如何在两个不同活动类的片段之间切换 [英] how to switch between fragments of two different activity class

问题描述

我有两个不同的活动，即A&B．两者都具有 NavigationDrawer ，外观相似，但不同，因为我无法在活动B中获得活动A的抽屉布局ID.

I have two different activities, A & B. Both have NavigationDrawer , look alike, but not are the same, because I could not get the drawer layout ID of activity A in activity B.

两个活动均具有3个片段(共6个).

Both activity has 3 fragments each (total 6).

NavigationDrawer 仅包含活动类A的所有片段.我的问题是，当我处于活动B中并尝试从导航抽屉中打开活动A的一个片段时，会引发错误

The NavigationDrawer contains all fragments of activity class A only. My problem is, when I am in activity B, and try to open one fragment of activity A from navigation drawer, it throws an error

No view found for id 0x7f090047 (com.wlodsgn.bunbunup:id/linear) for fragment FmMenu{b1e537f0 #0 id=0x7f090047}

我该如何实现?

推荐答案

我在第二个活动中创建了一个意图，并使用有关要调用的片段的信息开始了活动A.

I have created an intent inside the second activity and started the activity A with information about the fragment to be called.

Intent i = new Intent(this, ActivityClass.class);
i.putExtra("frgToLoad", "FRAGMENT_A");
startActivity(i);

现在，在活动A中，检查了额外内容并加载了正确的片段:

Now, inside activity A, checked the extra and load the right Fragment:

OnCreate(){
...
if (getIntent().getExtras() != null) {
String intentFragment = getIntent().getExtras().getString("frgToLoad");

switch (intentFragment){
    case "FRAGMENT_A":
        // Load corresponding fragment
        break;
    case "FRAGMENT_B":
        // Load corresponding fragment
        break;
    case "FRAGMENT_C":
        // Load corresponding fragment
        break;
   }
}
}

在尝试为intentFragment赋值之前，必须检查intent是否为null.这是因为无论我是否来自活动B，都会调用该行代码，并且如果intent为null，它将引发错误.

One have to check if intent is null or not before I try to assign a value to intentFragment. This is because that line of code is called whether I am coming from activity B or not, and it will throw error if intent is null.

信用: https://stackoverflow.com/a/36064344/3380537

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