是否有一种方法,我们可以实现onBackPressed()在Android片段类似的方式,我们实现在Android活动?
因为Fragment的生命周期没有onBackPressed()。在android3.0片段中是否有其他替代方法来覆盖onBackPressed() ?
是否有一种方法,我们可以实现onBackPressed()在Android片段类似的方式,我们实现在Android活动?
因为Fragment的生命周期没有onBackPressed()。在android3.0片段中是否有其他替代方法来覆盖onBackPressed() ?
当前回答
我有同样的问题,我为它创建了一个新的侦听器,并在我的片段中使用。
1 -你的活动应该有一个监听器接口和一个监听器列表
你应该实现添加和删除监听器的方法
你应该重写onBackPressed方法来检查监听器是否使用了背按
public class MainActivity ... {
/**
* Back press listener list. Used for notifying fragments when onBackPressed called
*/
private Stack<BackPressListener> backPressListeners = new Stack<BackPressListener>();
...
/**
* Adding new listener to back press listener stack
* @param backPressListener
*/
public void addBackPressListener(BackPressListener backPressListener) {
backPressListeners.add(backPressListener);
}
/**
* Removing the listener from back press listener stack
* @param backPressListener
*/
public void removeBackPressListener(BackPressListener backPressListener) {
backPressListeners.remove(backPressListener);
}
// Overriding onBackPressed to check that is there any listener using this back press
@Override
public void onBackPressed() {
// checks if is there any back press listeners use this press
for(BackPressListener backPressListener : backPressListeners) {
if(backPressListener.onBackPressed()) return;
}
// if not returns in the loop, calls super onBackPressed
super.onBackPressed();
}
}
4 -你的片段必须实现接口的背压
5 -你需要添加片段作为背按的监听器
如果片段使用这个背压,你应该从onBackPressed返回true
7 -重要-你必须删除片段从列表onDestroy
public class MyFragment extends Fragment implements MainActivity.BackPressListener {
...
@Override
public void onAttach(Activity activity) {
super.onCreate(savedInstanceState);
// adding the fragment to listener list
((MainActivity) activity).addBackPressListener(this);
}
...
@Override
public void onDestroy() {
super.onDestroy();
// removing the fragment from the listener list
((MainActivity) getActivity()).removeBackPressListener(this);
}
...
@Override
public boolean onBackPressed() {
// you should check that if this fragment is the currently used fragment or not
// if this fragment is not used at the moment you should return false
if(!isThisFragmentVisibleAtTheMoment) return false;
if (isThisFragmentUsingBackPress) {
// do what you need to do
return true;
}
return false;
}
}
有一个Stack来代替ArrayList,以便能够从最新的片段开始。在向后台堆栈添加片段时也可能出现问题。所以你需要检查碎片是否可见,而使用背压。否则,其中一个片段将使用事件,并且最新的片段将不会在背按时关闭。
我希望这能解决所有人的问题。
其他回答
如果你使用EventBus,它可能是一个更简单的解决方案:
在你的片段中:
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
EventBus.getDefault().register(this);
}
@Override
public void onDetach() {
super.onDetach();
EventBus.getDefault().unregister(this);
}
// This method will be called when a MessageEvent is posted
public void onEvent(BackPressedMessage type){
getSupportFragmentManager().popBackStack();
}
在你的Activity类中你可以定义:
@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
@Override
public void onStop() {
EventBus.getDefault().unregister(this);
super.onStop();
}
// This method will be called when a MessageEvent is posted
public void onEvent(BackPressedMessage type){
super.onBackPressed();
}
@Override
public void onBackPressed() {
EventBus.getDefault().post(new BackPressedMessage(true));
}
java只是一个POJO对象
这是超级干净的,没有接口/实现的麻烦。
你可以像这样使用父活动的onBackPressedDispatcher:
val backpress = requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, true) {
// here dispatcher works for any action when back pressed
}
你也可以从fragment中启用/禁用backpress按钮,如下所示:
backpress.isEnabled = true/false
从你的片段,就用
requireActivity().onBackPressed();
请单击add binding.actionABack进行处理。setOnClickListener(v -> requireActivity().onBackPressed());
我是这样做的,对我很管用
简单的界面
FragmentOnBackClickInterface.java
public interface FragmentOnBackClickInterface {
void onClick();
}
示例实现
MyFragment.java
public class MyFragment extends Fragment implements FragmentOnBackClickInterface {
// other stuff
public void onClick() {
// what you want to call onBackPressed?
}
然后在activity中重写onBackPressed
@Override
public void onBackPressed() {
int count = getSupportFragmentManager().getBackStackEntryCount();
List<Fragment> frags = getSupportFragmentManager().getFragments();
Fragment lastFrag = getLastNotNull(frags);
//nothing else in back stack || nothing in back stack is instance of our interface
if (count == 0 || !(lastFrag instanceof FragmentOnBackClickInterface)) {
super.onBackPressed();
} else {
((FragmentOnBackClickInterface) lastFrag).onClick();
}
}
private Fragment getLastNotNull(List<Fragment> list){
for (int i= list.size()-1;i>=0;i--){
Fragment frag = list.get(i);
if (frag != null){
return frag;
}
}
return null;
}
使用导航组件,你可以这样做:
Java
public class MyFragment extends Fragment {
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This callback will only be called when MyFragment is at least Started.
OnBackPressedCallback callback = new OnBackPressedCallback(true /* enabled by default */) {
@Override
public void handleOnBackPressed() {
// Handle the back button event
}
});
requireActivity().getOnBackPressedDispatcher().addCallback(this, callback);
// The callback can be enabled or disabled here or in handleOnBackPressed()
}
...
}
科特林
class MyFragment : Fragment() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// This callback will only be called when MyFragment is at least Started.
val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {
// Handle the back button event
}
// The callback can be enabled or disabled here or in the lambda
}
...
}