工具类之FragmentUtils
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fragment应该是广大Android开发者都用到过的一个view，在此我整理了一个操作比较齐全的工具类，应该也是网上独一无二的，在此推荐我收集到的几篇fragment比较好的文章，Square：从今天开始抛弃Fragment吧！（当然我没让你们放弃它哈），还有就是YoKey的Fragment全解析系列，献上他的库Fragmentation。
Fragment相关
Fragment相关
addFragment : 新增fragmentaddFragments : 新增多个fragmentremoveFragment : 移除fragmentremoveToFragment : 移除到指定fragmentremoveFragments : 移除同级别fragmentremoveAllFragments : 移除所有fragmentreplaceFragment : 替换fragmentpopFragment : 出栈fragmentpopToFragment : 出栈到指定fragmentpopFragments : 出栈同级别fragmentpopAllFragments : 出栈所有fragmentpopAddFragment : 先出栈后新增fragmenthideFragment : 隐藏fragmenthideFragments : 隐藏同级别fragmentshowFragment : 显示fragmenthideShowFragment : 先隐藏后显示fragmentgetLastAddFragment : 获取同级别最后加入的fragmentgetLastAddFragmentInStack: 获取栈中同级别最后加入的fragmentgetTopShowFragment : 获取顶层可见fragmentgetTopShowFragmentInStack: 获取栈中顶层可见fragmentgetFragments : 获取同级别fragmentgetFragmentsInStack : 获取栈中同级别fragmentgetAllFragments : 获取所有fragmentgetAllFragmentsInStack : 获取栈中所有fragmentgetPreFragment : 获取目标fragment的前一个fragmentfindFragment : 查找fragmentdispatchBackPress : 处理fragment回退键setBackgroundColor : 设置背景色setBackgroundResource : 设置背景资源setBackground : 设置背景
import android.graphics.drawable.Drawable;import android.os.Build;import android.os.Bundle;import android.support.annotation.ColorInt;import android.support.annotation.DrawableRes;import android.support.annotation.NonNull;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.View;import java.util.ArrayList;import java.util.Collections;import java.util.List;/** * <pre> * author: Blankj * blog : http://blankj.com * time : 2017/1/17 * desc : Fragment相关工具类 * </pre> */public class FragmentUtils { private FragmentUtils() { throw new UnsupportedOperationException("u can't instantiate me..."); } private static final int TYPE_ADD_FRAGMENT = 0x01; private static final int TYPE_REMOVE_FRAGMENT = 0x01 << 1; private static final int TYPE_REMOVE_TO_FRAGMENT = 0x01 << 2; private static final int TYPE_REPLACE_FRAGMENT = 0x01 << 3; private static final int TYPE_POP_ADD_FRAGMENT = 0x01 << 4; private static final int TYPE_HIDE_FRAGMENT = 0x01 << 5; private static final int TYPE_SHOW_FRAGMENT = 0x01 << 6; private static final int TYPE_HIDE_SHOW_FRAGMENT = 0x01 << 7; private static final String ARGS_ID = "args_id"; private static final String ARGS_IS_HIDE = "args_is_hide"; private static final String ARGS_IS_ADD_STACK = "args_is_add_stack"; /** * 新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @return fragment */ public static Fragment addFragment(@NonNull FragmentManager fragmentManager, @NonNull Fragment fragment, int containerId) { return addFragment(fragmentManager, fragment, containerId, false); } /** * 新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isHide 是否显示 * @return fragment */ public static Fragment addFragment(@NonNull FragmentManager fragmentManager, @NonNull Fragment fragment, int containerId, boolean isHide) { return addFragment(fragmentManager, fragment, containerId, isHide, false); } /** * 新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isHide 是否显示 * @param isAddStack 是否入回退栈 * @return fragment */ public static Fragment addFragment(@NonNull FragmentManager fragmentManager, @NonNull Fragment fragment, int containerId, boolean isHide, boolean isAddStack) { putArgs(fragment, new Args(containerId, isHide, isAddStack)); return operateFragment(fragmentManager, null, fragment, TYPE_ADD_FRAGMENT); } /** * 新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isAddStack 是否入回退栈 * @param sharedElement 共享元素 * @return fragment */ public static Fragment addFragment(@NonNull FragmentManager fragmentManager, @NonNull Fragment fragment, int containerId, boolean isAddStack, SharedElement... sharedElement) { putArgs(fragment, new Args(containerId, false, isAddStack)); return operateFragment(fragmentManager, null, fragment, TYPE_ADD_FRAGMENT, sharedElement); } /** * 新增多个fragment * * @param fragmentManager fragment管理器 * @param fragments fragments * @param showIndex 要显示的fragment索引 * @param containerId 布局Id * @return fragment */ public static Fragment addFragments(@NonNull FragmentManager fragmentManager, @NonNull List<Fragment> fragments, int showIndex, int containerId) { for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) { putArgs(fragment, new Args(containerId, showIndex != i, false)); operateFragment(fragmentManager, null, fragment, TYPE_ADD_FRAGMENT); } } return fragments.get(showIndex); } /** * 移除fragment * * @param fragment fragment */ public static void removeFragment(@NonNull Fragment fragment) { operateFragment(fragment.getFragmentManager(), null, fragment, TYPE_REMOVE_FRAGMENT); } /** * 移除到指定fragment * * @param fragment fragment * @param isIncludeSelf 是否包括Fragment类自己 */ public static void removeToFragment(@NonNull Fragment fragment, boolean isIncludeSelf) { operateFragment(fragment.getFragmentManager(), isIncludeSelf ? fragment : null, fragment, TYPE_REMOVE_TO_FRAGMENT); } /** * 移除同级别fragment */ public static void removeFragments(@NonNull FragmentManager fragmentManager) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) removeFragment(fragment); } } /** * 移除所有fragment */ public static void removeAllFragments(@NonNull FragmentManager fragmentManager) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) { removeAllFragments(fragment.getChildFragmentManager()); removeFragment(fragment); } } } /** * 替换fragment * * @param srcFragment 源fragment * @param destFragment 目标fragment * @param isAddStack 是否入回退栈 * @return 目标fragment */ public static Fragment replaceFragment(@NonNull Fragment srcFragment, @NonNull Fragment destFragment, boolean isAddStack) { if (srcFragment.getArguments() == null) return null; int containerId = srcFragment.getArguments().getInt(ARGS_ID); if (containerId == 0) return null; return replaceFragment(srcFragment.getFragmentManager(), containerId, destFragment, isAddStack); } /** * 替换fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isAddStack 是否入回退栈 * @return fragment */ public static Fragment replaceFragment(@NonNull FragmentManager fragmentManager, int containerId, @NonNull Fragment fragment, boolean isAddStack) { putArgs(fragment, new Args(containerId, false, isAddStack)); return operateFragment(fragmentManager, null, fragment, TYPE_REPLACE_FRAGMENT); } /** * 出栈fragment * * @param fragmentManager fragment管理器 * @return {@code true}: 出栈成功<br>{@code false}: 出栈失败 */ public static boolean popFragment(@NonNull FragmentManager fragmentManager) { return fragmentManager.popBackStackImmediate(); } /** * 出栈到指定fragment * * @param fragmentManager fragment管理器 * @param fragmentClass Fragment类 * @param isIncludeSelf 是否包括Fragment类自己 * @return {@code true}: 出栈成功<br>{@code false}: 出栈失败 */ public static boolean popToFragment(@NonNull FragmentManager fragmentManager, Class<? extends Fragment> fragmentClass, boolean isIncludeSelf) { return fragmentManager.popBackStackImmediate(fragmentClass.getName(), isIncludeSelf ? FragmentManager.POP_BACK_STACK_INCLUSIVE : 0); } /** * 出栈同级别fragment * * @param fragmentManager fragment管理器 */ public static void popFragments(@NonNull FragmentManager fragmentManager) { while (fragmentManager.getBackStackEntryCount() > 0) { fragmentManager.popBackStackImmediate(); } } /** * 出栈所有fragment * * @param fragmentManager fragment管理器 */ public static void popAllFragments(@NonNull FragmentManager fragmentManager) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) popAllFragments(fragment.getChildFragmentManager()); } while (fragmentManager.getBackStackEntryCount() > 0) { fragmentManager.popBackStackImmediate(); } } /** * 先出栈后新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isAddStack 是否入回退栈 * @return fragment */ public static Fragment popAddFragment(@NonNull FragmentManager fragmentManager, int containerId, @NonNull Fragment fragment, boolean isAddStack, SharedElement... sharedElement) { putArgs(fragment, new Args(containerId, false, isAddStack)); return operateFragment(fragmentManager, null, fragment, TYPE_POP_ADD_FRAGMENT, sharedElement); } /** * 先出栈后新增fragment * * @param fragmentManager fragment管理器 * @param containerId 布局Id * @param fragment fragment * @param isAddStack 是否入回退栈 * @return fragment */ public static Fragment popAddFragment(@NonNull FragmentManager fragmentManager, int containerId, @NonNull Fragment fragment, boolean isAddStack) { putArgs(fragment, new Args(containerId, false, isAddStack)); return operateFragment(fragmentManager, null, fragment, TYPE_POP_ADD_FRAGMENT); } /** * 隐藏fragment * * @param fragment fragment * @return 隐藏的Fragment */ public static Fragment hideFragment(@NonNull Fragment fragment) { Args args = getArgs(fragment); if (args != null) { putArgs(fragment, new Args(args.id, true, args.isAddStack)); } return operateFragment(fragment.getFragmentManager(), null, fragment, TYPE_HIDE_FRAGMENT); } /** * 隐藏同级别fragment * * @param fragmentManager fragment管理器 */ public static void hideFragments(@NonNull FragmentManager fragmentManager) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) hideFragment(fragment); } } /** * 显示fragment * * @param fragment fragment * @return show的Fragment */ public static Fragment showFragment(@NonNull Fragment fragment) { Args args = getArgs(fragment); if (args != null) { putArgs(fragment, new Args(args.id, false, args.isAddStack)); } return operateFragment(fragment.getFragmentManager(), null, fragment, TYPE_SHOW_FRAGMENT); } /** * 先隐藏后显示fragment * * @param hideFragment 需要隐藏的Fragment * @param showFragment 需要显示的Fragment * @return 显示的Fragment */ public static Fragment hideShowFragment(@NonNull Fragment hideFragment, @NonNull Fragment showFragment) { Args args = getArgs(hideFragment); if (args != null) { putArgs(hideFragment, new Args(args.id, true, args.isAddStack)); } args = getArgs(showFragment); if (args != null) { putArgs(showFragment, new Args(args.id, false, args.isAddStack)); } return operateFragment(showFragment.getFragmentManager(), hideFragment, showFragment, TYPE_HIDE_SHOW_FRAGMENT); } /** * 传参 * * @param fragment fragment * @param args 参数 */ private static void putArgs(@NonNull Fragment fragment, Args args) { Bundle bundle = fragment.getArguments(); if (bundle == null) { bundle = new Bundle(); fragment.setArguments(bundle); } bundle.putInt(ARGS_ID, args.id); bundle.putBoolean(ARGS_IS_HIDE, args.isHide); bundle.putBoolean(ARGS_IS_ADD_STACK, args.isAddStack); } /** * 获取参数 * * @param fragment fragment */ private static Args getArgs(@NonNull Fragment fragment) { Bundle bundle = fragment.getArguments(); if (bundle == null || bundle.getInt(ARGS_ID) == 0) return null; return new Args(bundle.getInt(ARGS_ID), bundle.getBoolean(ARGS_IS_HIDE), bundle.getBoolean(ARGS_IS_ADD_STACK)); } /** * 操作fragment * * @param fragmentManager fragment管理器 * @param srcFragment 源fragment * @param destFragment 目标fragment * @param type 操作类型 * @param sharedElements 共享元素 * @return destFragment */ private static Fragment operateFragment(@NonNull FragmentManager fragmentManager, Fragment srcFragment, @NonNull Fragment destFragment, int type, SharedElement... sharedElements) { if (srcFragment == destFragment) return null; if (srcFragment != null && srcFragment.isRemoving()) { LogUtils.e(srcFragment.getClass().getName() + " is isRemoving"); return null; } String name = destFragment.getClass().getName(); Bundle args = destFragment.getArguments(); FragmentTransaction ft = fragmentManager.beginTransaction(); if (sharedElements == null || sharedElements.length == 0) { ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); } else { for (SharedElement element : sharedElements) {// 添加共享元素动画 ft.addSharedElement(element.sharedElement, element.name); } } switch (type) { case TYPE_ADD_FRAGMENT: ft.add(args.getInt(ARGS_ID), destFragment, name); if (args.getBoolean(ARGS_IS_HIDE)) ft.hide(destFragment); if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name); break; case TYPE_REMOVE_FRAGMENT: ft.remove(destFragment); break; case TYPE_REMOVE_TO_FRAGMENT: List<Fragment> fragments = getFragments(fragmentManager); for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment == destFragment) { if (srcFragment != null) ft.remove(fragment); break; } ft.remove(fragment); } break; case TYPE_REPLACE_FRAGMENT: ft.replace(args.getInt(ARGS_ID), destFragment, name); if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name); break; case TYPE_POP_ADD_FRAGMENT: popFragment(fragmentManager); ft.add(args.getInt(ARGS_ID), destFragment, name); if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name); break; case TYPE_HIDE_FRAGMENT: ft.hide(destFragment); break; case TYPE_SHOW_FRAGMENT: ft.show(destFragment); break; case TYPE_HIDE_SHOW_FRAGMENT: ft.hide(srcFragment).show(destFragment); break; } ft.commitAllowingStateLoss(); return destFragment; } /** * 获取同级别最后加入的fragment * * @param fragmentManager fragment管理器 * @return 最后加入的fragment */ public static Fragment getLastAddFragment(@NonNull FragmentManager fragmentManager) { return getLastAddFragmentIsInStack(fragmentManager, false); } /** * 获取栈中同级别最后加入的fragment * * @param fragmentManager fragment管理器 * @return 最后加入的fragment */ public static Fragment getLastAddFragmentInStack(@NonNull FragmentManager fragmentManager) { return getLastAddFragmentIsInStack(fragmentManager, true); } /** * 根据栈参数获取同级别最后加入的fragment * * @param fragmentManager fragment管理器 * @param isInStack 是否是栈中的 * @return 栈中最后加入的fragment */ private static Fragment getLastAddFragmentIsInStack(@NonNull FragmentManager fragmentManager, boolean isInStack) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return null; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) { if (isInStack) { if (fragment.getArguments().getBoolean(ARGS_IS_ADD_STACK)) { return fragment; } } else { return fragment; } } } return null; } /** * 获取顶层可见fragment * * @param fragmentManager fragment管理器 * @return 顶层可见fragment */ public static Fragment getTopShowFragment(@NonNull FragmentManager fragmentManager) { return getTopShowFragmentIsInStack(fragmentManager, null, false); } /** * 获取栈中顶层可见fragment * * @param fragmentManager fragment管理器 * @return 栈中顶层可见fragment */ public static Fragment getTopShowFragmentInStack(@NonNull FragmentManager fragmentManager) { return getTopShowFragmentIsInStack(fragmentManager, null, true); } /** * 根据栈参数获取顶层可见fragment * * @param fragmentManager fragment管理器 * @param parentFragment 父fragment * @param isInStack 是否是栈中的 * @return 栈中顶层可见fragment */ private static Fragment getTopShowFragmentIsInStack(@NonNull FragmentManager fragmentManager, Fragment parentFragment, boolean isInStack) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return parentFragment; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null && fragment.isResumed() && fragment.isVisible() && fragment.getUserVisibleHint()) { if (isInStack) { if (fragment.getArguments().getBoolean(ARGS_IS_ADD_STACK)) { return getTopShowFragmentIsInStack(fragment.getChildFragmentManager(), fragment, true); } } else { return getTopShowFragmentIsInStack(fragment.getChildFragmentManager(), fragment, false); } } } return parentFragment; } /** * 获取同级别fragment * * @param fragmentManager fragment管理器 * @return 同级别的fragments */ public static List<Fragment> getFragments(@NonNull FragmentManager fragmentManager) { return getFragmentsIsInStack(fragmentManager, false); } /** * 获取栈中同级别fragment * * @param fragmentManager fragment管理器 * @return 栈中同级别fragment */ public static List<Fragment> getFragmentsInStack(@NonNull FragmentManager fragmentManager) { return getFragmentsIsInStack(fragmentManager, true); } /** * 根据栈参数获取同级别fragment * * @param fragmentManager fragment管理器 * @param isInStack 是否是栈中的 * @return 栈中同级别fragment */ private static List<Fragment> getFragmentsIsInStack(@NonNull FragmentManager fragmentManager, boolean isInStack) { List<Fragment> fragments = fragmentManager.getFragments(); if (fragments == null || fragments.isEmpty()) return Collections.emptyList(); List<Fragment> result = new ArrayList<>(); for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) { if (isInStack) { if (fragment.getArguments().getBoolean(ARGS_IS_ADD_STACK)) { result.add(fragment); } } else { result.add(fragment); } } } return result; } /** * 获取所有fragment * * @param fragmentManager fragment管理器 * @return 所有fragment */ public static List<FragmentNode> getAllFragments(@NonNull FragmentManager fragmentManager) { return getAllFragmentsIsInStack(fragmentManager, new ArrayList<FragmentNode>(), false); } /** * 获取栈中所有fragment * * @param fragmentManager fragment管理器 * @return 所有fragment */ public static List<FragmentNode> getAllFragmentsInStack(@NonNull FragmentManager fragmentManager) { return getAllFragmentsIsInStack(fragmentManager, new ArrayList<FragmentNode>(), true); } /** * 根据栈参数获取所有fragment * <p>需之前对fragment的操作都借助该工具类</p> * * @param fragmentManager fragment管理器 * @param result 结果 * @param isInStack 是否是栈中的 * @return 栈中所有fragment */ private static List<FragmentNode> getAllFragmentsIsInStack(@NonNull FragmentManager fragmentManager, List<FragmentNode> result, boolean isInStack) { List<Fragment> fragments = fragmentManager.getFragments(); if (fragments == null || fragments.isEmpty()) return Collections.emptyList(); for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null) { if (isInStack) { if (fragment.getArguments().getBoolean(ARGS_IS_ADD_STACK)) { result.add(new FragmentNode(fragment, getAllFragmentsIsInStack(fragment.getChildFragmentManager(), new ArrayList<FragmentNode>(), true))); } } else { result.add(new FragmentNode(fragment, getAllFragmentsIsInStack(fragment.getChildFragmentManager(), new ArrayList<FragmentNode>(), false))); } } } return result; } /** * 获取目标fragment的前一个fragment * * @param destFragment 目标fragment * @return 目标fragment的前一个fragment */ public static Fragment getPreFragment(@NonNull Fragment destFragment) { FragmentManager fragmentManager = destFragment.getFragmentManager(); if (fragmentManager == null) return null; List<Fragment> fragments = getFragments(fragmentManager); boolean flag = false; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (flag && fragment != null) { return fragment; } if (fragment == destFragment) { flag = true; } } return null; } /** * 查找fragment * * @param fragmentManager fragment管理器 * @param fragmentClass fragment类 * @return 查找到的fragment */ public static Fragment findFragment(@NonNull FragmentManager fragmentManager, Class<? extends Fragment> fragmentClass) { List<Fragment> fragments = getFragments(fragmentManager); if (fragments.isEmpty()) return null; return fragmentManager.findFragmentByTag(fragmentClass.getName()); } /** * 处理fragment回退键 * <p>如果fragment实现了OnBackClickListener接口，返回{@code true}: 表示已消费回退键事件，反之则没消费</p> * <p>具体示例见FragmentActivity</p> * * @param fragment fragment * @return 是否消费回退事件 */ public static boolean dispatchBackPress(@NonNull Fragment fragment) { return dispatchBackPress(fragment.getFragmentManager()); } /** * 处理fragment回退键 * <p>如果fragment实现了OnBackClickListener接口，返回{@code true}: 表示已消费回退键事件，反之则没消费</p> * <p>具体示例见FragmentActivity</p> * * @param fragmentManager fragment管理器 * @return 是否消费回退事件 */ public static boolean dispatchBackPress(@NonNull FragmentManager fragmentManager) { List<Fragment> fragments = fragmentManager.getFragments(); if (fragments == null || fragments.isEmpty()) return false; for (int i = fragments.size() - 1; i >= 0; --i) { Fragment fragment = fragments.get(i); if (fragment != null && fragment.isResumed() && fragment.isVisible() && fragment.getUserVisibleHint() && fragment instanceof OnBackClickListener && ((OnBackClickListener) fragment).onBackClick()) { return true; } } return false; } /** * 设置背景色 * * @param fragment fragment * @param color 背景色 */ public static void setBackgroundColor(@NonNull Fragment fragment, @ColorInt int color) { View view = fragment.getView(); if (view != null) { view.setBackgroundColor(color); } } /** * 设置背景资源 * * @param fragment fragment * @param resId 资源Id */ public static void setBackgroundResource(@NonNull Fragment fragment, @DrawableRes int resId) { View view = fragment.getView(); if (view != null) { view.setBackgroundResource(resId); } } /** * 设置背景 * * @param fragment fragment * @param background 背景 */ public static void setBackground(@NonNull Fragment fragment, Drawable background) { View view = fragment.getView(); if (view != null) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { view.setBackground(background); } else { view.setBackgroundDrawable(background); } } } static class Args { int id; boolean isHide; boolean isAddStack; Args(int id, boolean isHide, boolean isAddStack) { this.id = id; this.isHide = isHide; this.isAddStack = isAddStack; } } public static class SharedElement { View sharedElement; String name; public SharedElement(View sharedElement, String name) { this.sharedElement = sharedElement; this.name = name; } } static class FragmentNode { Fragment fragment; List<FragmentNode> next; public FragmentNode(Fragment fragment, List<FragmentNode> next) { this.fragment = fragment; this.next = next; } @Override public String toString() { return fragment.getClass().getSimpleName() + "->" + ((next == null || next.isEmpty()) ? "no child" : next.toString()); } } public interface OnBackClickListener { boolean onBackClick(); }} 0 0
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