是的,将标签指示器作为标题进行包装并将内边距设置为0是可能的。
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);
layoutParams.leftMargin = start;
layoutParams.rightMargin = end;
} else {
layoutParams.leftMargin = start;
layoutParams.rightMargin = end;
}
}
编辑:
自com.android.support:design:28.0.0
起,您现在可以轻松地将指示器调整为标签,设置如下:
app:tabIndicatorFullWidth="false"
编辑于2019年7月:
使用material依赖项
com.google.android.material:material:x.x.x
从支持库28开始,您可以执行以下操作:
app:tabIndicatorFullWidth="false"
app:tabPaddingStart="25dp"
app:tabPaddingEnd="25dp"
您可以设置所需的填充来影响选项卡指示器。
此外,您现在可以这样做:
app:tabIndicator="@drawable/tab_indicator"
这将设置自定义的可绘制对象作为指示器。
自定义可绘制对象示例:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="@color/colorPrimary"/>
<corners android:radius="5dp"/>
</shape>
如果您不需要条纹比文本小,则应该可以使用以下方法:
public static void reduceMarginsInTabs(TabLayout tabLayout, int marginOffset) {
View tabStrip = tabLayout.getChildAt(0);
if (tabStrip instanceof ViewGroup) {
ViewGroup tabStripGroup = (ViewGroup) tabStrip;
for (int i = 0; i < ((ViewGroup) tabStrip).getChildCount(); i++) {
View tabView = tabStripGroup.getChildAt(i);
if (tabView.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
((ViewGroup.MarginLayoutParams) tabView.getLayoutParams()).leftMargin = marginOffset;
((ViewGroup.MarginLayoutParams) tabView.getLayoutParams()).rightMargin = marginOffset;
}
}
tabLayout.requestLayout();
}
}
如果你愿意的话,你可以检查每个标题的文本大小以获得额外加分。
tabLayout.setTabIndicatorFullWidth(false);
但是它可以与最新的依赖项一起使用,例如:
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:28.0.0'
你可以这样做:
layout/layout_demo.xml
<com.google.android.material.tabs.TabLayout
app:tabIndicatorFullWidth="false"
app:tabIndicator="@drawable/tab_indicator"
.../>
res/tab_indicator.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:gravity="center">
<shape>
<size
android:width="51dp"
android:height="3dp" />
</shape>
</item>
</layer-list>
简短的回答是“不行”。以下是解释。
TabLayout
中有一个名为 SlidingTabStrip
的私有类,用于绘制指示器。
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
// Thick colored underline below the current selection
if (mIndicatorLeft >= 0 && mIndicatorRight > mIndicatorLeft) {
canvas.drawRect(mIndicatorLeft, getHeight() - mSelectedIndicatorHeight,
mIndicatorRight, getHeight(), mSelectedIndicatorPaint);
}
}
我相信你需要的是mIndicatorLeft和mIndicatorRight。这些字段在同一个类中设置:
private void setIndicatorPosition(int left, int right) {
if (left != mIndicatorLeft || right != mIndicatorRight) {
// If the indicator's left/right has changed, invalidate
mIndicatorLeft = left;
mIndicatorRight = right;
ViewCompat.postInvalidateOnAnimation(this);
}
}
其中左右参数在下一个方法中计算:
private void updateIndicatorPosition() {
final View selectedTitle = getChildAt(mSelectedPosition);
int left, right;
if (selectedTitle != null && selectedTitle.getWidth() > 0) {
left = selectedTitle.getLeft();
right = selectedTitle.getRight();
if (mSelectionOffset > 0f && mSelectedPosition < getChildCount() - 1) {
// Draw the selection partway between the tabs
View nextTitle = getChildAt(mSelectedPosition + 1);
left = (int) (mSelectionOffset * nextTitle.getLeft() +
(1.0f - mSelectionOffset) * left);
right = (int) (mSelectionOffset * nextTitle.getRight() +
(1.0f - mSelectionOffset) * right);
}
} else {
left = right = -1;
}
setIndicatorPosition(left, right);
}
最糟糕的是,TabLayout中的SlidingTabStrip字段是私有和final的。
private final SlidingTabStrip mTabStrip;
我不认为在不创建全新的TabLayout的情况下,你能实现你所需的功能。
一种简单的解决方案是在您的tabLayout中添加此属性。
app:tabIndicatorFullWidth="false"
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
style="@style/AppTabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<style name="AppTabLayout" parent="Widget.Design.TabLayout">
<item name="android:layout_marginLeft">40dp</item>
<item name="android:layout_marginRight">40dp</item>
</style>
您只需要添加app:tabMode="scrollable"
。它会自动调整大小
app:tabIndicatorFullWidth="false"