问题描述
我正在尝试在我的游戏中编写代码以在计时器超时后保存分数.我有我的分数,我有我的计时器.我已经阅读了一些关于 SharedPreferences 和 SQLite 的内容.我知道我想保存前 10 个高分,但 SharedPreferences 最好只保存 1 个分数.我正在尝试围绕 SQLite 进行思考,但我就是无法理解.任何人都可以帮助我找出一行代码来只保存前 10 个分数.
I am trying to write in a code in my game to save the score after the timer times out. I have my score and I have my timer. I've read a bit about SharedPreferences and SQLite. I know that I want to save the top 10 high scores, but SharedPreferences is best for just 1 score. I am trying to wrap my head around SQLite but I just cannot get it. Any chance someone could help me to figure out a line of code to save only the top 10 scores.
这是我的 onFinish 代码:
Heres my onFinish code:
public void onFinish() {
textViewTimer.setText("00:000");
timerProcessing[0] = false;
/** This is the Interstitial Ad after the game */
AppLovinInterstitialAd.show(GameActivity.this);
/** This creates the alert dialog when timer runs out */
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(GameActivity.this);
alertDialogBuilder.setTitle("Game Over");
alertDialogBuilder.setMessage("Score: " + count);
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setNeutralButton("Restart", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
Intent restartGame = new Intent(GameActivity.this, GameActivity.class);
startActivity(restartGame);
finish();
}
});
alertDialogBuilder.setNegativeButton("Home", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id) {
GameActivity.this.finish();
}
});
alertDialogBuilder.show();
推荐答案
您可以使用下面给出的代码来保存和检索任意数量的分数.创建一个名为 DatabaseHandler.java 的新数据库助手类,并在其中添加以下代码.
You can use the code given below to save any number of score and retrieve them. Create a new database helper class named, DatabaseHandler.java and add the following code in it.
要在您的活动中初始化类,请将以下行放入您的活动中:
To initialise the class in your activity, put the following line in your activity :
DatabaseHandler db = new DatabaseHandler(this);
然后给db使用添加值,db.addScore(count);
Then to add value to db use, db.addScore(count);
要从数据库中过滤掉前十个分数,您可以将 get 方法中的查询更改为:
To filter out just top ten scores from the db, u may change the query in get method to :
String selectQuery = "SELECT * FROM " + TABLE_SCORE + "LIMIT 10";
.
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 = "game";
// Table name
private static final String TABLE_SCORE = "score";
// Score Table Columns names
private static final String KEY_ID_SCORE = "_id";
private static final String KEY_SCORE = "score_value";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_SCORE_TABLE = "CREATE TABLE " + TABLE_SCORE + "("
+ KEY_ID_SCORE + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_SCORE + " TEXT" + ")";
db.execSQL(CREATE_SCORE_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_SCORE);
// Create tables again
onCreate(db);
}
// Adding new score
public void addScore(int score) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_SCORE, score); // score value
// Inserting Values
db.insert(TABLE_SCORE, null, values);
db.close();
}
// Getting All Scores
public String[] getAllScores() {
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_SCORE;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
int i = 0;
String[] data = new String[cursor.getCount()];
while (cursor.moveToNext()) {
data[i] = cursor.getString(1);
i = i++;
}
cursor.close();
db.close();
// return score array
return data;
}
}
这篇关于高分的 SQLite 或 SharedPreferences的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!