我是编码的初学者，所以我有一个问题。我有一个词汇应用程序，用于测试用户的词汇量。我的想法是将每个新单词放入一个组（进入1,2,3,4,5或6组）。因此，当只有美国人在几个词汇表上进行测试时，他可以使用其中一个组。因为我也是sqlite的初学者，我不知道怎么做这个。我的代码：
voc_liste：
package com.example.calebseeling.frenchlearning.lists;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import com.example.calebseeling.frenchlearning.Databases.DatabaseHelper_voc;
import com.example.calebseeling.frenchlearning.Databases.DatabaseHelper_voc_german;
import com.example.calebseeling.frenchlearning.Activitys.ListVocDataLayout;
import com.example.calebseeling.frenchlearning.Databases.Database_for_numbers;
import com.example.calebseeling.frenchlearning.R;
/**
* Created by calebseeling on 27.01.18.
*/
public class voc_liste extends AppCompatActivity {
private static final String TAG = "MainActivity";
public DatabaseHelper_voc mDatabaseHelper;
public DatabaseHelper_voc_german mDatabaseHelper_2;
public Database_for_numbers mDatabaseHelper_3;
private Button btnAdd, btnViewData;
private EditText editText , editText_2;
private static int number = 0;
private static String newEntry;
private static String newEntry_2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.voc_liste);
editText = (EditText) findViewById(R.id.editText_1);
btnAdd = (Button) findViewById(R.id.btnAdd_1_1);
btnViewData = (Button) findViewById(R.id.btnView_1);
mDatabaseHelper = new DatabaseHelper_voc(this);
mDatabaseHelper_2 = new DatabaseHelper_voc_german(this);
editText_2 = (EditText) findViewById(R.id.editText_2);
Spinner spinner = (Spinner) findViewById(R.id.planets_spinner);
String[] items = new String[]{"1", "2", "3","4", "5", "6"};
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
spinner.setAdapter(adapter);
String spinner_text = spinner.getSelectedItem().toString();
if (spinner_text.equals(1)) {
number = 1;
}
if (spinner_text.equals(2)){
number = 2;
}
if (spinner_text.equals(3)){
number = 3;
}if (spinner_text.equals(4)){
number = 4;
}if (spinner_text.equals(5)){
number = 5;
}if (spinner_text.equals(6)){
number = 6;
}
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String newEntry = editText.getText().toString();
String newEntry_2 = editText_2.getText().toString();
if (editText.length() != 0 && editText_2.length() != 0) {
AddData(newEntry , number);
AddData_2(newEntry_2);
editText.setText("");
editText_2.setText("");
} else {
toastMessage("Sie müssen eine Vokabel ins Feld schreiben");
}
}
});
btnViewData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(voc_liste.this, ListVocDataLayout.class);
startActivity(intent);
}
});
}
public void AddData(String newEntry , int number) {
boolean insertData = mDatabaseHelper.addData(newEntry , number);
if (insertData) {
toastMessage("Super. Neuer Schüler hinzugefügt");
} else {
toastMessage("Error 404");
}
}
public void AddData_2(String newEntry_2) {
boolean insertData_2 = mDatabaseHelper_2.addData(newEntry_2);
if (insertData_2) {
toastMessage("Super. Neuer Schüler hinzugefügt");
} else {
toastMessage("Error 404");
}
}
/**
* customizable toast
* @param message
*/
private void toastMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
public static int getNumber(){
return number;
}
public static String getString(){
return newEntry;
}
public DatabaseHelper_voc getmDatabaseHelper(){
return mDatabaseHelper;
}
}
ListVocDataLayout：
package com.example.calebseeling.frenchlearning.Activitys;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
/**
* Created by calebseeling on 27.01.18.
*/
import com.example.calebseeling.frenchlearning.Databases.DatabaseHelper_voc;
import com.example.calebseeling.frenchlearning.Databases.DatabaseHelper_voc_german;
import com.example.calebseeling.frenchlearning.Databases.Database_for_numbers;
import com.example.calebseeling.frenchlearning.R;
import com.example.calebseeling.frenchlearning.lists.voc_liste;
/**
* Created by User on 2/28/2017.
*/
public class ListVocDataLayout extends AppCompatActivity {
private static final String TAG = "ListDataActivity";
private static ListAdapter adapter;
public DatabaseHelper_voc mDatabaseHelper;
public DatabaseHelper_voc_german mDatabaseHelper_2;
public Database_for_numbers mDatabaseHelper_3;
private static ListView mListView_1;
public static ArrayList<String> listData;
public static ArrayList<String> listData_2;
private static ListView mListView_2;
private static int long_1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_layout_voc);
mListView_1 = (ListView) findViewById(R.id.listView_1);
mListView_2 = (ListView) findViewById(R.id.listView_2);
mDatabaseHelper = new DatabaseHelper_voc(this);
mDatabaseHelper_2 = new DatabaseHelper_voc_german(this);
listData = null;
populateListView();
populateListView_2();
}
public void populateListView() {
Log.d(TAG, "populateListView: Displaying data in the ListView.");
//get the data and append to a list
Cursor data = mDatabaseHelper.getData();
listData = new ArrayList<>();
while(data.moveToNext()){
//get the value from the database in column 1
listData.add(data.getString(1));
}
//create the list adapter and set the adapter
ListAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, listData);
mListView_1.setAdapter(adapter);
//set an onItemClickListener to the ListView
Toast.makeText(this, "ALso?" + listData , Toast.LENGTH_SHORT).show();
mListView_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String name = adapterView.getItemAtPosition(i).toString();
Log.d(TAG, "onItemClick: You Clicked on " + name);
Cursor data = mDatabaseHelper.getItemID(name); //get the id associated with that name
int itemID = -1;
while(data.moveToNext() ){
itemID = data.getInt(0);
}
if(itemID > -1 ){
Log.d(TAG, "onItemClick: The ID is: " + itemID );
Intent editScreenIntent = new
editScreenIntent.putExtra("id",itemID);
editScreenIntent.putExtra("name",name);
startActivity(editScreenIntent);
}
else{
Log.d(TAG,"else problem");
}
}
});
}
public void populateListView_2() {
Log.d(TAG, "populateListView: Displaying data in the ListView.");
//get the data and append to a list
Cursor data = mDatabaseHelper_2.getData();
listData_2 = new ArrayList<>();
while(data.moveToNext()){
//get the value from the database in column 1
listData_2.add(data.getString(1));
}
Log.d(TAG, "???" + data);
Log.d(TAG, "BITTEE MIT SMACKES" + listData_2);
//create the list adapter and set the adapter
adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, listData_2);
mListView_2.setAdapter(adapter);
long_1 = mListView_1.getAdapter().getCount();
Log.d(TAG, "ALSO WIE LANG?"+long_1);
//set an onItemClickListener to the ListView
mListView_2.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String name = adapterView.getItemAtPosition(i).toString();
Log.d(TAG, "onItemClick: You Clicked on " + name);
Cursor data = mDatabaseHelper_2.getItemID(name); //get the id associated with that name
int itemID = -1;
while(data.moveToNext() ){
itemID = data.getInt(0);
}
if(itemID > -1 ){
Log.d(TAG, "onItemClick: The ID is: " + itemID );
Intent editScreenIntent = new Intent(ListVocDataLayout.this, Edit_Voc_Data_German_Activity.class);
editScreenIntent.putExtra("id",itemID);
editScreenIntent.putExtra("name",name);
startActivity(editScreenIntent);
}
else{
Log.d(TAG,"else problem");
}
}
});
}
//set an onItemClickListener to the ListView
/**
* customizable toast
* @param message
*/
private void toastMessage(String message) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
}
DatabaseHelper_voc：
package com.example.calebseeling.frenchlearning.Databases;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseErrorHandler;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.provider.ContactsContract;
import android.util.Log;
/**
* Created by User on 2/28/2017.
*/
public class DatabaseHelper_voc extends SQLiteOpenHelper {
private static final String TAG = "DatabaseHelper";
public static final String TABLE_NAME = "Voc_table";
public static final String COL1 = "ID";
private static final String COL1_1 = "ID_1";
private static final String COL2 = "French";
private static final String COL3 = "German";
private static final String COL4 = "Product";
public static SQLiteDatabase db;
public DatabaseHelper_voc(Context context) {
super(context, TABLE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
COL2 +" TEXT" + COL4 + " INTEGER";
db.execSQL(createTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
public boolean addData(String item , int item2) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues French = new ContentValues();
French.put(COL2, item);
French.put(COL4, item2);
Log.d(TAG, "addData: Adding " + item + item2 + " to " + TABLE_NAME);
long result = db.insert(TABLE_NAME, null, French);
//if data as inserted incorrectly it will return -1
if (result == -1) {
return false;
} else {
return true;
}
}
/**
* Returns all the data from database
* @return
*/
public Cursor getData(){
SQLiteDatabase db = this.getWritableDatabase();
String query = "SELECT * FROM " + TABLE_NAME;
Cursor data = db.rawQuery(query, null);
return data ;
}
/**
* Returns only the ID that matches the name passed in
* @param name
* @return
*/
public Cursor getItemID(String name){
SQLiteDatabase db = this.getWritableDatabase();
String query = "SELECT " + COL1 + " FROM " + TABLE_NAME +
" WHERE " + COL2 + " Where" + COL4 + " = '" + name + "'";
Cursor data = db.rawQuery(query, null);
Log.d(TAG, "OKAYY" + data);
return data;
}
/**
* Updates the name field
* @param newName
* @param id
* @param oldName
*/
public void updateName(String newName, int id, String oldName){
SQLiteDatabase db = this.getWritableDatabase();
String query = "UPDATE " + TABLE_NAME + " SET " + COL2 +
" = '" + newName + "' WHERE " + COL1 + " = '" + id + "'" +
" AND " + COL2 + " AND " + COL4 + " = '" + oldName + "'";
Log.d(TAG, "updateName: query: " + query);
Log.d(TAG, "updateName: Setting name to " + newName);
db.execSQL(query);
}
/**
* Delete from database
* @param id
* @param name
*/
public void deleteName(int id, String name){
SQLiteDatabase db = this.getWritableDatabase();
String query = "DELETE FROM " + TABLE_NAME + " WHERE "
+ COL1 + " = '" + id + "'" +
" AND " + COL2 + " AND " + COL4 + " = '" + name + "'";
Log.d(TAG, "deleteName: query: " + query);
Log.d(TAG, "deleteName: Deleting " + name + " from database.");
db.execSQL(query);
}
public static SQLiteDatabase getdb(){
return db;
}
public static String getTableName() {
return TABLE_NAME;
}
public static SQLiteDatabase getDb() {
return db;
}
}