正在尝试连接到数据库，上下文= null
正在尝试连接到数据库，上下文= null
提问于 2012-08-09 21:30:45
正在尝试连接数据库；我在context = null上遇到了问题(很可能是这样)。我不明白是什么问题
import java.util.HashMap;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
public class DatabaseTable extends Activity {
private Context context;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.database_table);
LBD conection = LBD.get(context); // (context = null) ???
Settings setting = new Settings(conection.getSQLiteDatabase());
setting.create();
}
}回答 3
Stack Overflow用户
回答已采纳
发布于 2012-08-09 21:36:02
试试这个-
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.database_table);
context = DatabaseTable.this; // you can give this instead of DatabaseTable.this also.
LBD conection = LBD.get(context); // (context = null) ???
Settings setting = new Settings(conection.getSQLiteDatabase());
setting.create();
}或者你可以像这样-
LBD conection = LBD.get(DatabaseTable.this); // from this you don't need to Create any context instance of Context class. Directly pass the context here.
Settings setting = new Settings(conection.getSQLiteDatabase());
setting.create();Stack Overflow用户
发布于 2012-08-09 21:33:20
context=this;//you forgot this...
LBD conection = LBD.get(context); // (context = null) ???
Settings setting = new Settings(conection.getSQLiteDatabase());
setting.create();Stack Overflow用户
发布于 2012-08-09 21:32:28
试试LBD conection = LBD.get(this);
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/11884586
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