TabLayout使用方法详解

TabLayout是design库提供的控件,可以方便的使用指示器,功能类似ViewPagerIndicator.
使用非常方便,Android Studio只需要在gradle中引入即可使用 .

compile 'com.android.support:design:23.3.0'

TabLayout即可以单独使用,也可以配合ViewPager来使用.

先来看看单独使用的Demo,实现如下图的效果:

代码如下:

package blog.csdn.net.mchenys.tablayoudemo;

import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.ViewGroup;
import android.widget.Toast;

/**
 * Created by mChenys on 2016/5/28.
 */
public class TabLayoutOnlyActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  //创建TabLayout
  TabLayout tabLayout = new TabLayout(this);
  tabLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 60));
  //tab可滚动
  tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
  //tab居中显示
  tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);
  //tab的字体选择器,默认黑色,选择时红色
  tabLayout.setTabTextColors(Color.BLACK, Color.RED);
  //tab的下划线颜色,默认是粉红色
  tabLayout.setSelectedTabIndicatorColor(Color.BLUE);
  for (int i = 0; i < 20; i++) {
   //添加tab
   tabLayout.addTab(tabLayout.newTab().setText("TAB" + i));
  }
  final Toast toast = Toast.makeText(this, "", Toast.LENGTH_SHORT);
  toast.setGravity(Gravity.CENTER, 0, 0);
  //设置tab的点击监听器
  tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
   @Override
   public void onTabSelected(TabLayout.Tab tab) {
    toast.setText(tab.getPosition() + ":" + tab.getText());
    toast.show();
   }

   @Override
   public void onTabUnselected(TabLayout.Tab tab) {

   }

   @Override
   public void onTabReselected(TabLayout.Tab tab) {

   }
  });
  setContentView(tabLayout);
 }
}

下面再来看看配合ViewPager的使用方式,实现如下效果图:

布局文件如下:

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

 <!--
 app:tabGravity="center" 对齐方式，可选fill和center
 app:tabIndicatorColor="@color/colorAccent" 设置tab下划线的颜色
 app:tabMode="scrollable" scrollable是可以横行滚动,fixed是指固定个数
 app:tabSelectedTextColor="@color/colorPrimaryDark" 选择tab的文本颜色
 app:tabTextColor="@color/colorPrimary" 普通tab字体颜色
 -->
 <android.support.design.widget.TabLayout
  android:id="@+id/tl_tab"
  android:layout_width="match_parent"
  android:layout_height="55dp"
  app:tabGravity="center"
  app:tabIndicatorColor="@color/colorAccent"
  app:tabMode="scrollable"
  app:tabSelectedTextColor="@color/colorPrimaryDark"
  app:tabTextColor="@color/colorPrimary" />

 <android.support.v4.view.ViewPager
  android:id="@+id/vp_pager"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />
</LinearLayout>

代码如下:

package blog.csdn.net.mchenys.tablayoudemo;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;

/**
 * Created by mChenys on 2016/5/28.
 */
public class TabLayoutWithViewPagerActivity extends AppCompatActivity {

 String[] mTitle = new String[20];
 String[] mData = new String[20];
 TabLayout mTabLayout;
 ViewPager mViewPager;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_tab_view_pager);
  initData();
  initView();
 }

 private void initData() {
  for (int i = 0; i < 20; i++) {
   mTitle[i] = "TAB" + (i + 1);
   mData[i] = "当前选中的是第" + (i + 1) + "Fragment";
  }
 }

 private void initView() {
  mTabLayout = (TabLayout) findViewById(R.id.tl_tab);
  mViewPager = (ViewPager) findViewById(R.id.vp_pager);
  mViewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
   //此方法用来显示tab上的名字
   @Override
   public CharSequence getPageTitle(int position) {
    return mTitle[position % mTitle.length];
   }

   @Override
   public Fragment getItem(int position) {
    //创建Fragment并返回
    TabFragment fragment = new TabFragment();
    fragment.setTitle(mData[position % mTitle.length]);
    return fragment;
   }

   @Override
   public int getCount() {
    return mTitle.length;
   }
  });
  //将ViewPager关联到TabLayout上
  mTabLayout.setupWithViewPager(mViewPager);

//  设置监听,注意:如果设置了setOnTabSelectedListener,则setupWithViewPager不会生效
//  因为setupWithViewPager内部也是通过设置该监听来触发ViewPager的切换的.
//  mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
//   @Override
//   public void onTabSelected(TabLayout.Tab tab) {
//   }
//
//   @Override
//   public void onTabUnselected(TabLayout.Tab tab) {
//
//   }
//
//   @Override
//   public void onTabReselected(TabLayout.Tab tab) {
//
//   }
//  });
//  那我们如果真的需要监听tab的点击或者ViewPager的切换,则需要手动配置ViewPager的切换,例如:
  mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
   @Override
   public void onTabSelected(TabLayout.Tab tab) {
    //切换ViewPager
    mViewPager.setCurrentItem(tab.getPosition());
   }

   @Override
   public void onTabUnselected(TabLayout.Tab tab) {

   }

   @Override
   public void onTabReselected(TabLayout.Tab tab) {

   }
  });
 }
}

TabFragment 代码如下:

package blog.csdn.net.mchenys.tablayoudemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by mChenys on 2016/5/28.
 */
public class TabFragment extends Fragment {
 private String mTitle;

 public void setTitle(String title) {
  this.mTitle = title;
 }

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  TextView textView = new TextView(getContext());
  textView.setTextSize(TypedValue.COMPLEX_UNIT_SP,30);
  textView.setGravity(Gravity.CENTER);
  textView.setText(mTitle);
  return textView;
 }
}

扩展

1.TabLayout除了上面效果图展示的文本以外,从源码中发现它还可以支持Drawable,以及自定义View

public static final class Tab {

  /**
   * An invalid position for a tab.
   *
   * @see #getPosition()
   */
  public static final int INVALID_POSITION = -1;

  private Object mTag;
  private Drawable mIcon;
  private CharSequence mText;
  private CharSequence mContentDesc;
  private int mPosition = INVALID_POSITION;
  private View mCustomView;

  private TabLayout mParent;
  private TabView mView;

  private Tab() {
   // Private constructor
  }

如下效果图,就是通过添加自定义View实现的.

代码如下,只需要修改TabLayout的addTab方法即可:

for (int i = 0; i < 20; i++) {
 //1.支持添加字符串文本tab
 //tabLayout.addTab(tabLayout.newTab().setText("TAB" + i));

 //2.支持添加图片tab
 //tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.ic_launcher));

 //3.支持添加View
 View tabView = View.inflate(TabLayoutOnlyActivity.this, R.layout.view_tab, null);
 ((TextView)tabView.findViewById(R.id.tv_title)).setText("TAB" + i);
 tabLayout.addTab(tabLayout.newTab().setCustomView(tabView));
}

2.替换默认的tab选择效果

如果你即想使用TabLayout,又想不用它的选中效果,例如我们不想要tab下面的那条下划线作为指示效果.我们应该怎么处理呢?

要替换默认的选中效果,只能通过添加自定义View作为tab了.这样就可以很方便的处理View的选中和未选中状态了.

同时我们还要隐藏默认的下划线,这个怎么处理呢,这里有个很好的建议.我们可以通过设置下滑线的颜色和tab的背景 颜色一致,这样就看不出来了.

例如下面我们要实现选中tab的效果是将tab放大1.3倍,没有选中则恢复原来比例.效果图:

修改代码如下:

package blog.csdn.net.mchenys.tablayoudemo;

import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by mChenys on 2016/5/28.
 */
public class TabLayoutOnlyActivity extends AppCompatActivity {
 int initPosition; //默认位置

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 //创建TabLayout
 final TabLayout tabLayout = new TabLayout(this);
 tabLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 100));
 //tab可滚动
 tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
 //tab居中显示
 tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);
 //tab的字体选择器,默认黑色,选择时红色
 tabLayout.setTabTextColors(Color.BLACK, Color.RED);
 //tab的下划线颜色,默认是粉红色,如果要自定义选中效果,则可以将下划线设置为和背景色一样.
 tabLayout.setSelectedTabIndicatorColor(Color.WHITE);
 for (int i = 0; i < 20; i++) {
  //1.支持添加字符串文本tab
  //tabLayout.addTab(tabLayout.newTab().setText("TAB" + i));

  //2.支持添加图片tab
  //tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.ic_launcher));

  //3.支持添加View
  View tabView = View.inflate(TabLayoutOnlyActivity.this, R.layout.view_tab, null);
  ((TextView) tabView.findViewById(R.id.tv_title)).setText("TAB" + i);
  tabLayout.addTab(tabLayout.newTab().setCustomView(tabView));
 }

 //设置tab的点击监听器
 tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
  @Override
  public void onTabSelected(TabLayout.Tab tab) {
  //将默认位置选中为false
  isSelected(tabLayout.getTabAt(initPosition), false);
  //选中当前位置
  isSelected(tab, true);

  }

  @Override
  public void onTabUnselected(TabLayout.Tab tab) {
  //tab未选中
  isSelected(tab, false);
  }

  @Override
  public void onTabReselected(TabLayout.Tab tab) {
  //tab重新选中
  isSelected(tab,true);
  }
 });
 //进来默认选中位置第3个item
 initPosition = 2;
 isSelected(tabLayout.getTabAt(initPosition), true);
 setContentView(tabLayout);
 }

 /**
 * 设置选中的tab是否带缩放效果
 * @param tab
 * @param isSelected
 */
 private void isSelected(TabLayout.Tab tab, boolean isSelected) {
 View view = tab.getCustomView();
 if (null != view) {
  view.setScaleX(isSelected ? 1.3f : 1.0f);
  view.setScaleY(isSelected ? 1.3f : 1.0f);
 }
 }
}

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