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怎么在Android中利用FragmentTabHost实现一个底部菜单功能?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
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FragmentTabHost简单介绍
首先我们看下官方文档的介绍
OK,接着官方还给出了一份使用的代码,我们也来看下
Activity中使用
import com.example.android.supportv4.R; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTabHost; /** * This demonstrates how you can implement switching between the tabs of a * TabHost through fragments, using FragmentTabHost. */ public class FragmentTabs extends FragmentActivity { private FragmentTabHost mTabHost; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_tabs); mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost); mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"), FragmentStackSupport.CountingFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"), LoaderCursorSupport.CursorLoaderListFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"), LoaderCustomSupport.AppListFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"), LoaderThrottleSupport.ThrottledLoaderListFragment.class, null); } }
Fragment中使用
import com.example.android.supportv4.R; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTabHost; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class FragmentTabsFragmentSupport extends Fragment { private FragmentTabHost mTabHost; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mTabHost = new FragmentTabHost(getActivity()); mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.fragment1); mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"), FragmentStackSupport.CountingFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"), LoaderCursorSupport.CursorLoaderListFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"), LoaderCustomSupport.AppListFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"), LoaderThrottleSupport.ThrottledLoaderListFragment.class, null); return mTabHost; } @Override public void onDestroyView() { super.onDestroyView(); mTabHost = null; } }
FragmentTabHost 布局问题
官方在给出例子的时候,并没有贴出对应的布局文件,这个布局文件有一些要求,所以我就把我自己写的贴出来吧,方便大家观看
这里要注意以下几点:
1.我自己自定义了一个FragmentTabHost,因为原来的FragmentTabHost每次切换Fragment事都会走一遍onCreateView()和onResume()方法;
2.id必须是android:id=”@android:id/tabhost”这个;
3.里面的FrameLayout的id必须是android:id=”@android:id/tabcontent”
FragmentTabHost 使用
下面就到了具体使用的过程了
1.定义Tab类
因为它属于Tab的一个组合吧,里面包含好多个Tab,所以我们先定义一个Tab类
/** * 主页TAB对应实体 * Created by HFS on 2017/5/7. */ public class Tab { private int title; // 文字 private int icon; // 图标 private Class fragment; // 对应fragment public Tab(Class fragment,int title, int icon ) { this.title = title; this.icon = icon; this.fragment = fragment; } public int getTitle() { return title; } public void setTitle(int title) { this.title = title; } public int getIcon() { return icon; } public void setIcon(int icon) { this.icon = icon; } public Class getFragment() { return fragment; } public void setFragment(Class fragment) { this.fragment = fragment; } }
这里面要对应相应的Fragment,所以需要一个Fragment对象
2.初始化Tab集合
有几个Tab就往Tab集合添加几个Tab
Tab tab_home = new Tab(HomeFragment.class,R.string.home,R.drawable.selector_icon_home); Tab tab_hot = new Tab(HotFragment.class,R.string.hot,R.drawable.selector_icon_hot); Tab tab_category = new Tab(CategoryFragment.class,R.string.catagory,R.drawable.selector_icon_category); Tab tab_cart = new Tab(CartFragment.class,R.string.cart,R.drawable.selector_icon_cart); Tab tab_mine = new Tab(MineFragment.class,R.string.mine,R.drawable.selector_icon_mine); mTabs.add(tab_home); mTabs.add(tab_hot); mTabs.add(tab_category); mTabs.add(tab_cart); mTabs.add(tab_mine);
3.setUp
找到该控件之后,就要调用对应的这个方法
mInflater = LayoutInflater.from(this); mTabhost = (FragmentTabHost) this.findViewById(android.R.id.tabhost); mTabhost.setup(this,getSupportFragmentManager(),R.id.flayout_content);
4.添加TabSpec
到这一步就要添加TabSpec了,有几个Tab,就添加几个TabSpec
for (Tab tab : mTabs){ TabHost.TabSpec tabSpec = mTabhost.newTabSpec(getString(tab.getTitle())); tabSpec.setIndicator(buildIndicator(tab)); mTabhost.addTab(tabSpec,tab.getFragment(),null); } //构建Indicator private View buildIndicator(Tab tab){ View view =mInflater.inflate(R.layout.tab_indicator,null); ImageView img = (ImageView) view.findViewById(R.id.icon_tab); TextView text = (TextView) view.findViewById(R.id.txt_indicator); img.setBackgroundResource(tab.getIcon()); text.setText(tab.getTitle()); return view; }
5.设置默认显示第一个
mTabhost.setCurrentTab(0);
6.设置没有分割线
mTabhost.getTabWidget().setShowDividers(LinearLayout.SHOW_DIVIDER_NONE);
自定义FragmentTabHost类
package com.study.buttomtabdemo.widget; /** * Created by monkey * on 2014/9/24 * 功能描述:修改过的FragmentTabHost,保存fragment实例不销毁 */ /* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.ArrayList; import android.content.Context; import android.content.res.TypedArray; import android.os.Bundle; import android.os.Parcel; import android.os.Parcelable; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.TabHost; import android.widget.TabWidget; /** * Special TabHost that allows the use of {@link Fragment} objects for its tab * content. When placing this in a view hierarchy, after inflating the hierarchy * you must call {@link #setup(Context, FragmentManager, int)} to complete the * initialization of the tab host. * ** Here is a simple example of using a FragmentTabHost in an Activity: * * {@sample * development/samples/Support4Demos/src/com/example/android/supportv4/app/ * FragmentTabs.java complete} * *
* This can also be used inside of a fragment through fragment nesting: * * {@sample * development/samples/Support4Demos/src/com/example/android/supportv4/app/ * FragmentTabsFragmentSupport.java complete} */ public class FragmentTabHost extends TabHost implements TabHost.OnTabChangeListener { private final ArrayList
mTabs = new ArrayList (); private FrameLayout mRealTabContent; private Context mContext; private FragmentManager mFragmentManager; private int mContainerId; private OnTabChangeListener mOnTabChangeListener; private TabInfo mLastTab; private boolean mAttached; static final class TabInfo { private final String tag; private final Class> clss; private final Bundle args; private Fragment fragment; TabInfo(String _tag, Class> _class, Bundle _args) { tag = _tag; clss = _class; args = _args; } } static class DummyTabFactory implements TabContentFactory { private final Context mContext; public DummyTabFactory(Context context) { mContext = context; } @Override public View createTabContent(String tag) { View v = new View(mContext); v.setMinimumWidth(0); v.setMinimumHeight(0); return v; } } static class SavedState extends BaseSavedState { String curTab; SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); curTab = in.readString(); } @Override public void writeToParcel(Parcel out, int flags) { super.writeToParcel(out, flags); out.writeString(curTab); } @Override public String toString() { return "FragmentTabHost.SavedState{" + Integer.toHexString(System.identityHashCode(this)) + " curTab=" + curTab + "}"; } public static final Creator CREATOR = new Creator () { public SavedState createFromParcel(Parcel in) { return new SavedState(in); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; } public FragmentTabHost(Context context) { // Note that we call through to the version that takes an AttributeSet, // because the simple Context construct can result in a broken object! super(context, null); initFragmentTabHost(context, null); } public FragmentTabHost(Context context, AttributeSet attrs) { super(context, attrs); initFragmentTabHost(context, attrs); } private void initFragmentTabHost(Context context, AttributeSet attrs) { TypedArray a = context.obtainStyledAttributes(attrs, new int[] { android.R.attr.inflatedId }, 0, 0); mContainerId = a.getResourceId(0, 0); a.recycle(); super.setOnTabChangedListener(this); } private void ensureHierarchy(Context context) { // If owner hasn't made its own view hierarchy, then as a convenience // we will construct a standard one here. if (findViewById(android.R.id.tabs) == null) { LinearLayout ll = new LinearLayout(context); ll.setOrientation(LinearLayout.VERTICAL); addView(ll, new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); TabWidget tw = new TabWidget(context); tw.setId(android.R.id.tabs); tw.setOrientation(TabWidget.HORIZONTAL); ll.addView(tw, new LinearLayout.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0)); FrameLayout fl = new FrameLayout(context); fl.setId(android.R.id.tabcontent); ll.addView(fl, new LinearLayout.LayoutParams(0, 0, 0)); mRealTabContent = fl = new FrameLayout(context); mRealTabContent.setId(mContainerId); ll.addView(fl, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, 0, 1)); } } /** * @deprecated Don't call the original TabHost setup, you must instead call * {@link #setup(Context, FragmentManager)} or * {@link #setup(Context, FragmentManager, int)}. */ @Override @Deprecated public void setup() { throw new IllegalStateException( "Must call setup() that takes a Context and FragmentManager"); } public void setup(Context context, FragmentManager manager) { ensureHierarchy(context); // Ensure views required by super.setup() super.setup(); mContext = context; mFragmentManager = manager; ensureContent(); } public void setup(Context context, FragmentManager manager, int containerId) { ensureHierarchy(context); // Ensure views required by super.setup() super.setup(); mContext = context; mFragmentManager = manager; mContainerId = containerId; ensureContent(); mRealTabContent.setId(containerId); // We must have an ID to be able to save/restore our state. If // the owner hasn't set one at this point, we will set it ourself. if (getId() == View.NO_ID) { setId(android.R.id.tabhost); } } private void ensureContent() { if (mRealTabContent == null) { mRealTabContent = (FrameLayout) findViewById(mContainerId); if (mRealTabContent == null) { throw new IllegalStateException( "No tab content FrameLayout found for id " + mContainerId); } } } @Override public void setOnTabChangedListener(OnTabChangeListener l) { mOnTabChangeListener = l; } public void addTab(TabSpec tabSpec, Class> clss, Bundle args) { tabSpec.setContent(new DummyTabFactory(mContext)); String tag = tabSpec.getTag(); TabInfo info = new TabInfo(tag, clss, args); if (mAttached) { // If we are already attached to the window, then check to make // sure this tab's fragment is inactive if it exists. This shouldn't // normally happen. info.fragment = mFragmentManager.findFragmentByTag(tag); if (info.fragment != null && !info.fragment.isDetached()) { FragmentTransaction ft = mFragmentManager.beginTransaction(); // ft.detach(info.fragment); ft.hide(info.fragment); ft.commit(); } } mTabs.add(info); addTab(tabSpec); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); String currentTab = getCurrentTabTag(); // Go through all tabs and make sure their fragments match // the correct state. FragmentTransaction ft = null; for (int i = 0; i < mTabs.size(); i++) { TabInfo tab = mTabs.get(i); tab.fragment = mFragmentManager.findFragmentByTag(tab.tag); // if (tab.fragment != null && !tab.fragment.isDetached()) { if (tab.fragment != null) { if (tab.tag.equals(currentTab)) { // The fragment for this tab is already there and // active, and it is what we really want to have // as the current tab. Nothing to do. mLastTab = tab; } else { // This fragment was restored in the active state, // but is not the current tab. Deactivate it. if (ft == null) { ft = mFragmentManager.beginTransaction(); } // ft.detach(tab.fragment); ft.hide(tab.fragment); } } } // We are now ready to go. Make sure we are switched to the // correct tab. mAttached = true; ft = doTabChanged(currentTab, ft); if (ft != null) { ft.commitAllowingStateLoss(); mFragmentManager.executePendingTransactions(); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); mAttached = false; } @Override protected Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); ss.curTab = getCurrentTabTag(); return ss; } @Override protected void onRestoreInstanceState(Parcelable state) { SavedState ss = (SavedState) state; super.onRestoreInstanceState(ss.getSuperState()); setCurrentTabByTag(ss.curTab); } @Override public void onTabChanged(String tabId) { if (mAttached) { FragmentTransaction ft = doTabChanged(tabId, null); if (ft != null) { ft.commit(); } } if (mOnTabChangeListener != null) { mOnTabChangeListener.onTabChanged(tabId); } } private FragmentTransaction doTabChanged(String tabId, FragmentTransaction ft) { TabInfo newTab = null; for (int i = 0; i < mTabs.size(); i++) { TabInfo tab = mTabs.get(i); if (tab.tag.equals(tabId)) { newTab = tab; } } if (newTab == null) { throw new IllegalStateException("No tab known for tag " + tabId); } if (mLastTab != newTab) { if (ft == null) { ft = mFragmentManager.beginTransaction(); } if (mLastTab != null) { if (mLastTab.fragment != null) { // ft.detach(mLastTab.fragment); ft.hide(mLastTab.fragment); } } if (newTab != null) { if (newTab.fragment == null) { newTab.fragment = Fragment.instantiate(mContext, newTab.clss.getName(), newTab.args); ft.add(mContainerId, newTab.fragment, newTab.tag); } else { // ft.attach(newTab.fragment); ft.show(newTab.fragment); } } mLastTab = newTab; } return ft; } }
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