Как искать Sqlite databse с помощью прядильщиков и поисковых систем?

Question

У меня есть набор прядильщиков и поисковых барабанов в моем основном действии и вы хотите использовать пользовательские входы отсюда, чтобы запросить базу данных sqllite и вернуть результаты в мою работу с результатами. Пожалуйста, помогите мне с этим.

я запроса к базе данных в DatabaseAccess.java класса

Это мой activity_main.xml

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:orientation="vertical" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:background="#f5f5f5"> 
    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="@color/colorPrimary" 
     android:elevation="4dp" 
app:titleTextColor="#FFFFFF" 
     android:theme="@style/ThemeOverlay.AppCompat.ActionBar" 
     app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/> 

    <ScrollView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     > 



     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_margin="16dp" 
      android:elevation="4dp" 

      > 
      <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:orientation="vertical" 
       android:padding="16dp"> 

       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:padding="16dp" 
        android:paddingTop="16dp" 
        android:textSize="16sp" 

        android:text="Hunger Level" /> 
       <Spinner 
        android:id="@+id/hunger_spinner" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 


        android:padding="16dp" 

        > 

       </Spinner> 
       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:padding="16dp" 
        android:textSize="16sp" 
        android:text="Cuisine" /> 
       <Spinner 
        android:id="@+id/cuisine_spinner" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 


        android:padding="16dp" 

        > 

       </Spinner> 
       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:padding="16dp" 
        android:textSize="16sp" 
        android:text="Preparation Time" /> 
       <Spinner 
        android:id="@+id/time_spinner" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 


        android:padding="16dp" 

        > 

       </Spinner> 
       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:padding="16dp" 
        android:textSize="16sp" 
        android:text="Course" /> 
       <Spinner 
        android:id="@+id/course_spinner" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 


        android:padding="16dp" 

        > 

       </Spinner> 

       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="Salty" 
        android:padding="16dp" 
        android:textSize="16sp" 
        /> 
       <TextView 
        android:id="@+id/howSalty" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal" 
        /> 

       <SeekBar 
        android:id="@+id/salty" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:thumbTint="@color/colorAccent" 
        android:progressTint="@color/colorAccent" 
        android:max="2" 
        android:progress="1" 
        /> 
       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="Sweet" 
        android:padding="16dp" 
        android:textSize="16sp"/> 
       <TextView 
        android:id="@+id/howSweet" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal"/> 
       <SeekBar 
        android:thumbTint="@color/colorAccent" 
        android:progressTint="@color/colorAccent" 
        android:id="@+id/sweet" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:max="2" 
        android:progress="1" 
        /> 


       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="Spicy" 
        android:padding="16dp" 
        android:textSize="16sp"/> 

       <TextView 
        android:id="@+id/howSpicy" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_horizontal" 
        /> 
       <SeekBar 
        android:thumbTint="@color/colorAccent" 
        android:progressTint="@color/colorAccent" 
        android:id="@+id/spicy" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:max="2" 
android:progress="1" 

        /> 

       <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 

        android:padding="16dp" 
        android:text="Special Requirements" 

        android:textSize="16sp" /> 

       <GridLayout 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 

        android:layout_margin="16dp" 
        android:columnCount="2" 
        android:rowCount="3"> 



        <CheckBox 
         android:layout_width="wrap_content" 
         android:buttonTint="@color/colorAccent" 
         android:layout_height="wrap_content" 
         android:text="Dairy Free" 
         android:textSize="16sp" /> 

        <CheckBox 
         android:layout_width="wrap_content" 

         android:buttonTint="@color/colorAccent" 
         android:layout_height="wrap_content" 
         android:text="Nut Free" 
         android:textSize="16sp" /> 

        <CheckBox 
         android:layout_width="wrap_content" 
         android:buttonTint="@color/colorAccent" 
         android:layout_height="wrap_content" 
         android:text="Egg Free" 
         android:textSize="16sp" 
         /> 

        <CheckBox 
         android:layout_width="wrap_content" 
         android:buttonTint="@color/colorAccent" 
         android:layout_height="wrap_content" 
         android:text="Vegetarian" 
         android:textSize="16sp" /> 
       </GridLayout> 
       <Button 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 

        android:layout_margin="16dp" 
        android:onClick="go" 

        android:text="go" /> 
      </LinearLayout> 
     </android.support.v7.widget.CardView> 

    </ScrollView> 
</LinearLayout> 

Это MainActivity.java

package com.example.rcadit.foodgenie; 

import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.SeekBar; 
import android.widget.Spinner; 
import android.widget.TextView; 


import butterknife.ButterKnife; 
import butterknife.InjectView; 




public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener { 
    private static final String TAG = "MyActivity"; 


    public void onNothingSelected(AdapterView<?> parent) { 
     // Another interface callback 
    } 

    Toolbar toolbar; 
    @InjectView(R.id.salty) 
    SeekBar salty; 
    private String hungerValue; 
    private String cuisineValue; 
    private String prepValue; 
    private String courseValue; 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 


     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     ButterKnife.inject(this); 
     initToolBar(); 
     saltySlider(); 
     spicySlider(); 
     sweetSlider(); 


     Spinner hunger_spinner = (Spinner) findViewById(R.id.hunger_spinner); 
     hunger_spinner.setOnItemSelectedListener(this); 
      ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, 
       R.array.hunger_level, android.R.layout.simple_spinner_item); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     hunger_spinner.setAdapter(adapter); 



     Spinner cuisine_spinner = (Spinner) findViewById(R.id.cuisine_spinner); 
     cuisine_spinner.setOnItemSelectedListener(this); 
         ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, 
        R.array.cuisine, android.R.layout.simple_spinner_item); 
           adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
       cuisine_spinner.setAdapter(adapter2); 

     Spinner prep_spinner = (Spinner) findViewById(R.id.time_spinner); 
     prep_spinner.setOnItemSelectedListener(this); 
       ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this, 
       R.array.preparation_time, android.R.layout.simple_spinner_item); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     prep_spinner.setAdapter(adapter3); 

     Spinner course_spinner = (Spinner) findViewById(R.id.course_spinner); 
     course_spinner.setOnItemSelectedListener(this); 
       ArrayAdapter<CharSequence> adapter4 = ArrayAdapter.createFromResource(this, 
       R.array.course, android.R.layout.simple_spinner_item); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
course_spinner.setAdapter(adapter4); 


} 

    @Override 
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); 
     Spinner spinner = (Spinner) parent; 
     // On selecting a spinner item 
     String value = parent.getItemAtPosition(position).toString(); 
     if ("Low".equals(value)) { 
      hungerValue = "1"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("hungerData", hungerValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("Medium".equals(value)) { 
      hungerValue = "2"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("hungerData", hungerValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("High".equals(value)) { 
      hungerValue = "3"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("hungerData", hungerValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("Under 10 mins".equals(value)) { 
      prepValue = "< 10"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("prepData", prepValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("No Preparation".equals(value)) { 
      prepValue = " = 0"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("prepData", prepValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("Under 20 mins".equals(value)) { 
      prepValue = "< 20"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("prepData", prepValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("Under 30 mins".equals(value)) { 
      prepValue = "< 30"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("prepData", prepValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if ("Over 30 mins".equals(value)) { 
      prepValue = "> 30"; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("prepData", prepValue); //InputString: from the EditText 
      editor.apply(); 
     } 
     if(spinner.getId() == R.id.cuisine_spinner) 
     { 
      cuisineValue = value; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("cuisineData", cuisineValue); //InputString: from the EditText 
      editor.apply(); 
     } 

     if(spinner.getId() == R.id.course_spinner) 
     { 
      courseValue = value; 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putString("courseData", courseValue); //InputString: from the EditText 
      editor.apply(); 
     } 

     Log.d(TAG, "onItemSelected: " + value + " " + courseValue+ " "+ cuisineValue + " "+ prepValue + " "+ hungerValue); 

    } 



    public String getHungerValue(){ 
     return hungerValue; 
    } 


    public String getCuisineValue(){ 
     return cuisineValue; 
    } 


    public String getPrepValue(){ 
     return prepValue; 
    } 


    public String getCourseValue(){ 
     return courseValue; 
    } 


    private void saltySlider() { 
     salty.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
      int progressChanged = 0; 

      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 
       progressChanged = progress * 50; 
      } 

      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 

      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
       if (progressChanged < 100/3) { 
        TextView textView = (TextView) findViewById(R.id.howSalty); 
        textView.setHint("Not Salty"); 

       } 
       if (progressChanged > 100/3 & progressChanged < 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSalty); 
        textView.setHint("Salty"); 
       } 
       if (progressChanged > 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSalty); 
        textView.setHint("Very Salty"); 
       } 
      } 
     }); 
    } 

    private void sweetSlider() { 
     SeekBar sweet = (SeekBar) findViewById(R.id.sweet); 
     sweet.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
      int progressChanged = 0; 

      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 
       progressChanged = progress * 50; 
      } 

      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 

      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
       if (progressChanged < 100/3) { 
        TextView textView = (TextView) findViewById(R.id.howSweet); 
        textView.setHint("Not Sweet"); 

       } 
       if (progressChanged > 100/3 & progressChanged < 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSweet); 
        textView.setHint("Sweet"); 
       } 
       if (progressChanged > 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSweet); 
        textView.setHint("Very Sweet"); 
       } 
      } 
     }); 
    } 

    private void spicySlider() { 
     SeekBar spicy = (SeekBar) findViewById(R.id.spicy); 
     spicy.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
      int progressChanged = 0; 

      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { 
       progressChanged = progress * 50; 
      } 

      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 

      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
       if (progressChanged < 100/3) { 
        TextView textView = (TextView) findViewById(R.id.howSpicy); 
        textView.setHint("Not Spicy"); 

       } 
       if (progressChanged > 100/3 & progressChanged < 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSpicy); 
        textView.setHint("Spicy"); 
       } 
       if (progressChanged > 2 * (100/3)) { 
        TextView textView = (TextView) findViewById(R.id.howSpicy); 
        textView.setHint("Very Spicy"); 
       } 
      } 
     }); 
    } 

    public void initToolBar() { 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 

     toolbar.setTitle(R.string.app_name); 


     setSupportActionBar(toolbar); 
    } 
    public void go(View view) 
    { 
     Intent intent = new Intent(MainActivity.this, ResultActivity.class); 
     startActivity(intent); 
    } 



} 

DatabaseAccess.java

package com.example.rcadit.foodgenie; 

/** 
* Created by rcadi on 8/22/2016. 
*/ 


import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

import java.util.ArrayList; 
import java.util.List; 

public class DatabaseAccess { 
    private SQLiteOpenHelper openHelper; 
    private SQLiteDatabase database; 
    private static DatabaseAccess instance; 

    /** 
    * Private constructor to aboid object creation from outside classes. 
    * 
    * @param context 
    */ 
    private DatabaseAccess(Context context) { 
     this.openHelper = new DatabaseOpenHelper(context); 
    } 

    /** 
    * Return a singleton instance of DatabaseAccess. 
    * 
    * @param context the Context 
    * @return the instance of DabaseAccess 
    */ 
    public static DatabaseAccess getInstance(Context context) { 
     if (instance == null) { 
      instance = new DatabaseAccess(context); 
     } 
     return instance; 
    } 

    /** 
    * Open the database connection. 
    */ 
    public void open() { 
     this.database = openHelper.getWritableDatabase(); 
    } 

    /** 
    * Close the database connection. 
    */ 
    public void close() { 
     if (database != null) { 
      this.database.close(); 
     } 
    } 

    /** 
    * Read all quotes from the database. 
    * 
    * @return a List of quotes 
    */ 
    public List<String> getResult() { 
     List<String> list = new ArrayList<>(); 
     Cursor cursor = database.rawQuery("SELECT foodName from foodDB ", null); 
     cursor.moveToFirst(); 
     while (!cursor.isAfterLast()) { 
      list.add(cursor.getString(0)); 
      cursor.moveToNext(); 
     } 
     cursor.close(); 
     return list; 
    } 
} 

Helper Database

package com.example.rcadit.foodgenie; 

/** 
* Created by rcadi on 8/22/2016. 
*/ 

import android.content.Context; 

import com.readystatesoftware.sqliteasset.SQLiteAssetHelper; 

public class DatabaseOpenHelper extends SQLiteAssetHelper { 
    private static final String DATABASE_NAME = "foodfile.sqlite"; 
    private static final int DATABASE_VERSION = 1; 

    public DatabaseOpenHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 
} 

ResultsActivity.java

package com.example.rcadit.foodgenie; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

import com.example.rcadit.foodgenie.R; 

import java.util.List; 

import static com.example.rcadit.foodgenie.R.id.toolbar; 

public class ResultActivity extends AppCompatActivity { 
    Toolbar toolbar; 






     private ListView listView; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_result); 
      initToolBar(); 
      this.listView = (ListView) findViewById(R.id.listView); 
      DatabaseAccess databaseAccess = DatabaseAccess.getInstance(this); 
      databaseAccess.open(); 
      List<String> results = databaseAccess.getResult(); 
      databaseAccess.close(); 

      ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, results); 
      this.listView.setAdapter(adapter); 
     } 
    public void initToolBar() { 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 

     toolbar.setTitle(R.string.app_name); 


     setSupportActionBar(toolbar); 
    } 
    } 

И, наконец, activity_results

<?xml version="1.0" encoding="utf-8"?> 


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="@color/colorPrimary" 
     android:elevation="4dp" 
     app:titleTextColor="#FFFFFF" 
     android:theme="@style/ThemeOverlay.AppCompat.ActionBar" 
     app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/> 
     <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 

      tools:context="com.example.rcadit.foodgenie.ResultActivity"> 

      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:layout_margin="16dp" 
       android:elevation="4dp" 

       > 

      <ListView 
       android:id="@+id/listView" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:layout_gravity="center" /> 
      </android.support.v7.widget.CardView> 

     </FrameLayout> 

    </LinearLayout> 

Благодаря

Answer 1

Я предполагаю, что у вас возникли проблемы с передачей данных на новый вид деятельности, а затем запрашивая эти данные?

Проще всего было бы добавить Extras намерению, а затем вывести их в новом виде деятельности:

public void go(View view) 
{ 
    Intent intent = new Intent(MainActivity.this, ResultActivity.class); 
    intent.putExtra(ResultsActivity.HungerValueTag, hungerValue); 
    intent.putExtra(ResultsActivity.CuisineValueTag, cuisineValue); 
    intent.putExtra(ResultsActivity.PrepValueTag, prepValue); 
    intent.putExtra(ResultsActivity.CourseValueTag, CourseValue); 

    startActivity(intent); 
} 

В следующей деятельности, вытащить значения из Намерения Дополнительно, а затем передать значение к методу getResult().

ResultsActivity.java:

public static final String HungerValueTag = "HungerValue"; 
// Add the same for the other three.. 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     ... 

     String hunger = getIntent().getStringValue(HungerValueTag); 
     String cuisine = getIntent().getStringValue(CuisineValueTag); 
     // get the other two 


     List<String> results = databaseAccess.getResult(hunger, cuisine, prep, course); 

     ... 
    } 

Я понятия не имею, что ваши имена столбцов или типы, поэтому я предполагаю, что здесь. Вам также необходимо убедиться, что sql действителен, возможно, добавив одинарные кавычки вокруг укусов.

DatabaseAccess.java

public List<String> getResult(String hunger, String cuisine, String prep, String course) { 
    List<String> list = new ArrayList<>(); 
    String query = String.format("SELECT foodName from foodDB where hunger = %s and cuisine = %s and prep = %s and course = %s", hunger, cuisine, prep, course); 

    Cursor cursor = database.rawQuery(query, null); 
    cursor.moveToFirst(); 
    while (!cursor.isAfterLast()) { 
     list.add(cursor.getString(0)); 
     cursor.moveToNext(); 
    } 
    cursor.close(); 
    return list; 
} 

Я вообще не строить SQL, как это больше, я всегда использую ORM, имея дело с БД с объектами.