单个微调器多个活动

Question

我试图使用单个微调器来满足多个要求。我可以通过禁用每个适配器来满足这两个要求。 我已经尝试了很多天，谷歌搜索但失败了。

要求1. Spinner1根据edittext更改2.我应该能够单击Spinner1并查看项目。

请帮助我你的专业知识。 我的编纂。

 package edu.orangecoastcollege.cs273.occcoursefinder; import android.database.Cursor; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.Spinner; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class CourseSearchActivity extends AppCompatActivity { private DBHelper db; private List < Course > allCoursesList; private List < Offering > allOfferingsList; private List < Offering > filteredOfferingsList; private EditText courseTitleEditText; private Spinner ok; private ListView offeringsListView; private OfferingListAdapter offeringListAdapter; private InstructorSpinnerAdapter instructorSpinnerAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_course_search); deleteDatabase(DBHelper.DATABASE_NAME); db = new DBHelper(this); db.importCoursesFromCSV("courses.csv"); db.importOfferingsFromCSV("offerings.csv"); allOfferingsList = db.getAllOfferings(); filteredOfferingsList = new ArrayList < > (allOfferingsList); allCoursesList = db.getAllCourses(); courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText); courseTitleEditText.addTextChangedListener(courseTitleTextWatcher); ok = (Spinner) findViewById(R.id.ok); // offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList); offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList); ok.setAdapter(offeringListAdapter); instructorSpinnerAdapter = new InstructorSpinnerAdapter(this, R.layout.offering_list_item, filteredOfferingsList); ArrayAdapter < String > instructorSpinnerAdapter = new ArrayAdapter < String > (this, android.R.layout.simple_spinner_item, getAllCourse()); ok.setAdapter(instructorSpinnerAdapter); // ok.setOnItemSelectedListener(instructorSpinnerListener); } private String[] getAllCourse() { String[] instructorNames = new String[allCoursesList.size() + 1]; instructorNames[0] = "[Select Course]"; for (int i = 1; i < instructorNames.length; i++) { instructorNames[i] = allCoursesList.get(i - 1).getTitle(); } return instructorNames; } public TextWatcher courseTitleTextWatcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { String input = charSequence.toString().toLowerCase(); if (input.equals("")) { } else { String name = ok.getSelectedItem().toString(); //Toast.makeText(CourseSearchActivity.this, name, Toast.LENGTH_SHORT).show(); offeringListAdapter.clear(); for (Offering offering: allOfferingsList) { // If the course title starts with the user input, // add it to the listAdapter Course course = offering.getCourse(); if (course.getTitle().toLowerCase().contains(input)) offeringListAdapter.add(offering); } } } @Override public void afterTextChanged(Editable editable) { } }; public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView << ? > adapterView, View view, int i, long l) { String selectedInstructorName = adapterView.getItemAtPosition(i).toString(); if (selectedInstructorName.equals("[Select Instructor]")) { instructorSpinnerAdapter.clear(); for (Offering offering: allOfferingsList) instructorSpinnerAdapter.add(offering); } else { instructorSpinnerAdapter.clear(); } } @Override public void onNothingSelected(AdapterView << ? > adapterView) { adapterView.setSelection(0); Toast.makeText(getApplicationContext(), "Why?", Toast.LENGTH_SHORT).show(); } }; public void reset(View view) { courseTitleEditText.setText(""); ok.setSelection(0); } } 

找到我的要求以下

修改后的代码

 public TextWatcher courseTitleTextWatcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int o, int i1, int i2) { String input = charSequence.toString().toLowerCase(); if (input.equals("")) { } else { String name = ok.getSelectedItem().toString(); //Toast.makeText(CourseSearchActivity.this, name, Toast.LENGTH_SHORT).show(); offeringListAdapter.clear(); Offering offering; for (int i = 0; i < allOfferingsList.size(); i++) { // If the course title starts with the user input, // add it to the listAdapter offering = allOfferingsList.get(i); Course course = offering.getCourse(); if (course.getTitle().toLowerCase().contains(input)) { offeringListAdapter.add(offering); offeringListAdapter.notifyDataSetChanged(); ok.setSelection(i); } } offeringListAdapter.notifyDataSetChanged(); //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ } } @Override public void afterTextChanged(Editable editable) { } }; 

修改代码的错误

 Process: edu.orangecoastcollege.cs273.occcoursefinder, PID: 16548 java.lang.ArrayIndexOutOfBoundsException: length = 16; index = 21 at java.util.Arrays$ArrayList.get(Arrays.java: 3854) at android.widget.ArrayAdapter.getItem(ArrayAdapter.java: 349) at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java: 405) at android.widget.ArrayAdapter.getView(ArrayAdapter.java: 371) at android.widget.Spinner.makeView(Spinner.java: 702) at android.widget.Spinner.layout(Spinner.java: 650) at android.widget.Spinner.onLayout(Spinner.java: 612) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.widget.LinearLayout.setChildFrame(LinearLayout.java: 1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java: 1585) at android.widget.LinearLayout.onLayout(LinearLayout.java: 1494) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.widget.FrameLayout.layoutChildren(FrameLayout.java: 323) at android.widget.FrameLayout.onLayout(FrameLayout.java: 261) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java: 433) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.widget.FrameLayout.layoutChildren(FrameLayout.java: 323) at android.widget.FrameLayout.onLayout(FrameLayout.java: 261) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.widget.LinearLayout.setChildFrame(LinearLayout.java: 1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java: 1585) at android.widget.LinearLayout.onLayout(LinearLayout.java: 1494) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.widget.FrameLayout.layoutChildren(FrameLayout.java: 323) at android.widget.FrameLayout.onLayout(FrameLayout.java: 261) at com.android.internal.policy.DecorView.onLayout(DecorView.java: 726) at android.view.View.layout(View.java: 17637) at android.view.ViewGroup.layout(ViewGroup.java: 5575) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java: 2346) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java: 2068) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java: 1254) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java: 6337) at android.view.Choreographer$CallbackRecord.run(Choreographer.java: 874) at android.view.Choreographer.doCallbacks(Choreographer.java: 686) at android.view.Choreographer.doFrame(Choreographer.java: 621) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java: 860) at android.os.Handler.handleCallback(Handler.java: 751) at android.os.Handler.dispatchMessage(Handler.java: 95) at android.os.Looper.loop(Looper.java: 154) at android.app.ActivityThread.main(ActivityThread.java: 6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: 886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java: 776) 

Answer 1

 private ArrayList < String > getAllCourse() { ArrayList < String > instructorNames = new ArrayList < > (); instructorNames.add("[Select Course]"); for (int i = 0; i < allCoursesList.size(); i++) { instructorNames.add(allCoursesList.get(i).getTitle()); } return instructorNames; } public TextWatcher courseTitleTextWatcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { String input = charSequence.toString().toLowerCase(); ArrayAdapter adapter = (ArrayAdapter) ok.getAdapter(); adapter.clear(); if (input.equals("")) { adapter.addAll(getAllCourse()); } else { Course course; for (int j = 0; j < allCoursesList.size(); j++) { // If the course title starts with the user input, // add it to the listAdapter course = allCoursesList.get(j); if (course.getTitle().toLowerCase().startsWith(input)) { adapter.add(course.getTitle()); } } } adapter.notifyDataSetChanged(); if (adapter.getCount() != 0) ok.setSelection(0); } @Override public void afterTextChanged(Editable editable) { } };