我有一个片段，我正在获取用户输入，然后将输入传递给另一个方法，我使用EditText来获取用户的输入。我试图在线寻找解决方案，但似乎没有合适的答案来解决这个错误。
void android.widget.EditText.addTextChangedListener（android.text.TextWatcher）
片段
public class FragmentSearch extends Fragment implements SearchMovieListener, SortListener {
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
private static EditText mInputText;
private Button searchButton;
private VolleySingleton volleySingleton;
private ImageLoader imageLoader;
private RequestQueue requestQueue;
private ArrayList<Movie> mlistMovies = new ArrayList<>();
private DateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd");
private RecyclerView listMovieHits;
private AdapterBoxOffice mAdapterBoxOffice;
private TextView textVolleyError;
private MovieSorter movieSorter;
private static final String STATE_MOVIES = "state_movies";
// Search intialization
Toolbar mToolbarF;
public FragmentSearch() {
// Required empty public constructor
movieSorter = new MovieSorter();
}
public static FragmentSearch newInstance(String param1, String param2) {
FragmentSearch fragment = new FragmentSearch();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
volleySingleton = VolleySingleton.getsInstance();
requestQueue = volleySingleton.getmRequestQueue();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layoutSearch = inflater.inflate(R.layout.fragment_search, container, false);
mInputText = (EditText) layoutSearch.findViewById(R.id.edt_tool_search);
ImageView mImageView= (ImageView) layoutSearch.findViewById(R.id.img_tool_mic);
textVolleyError = (TextView) layoutSearch.findViewById(R.id.textVolleyError);
listMovieHits = (RecyclerView) layoutSearch.findViewById(R.id.search_movies);
listMovieHits.setLayoutManager(new LinearLayoutManager(getActivity()));
mAdapterBoxOffice = new AdapterBoxOffice(getActivity());
listMovieHits.setAdapter(mAdapterBoxOffice);
if (savedInstanceState != null) {
mlistMovies = savedInstanceState.getParcelableArrayList(STATE_MOVIES);
} else {
L.t(getActivity(), "executing task from the fragment");
new TaskLoadSearchMovies(this).execute();
}
mAdapterBoxOffice.setMovieList(mlistMovies);
return layoutSearch;
}
public static String searchMovies() {
mInputText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
/*L.E("I searched", mInputText.getText().toString());*/
/*L.t( ge, mInputText.getText().toString());*/
}
});
return mInputText.getText().toString();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
//save the movie list to a parcelable prior to rotation or configuration change
outState.putParcelableArrayList(STATE_MOVIES, mlistMovies);
}
// Search <code></code>
@Override
public void onSortByName() {
L.t(getActivity(), ("Sort name was clicked"));
movieSorter.sortMovieByName(mlistMovies);
mAdapterBoxOffice.notifyDataSetChanged();
}
@Override
public void onSortByDate() {
movieSorter.sortMoviesByDate(mlistMovies);
mAdapterBoxOffice.notifyDataSetChanged();
}
@Override
public void onSortByRatings() {
movieSorter.sortMoviesByRating(mlistMovies);
mAdapterBoxOffice.notifyDataSetChanged();
}
@Override
public void onSearchMoviesLoaded(ArrayList<Movie> listMovies) {
mAdapterBoxOffice.setMovieList(listMovies);
}
}
logcat的
01-18 20:25:23.334 18697-18697/? I/art: Not late-enabling -Xcheck:jni (already on)
01-18 20:25:23.419 18697-18697/? W/System: ClassLoader referenced unknown path: /data/app/comeagain.materialdesign-2/lib/x86
01-18 20:25:23.931 18697-18697/comeagain.materialdesign I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead.
01-18 20:25:24.000 18697-18697/comeagain.materialdesign D/Dominic: onInterceptTouchEvent
01-18 20:25:24.249 18697-18733/comeagain.materialdesign D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
01-18 20:25:24.316 18697-18697/comeagain.materialdesign D/VIVZ: loading entries 36Mon Jan 18 20:25:24 GMT+03:00 2016
01-18 20:25:24.319 18697-18697/comeagain.materialdesign D/VIVZ: loading entries 11Mon Jan 18 20:25:24 GMT+03:00 2016
01-18 20:25:24.383 18697-18733/comeagain.materialdesign I/OpenGLRenderer: Initialized EGL, version 1.4
01-18 20:25:24.438 18697-18733/comeagain.materialdesign W/EGL_emulation: eglSurfaceAttrib not implemented
01-18 20:25:24.438 18697-18733/comeagain.materialdesign W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xabebec20, error=EGL_SUCCESS
01-18 20:25:24.525 18697-18697/comeagain.materialdesign W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{fb99aa9 V.ED..... ......ID 0,0-0,0 #7f0b009f app:id/selector} during layout: running second layout pass
01-18 20:25:24.525 18697-18697/comeagain.materialdesign W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{6dc882e V.ED..... ......I. 0,0-0,0 #7f0b009f app:id/selector} during layout: running second layout pass
01-18 20:25:24.525 18697-18697/comeagain.materialdesign W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{ef82fcf V.ED..... ......I. 0,0-0,0 #7f0b009f app:id/selector} during layout: running second layout pass
01-18 20:26:26.147 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.130ms
01-18 20:28:55.330 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.190ms
01-18 20:30:44.083 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 6.154ms
01-18 20:31:30.197 18697-23852/comeagain.materialdesign E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: comeagain.materialdesign, PID: 18697
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.EditText.addTextChangedListener(android.text.TextWatcher)' on a null object reference
at comeagain.materialdesign.fragments.FragmentSearch.searchMovies(FragmentSearch.java:151)
at comeagain.materialdesign.json.Endpoints.getRequestUrlSearchMovies(Endpoints.java:40)
at comeagain.materialdesign.extras.MovieUtils.loadSearchMovies(MovieUtils.java:33)
at comeagain.materialdesign.task.TaskLoadSearchMovies.doInBackground(TaskLoadSearchMovies.java:30)
at comeagain.materialdesign.task.TaskLoadSearchMovies.doInBackground(TaskLoadSearchMovies.java:17)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
01-18 20:31:30.467 18697-18733/comeagain.materialdesign W/EGL_emulation: eglSurfaceAttrib not implemented
01-18 20:31:30.467 18697-18733/comeagain.materialdesign W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xad72c640, error=EGL_SUCCESS
01-18 20:31:30.663 18697-18733/comeagain.materialdesign E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb40162f0
01-18 20:31:32.206 18697-18733/comeagain.materialdesign E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb40172b0
01-18 20:32:34.724 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.065ms
01-18 20:34:29.454 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 24.052ms
01-18 20:34:41.965 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.668ms
01-18 20:35:16.054 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.501ms
01-18 20:36:03.117 18697-18703/comeagain.materialdesign W/art: Suspending all threads took: 5.564ms
01-18 20:36:30.316 18697-23852/? I/Process: Sending signal. PID: 18697 SIG: 9
我想为什么我会收到此错误以及如何解决？