无法解析符号getReadableDatabase

无法解析符号getReadableDatabase

我正在编写可能是创建游标的最简单程序,因此我可以演示查询。我陷入了错误“无法解析符号getReadableDatabase()”

PS:我已经准备好尝试使缓存无效并重新启动。

    package com.example.arjunrao.databasedemo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.View;
import android.database.Cursor;
import android.widget.EditText;

public class MainActivity extends Activity {

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

    }

    public void onclick(View view){
        EditText editText = (EditText) findViewById(R.id.editText);
         String drink_name = (String)editText.getText().toString();

        try{
            SQLiteOpenHelper database = new Database_class(this);
            SQLiteDatabase db = new database.getReadableDatabase();
            db.query("DRINK",new String[] {"NAME","DESCRIPTION","FAVORITE"});
        }catch(SQLiteException ex){
           final AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
            alertDialog.setTitle("SQLITE EXCEPTION GENERATED");
            alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    dialogInterface.dismiss();
                }
            });


        }

    }
}

最佳答案

必须是您代码中的new。更改此行:

SQLiteOpenHelper database = new Database_class(this);
SQLiteDatabase db = new database.getReadableDatabase();




SQLiteOpenHelper database = new Database_class(this);
SQLiteDatabase db = database.getReadableDatabase();


您的IDE应该指出了这个错误,但是您的代码应该已经建立了错误。

07-24 20:26