我这里有个问题。我制作了一个应用程序，从 android 搜索数据，所有数据都保存在我的服务器上。问题是当我想按名称搜索数据时，它只是出现错误。有人可以帮帮我吗？这是我的代码。如果有任何错误我的代码，请修复它。
public class MainActivity extends ListActivity {
private ProgressDialog mProgressDialog;
JSONParser jsonParser = new JSONParser();
ArrayList<HashMap<String, String>> personlist;
JSONArray person = null;
private static final String TAG_SUCCESS = "success";
private static final String TAG_PERSON = "T_Person";
private static final String TAG_PID = "ID_Person";
private static final String TAG_NAME = "First_Name_Person";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
personlist = new ArrayList<HashMap<String,String>>();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
SearchManager searchmanager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchview = (SearchView) menu.findItem(R.id.search).getActionView();
searchview.setSearchableInfo(searchmanager.getSearchableInfo(getComponentName()));
searchview.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
// TODO Auto-generated method stub
new LoadAllPerson().execute();
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
// TODO Auto-generated method stub
return false;
}
});
return true;
}
private class LoadAllPerson extends AsyncTask<String, String, String>{
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog = new ProgressDialog(MainActivity.this);
mProgressDialog.setTitle("Please Wait");
mProgressDialog.setMessage("Hold");
mProgressDialog.setIndeterminate(false);
mProgressDialog.show();
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
List<NameValuePair>param = new ArrayList<NameValuePair>();
String url_all_person = "http://172.18.0.20/search_exe.php?First_Name_Person="+TAG_NAME;
JSONObject json = jsonParser.makeHttpRequest(url_all_person, "GET", param);
Log.d("All Person: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
person = json.getJSONArray(TAG_PERSON);
for (int i = 0; i < person.length(); i++) {
JSONObject c = person.getJSONObject(i);
String id = c.getString(TAG_PID);
String firstname = c.getString(TAG_NAME);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_PID, id);
map.put(TAG_NAME, firstname);
personlist.add(map);
}
} else {
}
} catch (JSONException e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
mProgressDialog.dismiss();
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
ListAdapter adapter = new SimpleAdapter(MainActivity.this,personlist,R.layout.singledetail,new String[]
{ TAG_PID,TAG_NAME},
new int[] { R.id.textID, R.id.firstname });
setListAdapter(adapter);
}
});
}
}
}
我的logcat是这样的：
11-11 02:40:09.921: E/JSON Parser(1156): Error parsing data org.json.JSONException: End of input at character 0 of
11-11 02:40:10.282: E/AndroidRuntime(1156): FATAL EXCEPTION: AsyncTask #1
11-11 02:40:10.282: E/AndroidRuntime(1156): java.lang.RuntimeException: An error occured while executing doInBackground()
11-11 02:40:10.282: E/AndroidRuntime(1156): at android.os.AsyncTask$3.done(AsyncTask.java:299)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
11-11 02:40:10.282: E/AndroidRuntime(1156): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.lang.Thread.run(Thread.java:856)
11-11 02:40:10.282: E/AndroidRuntime(1156): Caused by: java.lang.NullPointerException
11-11 02:40:10.282: E/AndroidRuntime(1156): at com.sd.search.MainActivity$LoadAllPerson.doInBackground(MainActivity.java:89)
11-11 02:40:10.282: E/AndroidRuntime(1156): at com.sd.search.MainActivity$LoadAllPerson.doInBackground(MainActivity.java:1)
11-11 02:40:10.282: E/AndroidRuntime(1156): at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-11 02:40:10.282: E/AndroidRuntime(1156): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
11-11 02:40:10.282: E/AndroidRuntime(1156): ... 4 more
11-11 02:40:15.952: E/WindowManager(1156): Activity com.sd.search.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d68308 V.E..... R.....ID 0,0-320,162} that was originally added here
11-11 02:40:15.952: E/WindowManager(1156): android.view.WindowLeaked: Activity com.sd.search.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d68308 V.E..... R.....ID 0,0-320,162} that was originally added here
11-11 02:40:15.952: E/WindowManager(1156): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
11-11 02:40:15.952: E/WindowManager(1156): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
11-11 02:40:15.952: E/WindowManager(1156): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
11-11 02:40:15.952: E/WindowManager(1156): at android.app.Dialog.show(Dialog.java:281)
11-11 02:40:15.952: E/WindowManager(1156): at com.sd.search.MainActivity$LoadAllPerson.onPreExecute(MainActivity.java:79)
11-11 02:40:15.952: E/WindowManager(1156): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
11-11 02:40:15.952: E/WindowManager(1156): at android.os.AsyncTask.execute(AsyncTask.java:534)
11-11 02:40:15.952: E/WindowManager(1156): at com.sd.search.MainActivity$1.onQueryTextSubmit(MainActivity.java:58)
11-11 02:40:15.952: E/WindowManager(1156): at android.widget.SearchView.onSubmitQuery(SearchView.java:1161)
11-11 02:40:15.952: E/WindowManager(1156): at android.widget.SearchView.access$900(SearchView.java:92)
11-11 02:40:15.952: E/WindowManager(1156): at android.widget.SearchView$8.onEditorAction(SearchView.java:1139)
11-11 02:40:15.952: E/WindowManager(1156): at android.widget.TextView.onEditorAction(TextView.java:4117)
11-11 02:40:15.952: E/WindowManager(1156): at com.android.internal.widget.EditableInputConnection.performEditorAction(EditableInputConnection.java:138)
11-11 02:40:15.952: E/WindowManager(1156): at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:297)
11-11 02:40:15.952: E/WindowManager(1156): at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
11-11 02:40:15.952: E/WindowManager(1156): at android.os.Handler.dispatchMessage(Handler.java:99)
11-11 02:40:15.952: E/WindowManager(1156): at android.os.Looper.loop(Looper.java:137)
11-11 02:40:15.952: E/WindowManager(1156): at android.app.ActivityThread.main(ActivityThread.java:5041)
11-11 02:40:15.952: E/WindowManager(1156): at java.lang.reflect.Method.invokeNative(Native Method)
11-11 02:40:15.952: E/WindowManager(1156): at java.lang.reflect.Method.invoke(Method.java:511)
11-11 02:40:15.952: E/WindowManager(1156): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
11-11 02:40:15.952: E/WindowManager(1156): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
11-11 02:40:15.952: E/WindowManager(1156): at dalvik.system.NativeStart.main(Native Method)
如果代码成功，所有数据显示为列表视图。请帮我。谢谢