I have added Fragment to Activity like

getSupportFragmentManager().beginTransaction()

.add(R.id.container,new MyFragment).commit();

其中container是FrameLayout的id

android:id="@+id/container"

android:layout_width="match_parent"

android:layout_height="match_parent" />

现在我怎样才能在Activity like this中获得Fragment的实例

从Fragment B获得结果后,我必须调用Fragment A的方法.

我在Fragment B中创建了一个接口,并在Activity.Now中实现了它.我必须将结果传递给Fragment A.我无法获得Fragment A的实例.

One thing i don’t wanna do is to create a private instance of Fragment A in Activity and call it’s method.

解决方法:

试试这个

getSupportFragmentManager().beginTransaction()

.add(R.id.container,new MyFragment(),"MyFragment").commit();

获取片段

MyFragment frag = ((MyFragment) getSupportFragmentManager().findFragmentByTag("MyFragment"));