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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