在TabLayout(Android设计支持库)中更改选项卡的背景颜色不会占用整个选项卡空间

Question

我有一个TabLayout(设计支持库),它与包含三个选项卡的ViewPager绑定在一起.我设计了一个自定义布局,并将其设置为TabLayout中的每个选项卡.我一直在尝试更改当前所选选项卡的背景颜色.颜色仅包含在选项卡中的文本周围,但不占用整个选项卡空间.

以下是我的活动和自定义布局文件的代码段.

活动代码

public class CustomTabLayoutActivity extends AppCompatActivity {

private TabLayout tabLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_custom_tab_layout);
    tabLayout = (TabLayout) findViewById(R.id.tabLayout);
    ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
    setupViewPager(viewPager);
    tabLayout.setupWithViewPager(viewPager);
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    setupTabLayout();
    viewPager.setCurrentItem(0);
    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            for (int i = 0; i < tabLayout.getTabCount(); i++) {
                if (i == position) {
                    tabLayout.getTabAt(i).getCustomView().setBackgroundColor(Color.parseColor("#198C19"));
                } else {
                    tabLayout.getTabAt(i).getCustomView().setBackgroundColor(Color.parseColor("#f4f4f4"));
                }
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        }
    });
}


private void setupViewPager(ViewPager viewPager) {
    CustomViewPagerAdapter pagerAdapter = new CustomViewPagerAdapter(getSupportFragmentManager());
    pagerAdapter.addFragments(new OneFragment(), "ONE");
    pagerAdapter.addFragments(new OneFragment(), "TWO");
    pagerAdapter.addFragments(new OneFragment(), "THREE");
    viewPager.setAdapter(pagerAdapter);
}

private void setupTabLayout() {

    TextView customTab1 = (TextView) LayoutInflater.from(CustomTabLayoutActivity.this)
            .inflate(R.layout.custom_tab_layout, null);
    TextView customTab2 = (TextView) LayoutInflater.from(CustomTabLayoutActivity.this)
            .inflate(R.layout.custom_tab_layout, null);
    TextView customTab3 = (TextView) LayoutInflater.from(CustomTabLayoutActivity.this)
            .inflate(R.layout.custom_tab_layout, null);
    customTab1.setText("ONE");
    tabLayout.getTabAt(0).setCustomView(customTab1);
    customTab2.setText("TWO");
    tabLayout.getTabAt(1).setCustomView(customTab2);
    customTab3.setText("THREE");
    tabLayout.getTabAt(2).setCustomView(customTab3);
}
}

每个选项卡的自定义布局文件

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/tab"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:layout_gravity="center"
   android:background="#ffffff"
   android:text="Test"
   android:textColor="@android:color/black"
   android:textSize="20sp" />

以下是运行上述代码后选项卡的屏幕截图.

正如大家们所看到的,颜色只占据选项卡中的文本而不占整个选项卡空间.怎么做到这一点？任何想法/建议都会对我有所帮助.提前致谢.

Answer 1

将选择器定义为可绘制的,并且还具有所选/未选择状态的可绘制.

对于此解决方案,我从这个答案的代码开始,然后添加了更改当前Tab的背景颜色的功能.

首先,drawable文件夹中的selector,tab_background.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/tab_background_selected" android:state_selected="true" />
    <item android:drawable="@drawable/tab_background_unselected" android:state_selected="false" android:state_focused="false" android:state_pressed="false" />
</selector>

然后,drawable文件夹中的tab_background_selected.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#d13fdd1a" />
</shape>

然后,drawable文件夹中的tab_background_unselected.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <solid android:color="#3F51B5" />
</shape>

最后,在styles.xml中,指定要使用的选择器,并指定选项卡指示器样式,因为tab_background.xml现在将忽略TabLayout中的属性:

<style name="Base.Widget.Design.TabLayout" parent="android:Widget">
    <item name="tabBackground">@drawable/tab_background</item>
    <item name="tabIndicatorColor">#ff00ff</item>
    <item name="tabIndicatorHeight">2dp</item>
</style>

以上示例颜色的结果:

附加说明:

使用23.3.0版本的支持库组件进行测试:

dependencies {
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.android.support:cardview-v7:23.3.0'
    compile 'com.android.support:recyclerview-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.android.support:support-v4:23.3.0'
}

Answer 2

你应该使用：

app:tabBackground="@drawable/tab_selector"
android:background="@color/colorNormal"

tab_selector.xml（在 Drawable 文件夹中）：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@color/colorSelected"/>
    <item android:state_selected="false" android:drawable="@color/colorNormal"/>
</selector>