android.support.v4.app.Fragment#onResume ( )源码实例Demo

private void updateRoomListIfNeeded() {

        try {

            for (Fragment f : G.fragmentManager.getFragments()) {

                if (f == null) {
                    continue;
                }

                if (f instanceof FragmentMain || f instanceof FragmentCall) {
                    f.onResume();
                }
            }
        } catch (Exception e) {
            HelperLog.setErrorLog("fragment setting   updateRoomListIfNeeded    " + e.toString());
        }
    }
 

public void showFragment(String tag, boolean onresume) {
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag);
    if (fragment == null) {
        if (App.getInstance().getTabByTag(tag) != null) {
            TabItem tabItem = App.getInstance().getTabByTag(tag);
            addTab(tabItem.getTitle(), tabItem.getUrl(), tabItem.getFragment());
            return;
        }
        transaction.commitAllowingStateLoss();
        return;
    }
    if (onresume) fragment.onResume();
    transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN).show(fragment);
    transaction.commitAllowingStateLoss();
}
 

/**
 * A way to notify fragments when they become visible to user in this pager
 */
@Override
public void setPrimaryItem(ViewGroup container, int position, @NonNull Object object) {
    Fragment newPrimary = (Fragment) object;
    if(oldPrimary != newPrimary) {
        if(oldPrimary != null) {
            oldPrimary.setUserVisibleHint(false);
            oldPrimary.onPause();
        }

        newPrimary.setUserVisibleHint(true);
        newPrimary.onResume();

        oldPrimary = newPrimary;
    }
    super.setPrimaryItem(container, position, object);
}
 

@Override
public void onPageSelected(int position) {

    Fragment fragment = mSectionsPagerAdapter.getFragment(position);
    if (fragment != null) {
        fragment.onResume();
    }
}
 

@Override
public void onCheckedChanged(RadioGroup radioGroup, int checkId) {
    for (int i = 0; i < radioGroup.getChildCount(); i++) {
        if (radioGroup.getChildAt(i).getId() == checkId) {
            //  即将要展示的Fragment
            Fragment target = mFragmentList.get(i);
            Fragment currentFragment = getCurrentFragment();
            currentFragment.onPause();

            FragmentTransaction fragmentTransaction = getFragmentTransaction();
            if (target.isAdded()) {
                target.onResume();
                fragmentTransaction.show(target).hide(currentFragment);

            } else {
                fragmentTransaction.add(mContentId, target).show(target).hide(currentFragment);
            }
            fragmentTransaction.commit();
            currentTab = i;

            if (mFragmentToogleListener != null) {
                mFragmentToogleListener.onToogleChange(target, currentTab);
            }

        }
    }

}
 

@Override
protected void onPostResume() {
    super.onPostResume();
    activityPaused = false;
    if (App.getInstance().getCurrentFragmentTag() == null) {
        BrickInfo brickInfo = ListCore.getRegisteredBrick(Preferences.Lists.getLastSelectedList());
        if (brickInfo == null)
            brickInfo = new NewsPagerBrickInfo();
        selectItem(brickInfo);
    }
    if (tabOnIntent != null) {
        addTabToList(tabOnIntent.getTitle(), tabOnIntent.getUrl(), tabOnIntent.getTag(), tabOnIntent.getFragment(), true);
    }
    if (tabTagForRemove != null) {
        tryRemoveTab(tabTagForRemove, true);
    }
    tabTagForRemove = null;
    tabOnIntent = null;

    if (!(String.valueOf(App.getInstance().getCurrentFragmentTag())).equals("null")) {
        Fragment fragment = getSupportFragmentManager().findFragmentByTag(App.getInstance().getCurrentFragmentTag());
        if (fragment != null) {
            fragment.onResume();
        }
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        int[] ints = new int[2];
        appBarLayout.getLocationOnScreen(ints);
        if (statusBarHeight != ints[1] && ints[1] != 0)
            setStatusBarHeight.run();
    }
}
 

private void showFragment(FragmentTransaction transaction, String tag) {
    Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag);
    fragment.onResume();
    transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN).show(fragment);
}