Java Android数据未存储到SQLite数据库

我想问一些关于将Android数据存储到SQLite数据库的问题（我是SQLite数据库的新手）。我一直在尝试将数据存储到SQLite数据库，但当我看到带有SQLiteStudio的数据库时，数据是空的。 这是我的代码：

DatabaseHelper.java

package com.example.toolsmanager;

    import android.content.Context;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;

    public class DatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "btm.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public static final String TABLE_1 = "oneroundsingle";

    public static final String TABLE1_COLUMN1 = "_ID";
    public static final String TABLE1_COLUMN2 = "GAMETYPE";
    public static final String TABLE1_COLUMN3 = "PLAYER1";
    public static final String TABLE1_COLUMN4 = "PLAYER2";
    public static final String TABLE1_COLUMN5 = "SCORE";
    public static final String TABLE1_COLUMN6 = "WINNER";


    public static final String CREATE_TABLE_ORS = "create table" + TABLE_1 + " ( " +
            TABLE1_COLUMN1 + " integer primary key autoincrement, " +
            TABLE1_COLUMN2 + " text, " +
            TABLE1_COLUMN3 + " text, " +
            TABLE1_COLUMN4 + " text, " +
            TABLE1_COLUMN5 + " text, " +
            TABLE1_COLUMN6 + " text " + ");";

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_ORS);
        db.execSQL(CREATE_TABLE_ORD);
        db.execSQL(CREATE_TABLE_RS);
        db.execSQL(CREATE_TABLE_RD);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists" + TABLE_1);
        db.execSQL("drop table if exists" + TABLE_2);
        db.execSQL("drop table if exists" + TABLE_3);
        db.execSQL("drop table if exists" + TABLE_4);
        onCreate(db);
    }
    }

package com.example.toolsmanager;

    import android.content.ContentValues;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.database.sqlite.SQLiteDatabase;
    import android.support.v7.app.AlertDialog;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.TextView;
    import android.widget.Toast;

    public class OR_SingleCount extends AppCompatActivity {

    int player1_score, player2_score, final_score;
    TextView text_player1_name, text_player2_name;
    String score, winner;
    DatabaseHelper databaseHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_or_single_count);

        text_player1_name = (TextView)findViewById(R.id.player1_name);
        text_player1_name.setText(getIntent().getExtras().getString("player1"));

        text_player2_name = (TextView)findViewById(R.id.player2_name);
        text_player2_name.setText(getIntent().getExtras().getString("player2"));

    }

    public void singleCount(View v) {
        int id = v.getId();
        if (id == R.id.player1_plus) {
            player1_score += 1;
            TextView text_player1_score = (TextView) findViewById(R.id.player1_score);
            text_player1_score.setText(String.valueOf(player1_score));
        } else if (id == R.id.player1_minus && player1_score != 0) {
            player1_score -= 1;
            TextView text_player1_score = (TextView) findViewById(R.id.player1_score);
            text_player1_score.setText(String.valueOf(player1_score));
        } else if (id == R.id.player2_plus) {
            player2_score += 1;
            TextView text_player2_score = (TextView) findViewById(R.id.player2_score);
            text_player2_score.setText(String.valueOf(player2_score));
        } else if (id == R.id.player2_minus && player2_score != 0) {
            player2_score -= 1;
            TextView text_player2_score = (TextView) findViewById(R.id.player2_score);
            text_player2_score.setText(String.valueOf(player2_score));
        }
        finalScore();
    }

    public void finalScore(){
        if ((player1_score == 21 && player2_score < 20) || (player2_score == 21 && player1_score < 20)) {
            final_score = 21;
            getWinner();
        } else if (player1_score == 30 || player2_score == 30) {
            final_score = 30;
            getWinner();
        } else if (player1_score >= 20 && player2_score >= 20) {
            if (player1_score == player2_score + 2) {
                final_score = player1_score;
                getWinner();
            } else if (player2_score == player1_score + 2) {
                final_score = player2_score;
                getWinner();
            }
        }
    }

    public void getWinner() {
        if (player1_score == final_score){
            winner = text_player1_name.getText().toString();
            String print_winner = winner + " is the winner";
            Toast.makeText(getApplicationContext(),print_winner, Toast.LENGTH_LONG).show();
        } else if(player2_score == final_score) {
            winner = text_player2_name.getText().toString();
            String print_winner = winner + " is the winner";
            Toast.makeText(getApplicationContext(), print_winner, Toast.LENGTH_LONG).show();
        }

        score = player1_score + " - " + player2_score;
        String gametype = "Single";
        addORSingleData(gametype,
                text_player1_name.getText().toString(),
                text_player2_name.getText().toString(),
                score,
                winner);

        AlertDialog repeatdialog= new AlertDialog.Builder(this)
                .setTitle("Game Finish")
                .setMessage("Do you want to repeat the game?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        player1_score = 0;
                        player2_score = 0;
                        recreate();
                    }
                })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent i = new Intent(OR_SingleCount.this, OneRoundMatch.class);
                        i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(i);
                        finish();
                    }
                }).create();
        repeatdialog.show();
    }

    public void addORSingleData(String gametype, String player1, String player2, String score, String winner){
        databaseHelper = new DatabaseHelper(this);
        SQLiteDatabase db = databaseHelper.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.TABLE1_COLUMN2, gametype);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN3, player1);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN4, player2);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN5, score);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN6, winner);
        db.insert(DatabaseHelper.TABLE_1, null, contentValues);
    }
    }

或_SingleCount.java

package com.example.toolsmanager;

    import android.content.Context;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;

    public class DatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "btm.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public static final String TABLE_1 = "oneroundsingle";

    public static final String TABLE1_COLUMN1 = "_ID";
    public static final String TABLE1_COLUMN2 = "GAMETYPE";
    public static final String TABLE1_COLUMN3 = "PLAYER1";
    public static final String TABLE1_COLUMN4 = "PLAYER2";
    public static final String TABLE1_COLUMN5 = "SCORE";
    public static final String TABLE1_COLUMN6 = "WINNER";


    public static final String CREATE_TABLE_ORS = "create table" + TABLE_1 + " ( " +
            TABLE1_COLUMN1 + " integer primary key autoincrement, " +
            TABLE1_COLUMN2 + " text, " +
            TABLE1_COLUMN3 + " text, " +
            TABLE1_COLUMN4 + " text, " +
            TABLE1_COLUMN5 + " text, " +
            TABLE1_COLUMN6 + " text " + ");";

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE_ORS);
        db.execSQL(CREATE_TABLE_ORD);
        db.execSQL(CREATE_TABLE_RS);
        db.execSQL(CREATE_TABLE_RD);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists" + TABLE_1);
        db.execSQL("drop table if exists" + TABLE_2);
        db.execSQL("drop table if exists" + TABLE_3);
        db.execSQL("drop table if exists" + TABLE_4);
        onCreate(db);
    }
    }

package com.example.toolsmanager;

    import android.content.ContentValues;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.database.sqlite.SQLiteDatabase;
    import android.support.v7.app.AlertDialog;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.TextView;
    import android.widget.Toast;

    public class OR_SingleCount extends AppCompatActivity {

    int player1_score, player2_score, final_score;
    TextView text_player1_name, text_player2_name;
    String score, winner;
    DatabaseHelper databaseHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_or_single_count);

        text_player1_name = (TextView)findViewById(R.id.player1_name);
        text_player1_name.setText(getIntent().getExtras().getString("player1"));

        text_player2_name = (TextView)findViewById(R.id.player2_name);
        text_player2_name.setText(getIntent().getExtras().getString("player2"));

    }

    public void singleCount(View v) {
        int id = v.getId();
        if (id == R.id.player1_plus) {
            player1_score += 1;
            TextView text_player1_score = (TextView) findViewById(R.id.player1_score);
            text_player1_score.setText(String.valueOf(player1_score));
        } else if (id == R.id.player1_minus && player1_score != 0) {
            player1_score -= 1;
            TextView text_player1_score = (TextView) findViewById(R.id.player1_score);
            text_player1_score.setText(String.valueOf(player1_score));
        } else if (id == R.id.player2_plus) {
            player2_score += 1;
            TextView text_player2_score = (TextView) findViewById(R.id.player2_score);
            text_player2_score.setText(String.valueOf(player2_score));
        } else if (id == R.id.player2_minus && player2_score != 0) {
            player2_score -= 1;
            TextView text_player2_score = (TextView) findViewById(R.id.player2_score);
            text_player2_score.setText(String.valueOf(player2_score));
        }
        finalScore();
    }

    public void finalScore(){
        if ((player1_score == 21 && player2_score < 20) || (player2_score == 21 && player1_score < 20)) {
            final_score = 21;
            getWinner();
        } else if (player1_score == 30 || player2_score == 30) {
            final_score = 30;
            getWinner();
        } else if (player1_score >= 20 && player2_score >= 20) {
            if (player1_score == player2_score + 2) {
                final_score = player1_score;
                getWinner();
            } else if (player2_score == player1_score + 2) {
                final_score = player2_score;
                getWinner();
            }
        }
    }

    public void getWinner() {
        if (player1_score == final_score){
            winner = text_player1_name.getText().toString();
            String print_winner = winner + " is the winner";
            Toast.makeText(getApplicationContext(),print_winner, Toast.LENGTH_LONG).show();
        } else if(player2_score == final_score) {
            winner = text_player2_name.getText().toString();
            String print_winner = winner + " is the winner";
            Toast.makeText(getApplicationContext(), print_winner, Toast.LENGTH_LONG).show();
        }

        score = player1_score + " - " + player2_score;
        String gametype = "Single";
        addORSingleData(gametype,
                text_player1_name.getText().toString(),
                text_player2_name.getText().toString(),
                score,
                winner);

        AlertDialog repeatdialog= new AlertDialog.Builder(this)
                .setTitle("Game Finish")
                .setMessage("Do you want to repeat the game?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        player1_score = 0;
                        player2_score = 0;
                        recreate();
                    }
                })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent i = new Intent(OR_SingleCount.this, OneRoundMatch.class);
                        i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(i);
                        finish();
                    }
                }).create();
        repeatdialog.show();
    }

    public void addORSingleData(String gametype, String player1, String player2, String score, String winner){
        databaseHelper = new DatabaseHelper(this);
        SQLiteDatabase db = databaseHelper.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.TABLE1_COLUMN2, gametype);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN3, player1);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN4, player2);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN5, score);
        contentValues.put(DatabaseHelper.TABLE1_COLUMN6, winner);
        db.insert(DatabaseHelper.TABLE_1, null, contentValues);
    }
    }

package com.example.toolsmanager；
导入android.content.ContentValues；
导入android.content.DialogInterface；
导入android.content.Intent；
导入android.database.sqlite.SQLiteDatabase；
导入android.support.v7.app.AlertDialog；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.view.view；
导入android.widget.TextView；
导入android.widget.Toast；
公共类或\u SingleCount扩展了AppCompative活动{
国际球员1分、2分、决赛分；
text查看text\u player1\u名称，text\u player2\u名称；
弦乐得分，胜者；
数据库助手数据库助手；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u或\u single\u count）；
text_player1_name=（TextView）findViewById（R.id.player1_name）；
text_player1_name.setText（getIntent（）.getExtras（）.getString（“player1”）；
text_player2_name=（TextView）findViewById（R.id.player2_name）；
text_player2_name.setText（getIntent（）.getExtras（）.getString（“player2”）；
}
公共void singleCount（视图五）{
int id=v.getId（）；
if（id==R.id.player1\u加）{
球员1分(u分)+=1分;；
TextView text_player1_分数=（TextView）findViewById（R.id.player1_分数）；
text_player1_score.setText（String.valueOf（player1_score））；
}否则如果（id==R.id.player1\u减去&player1\u分数！=0）{
球员1分-=1分；
TextView text_player1_分数=（TextView）findViewById（R.id.player1_分数）；
text_player1_score.setText（String.valueOf（player1_score））；
}else if（id==R.id.player2\u plus）{
球员2分+1分；
TextView text_player2_分数=（TextView）findViewById（R.id.player2_分数）；
text_player2_score.setText（String.valueOf（player2_score））；
}否则如果（id==R.id.player2\u减和&player2\u得分！=0）{
球员2分(u分)=1分;；
TextView text_player2_分数=（TextView）findViewById（R.id.player2_分数）；
text_player2_score.setText（String.valueOf（player2_score））；
}
finalScore（）；
}
public void finalScore（）{
如果（（player1_得分=21和&player2_得分<20）|（player2_得分=21和&player1_得分<20））{
最终得分=21分；
getWinner（）；
}否则如果（玩家1|U分数=30 |玩家2|U分数=30）{
最终得分=30分；
getWinner（）；
}否则如果（玩家1分>=20和玩家2分>=20）{
如果（玩家1分==玩家2分+2分）{
最终得分=选手1分；
getWinner（）；
}否则如果（玩家2分==玩家1分+2分）{
最终得分=运动员2分；
getWinner（）；
}
}
}
公开无效的getWinner（）{
如果（球员1分=最终分）{
winner=text\u player1\u name.getText（）.toString（）；
String print_winner=winner+“是赢家”；
Toast.makeText（getApplicationContext（），print_winner，Toast.LENGTH_LONG）.show（）；
}否则如果（玩家2分=最终分）{
winner=text\u player2\u name.getText（）.toString（）；
String print_winner=winner+“是赢家”；
Toast.makeText（getApplicationContext（），print_winner，Toast.LENGTH_LONG）.show（）；
}
分数=玩家1分+玩家2分；
字符串gametype=“Single”；
addORSingleData（游戏类型，
text\u player1\u name.getText（）.toString（），
text\u player2\u name.getText（）.toString（），
分数
优胜者）；
AlertDialog repeatdialog=新建AlertDialog.Builder（此）
.setTitle（“游戏结束”）
.setMessage（“是否要重复游戏？”）
.setPositiveButton（“是”，新的DialogInterface.OnClickListener（）{
public void onClick（对话框接口对话框，int whichButton）{
球员1分=0分；
球员2分=0分；
重新创建（）；
}
})
.setNegativeButton（“否”，新的DialogInterface.OnClickListener（）{
public void onClick（DialogInterface dialog，int which）{
Intent i=新Intent（或_SingleCount.this，OneRoundMatch.class）；
i、 设置标志（意图、标志、活动、清除、顶部）；
星触觉（i）；
完成（）；
}
}).create（）；
repeatdialog.show（）；
}
public void addORSingleData（字符串游戏类型、字符串玩家1、字符串玩家2、字符串分数、字符串赢家）{
databaseHelper=新的databaseHelper（此）；
SQLiteDatabase db=databaseHelper.getWritableDatabase（）；
ContentValues ContentValues=新ContentValues（）；
contentValues.put（DatabaseHelper.TABLE1\u COLUMN2，游戏类型）；
contentValues.put（DatabaseHelper.TABLE1_COLUMN3，player1）；
contentValues.put（DatabaseHelper.TABLE1_COLUMN4，player2）；
contentValues.put（DatabaseHelper.TABLE1_COLUMN5，score）；
contentValues.put（DatabaseHelper.TABLE1_COLUMN6，winner）；
插入（DatabaseHelper.TABLE_1，null，contentValues）；
}
}

---

我的代码出了什么问题？

我从未使用过SQLite Studio，因此如果我想解决这个问题，我不会遇到麻烦，但您可以设置一个光标：

Cursor cursor = db.query(TABLE_NAME,null,null,null,null,null,null);

然后打电话

Toast.makeText(this, "" + cursor.getCount(), Toast.LENGTH_SHORT).show();

看看你