Android为什么我的checkDB一直给出错误？

Question

我想创建一个按钮，根据数据库是否存在切换到2个活动之一。我做了一个databasecheckhelper，但由于某种原因，即使数据库存在，它仍然会发出错误信息。

代码上点击按钮：

public void open_my_training(View view) { 

    Intent intent; 

    boolean databaseExists = checkDatabase.checkDB(this); 
    if(databaseExists){ 
     intent = new Intent(this, a.class); 
    }else{ 
     intent = new Intent(this, b.class); 
    } 
    startActivity(intent); 
} 

助手

public class checkDatabase { 

    public static boolean checkDB(Context context) { 
     File dbFile = context.getDatabasePath("database.db"); 
     return dbFile.exists(); 
    } 
} 

谁能告诉我什么，我做错了什么？

编辑：

因为代码似乎是罚款我加入我的代码创建数据库：

public void save_training(View view) { 

    CheckBox box1 = (CheckBox) findViewById(R.id.box1); 
    CheckBox box2 = (CheckBox) findViewById(R.id.box2); 


    Spinner spinner1 = (Spinner) findViewById(R.id.spinner1); 
    String spinner1 = spinner1.getSelectedItem().toString(); 

    createDatabase(); 
    addTraining(box1.isChecked(), box2.isChecked(), spinner1); 
} 


private void createDatabase() { 
    try { 

     trainingDB = this.openOrCreateDatabase("database.sqlite", MODE_PRIVATE, null); 

     trainingDB.execSQL("CREATE TABLE IF NOT EXISTS table1" + "(id integer primary key," + 
       "box1 boolean, box2 boolean, + "spinner1 VARCHAR);"); 

} 

private void addTraining(boolean box1Checked, boolean box2Checked, String spinner1) { 

    trainingDB.execSQL("INSERT INTO table1 (box1, box2, spinner1) VALUES ('"+ box1Checked + "', '" + 
      box2Checked + "', '" + spinner1 + "');"); 
} 

Answer 1

更换

File dbFile = context.getDatabasePath("database.sqlite");

，而不是

File dbFile = context.getDatabasePath("database.db");