如何在工具栏中为某些片段添加这个额外的图标

Question

I am making an android application which have a design like this:

https://imgur.com/R1JL7Na

So my design idea is that I will make a single Activity and all the screens will be Fragment type and I will do Fragment Transaction to change to screens or we can say fragments. This will keep same toolbar across all fragments . But some fragments, can say 4-5 fragments toolbar should have one extra icon. Like in below image.

https://imgur.com/a/LhP0irZ

The extra icon is filters icon. So how can I add this extra icon in toolbar for some fragments? Do I have to make an extra Activity with different toolbar layout ?

Please provide me some good way to achieve this

Answer 1

Every Fragment can has different menu.

In Fragment's onCreate method add this:

setHasOptionsMenu(true);

and after that override onCreateOptionsMenu callback in the Fragment .

Answer 2

In fragment

Intent intent = new Intent(context,Activity.class)
intent.putExtra("pin",pins);
System.out.println(pin);

In Activity

pined=getIntent().getStringExtra("pin");
System.out.println(pined);

Answer 3

在活动类的工具栏中放置一个显示/隐藏第三个按钮的方法，并在fragments访问您的activity ，并在每个fragment使用setUserVisibleHint ，您将知道要在哪个fragment上显示第三个按钮。

Answer 4

you can override onCreateOptionsMenu method in your class and override onOptionsItemSelected try

override fun onCreateOptionsMenu(menu: Menu?): Boolean {
     menuInflater.inflate(R.menu.demo,menu)
    return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return super.onOptionsItemSelected(item)