Question

我的textwatcher在Android Studio中给出了不正确的输出。任何人都可以建议我解决这个问题的解决方法。

需求量的。＆＃34;如果课程标题以edittext中的用户输入开头，则其显示在微调器（数据库中的数据）＆＃34;

注意：我使用单个微调器用于多种用途1.选择微调器跟踪2.根据edittext用户输入显示微调器值

我的编纂。

＆＃13;

package com.bar.example.myapplication;


import android.database.Cursor;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;


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 selectedInstructorName selectedInstructorName;
  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.spinner1);



    // 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();
        instructorSpinnerAdapter.clear();
        Offering offering;
        for (int j = 0; j < allOfferingsList.size(); j++) {
          // If the course title starts with the user input,
          // add it to the listAdapter
          offering = allOfferingsList.get(j);
          Course course = offering.getCourse();
          if (course.getTitle().toLowerCase().contains(input)) {
            instructorSpinnerAdapter.add(offering);
            instructorSpinnerAdapter.notifyDataSetChanged();
            ok.setSelection(instructorSpinnerAdapter.getCount() - 1);
          }
        }
      }
    }

    @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);
  }


}

＆＃13;

根据建议

＆＃13;

@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();
    instructorSpinnerAdapter.clear();
    Offering offering;
    for (int j = 0; j < allOfferingsList.size(); j++) {
      // If the course title starts with the user input,
      // add it to the listAdapter
      offering = allOfferingsList.get(j);
      Course course = offering.getCourse();
      if (course.getTitle().toLowerCase().contains(input)) {
        if (course.getTitle().toLowerCase().startsWith(input))
          instructorSpinnerAdapter.add(offering);
        instructorSpinnerAdapter.notifyDataSetChanged();
        ok.setSelection(instructorSpinnerAdapter.getCount() - 1);
      }
    }
  }
}

＆＃13;

错误

＆＃13;

04-26 10:35:46.394 31756-31756/com.bar.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.bar.example.myapplication, PID: 31756
    java.lang.UnsupportedOperationException
        at java.util.AbstractList.remove(AbstractList.java:161)
        at java.util.AbstractList$Itr.remove(AbstractList.java:374)
        at java.util.AbstractList.removeRange(AbstractList.java:571)
        at java.util.AbstractList.clear(AbstractList.java:234)
        at android.widget.ArrayAdapter.clear(ArrayAdapter.java:285)
        at com.bar.example.myapplication.CourseSearchActivity$1.onTextChanged(CourseSearchActivity.java:95)
        at android.widget.TextView.sendOnTextChanged(TextView.java:8187)
        at android.widget.TextView.handleTextChanged(TextView.java:8249)
        at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:10371)
        at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1208)
        at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:578)
        at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:509)
        at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:508)
        at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:844)
        at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:617)
        at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:408)
        at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:93)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

＆＃13;

目前的观点是..

而不是这个我需要输入数据库x和spinner应该y屏幕跟随

我的数据库如下。

我正在尝试获得单输入和多输出。屏幕示例

修订后的代码

＆＃13;

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();
    ArrayAdapter adapter1 = (ArrayAdapter) ok1.getAdapter();
    adapter.clear();
    adapter1.clear();
    if (input.equals("")) {
      adapter.addAll(getAllCourse());
      adapter1.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.getAlpha().toLowerCase().startsWith(input) || course.getNumber().toLowerCase().startsWith(input)) {
          adapter.add(course.getTitle());
          adapter1.add(course.getNumber());
        }
      }
    }
    adapter.notifyDataSetChanged();
    if (adapter.getCount() != 0) ok.setSelection(0);
    if (adapter1.getCount() != 0) ok1.setSelection(0);
  }
  @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();
  }
};

＆＃13;

@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");
  Button reset = (Button) findViewById(R.id.resetButton);
  allOfferingsList = db.getAllOfferings();
  filteredOfferingsList = new ArrayList < > (allOfferingsList);

  allCoursesList = db.getAllCourses();

  courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText);
  courseTitleEditText.addTextChangedListener(courseTitleTextWatcher);

  ok = (Spinner) findViewById(R.id.spinner1);
  ok1 = (Spinner) findViewById(R.id.spinner2);

  // 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);
  ok1.setAdapter(instructorSpinnerAdapter);
  ok.setOnItemSelectedListener(instructorSpinnerListener);

  ok1.setOnItemSelectedListener(instructorSpinnerListener);
}

＆＃13;

它有效，但有些时候没有。你可以检查并建议......

错误...附

另一个条件：

根据附加的微调器截图选择spinner2选择。如何交换相同。请指教。

Answer 1

请尝试以下代码：

在搜索时在微调器中搜索以下输出时使用新代码

@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.add(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);
}

更改getAllCourse（）以使用ArrayList而不是String []。

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;
}

现在搜索好了。但是微调器选择不起作用....附加截图..

Answer 2

尝试以下代码：

@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");
    Button reset = (Button) findViewById(R.id.resetButton);
    allOfferingsList = db.getAllOfferings();
    filteredOfferingsList = new ArrayList <> (allOfferingsList);

    allCoursesList = db.getAllCourses();

    courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText);
    courseTitleEditText.addTextChangedListener(courseTitleTextWatcher);

    ok = (Spinner) findViewById(R.id.spinner1);
    ok1 = (Spinner) findViewById(R.id.spinner2);

    // offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
    // ok.setAdapter(offeringListAdapter);
    instructorSpinnerAdapter = new InstructorSpinnerAdapter(this, R.layout.offering_list_item, filteredOfferingsList);

    // The two spinners need to have different adapters as they will use different datasets.
    ok.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, getAllCourse()));
    ok1.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, getAllCourseNumber()));
    // The two spinner can have same listener.
    ok.setOnItemSelectedListener(instructorSpinnerListener);
    ok1.setOnItemSelectedListener(instructorSpinnerListener);
}

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;
}

private ArrayList<String> getAllCourseNumber() {
    ArrayList<String> instructorNames = new ArrayList<>();
    instructorNames.add("[Select Course]");
    for (int i = 0; i < allCoursesList.size(); i++) {
        instructorNames.add(allCoursesList.get(i).getNumber());
    }
    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();
        // Toast.makeText(getApplicationContext(), input, Toast.LENGTH_LONG).show();
        ArrayAdapter adapter = (ArrayAdapter) ok.getAdapter();
        ArrayAdapter adapter1 = (ArrayAdapter) ok1.getAdapter();
        adapter.clear();
        adapter1.clear();
        if (input.equals("")) {
            adapter.addAll(getAllCourse());
            adapter1.addAll(getAllCourseNumber());
        } else {
            Course course;
            for (int j=0; j < allCoursesList.size(); j++) {
                // If the course alpha/number starts with the user input,
                // add it to the listAdapter
                course = allCoursesList.get(j);
                if (course.getAlpha().toLowerCase().startsWith(input) || course.getNumber().toLowerCase().startsWith(input)) {
                    adapter.add(course.getTitle());
                    adapter1.add(course.getNumber());
                }
            }
        }
        adapter.notifyDataSetChanged();
        adapter1.notifyDataSetChanged();
        if (adapter.getCount() != 0) ok.setSelection(0);
        if (adapter1.getCount() != 0) ok1.setSelection(0);
    }
    @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();

        // No matter which spinner is selected, get item from the ok [Title] spinner.
        String selectedInstructorName = ok.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();
    }
};

我不确定为什么在TextWatcher中使用getAlpha（），因为你显示alpha总是CS。如果代码不起作用，那么在getAllCourseNumber（）中将 allCoursesList.get（i）.getNumber（）更改为 allCoursesList.get（i）.getAlpha（），所以我们可以有一个alpha列表供检查。

希望有所帮助！

更新了OnItemSelectedListener：

    public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        // Sync the selection of the two spinners.
        if(adapterView.getId() == R.id.spinner1){
            ok1.setOnItemSelectedListener(null);
            ok1.setSelection(i);
            ok1.setOnItemSelectedListener(this);
        }else{
            ok.setOnItemSelectedListener(null);
            ok.setSelection(i);
            ok.setOnItemSelectedListener(this);
        }
        // No matter which spinner is selected, get item from the ok [Title] spinner.
        String selectedInstructorName = ok.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();
    }
};

TextWatcher从数据库

2 个答案: