我有一个ListView，它显示一个包含两个TextView的列表。在其中一个，我想要应用特定的颜色。所有数据（和颜色）都由Web服务的Json文件提供。
我使用了一个我想要使用的简单适配器。有人可以说明如何为每个项目设置特定的颜色吗？
这是我的班级：
public class NetworkTimeTableFragment extends Fragment {
private ProgressDialog pDialog;
private static String mylat;
private static String mylng;
// JSON Node names
private static final String TAG_NAME = "shop_name";
private static final String TAG_SHORT = "shop_address";
private static final String TAG_ID = "shop_url";
private static final String TAG_COLOR = "feuilletez";
TextView shop_address;
TextView shop_name;
TextView shop_url;
ImageButton feuilletez;
private ListView list;
// Hashmap for ListView
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
public NetworkTimeTableFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_timetable, container, false);
// Calling async task to get json
new GetJson().execute();
return rootView;
}
/**
* Async task class to get json by making HTTP call
*/
private class GetJson extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
String myurl = "routes.json";
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(myurl, ServiceHandler.GET);
JSONArray array = null;
try {
array = new JSONArray(jsonStr);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
for (int i = 0; i < array.length(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
String id = jsonObject.getString("id");
System.out.println("id --->" + id);
String url = jsonObject.getString("url");
System.out.println("url --->" + url);
String created_at = jsonObject.getString("created_at");
System.out.println("created_at --->" + created_at);
String updated_at = jsonObject.getString("updated_at");
System.out.println("updated_at --->" + updated_at);
String short_name = jsonObject.getString("short_name");
System.out.println("short_name --->" + short_name);
String long_name = jsonObject.getString("long_name");
System.out.println("long_name --->" + long_name);
String desc = jsonObject.getString("desc");
System.out.println("desc --->" + desc);
String type = jsonObject.getString("type");
System.out.println("type --->" + type);
String type_name = jsonObject.getString("type_name");
System.out.println("type_name --->" + type_name);
String color = jsonObject.getString("color");
System.out.println("color --->" + color);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_NAME, long_name);
map.put(TAG_SHORT, short_name);
map.put(TAG_COLOR, color);
map.put(TAG_ID, id);
oslist.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
list = (ListView) getActivity().findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(
getActivity(),
oslist,
R.layout.listview_routes_row,
new String[]{TAG_NAME, TAG_SHORT, TAG_COLOR},
new int[]{R.id.long_name, R.id.short_name});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// Intent intent = new Intent(NewsActivity.this, NewsActivity.class);
//intent.putExtra("shopurl",oslist.get(+position).get(TAG_URL));
// overridePendingTransition(R.anim.animationin, R.anim.animationout);
// startActivity(intent);
}
});
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
}
}
}
答案 0 :(得分：3)
实现您想要的更好方法是创建自定义适配器。 在这里我给你一个实现目标的例子......
活动布局 ---＆gt;的 activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<ListView
android:id="@+id/list_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
列出项目布局 ---＆gt;的 listview_routes_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="@+id/long_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dip" />
<TextView
android:id="@+id/short_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dip" />
</LinearLayout>
自定义SimpleAdapte ---＆gt;的 CustomSimpleAdapter.java
public class CustomSimpleAdapter extends SimpleAdapter {
private List<Map<String, Object>> itemList;
private Context mContext;
private static final String TAG_COLOR = "color";
private static final String TAG_NAME = "shop_name";
private static final String TAG_SHORT = "shop_address";
public CustomSimpleAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
this.itemList = (List<Map<String, Object>>) data;
this.mContext = context;
}
/* A Static class for holding the elements of each List View Item
* This is created as per Google UI Guideline for faster performance */
class ViewHolder {
TextView textLong;
TextView textShort;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_routes_row, null);
holder = new ViewHolder();
// get the textview's from the convertView
holder.textLong = (TextView) convertView.findViewById(R.id.long_name);
holder.textShort = (TextView) convertView.findViewById(R.id.short_name);
// store it in a Tag as its the first time this view is generated
convertView.setTag(holder);
} else {
/* get the View from the existing Tag */
holder = (ViewHolder) convertView.getTag();
}
/* update the textView's text and color of list item */
holder.textLong.setText((CharSequence) itemList.get(position).get(TAG_NAME));
holder.textShort.setText((CharSequence) itemList.get(position).get(TAG_SHORT));
holder.textShort.setTextColor((Integer) itemList.get(position).get(TAG_COLOR));
return convertView;
}
}
活动类 ---＆gt;的 MainActivity.java
public class MainActivity extends Activity {
private static final String TAG_NAME = "shop_name";
private static final String TAG_SHORT = "shop_address";
private static final String TAG_COLOR = "color";
private List<Map<String, Object>> itemList = new ArrayList<Map<String, Object>>();
private Map<String, Object> map;
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list_view);
//Sample data insertion into the list
map = new LinkedHashMap<String, Object>();
map.put(TAG_NAME, "textview11");
map.put(TAG_SHORT, "textview12");
map.put(TAG_COLOR, Color.BLUE);
itemList.add(map);
map = new LinkedHashMap<String, Object>();
map.put(TAG_NAME, "textview21");
map.put(TAG_SHORT, "textview22");
map.put(TAG_COLOR, Color.GREEN);
itemList.add(map);
map = new LinkedHashMap<String, Object>();
map.put(TAG_NAME, "textview31");
map.put(TAG_SHORT, "textview32");
map.put(TAG_COLOR, Color.RED);
itemList.add(map);
/* create an adapter for listview*/
SimpleAdapter adapter = new CustomSimpleAdapter(this, itemList,
R.layout.listview_routes_row, new String[] { TAG_NAME, TAG_SHORT }, new
int[] { R.id.long_name, R.id.short_name });
listView.setAdapter(adapter);
}
}
我认为它会对你有所帮助。如果您有任何问题，请告诉我。
答案 1 :(得分：2)
要为每个项目创建自定义视图，您必须创建自己的适配器而不是使用默认适配器，但这很简单：
public class CustomAdapter extends SimpleAdapter {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
Object item = getItem(position);
TextView text = v.findViewById(//your text view id);
ColorStateList color = //get color for item;
text.setTextColor(color);
return v;
}
}
答案 2 :(得分：-1)
你可以试试这个：textview.setTextColor（color）;