在制作我自己的SimpleAdapter对象之前因为我想改变行的颜色,我只是使用了新的SimpleAdapter(...)。现在我使用自己的自定义SimpleAdapter,行颜色正在改变,但我的文本没有更新。我调用了adapter.notifyDataSetChanged(),但它仍然只显示示例文本 - “TextView”。正如我所说,当我没有创建自己的适配器时,一切正常。我怀疑它可能与我正在初始化的命令有关:
public class AddScreen extends Activity implements OnClickListener,
OnItemClickListener, OnItemLongClickListener {
SimpleAdapter adapter;
List<HashMap<String, String>> painItems = new ArrayList<HashMap<String, String>>();
ListView listthings;
int[] to;
String[] from;
public void onCreate(Bundle savedInstanceState) {
...
listthings = (ListView) findViewById(R.id.listthings);
from = new String[] { "row_1", "row_2" };
to = new int[] { R.id.row1, R.id.row2 };
adapter = new Adapter(this, painItems, R.layout.mylistlayout,
from, to);
listthings.setAdapter(adapter);
...
}
public class Adapter extends SimpleAdapter{
HashMap<String, String> map = new HashMap<String, String>();
public Adapter(Context context, List<? extends Map<String, String>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
View row = convertView;
if (row == null) {
LayoutInflater mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = mInflater.inflate(R.layout.mylistlayout, parent, false);
}
row.setBackgroundColor(0xFF0000FF);
TextView rw1 = (TextView)findViewById(R.id.row1);
// TextView rw2 = (TextView)findViewById(R.id.row2);
rw1.setText(map.get(position));
return row;
}
}
// to add the item, put it in the map, and add the map into the list
private void addItem() {
HashMap<String, String> map = new HashMap<String, String>();
map.put("row_1", row1);
map.put("row_2", row2);
map.put("row_3", painLevelString);
map.put("row_4", painLocation);
map.put("row_5", timeOfPainString);
map.put("row_6",textTreatmentString);
painItems.add(map);
adapter.notifyDataSetChanged();
}
编辑:添加代码
这就是我从intent(onActivityResult())获取数据的方式,放在addItem代码之前:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == 1) {
row1 = data.getStringExtra("com.painLogger.row1");
row2 = data.getStringExtra("com.painLogger.row2");
painLevelString = data.getStringExtra("com.painLogger.painLevel");
painLocation = data.getStringExtra("painLocation");
timeOfPainString = data.getStringExtra("com.painLogger.painTime");
textTreatmentString = data
.getStringExtra("com.painLogger.treatment");
addItem();
}
}
*另外,如果这是相关的,则放置顺序为:onCreate() - &gt;自定义适配器类 - &gt; onActivityResult() - &gt; addItem()* **
以下是它的外观截图。每个项目中的两个TextView字段应填充信息(他们是这样做的,直到我这样做)。
答案 0 :(得分:5)
如果之前只使用new SimpleAdapter(...)
,那么在您的getView(...)
实施中将第一行更改为:
View row = super.getView(position, convertView, parent);
看看这是否是你所期待的。取出LayoutInflater
的东西。
答案 1 :(得分:1)
在getView()
中,关于设置行背景的位置,您还应该设置TextView
的文字。
调用notifyDataSetChanged()
,不会自动设置您的文本,只会导致ListView
使用新数据重绘可见行...实际上每行调用getView()
需要刷新。
我还建议设置mylistlayout.xml
文件的背景颜色,如果getView()函数开始使用findViewByID
,你还应该考虑使用“视图持有者”方法比如此示例:http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/List14.html
答案 2 :(得分:1)
您需要在getView()
中设置文字。像这样:
public View getView(int position, View convertView, ViewGroup parent){
TextView text;
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.mylistlayout, parent, false);
text = (TextView) convertView.findViewById(R.id.more_list_text);
}
convertView.setBackgroundColor(0xFF0000FF);
text.setText(map.get(position));
return convertView;
}
此外,这非常重要 - 将您的地图存储为SimpleAdapter
的成员变量
即,将此行放在对象定义的顶部:
HashMap<String, String> map = new HashMap<String, String>();