Android MarginDesign控件TabLayout导航栏使用详解

TabLayout的使用简单介绍

比如在平常的项目中实现这样的效果，一般都是都会使用viewPageIndicate等几个开源框架直接实现，或者使用自定义的HorizontalScroll再配合ViewPage+Fragment实现。在谷歌推出marginDesign之后，实现这种效果可以直接使用TabLayout实现。另外Tablayout可以通过自定义View自定义导航栏的效果。这样使用的时候更加灵活多变。

首先需要导入design包

在app的build.gradle下添加design的包

dependencies {
  compile 'com.android.support:design:25.0.1'
 }

然后就开始撸起袖子，开始如何使用

在xml文件里面写布局：

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.design.widget.TabLayout
  android:id="@+id/tabLayout"
  android:layout_width="match_parent"
  style="@style/MyCustomTabLayout"
  android:layout_height="wrap_content" />

<android.support.v4.view.ViewPager
  android:id="@+id/viewPager"
  android:layout_width="match_parent"
  android:layout_height="0dp"
  android:layout_weight="1"
  />
</LinearLayout>

既然使用到了fragment，就免不了要添加下简单的布局：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
  android:id="@+id/textView"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_centerInParent="true"
  android:text="默认" />
 </RelativeLayout>

然后是fragment和FragmentPagerAdapter的代码。写过的人应该对这个很熟了，就直接粘下代码

public class FramentAdapter extends FragmentPagerAdapter {
private String[] titles;

public FramentAdapter(FragmentManager fm, String[] titles) {
  super(fm);
  this.titles = titles;
}

@Override
public Fragment getItem(int position) {
  return PageFragment.newInstace(position,titles);
}

@Override
public int getCount() {
  return titles.length;
}

@Override
public CharSequence getPageTitle(int position) {
  return titles[position];
}
}

Fragment的代码：

public class PageFragment extends Fragment {
private int position;
private String[] titles;
private Context context;
public static PageFragment newInstace(int position, String[] titles) {
  Bundle bundle = new Bundle();
  bundle.putInt("POSITION", position);
  bundle.putStringArray("ARRAY", titles);
  PageFragment pageFragment = new PageFragment();
  pageFragment.setArguments(bundle);
  return pageFragment;
}

@Override
public void onAttach(Context context) {
  super.onAttach(context);
  this.context=context;
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  position = getArguments().getInt("POSITION");
  titles = getArguments().getStringArray("ARRAY");
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
  View view =inflater.inflate(R.layout.item_layout,null);
  TextView textView = (TextView) view.findViewById(R.id.textView);
  textView.setText(titles[position]);
  return view;
}
}

写好这些之后最后在MainActivity中看下如何使用：

public class MainActivity extends FragmentActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
private String[] titles = {"黄蓉", "郭靖", "杨过", "小龙女", "尹志平", "金轮法王", "收到货就收到货圣诞节"};
private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  tabLayout = (TabLayout) findViewById(R.id.tabLayout);
  viewPager = (ViewPager) findViewById(R.id.viewPager);
  FramentAdapter framentAdapter = new FramentAdapter(getSupportFragmentManager(), titles);
  viewPager.setAdapter(framentAdapter);
  tabLayout.setupWithViewPager(viewPager);
  tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);}
  }

viewPager.setAdapter(framentAdapter);这行代码必须在下面这行代码之前。有兴趣的可以看下源码。 tabLayout.setupWithViewPager(viewPager);

另外 tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);给tablayout设置了这种模式，mode有两种，这种模式大概的意思是，我内容很多的时候，可以使tab平铺滑动。
很多时候我们需要自己自定义样式或者要自定义我们的tab。

自定义样式：
需要在Style文件下添加自己的样式，然后应用就好了，例如；

<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
  <item name="tabIndicatorColor">?attr/colorAccent</item>
  <item name="tabIndicatorHeight">2dp</item>
  <item name="tabPaddingStart">12dp</item>
  <item name="tabPaddingEnd">12dp</item>
  <item name="tabBackground">?attr/selectableItemBackground</item>
  <item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
  <item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>
<style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
  <item name="android:textSize">14sp</item>
  <item name="android:textColor">?android:textColorSecondary</item>
  <item name="textAllCaps">true</item>
</style>

另外一种就是需要添加我们自定义的View：
首先写要定义的布局文件；

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">

<TextView
  android:id="@id/textView"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:gravity="center"
  />

<TextView
  android:layout_width="10dp"
  android:layout_height="10dp"
  android:background="@drawable/bg_text" />
</LinearLayout>

然后稍微修改下FragmentPagerAdapter的代码

 public class FramentAdapter extends FragmentPagerAdapter {
private String[] titles;

public FramentAdapter(FragmentManager fm, String[] titles) {
  super(fm);
  this.titles = titles;
}

@Override
public Fragment getItem(int position) {
  return PageFragment.newInstace(position,titles);
}

@Override
public int getCount() {
  return titles.length;
}

@Override
public CharSequence getPageTitle(int position) {
  return null;
}
}

最后看下怎么在MainActivity中使用。

public class MainActivity extends FragmentActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
private String[] titles = {"黄蓉", "郭靖", "杨过", "小龙女", "尹志平", "金轮法王", "收到货就收到货圣诞节"};
private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  tabLayout = (TabLayout) findViewById(R.id.tabLayout);
  viewPager = (ViewPager) findViewById(R.id.viewPager);
  FramentAdapter framentAdapter = new FramentAdapter(getSupportFragmentManager(), titles);
  viewPager.setAdapter(framentAdapter);
  tabLayout.setupWithViewPager(viewPager);
  tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
  for (int i = 0; i < tabLayout.getTabCount(); i++) {
    TabLayout.Tab tab = tabLayout.getTabAt(i);
    tab.setCustomView(getTabView(i));
  }
}

private View getTabView(int position) {
  View view = View.inflate(this, R.layout.item_tab_view, null);
  textView = (TextView) view.findViewById(R.id.textView);
  textView.setText(titles[position]);
  return view;
}
}

到这里就结束了TabLayout的使用。放下源码：Tablayout的使用

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