1、 add(@IdRes int containerViewId, @NonNull Fragment fragment)
2、 replace(@IdRes int containerViewId, @NonNull Fragment fragment)
void doAddOp(int containerViewId, Fragment fragment, @Nullable String tag, int opcmd)
1、弹出当前Fragment页面
public void pop();
2、弹出到指定压栈页面（注意：如果Class没有，将退回栈顶）
public void popTo(Class clazz);
3、弹出到栈顶
public void popToTop();
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
//requireActivity() 返回的是宿主activity
requireActivity().getLifecycle().addObserver(new LifecycleEventObserver() {
@Override
public void onStateChanged(@NonNull LifecycleOwner source, @NonNull Lifecycle.Event event) {
if (event.getTargetState() == Lifecycle.State.CREATED){
//在这里任你飞翔
Log.i(">>>boylab>>>", "onStateChanged: 什么时候执行2");
mActivity = (BaseActivity) requireActivity();
initData();
requireActivity().getLifecycle().removeObserver(this); //这里是删除观察者
}
}
});
}
1、调用addForResult()、replaceForResult()两个方法，需要requestKey, FragmentResultListener两个参数，FragmentResultListener监听回调参数
public void addForResult(BaseFragment fragment, String requestKey, FragmentResultListener listener) {
mActivity.addForResult(fragment, requestKey, listener);
}
public void replaceForResult(BaseFragment fragment, String requestKey, FragmentResultListener listener) {
mActivity.replaceForResult(fragment, requestKey, listener);
}
2、返回之前，调用setFragmentResult()方法，通过requestKey回传参数
public void setFragmentResult(@NonNull String requestKey, @NonNull Bundle result)
3、特性：Fragment页面切换，可以做到跨多个页面，进行参数回调，且以回到页面前最后一次调用setFragmentResult()方法为准
1、在Fragment页面创建 ActivityResultLauncher 对象，
private ActivityResultLauncher activityLauncher = registerForActivityResult(new ResultContract(), new ActivityResultCallback<ResultContract.ResultBean>(){
@Override
public void onActivityResult(ResultContract.ResultBean result) {
//Log.i(">>>boylab>>>", "onActivityResult: result = "+result);
if (result != null){
text_Activity.setText(result.toString());
}
}
});
2、通过 ActivityResultLauncher 启动新Activity页面
Intent intent = new Intent(getContext(), SecondActivity.class);
activityLauncher.launch(intent);
3、特性：次方式只能进行两个页面之间数据回调，不能进行跨多页面回调
| 类型 | 方法 | 方法 |
|---|---|---|
| abstract ActivityResultContract<I, ?> |
getContract() | Get the {@link ActivityResultContract} that was used to create this launcher. |
| abstract void | unregister() | Unregisters this launcher, releasing the underlying result callback, and any references captured within it. |
| abstract void | launch(I input, ActivityOptionsCompat options) |
Executes an {@link ActivityResultContract}. |
| void | launch(I input) | Executes an {@link ActivityResultContract}. |
类型 方法 描述 Get the {@link ActivityResultContract} that was used to create this launcher. Unregisters this launcher, releasing the underlying result callback, and any references captured within it. Executes an {@link ActivityResultContract}. Executes an {@link ActivityResultContract}.
1、Activity 复写onActivityResult(),然后Activity分发并调用 Fragment中 onActivityResult()方法，
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
getmFragment().onActivityResult(requestCode, resultCode, data);
}
2、Fragment中的 onActivityResult() 用来处理Activity数据回调
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
3、在Fragment页面中， 通过承载Fragment的 Activity调用 startActivityForResult() 进行跳转
4、Fragment中的 startActivityForResult()、onActivityResult()都弃用了