("Source: "+mo.getMapSource());
l7.setText("Version: "+mo.getMapVersion());
select.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//here I want to change image which is displayed in the list. If I select this map, I ant to have displayed "tick" better than a "cross" which is used by default.
}
alertDialog.dismiss();
}
});
cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
alertDialog.dismiss();
}
});
alertDialog.show();
}
});
}
return v;
}
}
答案 0 :(得分：1)
你的getView()方法的代码很乱，它的方法应该很简单：
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) ctx
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.stacktest3_row, null);
}
final mapObject mo = items.get(position);
if (mo != null) {
ImageView imv = (ImageView) v.findViewById(R.id.selected);
TextView one = (TextView) v.findViewById(R.id.mapname);
TextView two = (TextView) v.findViewById(R.id.map_contains);
TextView three = (TextView) v.findViewById(R.id.map_size);
if (one != null) {
one.setText("" + mo.getMapName());
}
if (two != null) {
two.setText("" + mo.getMapContains());
}
if (three != null) {
three.setText("Size: " + mo.getMapSize() + "MB POI: "
+ mo.getMapContainsPoi() + "");
}
if (imv != null) {
imv.setImageDrawable(mo.getImage());
} else {
imv.setImageDrawable(v.getResources().getDrawable(
R.drawable.cross));
}
}
return v;
}
如果您想要一个列表行点击监听器，那么如果您扩展onListItemClick(ListView l, View v, int position, long id)或在ListActivity元素上设置setOnItemClickListener()，则必须实施方法ListView如果你延长Activity。然后在onItemClick()方法中：
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
mapObject item = l.getItemAtPosition(position);
showDetails(item, context); //see what context you can use
}
然后在选择按钮中：
select.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//If you want to change the image then put your new image(or drawable or what ever) or id in the ITEM mapObject that you pass to the method showDetails() then call notifyDataSetChanged() on your adapter object
alertDialog.dismiss();
}
});