Android Material Design控件之TabLayout

Android Material Design Android官方控件学习

TabLayout

• 标签栏
• extends HorizontalScrollView 水平滚动布局
• 需要结合TabItem一起使用
• 不再需要使用第三方库如PagerSlidingTabStrip,或者TabHost,
• TabLayout简单地实现标签栏

导入design库

'com.android.support:design:26.1.0'

xml

TabLayout

• 这里直接写入三个TabItem
• app:tabIndicatorColor:指示器颜色
• app:tabIndicatorHeight:指示器高度
• app:tabSelectedTextColor: 选中TabItem字体颜色
• app:tabTextColor:未选中TabItem字体颜色
  TabItem
• android:icon="@drawable/ic_action_tab"//设置图片
• android:text=“第一项”//设置文字

<android.support.design.widget.TabLayout
			android:id="@+id/tabLayout"
			android:background="#3558B3"
			app:tabIndicatorColor="#cdcdcd"
			app:tabIndicatorHeight="4dp"
			app:tabSelectedTextColor="#fff"
			app:tabTextColor="#cdcdcd"
			app:tabTextAppearance="@style/TextAppearance.AppCompat.Small"
			android:layout_width="match_parent"
			android:layout_height="wrap_content">

			<android.support.design.widget.TabItem
				android:icon="@drawable/ic_action_tab"
				android:text="第一项"
				android:tag="tag第三项"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"/>

			<android.support.design.widget.TabItem
				android:icon="@drawable/ic_action_tab"
				android:text="第二项"
				android:tag="tag第三项"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"/>
			<android.support.design.widget.TabItem
				android:icon="@drawable/ic_action_tab"
				android:tag="tag第三项"
				android:text="第三项"
				android:layout_width="wrap_content"
				android:layout_height="wrap_content"/>
		</android.support.design.widget.TabLayout>

	</LinearLayout>

OnTabSelectedListener TabLayout监听事件

切换Tab

• 先调用onTabUnselected(TabLayout.Tab tab):切换前选中tab
• 再调用onTabSelected(TabLayout.Tab tab):切换后选中tab

重新点击选中Tab

• onTabReselected(TabLayout.Tab tab):选中Tab

        TabLayout mTabLayout =   findViewById(R.id.tabLayout);
        mTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                tab.getText();
                tab.getPosition();
                tab.getTag();
                Toast.makeText(TabLayoutActivity.this,"onTabSelected"+tab.getText()+tab.getPosition()+tab.getTag(), Toast.LENGTH_SHORT).show();
                Log.e("onTabSelected",""+tab.getText()+tab.getPosition()+tab.getTag());
            }

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

                Log.e("onTabUnselected",""+tab.getText()+tab.getPosition()+tab.getTag());
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
                Log.e("onTabReselected",""+tab.getText()+tab.getPosition()+tab.getTag());
            }
        });

MaterialDesignWidget.TabLayoutActivity 设置nestedScrollView的topMargin,

• 实现Toolbar、TabLayout、NestedScrollView在CoordinatorLayout中的合理布局

        //测量ll_appbar,设置nestedScrollView的topMargin
        LinearLayout mLLAppbar =   findViewById(R.id.ll_appbar);
        int width2 = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        int height2 = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        mLLAppbar.measure(width2,height2);
        int  height=mLLAppbar.getMeasuredHeight();
        NestedScrollView mNestedScrollView =   findViewById(R.id.nestedScrollView);
        CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) mNestedScrollView.getLayoutParams();
        layoutParams.topMargin=height;
        mNestedScrollView.setLayoutParams(layoutParams);
 

源码地址：https://github.com/LinweiJ/MaterialDesignWidget