Android TabLayout自定义指示器宽度
我想减小指示器的宽度-例如,使其宽度不是整个选项卡宽度,而是选项卡宽度的1/2。Android TabLayout自定义指示器宽度,android,android-viewpager,android-tablayout,Android,Android Viewpager,Android Tablayout,我想减小指示器的宽度-例如,使其宽度不是整个选项卡宽度,而是选项卡宽度的1/2。 这就是我所需要做的,所以我不想下载一些自定义库并在哪里搜索我可以做到这一点 这是一种方法,还是我应该自己写这样的视图?试试这个 public void setIndicator (TabLayout tabs,int leftDip,int rightDip){ Class<?> tabLayout = tabs.getClass(); Field tabStrip = null;
这就是我所需要做的,所以我不想下载一些自定义库并在哪里搜索我可以做到这一点 这是一种方法,还是我应该自己写这样的视图?试试这个
public void setIndicator (TabLayout tabs,int leftDip,int rightDip){
Class<?> tabLayout = tabs.getClass();
Field tabStrip = null;
try {
tabStrip = tabLayout.getDeclaredField("mTabStrip");
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
tabStrip.setAccessible(true);
LinearLayout llTab = null;
try {
llTab = (LinearLayout) tabStrip.get(tabs);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
int left = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, leftDip, Resources.getSystem().getDisplayMetrics());
int right = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, rightDip, Resources.getSystem().getDisplayMetrics());
for (int i = 0; i < llTab.getChildCount(); i++) {
View child = llTab.getChildAt(i);
child.setPadding(0, 0, 0, 0);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
params.leftMargin = left;
params.rightMargin = right;
child.setLayoutParams(params);
child.invalidate();
}
}
我的修改没有反射(应该设置自定义视图!)。
for (int i = 0; i < tabs.getTabCount(); i++) {
TabLayout.Tab tab = tabs.getTabAt(i);
if (tab != null) {
View customView = tab.getCustomView();
if (customView != null) {
View targetViewToApplyMargin = (View) customView.getParent();
ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) targetViewToApplyMargin.getLayoutParams();
layoutParams.rightMargin = totalTabMargin;
targetViewToApplyMargin.setLayoutParams(layoutParams);
}
}
}
for(int i=0;i
您可以复制表格布局,并修改计算指示器宽度的逻辑。请参见updateIndicatorPosition()和AnimateIndicatorPosition()。
一个简单的演示对于任何最终解决此问题的人,我发现了一个简单的解决方案,其中90%的标签宽度指示器使用向量可绘制: ic_选项卡_指示器_24dp:
<vector
android:height="24dp"
android:width="24dp"
android:viewportHeight="24.0"
android:viewportWidth="24.0"
xmlns:android="http://schemas.android.com/apk/res/android">
<path
android:strokeWidth="4"
android:fillColor="@android:color/white"
android:pathData="M2,0 L22,0 L22,24 L2,24 z"/>
或在styles.xml中:
<item name="tabIndicator">@drawable/ic_tab_indicator_24dp</item>
@drawable/ic\u tab\u指示器\u 24dp
编辑:由于我的解决方案越来越受关注,我想补充一点,您可以通过修改pathData(“M2,0 L22,0 L22,24 L2,24 z”)来调整宽度,更改2和22个值。加在2上的金额应从22中减去。i、 e.:“M4,0 L20,0 L20,24 L4,24 z”或“M6,0 L18,0 L18,24 L6,24 z”…尝试了所有这些解决方案,但不满意,最后我自己找到了一个解决方案,我们只需修改SlidingTabicator的indicatorLeft和indicatorRight文件,扩展表格布局并在需要时调用SetIndicatorWidth(),例如:
setIndicatorWidth(70)代码>
整个代码:
import android.content.Context;
import android.content.res.Resources;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.google.android.material.tabs.TabLayout;
import java.lang.reflect.Field;
import androidx.annotation.NonNull;
public class TabLayoutEx extends TabLayout {
public TabLayoutEx(Context context) {
this(context, null);
}
public TabLayoutEx(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TabLayoutEx(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs);
}
private void init(AttributeSet attrs) {
setTabIndicatorFullWidth(false);
setIndicatorWidth(70);
}
private class DefPreDrawListener implements ViewTreeObserver.OnPreDrawListener {
private LinearLayout tabStrip = null;
private int tabWidth;
private Field fieldLeft;
private Field fieldRight;
public void setTabStrip(LinearLayout tabStrip, int width) {
try {
this.tabStrip = tabStrip;
this.tabWidth = width;
Class cls = tabStrip.getClass();
fieldLeft = cls.getDeclaredField("indicatorLeft");
fieldLeft.setAccessible(true);
fieldRight = cls.getDeclaredField("indicatorRight");
fieldRight.setAccessible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public boolean onPreDraw() {
try {
if (tabWidth > 0) {
int left = fieldLeft.getInt(this.tabStrip);
int right = fieldRight.getInt(this.tabStrip);
//根据目标宽度及现在的宽度调整为合适的left和right
int diff = right - left - tabWidth;
left = left + diff / 2;
right = right - diff / 2;
fieldLeft.setInt(this.tabStrip, left);
fieldRight.setInt(this.tabStrip, right);
}
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
}
private DefPreDrawListener defPreDrawListener = new DefPreDrawListener();
public void setIndicatorWidth(int widthDp) {
Class<?> tabLayout = TabLayout.class;
Field tabStrip = null;
try {
tabStrip = tabLayout.getDeclaredField("slidingTabIndicator");
tabStrip.setAccessible(true);
LinearLayout tabIndicator = (LinearLayout) tabStrip.get(this);
int width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, widthDp, Resources.getSystem().getDisplayMetrics());
//avoid add preDrawListener multi times
tabIndicator.getViewTreeObserver().removeOnPreDrawListener(defPreDrawListener);
tabIndicator.getViewTreeObserver().addOnPreDrawListener(defPreDrawListener);
defPreDrawListener.setTabStrip(tabIndicator, width);
} catch (Exception e) {
e.printStackTrace();
}
}
}
导入android.content.Context;
导入android.content.res.Resources;
导入android.util.AttributeSet;
导入android.util.TypedValue;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewTreeObserver;
导入android.widget.LinearLayout;
导入android.widget.TextView;
导入com.google.android.material.tabs.TabLayout;
导入java.lang.reflect.Field;
导入androidx.annotation.NonNull;
公共类TabLayoutEx扩展了TabLayout{
公共TabLayoutEx(上下文){
这个(上下文,空);
}
公共TabLayoutEx(上下文、属性集属性){
这(上下文,属性,0);
}
公共TabLayoutEx(上下文上下文、属性集属性、int defStyleAttr){
super(上下文、attrs、defStyleAttr);
init(attrs);
}
私有void init(属性集属性){
setTabIndicatorFullWidth(假);
setIndicatorWidth(70);
}
私有类DefPreDrawListener实现ViewTreeObserver.OnPreDrawListener{
private LinearLayout tabStrip=null;
私有int标签宽度;
私人领域左;
私人田权;
公共void setTabStrip(LinearLayout tabStrip,整数宽度){
试一试{
this.tabStrip=tabStrip;
this.tabWidth=宽度;
类cls=tabStrip.getClass();
fieldLeft=cls.getDeclaredField(“indicatorLeft”);
fieldLeft.setAccessible(true);
fieldRight=cls.getDeclaredField(“指示灯右”);
fieldRight.setAccessible(true);
}捕获(例外e){
e、 printStackTrace();
}
}
@凌驾
公共布尔onPreDraw(){
试一试{
如果(tabWidth>0){
int left=fieldLeft.getInt(this.tabStrip);
int right=fieldRight.getInt(this.tabStrip);
//根据目标宽度及现在的宽度调整为合适的左边和正确的
int diff=右-左-选项卡宽度;
左=左+差/2;
右=右-差/2;
fieldLeft.setInt(this.tabStrip,左);
fieldRight.setInt(this.tabStrip,右);
}
}捕获(例外e){
e、 printStackTrace();
}
返回true;
}
}
private DefPreDrawListener DefPreDrawListener=新建DefPreDrawListener();
公共无效设置指示器宽度(int-widthDp){
类tabLayout=tabLayout.Class;
字段tabStrip=null;
试一试{
tabStrip=tabLayout.getDeclaredField(“slidingTabIndicator”);
tabStrip.setAccessible(true);
LinearLayout tabIndicator=(LinearLayout)tabStrip.get(this);
int width=(int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,widthDp,Resources.getSystem().getDisplayMetrics());
//避免多次添加preDrawListener
tabIndicator.getViewTreeObserver().removeOnPreDrawListener(defPreDrawListener);
tabIndicator.getViewTreeObserver().addOnPreDrawListener(defPreDrawListener);
setTabStrip(tabIndicator,宽度);
}捕获(例外e){
e、 printStackTrace();
}
}
}
如果您想要一个固定大小的标签指示器,您可以通过drawable创建一个固定大小的指示器形状:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:gravity="center">
<shape android:shape="rectangle">
<solid android:color="@color/colorAccent" />
<corners
android:topLeftRadius="2dp"
android:topRightRadius="2dp" />
<size
android:width="16dp"
android:height="2dp" />
</shape>
</item>
</layer-list>
由于可绘制对象本身将形状置于其边界内的中心,因此指示器将具有固定的大小
如果希望指示器与标签宽度匹配,可以删除选项卡indicatorandroid:gravity
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="@color/colorAccent" />
<corners
radius="2dp" />
<size
android:width="16dp"
android:height="2dp" />
</shape>
</item>
</layer-list>
非常感谢!我对你的答案做了一点修改(使用自定义视图,没有反射)。但方向绝对正确!Tha
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:gravity="center">
<shape android:shape="rectangle">
<solid android:color="@color/colorAccent" />
<corners
android:topLeftRadius="2dp"
android:topRightRadius="2dp" />
<size
android:width="16dp"
android:height="2dp" />
</shape>
</item>
</layer-list>
app:tabIndicatorColor="@color/tabIndicatorColor"
app:tabIndicator="@drawable/tab_indicator"
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="@color/colorAccent" />
<corners
radius="2dp" />
<size
android:width="16dp"
android:height="2dp" />
</shape>
</item>
</layer-list>