Anroid 求解答代码中如何获取到抽象类的对象，从而调用抽象类中的方法。（急）

Question

public abstract class DataSource
{
protected static DataSource me;

public static DataSource getInstance()
{
if (me == null) {}
try
{
if (me == null) {
//下面这一行代码在Application中是空实现
MyApplication.getInstance().initDataSource();
}
return me;
}
finally {}
}
public abstract A getA();
}

在另一类中就能使用
DataSource.getInstance().getA()

Answer 1

http://www.zhihu.com/question/20174124