如何启动活动并显示特定片段 [英] How to launch activity and show specific fragment

问题描述

我有一个MainActivity，其中添加了多个片段，然后将其显示/隐藏.这是因为MainActivity使用NavigationDrawer.单击抽屉中的项目会导致添加不同的片段(如果不存在)，或者添加/隐藏.

I have a MainActivity that has several fragments which are added and then shown/hidden. This is because the MainActivity uses a NavigationDrawer. Clicking on items in the drawer causes different fragments to be added (if they do not exist), or shown/hidden if they do.

我的问题是，如何才能通过来自其他活动的意图启动我的MainActivity，同时显示特定片段?

My question is, how can I launch my MainActivity via an intent from a different activity, and at the same time show a specific fragment?

我是否必须将一些额外内容传递给MainActivity，然后根据该数据添加/显示/隐藏相关片段?还有另一种方法吗?

Would I have to pass some extra to my MainActivity and then based on that data, add/show/hide the relevant fragment? Is there another way?

推荐答案

在创建Intent时，可以给它额外的内容来确定要加载的片段.

When you create your Intent, you can give it an extra that determines the fragment to load.

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

// Now start your activity
startActivity(i);

现在，在活动中检查额外内容并加载正确的片段:

Now, inside your activity check the extra and load the right Fragment:

OnCreate(){
    ...

    int intentFragment = getIntent().getExtras().getInt("frgToLoad");

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

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