如何自定义 Tab 指示器宽度？

Question

我想要这种类型的选项卡指示器如何实现这一点，我已经尝试了所有具有可绘制可选处理程序的解决方案，但没有得到任何解决方案

Answer 1

有一种更简单的方法可以实现这一点，只需drawable向app:tabIndicator.

例如，在这种情况下：

下划线.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <item android:gravity="center">
        <shape>
            <size
                android:width="22dp"
                android:height="2dp" />

            <corners android:radius="2dp" />

            <solid android:color="#FF0000" />
        </shape>
    </item>
</layer-list>

TabLayout并以这种方式将其添加到您的中

<com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/_16dp"
        android:layout_marginTop="@dimen/_16dp"
        app:tabIndicator="@drawable/underline"
        app:tabIndicatorColor="@color/offers_header_text"
        app:tabIndicatorHeight="4dp"
        app:tabMode="scrollable"
        app:tabRippleColor="@null" />

Answer 2

尝试这个：

public void wrapTabIndicatorToTitle(TabLayout tabLayout, int externalMargin, int internalMargin) {
    View tabStrip = tabLayout.getChildAt(0);
    if (tabStrip instanceof ViewGroup) {
        ViewGroup tabStripGroup = (ViewGroup) tabStrip;
        int childCount = ((ViewGroup) tabStrip).getChildCount();
        for (int i = 0; i < childCount; i++) {
            View tabView = tabStripGroup.getChildAt(i);
            //set minimum width to 0 for instead for small texts, indicator is not wrapped as expected
            tabView.setMinimumWidth(0);
            // set padding to 0 for wrapping indicator as title
            tabView.setPadding(0, tabView.getPaddingTop(), 0, tabView.getPaddingBottom());
            // setting custom margin between tabs
            if (tabView.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
                ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) tabView.getLayoutParams();
                if (i == 0) {
                    // left
                    settingMargin(layoutParams, externalMargin, internalMargin);
                } else if (i == childCount - 1) {
                    // right
                    settingMargin(layoutParams, internalMargin, externalMargin);
                } else {
                    // internal
                    settingMargin(layoutParams, internalMargin, internalMargin);
                }
            }
        }


        tabLayout.requestLayout();
    }
}

private void settingMargin(ViewGroup.MarginLayoutParams layoutParams, int start, int end) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        layoutParams.setMarginStart(start);
        layoutParams.setMarginEnd(end);
    } else {
        layoutParams.leftMargin = start;
        layoutParams.rightMargin = end;
    }
}

在 java 文件中设置视图寻呼机后添加：

wrapTabIndicatorToTitle(tabLayout,80,80);