java.lang.IllegalStateException: commit already called详细解决办法

1、有问题的代码：

class LeftFrag extends Fragment{

private FragmentManager manager;
private FragmentTransaction transaction;

A(){

manager = getFragmentManager();
transaction = manager.beginTransaction();

}

void Fun(){

RightFrag rightFrag = new RightFrag();
transaction.replace(R.id.right, rightFrag, "rightfrag");
transaction.commit();

}

}

上面的写法就会报错：Java.lang.IllegalStateException: commit already called。如果在你一个类中已经使用一个成员变量transaction去调用了一次commit()方法，那么在其它外部类中就不能再使用一个成员变量transaction再次调用commit()方法。我当时出错是因为在Activity中加载了LeftFrag并在Activity中commit了一次。

2、解决办法

class LeftFrag extends Fragment{

A(){

manager = getFragmentManager();
transaction = manager.beginTransaction();

}

//解决办法也就是把manager和transaction定义为函数内部的局部变量

void Fun(){

private FragmentManager manager =getFragmentManager();
private FragmentTransaction transaction =manager.beginTransaction();

RightFrag rightFrag = new RightFrag();

transaction.replace(R.id.right, rightFrag, "rightfrag");
transaction.commit();

}

}