android – Tabs不适合使用tabmode = scrollable的屏幕,即使使用自定义选项卡布局

我使用ViewPager创建了一个自定义TabLayout,并在可滚动模式下使用TabLayout：

我需要它可以滚动,因为日期的数量可以变化到多达15-20：

<com.example.project.recommendedapp.CustomScrollableTabLayout
    android:id="@+id/tab_layout_movie"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:elevation="6dp"
    android:minHeight="?attr/actionBarSize"
    app:tabGravity="fill"
    app:tabMode="scrollable"
    app:tabTextAppearance="?android:textAppearanceMedium"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

我按照另一个类似的问题使用的自定义类：
TabLayout not filling width when tabMode set to ‘scrollable’

自定义tablayout类是：

package com.example.project.recommendedapp;

import android.content.Context;
import android.graphics.Point;
import android.support.design.widget.TabLayout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;

import java.lang.reflect.Field;

public class CustomScrollableTabLayout extends TabLayout {
    private Context mContext;

    Point size;

    public CustomScrollableTabLayout(Context context) {
        super(context);
        mContext=context;
        size = new Point();
    }

    public CustomScrollableTabLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext=context;
        size = new Point();
    }

    public CustomScrollableTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext=context;
        size = new Point();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        try {
            if (getTabCount() == 0) {
                return;
            }else {
                Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
                display.getSize(size);
                int width = size.x;

                Field field = TabLayout.class.getDeclaredField("mScrollableTabMinWidth");
                field.setAccessible(true);
                field.set(this, (width / getTabCount()));

                Log.d("FragmentCreate",String.valueOf(width / getTabCount()));
            }
        } catch (Exception e) {
            Log.e("FragmentCreate","Error while setting width",e);
        }
    }
}

解决方法:

我全神贯过地寻找这个问题的答案.在我的情况下,我是动态添加和删除标签,所以我希望它只有几个标签填充屏幕,但是当有太多而不是缩小它们或将标题放在两行时开始滚动.使用以下自定义选项卡布局终于让它适合我.在调用super.onMeasure()之前设置最小宽度是关键.

public class CustomTabLayout extends TabLayout {

    public CustomTabLayout(Context context) {
        super(context);
    }

    public CustomTabLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        ViewGroup tabLayout = (ViewGroup)getChildAt(0);
        int childCount = tabLayout.getChildCount();

        if( childCount != 0 ) { 
            DisplayMetrics displayMetrics = getContext().getResources().getDisplayMetrics();
            int tabMinWidth = displayMetrics.widthPixels/childCount;

            for(int i = 0; i < childCount; ++i){
                tabLayout.getChildAt(i).setMinimumWidth(tabMinWidth);
            }
        }

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

将选项卡模式设置为在xml中可滚动.

    <com.package.name.CustomTabLayout
        android:id="@+id/my_tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable">

标签：android-tablayout,android
来源： https://codeday.me/bug/20190928/1825268.html