MyUtils.java

/*
 * Copyright (c) 2016 咖枯 <kaku201313@163.com | 3772304@qq.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.jaydenxiao.androidfire.utils;

import android.app.Activity;
import android.support.design.widget.TabLayout;
import android.view.View;
import android.view.ViewGroup;

import com.jaydenxiao.androidfire.app.AppApplication;

/**
 * @author 咖枯
 * @version 1.0 2016/5/31
 */
public class MyUtils {

    public static void dynamicSetTabLayoutMode(TabLayout tabLayout) {
        int tabWidth = calculateTabWidth(tabLayout);
        int screenWidth = getScreenWith();

        if (tabWidth <= screenWidth) {
            tabLayout.setTabMode(TabLayout.MODE_FIXED);
        } else {
            tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
        }
    }
    private static int calculateTabWidth(TabLayout tabLayout) {
        int tabWidth = 0;
        for (int i = 0; i < tabLayout.getChildCount(); i++) {
            final View view = tabLayout.getChildAt(i);
            view.measure(0, 0); // 通知父view测量，以便于能够保证获取到宽高
            tabWidth += view.getMeasuredWidth();
        }
        return tabWidth;
    }
    public static int getScreenWith() {
        return AppApplication.getAppContext().getResources().getDisplayMetrics().widthPixels;
    }
    public static View getRootView(Activity context) {
        return ((ViewGroup) context.findViewById(android.R.id.content)).getChildAt(0);
    }
}