Question

我正在修改我的程序以从数据库中获取其值，我遇到了一些问题而且我对该怎么做有点困惑。我已经被困了好几天了，我很感激你的帮助。

当我在我的微调器上选择一个项目（从数据库填充）时，我需要它传递INT值，以便我可以将它发送到另一个活动。

到目前为止，我的代码看起来像这样，数据库实用程序：

公共类DbUtility {

static final String DB_NAME="food";
static final String BEEF_TABLE="beef";
static final String CHICKEN_TABLE="chicken";

SQLiteDatabase db=null; 
Context context;

public static class DatabaseHelper extends SQLiteOpenHelper
{
    public DatabaseHelper(Context context, String name, CursorFactory factory, int version) 
    {
        super(context, name, factory, version);
        // TODO Auto-generated constructor stub
    }
    @Override
    public void onCreate(SQLiteDatabase db) 
    {           
        db.execSQL("CREATE TABLE IF NOT EXISTS BEEF_TABLE (_id INT PRIMARY KEY,name VARCHAR, cookTime INT);");
        db.execSQL("INSERT INTO BEEF_TABLE values(1,'Skirt Steak', 23000);");
        db.execSQL("INSERT INTO BEEF_TABLE values(2,'Flank Steak',23000);");
        db.execSQL("INSERT INTO BEEF_TABLE values(3,'Filet Mignon',23000);");
        db.execSQL("CREATE TABLE IF NOT EXISTS CHICKEN_TABLE (_id INT PRIMARY KEY,name VARCHAR, cookTime INT);");
        db.execSQL("INSERT INTO CHICKEN_TABLE values(1,'Breast',20000);");
        db.execSQL("INSERT INTO CHICKEN_TABLE values(2,'Wings',10000);");
        db.execSQL("INSERT INTO CHICKEN_TABLE values(3,'Burger',30000);");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  
    }   
}
public DbUtility(Context context) {
    this.context=context;
}
public SimpleCursorAdapter getBeefAdapter()
{
    DatabaseHelper dbhelper=new DatabaseHelper(this.context, DB_NAME, null, 1);
    db=dbhelper.getWritableDatabase();

    Cursor beefCursor=db.rawQuery("SELECT * FROM BEEF_TABLE", null);
    while(!beefCursor.isLast())
    beefCursor.moveToNext(); //I don't understand why but it's necessary (alternative call c.getCount() )
    String[] beefType=new String[1];
    int[] to=new int[1];
    beefType[0]="name";
    to[0]=android.R.id.text1;
    SimpleCursorAdapter beefAdapter=new SimpleCursorAdapter(this.context, android.R.layout.simple_spinner_item, beefCursor, beefType, to);
    beefAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    db.close();
    return beefAdapter; 

}   


public SimpleCursorAdapter getChickenAdapter()
{
    DatabaseHelper dbhelper=new DatabaseHelper(this.context, DB_NAME, null, 1);
    db=dbhelper.getWritableDatabase();

    Cursor chickenCursor=db.rawQuery("SELECT * FROM CHICKEN_TABLE", null);
    while(!chickenCursor.isLast())
    chickenCursor.moveToNext(); //I don't understand why but it's necessary (alternative call c.getCount() )
    String[] chickenType=new String[1];
    int[] type=new int[1];
    chickenType[0]="name";
    type[0]=android.R.id.text1;
    SimpleCursorAdapter chickenAdapter=new SimpleCursorAdapter(this.context, android.R.layout.simple_spinner_item, chickenCursor, chickenType, type);
    chickenAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    db.close();
    return chickenAdapter;  
}   

public int getCookTime(String theTable, String theFood) 
{
    DatabaseHelper dbhelper=new DatabaseHelper(this.context, DB_NAME, null, 1);
    SQLiteDatabase db=dbhelper.getReadableDatabase();
    int TheCookTime = 0;
    Cursor foodCursor = db.rawQuery("SELECT * FROM " + theTable + " WHERE name='" + theFood + "'", null);
    TheCookTime = foodCursor.getInt(foodCursor.getColumnIndex("cookTime"));
    return TheCookTime;
}

我需要抓住，cookTime INT并将其传递给我的微调器活动：

package com.tsilo.grillbuddy;

import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.SimpleCursorAdapter; import android.widget.Spinner;

公共类ChickenActivity扩展了Activity {

int option1value;
int option2value;
/** Called when the activity is first created. */
@Override

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.spinner);

    final DbUtility db=new DbUtility(this);


    SimpleCursorAdapter beefAdapter=db.getBeefAdapter();
    final Spinner beefSpinner=(Spinner)this.findViewById(R.id.spinner);
    beefSpinner.setAdapter(beefAdapter);

    SimpleCursorAdapter chickenAdapter=db.getChickenAdapter();
    final Spinner chickenSpinner=(Spinner)this.findViewById(R.id.spinner2);
    chickenSpinner.setAdapter(chickenAdapter);

    Button TimerButton = (Button)findViewById(R.id.TimerActivityButton);
    TimerButton.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v)
        {
            String beefSelection = (String) beefSpinner.getSelectedItem();
            option1value = db.getCookTime(DbUtility.BEEF_TABLE, beefSelection);
            String chickenSelection = (String) chickenSpinner.getSelectedItem();
            option2value = db.getCookTime(DbUtility.CHICKEN_TABLE, chickenSelection);
            Intent timer = new Intent (ChickenActivity.this,TimerActivity.class);
            timer.putExtra("option1", option1value);
            timer.putExtra("option2", option2value);
            startActivity(timer);
        }
    });

}

编辑：正如您所看到我合并了解决方案，我被要求将我的微调器更改为最终，以便他们工作并将DbUtility更改为db。它编译好没有错误，当我点击它时，我能够进入我的鸡活动，但是当我点击我的计时器按钮时，我现在得到一个力，我的DDMS看起来如下

alt text

Answer 1

编辑... 好的，请尝试使用TimerButton onClick（）方法。您的SimpleCursorAdapters需要声明为'final'，但您的Spinners不再需要是ChickenActivity中的DBUtility数据库实例。

    TimerButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            option1value = getCookTime(beefAdapter);
            option2value = getCookTime(chickenAdapter);

            Intent timer = new Intent (ChickenActivity.this, TimerActivity.class);
            timer.putExtra("option1", option1value);
            timer.putExtra("option2", option2value);
            startActivity(timer);
        }
    });

此外，不是在DBUtility类中使用getCookTime（）方法，而是将其添加到ChickenActivity类中。我已经添加了一些android.util.Log调用，所以你可以按照你需要的方式测试它。

    public int getCookTime(SimpleCursorAdapter adapter) {
        String theName = "None";
        int theCookTime = 0;

        Cursor theCursor = adapter.getCursor();
        theName = theCursor.getString(theCursor.getColumnIndex("name"));
        theCookTime = theCursor.getInt(theCursor.getColumnIndex("cookTime"));
        android.util.Log.i("ChickenActivity", "theName: " + theName);
        android.util.Log.i("ChickenActivity", "theCookTime: " + theCookTime);
        return theCookTime;
    }

Android SQlite，如何将两个值传递给另一个活动？

1 个答案: