所以我已经设置了我的应用程序的一部分，用户可以从微调器中选择最多五个东西（总共五个微调器），现在我有按钮通过一个意图将选择发送到一个新活动，它们显示在一个新的活动，但我想在单击按钮时将选择存储到内部数据库中，然后用户可以从菜单中检索他们的选择，然后按下按钮显示数据。
public class IwiSelect extends Activity {
Spinner spinner1, spinner2, spinner3, spinner4, spinner5;
Button btnSubmit;
String text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_iwiselect);
addListenerOnButton();
}
// get the selected drop down list value
public void addListenerOnButton() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner2 = (Spinner) findViewById(R.id.spinner2);
spinner3 = (Spinner) findViewById(R.id.spinner3);
spinner4 = (Spinner) findViewById(R.id.spinner4);
spinner5 = (Spinner) findViewById(R.id.spinner5);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
String text0 = spinner1.getSelectedItem().toString();
String text1 = spinner2.getSelectedItem().toString();
String text2 = spinner3.getSelectedItem().toString();
String text3 = spinner4.getSelectedItem().toString();
String text4 = spinner5.getSelectedItem().toString();
//Starting a new Intent
Intent intent = new Intent(IwiSelect.this, SecondScreenActivity.class);
//Sending data to another Activity
intent.putExtra("IWI0", text0);
intent.putExtra("IWI1", text1);
intent.putExtra("IWI2", text2);
intent.putExtra("IWI3", text3);
intent.putExtra("IWI4", text4);
// starting new activity
startActivity(intent);
}
});
}
}
此类将数据发送到新屏幕。
下面的类是我的助手类
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "iwi";
// table name
private static final String TABLE_IWI = "iwis";
// Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "iwiname";
public DatabaseHandler(SecondScreenActivity secondScreenActivity) {
super((Context) secondScreenActivity, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_IWI_TABLE = "CREATE TABLE " + TABLE_IWI + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ " TEXT" + ")";
db.execSQL(CREATE_IWI_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_IWI);
// Create tables again
onCreate(db);
}
// Deleting single contact
public void deleteIwi(Iwi iwi) {}
// Adding new contact
public void addIwi(Iwi iwi) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, iwi.getName());
// Inserting Row
db.insert(TABLE_IWI, null, values);
db.close(); // Closing database connection
}
// Getting single contact
public Iwi getIwi(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_IWI, new String[] { KEY_ID,
KEY_NAME, }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Iwi iwi = new Iwi(Integer.parseInt(cursor.getString(0)),
cursor.getString(1));
// return contact
return iwi;
}
// Getting All Contacts
public List<Iwi> getAllIwi() {
List<Iwi> iwiList = new ArrayList<Iwi>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_IWI;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Iwi iwi = new Iwi();
iwi.setID(Integer.parseInt(cursor.getString(0)));
iwi.setName(cursor.getString(1));
// Adding contact to list
iwiList.add(iwi);
} while (cursor.moveToNext());
}
// return contact list
return iwiList;
}
//Getting contacts Count
public int getIwiCount() {
String countQuery = "SELECT * FROM " + TABLE_IWI;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
// Updating single contact
public int updateIwi(Iwi iwi) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, iwi.getName());
// updating row
return db.update(TABLE_IWI, values, KEY_ID + " = ?",
new String[] { String.valueOf(iwi.getID()) });
}
// Deleting single contact
public void deleteContact(Iwi iwi) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_IWI, KEY_ID + " = ?",
new String[] { String.valueOf(iwi.getID()) });
db.close();
}
}