原文出处:http://chenfuduo.me/2015/07/30/TabLayout-of-design-support-library/
在开发中,我们常常需要ViewPager结合Fragment一起使用,如下图:
1
我们可以使用三方开源的PagerSlidingTabStrip去实现,或者viewpagerindicator,我一般都偏向前者。现在我们可以使用Design support library库的TabLayout去实现了。最终的效果图:
效果图
<iframe id="aswift_0" style="box-sizing: border-box; border-width: 0px; border-style: initial; margin: 0px; padding: 0px; left: 0px; position: absolute; top: 0px;" name="aswift_0" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" width="728" height="90"></iframe>
创建布局
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical">
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-
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<!--app:tabMode="scrollable" 这个属性我在代码中设置了-->
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<!-- tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);-->
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<android.support.design.widget.TabLayout
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android:id="@+id/sliding_tabs"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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/>
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<android.support.v4.view.ViewPager
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android:id="@+id/viewpager"
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android:layout_width="match_parent"
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android:layout_height="0px"
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android:layout_weight="1"
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android:background="@android:color/white" />
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- </LinearLayout>
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- 在xml添加TabLayout,如同ViewPager,直接`android.support.design.widget.TabLayout`即可。还有其他的属性我会在代码中设置。
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创建Fragment
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package me.chenfuduo.myfragmentdemo.fragment;
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import android.os.Bundle;
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import android.support.annotation.Nullable;
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import android.support.v4.app.Fragment;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.TextView;
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import me.chenfuduo.myfragmentdemo.R;
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- /**
- * Created by Administrator on 2015/7/30.
- */
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public class PageFragment extends Fragment {
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public static final String ARG_PAGE = "ARG_PAGE";
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private int mPage;
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public static PageFragment newInstance(int page) {
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Bundle args = new Bundle();
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args.putInt(ARG_PAGE, page);
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PageFragment pageFragment = new PageFragment();
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pageFragment.setArguments(args);
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return pageFragment;
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}
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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mPage = getArguments().getInt(ARG_PAGE);
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}
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@Nullable
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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View view = inflater.inflate(R.layout.fragment_page, container, false);
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TextView textView = (TextView) view;
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textView.setText("Fragment #" + mPage);
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return view;
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}
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- }
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其中Fragment的布局为:
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<?xml version="1.0" encoding="utf-8"?>
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<TextView xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:gravity="center" />
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ViewPager的适配器
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package me.chenfuduo.myfragmentdemo.adapter;
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import android.content.Context;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.FragmentPagerAdapter;
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import me.chenfuduo.myfragmentdemo.fragment.PageFragment;
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- /**
- * Created by Administrator on 2015/7/30.
- */
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public class SimpleFragmentPagerAdapter extends FragmentPagerAdapter {
-
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final int PAGE_COUNT = 3;
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private String tabTitles[] = new String[]{"tab1","tab2","tab3"};
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private Context context;
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public SimpleFragmentPagerAdapter(FragmentManager fm,Context context) {
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super(fm);
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this.context = context;
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}
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@Override
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public Fragment getItem(int position) {
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return PageFragment.newInstance(position + 1);
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}
-
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@Override
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public int getCount() {
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return PAGE_COUNT;
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}
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@Override
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public CharSequence getPageTitle(int position) {
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return tabTitles[position];
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}
- }
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设置TabLayout
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package me.chenfuduo.myfragmentdemo;
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import android.os.Bundle;
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import android.support.design.widget.TabLayout;
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import android.support.v4.app.FragmentActivity;
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import android.support.v4.view.ViewPager;
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import android.view.Menu;
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import android.view.MenuItem;
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import me.chenfuduo.myfragmentdemo.adapter.SimpleFragmentPagerAdapter;
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public class ThirdActivity extends FragmentActivity {
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private SimpleFragmentPagerAdapter pagerAdapter;
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private ViewPager viewPager;
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private TabLayout tabLayout;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_third);
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pagerAdapter = new SimpleFragmentPagerAdapter(getSupportFragmentManager(), this);
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viewPager = (ViewPager) findViewById(R.id.viewpager);
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viewPager.setAdapter(pagerAdapter);
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tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
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tabLayout.setupWithViewPager(viewPager);
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tabLayout.setTabMode(TabLayout.MODE_FIXED);
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}
- }
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这里提几点我遇到的问题
开始我设置的是:
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tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
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运行后,三个TabLayout标签挤到一块去了。如下:
查看api,找到结果了。这个tabmode有两个属性值:
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MODE_FIXED:Fixed tabs display all tabs concurrently and are best used with content that benefits from quick pivots between tabs.
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MODE_SCROLLABLE:Scrollable tabs display a subset of tabs at any given moment, and can contain longer tab labels and a larger number of tabs.
不做过多的解释,MODE_SCROLLABLE适合很多tabs的情况。
查看下源码就知道了:
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public void setupWithViewPager(ViewPager viewPager) {
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PagerAdapter adapter = viewPager.getAdapter();
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if(adapter == null) {
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throw new IllegalArgumentException("ViewPager does not have a PagerAdapter set");
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} else {
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...
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}
- }
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以上就是最基本的用法,是不是很简单。哈~
定义TabLayout的样式
默认的情况下,TabLayout的tab indicator的颜色是Material Design中的accent color(#009688),我们可以稍作修改:
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<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
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<item name="tabIndicatorColor">#0000FF</item>
- </style>
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在布局中使用:
- <android.support.design.widget.TabLayout
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android:id="@+id/sliding_tabs"
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style="@style/MyCustomTabLayout"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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/>
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还有一些其他的样式可供选择:
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<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
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<item name="tabMaxWidth">@dimen/tab_max_width</item>
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<item name="tabIndicatorColor">?attr/colorAccent</item>
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<item name="tabIndicatorHeight">2dp</item>
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<item name="tabPaddingStart">12dp</item>
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<item name="tabPaddingEnd">12dp</item>
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<item name="tabBackground">?attr/selectableItemBackground</item>
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<item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
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<item name="tabSelectedTextColor">?android:textColorPrimary</item>
- </style>
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<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
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<item name="android:textSize">14sp</item>
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<item name="android:textColor">?android:textColorSecondary</item>
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<item name="textAllCaps">true</item>
- </style>
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添加icon到tab
当前的TabLayout没有方法让我们去添加icon,我们可以使用SpannableString结合ImageSpan来实现,在SimpleFragmentPagerAdapter中:
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private int[] imageResId = {
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R.drawable.ic_one,
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R.drawable.ic_two,
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R.drawable.ic_three
- };
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- // ...
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- @Override
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public CharSequence getPageTitle(int position) {
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// Generate title based on item position
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// return tabTitles[position];
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Drawable image = context.getResources().getDrawable(imageResId[position]);
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image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight());
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SpannableString sb = new SpannableString(" ");
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ImageSpan imageSpan = new ImageSpan(image, ImageSpan.ALIGN_BOTTOM);
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sb.setSpan(imageSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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return sb;
- }
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运行,发现没有显示,这是因为TabLayout创建的tab默认设置textAllCaps属性为true,这阻止了ImageSpan被渲染出来,可以通过下面的样式文件定义来改变:
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<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
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<item name="tabTextAppearance">@style/MyCustomTextAppearance</item>
- </style>
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<style name="MyCustomTextAppearance" parent="TextAppearance.Design.Tab">
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<item name="textAllCaps">false</item>
- </style>
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现在运行,效果就出来了。
添加icon和text到tab
- @Override
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public CharSequence getPageTitle(int position) {
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// Generate title based on item position
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Drawable image = context.getResources().getDrawable(imageResId[position]);
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image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight());
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// Replace blank spaces with image icon
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SpannableString sb = new SpannableString(" " + tabTitles[position]);
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ImageSpan imageSpan = new ImageSpan(image, ImageSpan.ALIGN_BOTTOM);
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sb.setSpan(imageSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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return sb;
- }
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我们看到在实例化SpannableString的时候,我在tabTitles[position]前面加了几个空格,这些空格的位置是用来放置icon的。
添加自定义的view到tab
适配器中增加getTabView(...)方法:
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package me.chenfuduo.myfragmentdemo.adapter;
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import android.content.Context;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.FragmentPagerAdapter;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.widget.ImageView;
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import android.widget.TextView;
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import me.chenfuduo.myfragmentdemo.R;
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import me.chenfuduo.myfragmentdemo.fragment.PageFragment;
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- /**
- * Created by Administrator on 2015/7/30.
- */
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public class SimpleFragmentPagerAdapter extends FragmentPagerAdapter {
-
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final int PAGE_COUNT = 3;
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private String tabTitles[] = new String[]{"tab1", "tab2", "tab3"};
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private int[] imageResId = {R.drawable.avatar_enterprise_vip,
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R.drawable.avatar_grassroot,
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R.drawable.avatar_vip};
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private Context context;
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public SimpleFragmentPagerAdapter(FragmentManager fm, Context context) {
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super(fm);
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this.context = context;
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}
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@Override
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public Fragment getItem(int position) {
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return PageFragment.newInstance(position + 1);
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}
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@Override
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public int getCount() {
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return PAGE_COUNT;
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}
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@Override
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public CharSequence getPageTitle(int position) {
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//第一次的代码
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//return tabTitles[position];
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//第二次的代码
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/**
- Drawable image = context.getResources().getDrawable(imageResId[position]);
- image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight());
- SpannableString sb = new SpannableString(" " + tabTitles[position]);
- ImageSpan imageSpan = new ImageSpan(image, ImageSpan.ALIGN_BOTTOM);
- sb.setSpan(imageSpan, 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
- return sb;*/
-
-
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return null;
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}
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public View getTabView(int position){
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View view = LayoutInflater.from(context).inflate(R.layout.tab_item, null);
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TextView tv= (TextView) view.findViewById(R.id.textView);
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tv.setText(tabTitles[position]);
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ImageView img = (ImageView) view.findViewById(R.id.imageView);
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img.setImageResource(imageResId[position]);
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return view;
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}
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- }
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简单的布局:
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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>
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<ImageView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:id="@+id/imageView"
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android:layout_centerVertical="true"
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/>
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_toRightOf="@id/imageView"
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android:layout_centerVertical="true"
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android:id="@+id/textView"
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android:layout_marginLeft="3dp"
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/>
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- </RelativeLayout>
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使用:
- @Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_third);
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pagerAdapter = new SimpleFragmentPagerAdapter(getSupportFragmentManager(), this);
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viewPager = (ViewPager) findViewById(R.id.viewpager);
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viewPager.setAdapter(pagerAdapter);
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tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
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tabLayout.setupWithViewPager(viewPager);
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tabLayout.setTabMode(TabLayout.MODE_FIXED);
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for (int i = 0; i < tabLayout.getTabCount(); i++) {
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TabLayout.Tab tab = tabLayout.getTabAt(i);
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tab.setCustomView(pagerAdapter.getTabView(i));
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}
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}
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处理配置改变
当屏幕旋转或者配置改变的时候,我们需要保存当前的状态。
- @Override
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public void onSaveInstanceState(Bundle outState) {
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super.onSaveInstanceState(outState);
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outState.putInt(POSITION,tabLayout.getSelectedTabPosition());
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}
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@Override
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protected void onRestoreInstanceState(Bundle savedInstanceState) {
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super.onRestoreInstanceState(savedInstanceState);
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viewPager.setCurrentItem(savedInstanceState.getInt(POSITION));
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}
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需要注意的是getSelectedTabPosition()方法是最新的design support library才有的。
最后的效果如下:
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