如何从sqlite数据库的表中删除用户信息？

如何解决如何从sqlite数据库的表中删除用户信息？

我正在尝试在管理员输入用户名然后单击删除按钮时删除用户，这将从数据库中删除所有用户信息（用户名，密码，用户号码，地址，电话），我对此非常陌生我可能做的事情完全错误，但是当我尝试执行此操作时，该应用程序将注销。我的代码中没有错误，所以我对自己做错了感到困惑。任何有关做什么的帮助或指导都将对我有很大帮助，我将不胜感激。

DatabaseHelperUser类：

public class DatabaseHelperUser extends sqliteOpenHelper {

public static final String DATABASE_NAME = "User.db";
public static final String TABLE_NAME = "User_table";
public static final String COL1 = "UserNum";
public static final String COL2 = "UserName";
public static final String COL3 = "Password";
public static final String COL4 = "BirthDate";
public static final String COL5 = "Phone";
public static final String COL6 = "Address";


public DatabaseHelperUser(Context context) {
    super(context,DATABASE_NAME,null,1);
}


@Override
public void onCreate(sqliteDatabase db) {

    db.execsql("create table " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT,UserNum TEXT,UserName Text,Password Text,BirthDate Text,Phone Text,Address Text)");

}

@Override
public void onUpgrade(sqliteDatabase db,int i,int i1) {

    db.execsql("DROP TABLE IF EXISTS " + TABLE_NAME);
    onCreate(db);
}

public Cursor getData() {
    sqliteDatabase db = this.getWritableDatabase();
    Cursor res = db.rawQuery("select * from " + TABLE_NAME,null);
    return res;
}

public Integer deleteData(String UserName) {
    sqliteDatabase db = this.getWritableDatabase();
    return db.delete(TABLE_NAME,"UserName = ?",new String[]{UserName});



}

}

RemoveUser类：公共类RemoveUser扩展了AppCompatActivity {

Button btdelete;
EditText txtUser;

DatabaseHelperUser myDb;

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

    btdelete = (Button) findViewById(R.id.buttonRemove1);
    txtUser = (EditText) findViewById(R.id.etxtUserName);

    myDb = new DatabaseHelperUser(this);

    DeleteData();

}
public void DeleteData(){
    btdelete.setonClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Integer deleteRows = myDb.deleteData(txtUser.getText().toString());
            if(deleteRows > 0 )
                Toast.makeText(RemoveUser.this,"Data Deleted",Toast.LENGTH_LONG).show();
            else
                Toast.makeText(RemoveUser.this,"Data has not been Deleted",Toast.LENGTH_LONG).show();

        }
    });
}
}