我正在创建一个应用程序，从JSON获取数据，我被困在一个部分：当我尝试将我的图像从字符串读取到ImageView时，我收到错误：
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #2
Process: , PID: 9535
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:304)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.RuntimeException: No resource ID found for: i_coal / class android.graphics.drawable.Drawable
at com.infonuascape.osrshelper.fragments.BankViewFragment.getResId(BankViewFragment.java:69)
at com.infonuascape.osrshelper.fragments.BankViewFragment$GetItems.doInBackground(BankViewFragment.java:100)
at com.infonuascape.osrshelper.fragments.BankViewFragment$GetItems.doInBackground(BankViewFragment.java:74)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NoSuchFieldException: i_coal
at java.lang.Class.getDeclaredField(Class.java:890)
at .fragments.BankViewFragment.getResId(BankViewFragment.java:66)
at .fragments.BankViewFragment$GetItems.doInBackground(BankViewFragment.java:100)
at .fragments.BankViewFragment$GetItems.doInBackground(BankViewFragment.java:74)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
我该如何解决？如果我尝试使用R.Drawable.i_coal，则该资源存在; 另外，如何检查资源是否存在以跳过它而不是抛出错误？
BankViewFragment：
import android.content.Context;
public class BankViewFragment {
private static final String TAG = "BankViewFragment";
private static Account account;
private ListView lv;
private ImageView iv;
ArrayList<HashMap<String, String>> ItemList;
public static BankViewFragment newInstance(final Account account) {
BankViewFragment fragment = new BankViewFragment();
Bundle b = new Bundle();
fragment.setArguments(b);
return fragment;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.bank_view, null);
ItemList = new ArrayList<>();
new GetItems().execute();
lv = (ListView) view.findViewById(R.id.list);
iv = (ImageView) view.findViewById(R.id.logo);
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
String nikas = sharedPref.getString("bankname", "null");
return view;
}
public static int getResId(String resourceName, Class<?> c) {
try {
Field idField = c.getDeclaredField(resourceName);
return idField.getInt(idField);
} catch (Exception e) {
throw new RuntimeException("No resource ID found for: "
+ resourceName + " / " + c, e);
}
}
private class GetItems extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
SharedPreferences sharedpreferences = getContext().getSharedPreferences("minescape", Context.MODE_PRIVATE);
String nikas = sharedpreferences.getString("bankname", "null");
String url = "https://api.minesca.pe/game/classic/stats?username=" + nikas;
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "NIKAS: " + nikas);
Log.e(TAG, "ACCOUNT: " + account);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
JSONObject items = jsonObj.getJSONObject("bank");
Iterator keys = items.keys();
while(keys.hasNext()) {
String dynamicKey = (String)keys.next();
JSONObject line = items.getJSONObject(dynamicKey);
String item = line.getString("item");
Integer image = getResId(item, Drawable.class);
String amount = line.getString("amount");
Log.e(TAG, "DAIGTAS: " + item);
Log.e(TAG, "KIEKIS: " + amount);
HashMap<String, String> contact = new HashMap<>();
String itembank = item.replaceAll("i_", "");
String itembanks = itembank.replaceAll("_", " ");
contact.put("name", itembanks);
contact.put("email", amount);
ImageView ims = (ImageView) lv.findViewById(R.id.logo);
lv.setBackgroundResource(getResId(item, Drawable.class));
ItemList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
new Runnable() {
@Override
public void run() {
Toast.makeText(getContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
};
}
} else {
Log.e(TAG, "Couldn't get json from server.");
new Runnable() {
@Override
public void run() {
Toast.makeText(getContext(),
"Couldn't get json from server!",
Toast.LENGTH_LONG).show();
}
};
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
ListAdapter adapter = new SimpleAdapter(getContext(), ItemList,
R.layout.list_item, new String[]{ "email","name"},
new int[]{R.id.email, R.id.name});
lv.setAdapter(adapter);
}
}
}
list_item.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="@dimen/activity_horizontal_margin">
<ImageView
android:id="@+id/logo"
android:layout_height="match_parent"
android:layout_weight="1"
app:srcCompat="@android:drawable/btn_star"
android:layout_width="0dp" />
<TextView
android:id="@+id/name"
android:layout_width="219dp"
android:layout_height="wrap_content"
android:paddingBottom="2dip"
android:paddingTop="6dip"
android:textColor="@color/black"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="@+id/email"
android:layout_width="83dp"
android:layout_height="match_parent"
android:paddingBottom="2dip"
android:textColor="@color/black" />
</LinearLayout>
答案 0 :(得分：0)
试试这个
context.getResources().getIdentifier(String name, String defType, String defPackage)