我已经编写了一些代码来将数据从网页设置为listview。我已成功阅读网页，并在String数组中存储了必要的数据。现在我想使用ListView将其分配给ArrayAdapter，但数据未在listview中设置。请帮我解决错误：
完整日志CAT
11-07 23:41:40.150: E/AndroidRuntime(3400): FATAL EXCEPTION: main
11-07 23:41:40.150: E/AndroidRuntime(3400): java.lang.UnsupportedOperationException
11-07 23:41:40.150: E/AndroidRuntime(3400): at java.util.AbstractList.add(AbstractList.java:411)
11-07 23:41:40.150: E/AndroidRuntime(3400): at java.util.AbstractList.add(AbstractList.java:432)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.widget.ArrayAdapter.add(ArrayAdapter.java:178)
11-07 23:41:40.150: E/AndroidRuntime(3400): at com.air.test.Smscollection$sendMessageAsync.onPostExecute(Smscollection.java:91)
11-07 23:41:40.150: E/AndroidRuntime(3400): at com.air.test.Smscollection$sendMessageAsync.onPostExecute(Smscollection.java:1)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask.finish(AsyncTask.java:417)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask.access$300(AsyncTask.java:127)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.Handler.dispatchMessage(Handler.java:99)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.Looper.loop(Looper.java:130)
11-07 23:41:40.150: E/AndroidRuntime(3400): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-07 23:41:40.150: E/AndroidRuntime(3400): at java.lang.reflect.Method.invokeNative(Native Method)
11-07 23:41:40.150: E/AndroidRuntime(3400): at java.lang.reflect.Method.invoke(Method.java:507)
11-07 23:41:40.150: E/AndroidRuntime(3400): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-07 23:41:40.150: E/AndroidRuntime(3400): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-07 23:41:40.150: E/AndroidRuntime(3400): at dalvik.system.NativeStart.main(Native Method)
输出logcat以验证数据是否存储在String array
11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies
11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly
11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfies
11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly
11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies
11-07 23:03:47.640: I/VALUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies<br/>Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly<br/>Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfies<br/>Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly<br/>Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies
CODE
public class Smscollection extends Activity {
private Spinner spinner1;
private ProgressDialog pd;
private StringBuilder response;
private ListView listView;
private String[] values = new String[0];
private ArrayAdapter<String> adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_smscollection);
listView = (ListView) findViewById(R.id.mylist);
spinner1 = (Spinner) findViewById(R.id.spinnerCategory);
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> av, View view, int id,
long ids) {
new sendMessageAsync().execute();
}
public void onNothingSelected(AdapterView<?> av) {
}
});
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_smscollection, menu);
return true;
}
private class sendMessageAsync extends AsyncTask<Void, Void, String> {
@Override
protected void onPreExecute() {
pd = ProgressDialog.show(Smscollection.this, null, "Loading...",
true, true);
}
@Override
protected void onCancelled() {
Toast.makeText(getApplicationContext(),
"Message Sending Cancelled", Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(Void... arg0) {
try {
return doInBg();
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
pd.dismiss();
if (result == null) {
// request failed!
// return;
}
values = String.valueOf(result).split("<br/>");
adapter.clear();
for (String str : values) {
adapter.add(str);
}
adapter.notifyDataSetChanged();
listView.setAdapter(adapter);
}
}
public String doInBg() {
String responseRes = null;
try {
final String msgURL = "http://freesmsit.tk/msg/messages.php?category="
+ String.valueOf(spinner1.getSelectedItem().toString()
.replace(" ", "%20"));
URLConnection connection = new URL(msgURL).openConnection();
connection.setRequestProperty("Accept-Charset", "UTF-8");
InputStream responseStream = connection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(responseStream));
response = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
response.append(line);
}
responseRes = response.toString();
} catch (Exception ex) {
ex.printStackTrace();
}
return responseRes;
}
}
答案 0 :(得分：4)
如果您使用array作为ArrayAdapter的数据，该数组将转换为特殊的ArrayList（不是平台中的正常数组），但尚未实现add和remove方法（您只能修改该列表中已存在的项目）。因此，当您尝试使用方法add向适配器添加项目时，应用程序将失败，并显示您看到的异常。
解决方案是将values中使用的ArrayAdapter数组替换为List，例如ArrayList（正常的）。
private ArrayList<String> values = new ArrayList<String>();
然后修改其余代码以使用列表而不是数组。
答案 1 :(得分：0)
这应该有效：
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, values);
listView.setAdapter(adapter);
答案 2 :(得分：0)
您正在使用适配器非通用数组 - String []
涉及通用List接口方法（add，remove，clear）的适配器上的任何操作都将失败**
private String[] values = new String[0];
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
这样：
解决方案1：
在代码中使用Arrays.asList（[]）：
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, Arrays.asList(values));
解决方案2：
使用新数组初始化（构造函数）：
List<String> valuesAsArray = newArrayList<String>(values);
解决方案3：
声明你的＆＃34;值变量＆＃34;作为变量实现List接口
List<String> values = new ArrayList<>();