Wie Sqlite Datenbank mit Spinner und Suchleisten suchen?

Question

Ich habe eine Reihe von Spinner und Suchleisten für meine Hauptaktivität und möchte die Benutzereingaben von dort verwenden, um eine sq-lite-Datenbank abzufragen und die Ergebnisse in meiner Ergebnisaktivität zurückzugeben. Bitte kannst du mir dabei helfen.

ich abfragen, um die Datenbank in der DatabaseAccess.java Klasse

Das ist mein 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> 

Dies ist die 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; 
    } 
} 

Database Helper

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); 
    } 
    } 

und schließlich die 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> 

Dank

Answer 1

Ich schätze, dass Sie Schwierigkeiten haben, die Daten an die neue Aktivität vorbei und dann für diese Daten abfragen?

Der einfachste Weg wäre Extras zu der Absicht hinzuzufügen und sie dann in der neuen Tätigkeit herausziehen:

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); 
} 

In der nächsten Aktivität, ziehen die Werte aus den Intent Extras und dann die Werte übergeben an die Methode 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); 

     ... 
    } 

Ich habe keine Ahnung, was Ihre Spaltennamen oder Typen sind, so vermute ich hier. Sie müssen auch sicherstellen, dass der SQL gültig ist und möglicherweise einfache Anführungszeichen um die Stiche hinzufügt.

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; 
} 

Ich baue keine allgemein SQL so mehr, verwende ich immer ein ORM, mit Objekten mit der DB zu tun.