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我有一個遊戲，我想在前10名的結果和結果將由2件事情 - 困難（簡單，中等，困難）和得分（整數）。到目前爲止，我嘗試了一段時間，現在明白這一點的SQLite如何在Android的工作室，我仍然感到困惑，但這裏讀幾個教程後是我想方設法組成：下面這個類DBHandler類如何保存高分和時間在我的遊戲SQLite
public class DBHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "highscores";
private static final String TABLE_DETAIL = "scores";
private static final String KEY_ID = "id";
private static final String KEY_TIME = "time";
private static final String KEY_DIFFICULTY = "difficutly";
public DBHandler(Context context){ super(context, DATABASE_NAME, null, DATABASE_VERSION);}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_HIGHSCORES_TABLE = "CREATE TABLE" + TABLE_DETAIL + "("
+ KEY_ID + " INTEGER PRIMARY KEY, "
+ KEY_TIME + " TEXT, "
+ KEY_DIFFICULTY + " TEXT, ";
db.execSQL(CREATE_HIGHSCORES_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_DETAIL); // tova maha starata tablica ako s16testvuva
onCreate(db); // tova q pravi nanovo
}
// Adding new score
public void addScore(int score) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_TIME, score); // score value
// Inserting Values
db.insert(TABLE_DETAIL, null, values);
db.close();
}
// Getting All Scores
public String[] getAllScores() {
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_DETAIL;
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;
}
}
，我不知道爲什麼它甚至是必需的，但我看到它在每一個教程，所以我將它複製...
public class Contact {
//private variables
int _id;
String difficulty;
String time;
// Empty constructor
public Contact(){
}
// constructor
public Contact(int id, String name, String _phone_number){
this._id = id;
this.difficulty = name;
this.time = _phone_number;
}
// constructor
public Contact(String name, String _phone_number){
this.difficulty = name;
this.time = _phone_number;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting name
public String getName(){
return this.difficulty;
}
// setting name
public void setName(String name){
this.difficulty = name;
}
和最後一堂課
public class highscores extends Activity {
private ListView scorebox;
@Override
protected void onCreate(Bundle savedInstanceState) {
DBHandler db = new DBHandler(this);
scorebox = (ListView) findViewById(R.id.scorebox);
super.onCreate(savedInstanceState);
setContentView(R.layout.highscores);
Log.d("Insert: ", "Inserting ..");
db.addScore(9000);
Log.d("Reading: ", "Reading all contacts..");
}
}
我在最後一節課試圖把有些數據只是爲了測試數據庫，但是一旦我點擊按鈕打開數據庫，應用程序就會崩潰，這就是我放棄的地方，並決定尋求幫助。 錯誤是一個很長的錯誤：
FATAL EXCEPTION: main
Process: com.example.user.myapplication, PID: 24731
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.myapplication/com.example.user.myapplication.highscores}: android.database.sqlite.SQLiteException: near "TABLEscores": syntax error (code 1): , while compiling: CREATE TABLEscores(id INTEGER PRIMARY KEY, time TEXT, difficutly TEXT,
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.database.sqlite.SQLiteException: near "TABLEscores": syntax error (code 1): , while compiling: CREATE TABLEscores(id INTEGER PRIMARY KEY, time TEXT, difficutly TEXT,
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608)
at com.example.user.myapplication.DBHandler.onCreate(DBHandler.java:34)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.user.myapplication.DBHandler.addScore(DBHandler.java:46)
at com.example.user.myapplication.highscores.onCreate(highscores.java:25)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
請細化您的代碼片段，我們很難解析您項目中的所有代碼，如果您可以嘗試查明問題並僅提供代碼，那麼可能會更容易排除故障 – Bawpotter