在android中从片段到片段管理工具栏的导航和后退按钮 [英] Manage toolbar's navigation and back button from fragment to fragment in android
问题描述
我所有的片段都是通过ActionBarActivity
(mainActivity)控制的,在mainActivity里面实现了一个DrawerLayout
并且所有子片段都通过 drawerLayout 的列表项点击推送.我面临的问题是通过 drawerLayout 推送片段后,我想将抽屉图标更改为 ToolBar
的后退图标,以便用户可以导航到上一个片段并处理 android.R 的回调.id.home 位于同一片段内或 mainActivity 内.
All of my fragments are controlled through ActionBarActivity
(mainActivity), inside mainActivity a DrawerLayout
is implemented and all the child fragments are pushed through drawerLayout's list item click. The problem that I'm facing is after pushing a fragment through drawerLayout I want to change the drawer icon into back icon of ToolBar
so that user can navigate to previous fragment and to handle the callback of android.R.id.home either inside the same fragment or inside the mainActivity.
推荐答案
您已经将 Fragment
添加到后台堆栈并像这样在片段管理器中添加 listener
You have add Fragment
to back stack and add listener in fragment manager like this
getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true); // show back button
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onBackPressed();
}
});
} else {
//show hamburger
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
toggle.syncState();
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
drawerLayout.openDrawer(GravityCompat.START);
}
});
}
}
});
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