Android 修改TabLayout底部導航條Indicator的長短

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關於Tablayout，使用的應該很頻繁了，但是底部導航條長短是固定死的，需要自己來改動長短，找了半天沒找著方法，看了下官方建議，可以通過映射來修改自己想要的長短，其實也就幾行代碼的問題，看代碼：

  public static void setIndicator(Context context, 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 ll_tab = null;        try {            ll_tab = (LinearLayout) tabStrip.get(tabs);        } catch (IllegalAccessException e) {            e.printStackTrace();        }        int left = (int) (getDisplayMetrics(context).density * leftDip);        int right = (int) (getDisplayMetrics(context).density * rightDip);        for (int i = 0; i < ll_tab.getChildCount(); i++) {            View child = ll_tab.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();        }    }

leftDip和rightDip是左右間距，根據自己的需要來設定，直接調用即可。

很多同學都遇到問題，這裡附上源碼，大家可以看看：package com.example.donghe.myrefreshview;import android.app.Activity;import android.content.Context;import android.support.design.widget.TabLayout;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentStatePagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.DisplayMetrics;import android.util.TypedValue;import android.view.View;import android.widget.LinearLayout;import android.widget.TableLayout;import java.lang.reflect.Field;public class MainActivity extends AppCompatActivity {    private static int TAB_MARGIN_DIP = 11;    TabLayout tableLayout;    ViewPager viewPager;    RankingPagerAdapter adapter;    String [] strings = {"皇帝","丞相","尚書","太監"};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tableLayout = (TabLayout) findViewById(R.id.tabs_ranking);        viewPager = (ViewPager) findViewById(R.id.container_ranking);        adapter = new RankingPagerAdapter(getSupportFragmentManager());        viewPager.setAdapter(adapter);        tableLayout.setupWithViewPager(viewPager);        tableLayout.setTabTextColors(getResources().getColor(R.color.black), getResources().getColor(R.color.red_pre));        tableLayout.setTabsFromPagerAdapter(adapter);        setIndicator(this, tableLayout, TAB_MARGIN_DIP, TAB_MARGIN_DIP);    }    private class RankingPagerAdapter extends FragmentStatePagerAdapter {        public RankingPagerAdapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            return new FuelFragment().newInstance(position, strings[position]);        }        @Override        public int getCount() {            return strings.length;        }        @Override        public CharSequence getPageTitle(int position) {            return strings[position];        }    }    public static void setIndicator(Context context, 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 ll_tab = null;        try {            ll_tab = (LinearLayout) tabStrip.get(tabs);        } catch (IllegalAccessException e) {            e.printStackTrace();        }        int left = (int) (getDisplayMetrics(context).density * leftDip);        int right = (int) (getDisplayMetrics(context).density * rightDip);        for (int i = 0; i < ll_tab.getChildCount(); i++) {            View child = ll_tab.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();        }    }    public static DisplayMetrics getDisplayMetrics(Context context) {        DisplayMetrics metric = new DisplayMetrics();        ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(metric);        return metric;    }    public static float getPXfromDP(float value, Context context) {        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value,                context.getResources().getDisplayMetrics());    }}

Fragment：

package com.example.donghe.myrefreshview;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * Created by dong.he on 2016/12/9. */public class FuelFragment extends Fragment {    public static String TAB_POSITION;    public static String TAB_NAME;    private String tabId;    private int tabPosition;    public FuelFragment() {    }    public static Fragment newInstance(int tabPosition, String tabName) {        FuelFragment fragment = new FuelFragment();        Bundle bundle = new Bundle();        bundle.putInt(TAB_POSITION, tabPosition);        bundle.putString(TAB_NAME, tabName);        fragment.setArguments(bundle);        return fragment;    }    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        return inflater.inflate(R.layout.layout, container, false);    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        tabPosition = getArguments().getInt(TAB_POSITION, 0);        tabId = getArguments().getString(TAB_NAME);        ((TextView) getView().findViewById(R.id.text)).setText(tabId);    }}

布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <android.support.design.widget.TabLayout        android:id="@+id/tabs_ranking"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:tabGravity="fill"        app:tabIndicatorColor="@color/red_pre"        app:tabMode="scrollable" />    <android.support.v4.view.ViewPager        android:id="@+id/container_ranking"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

有問題的歡迎垂詢。 

Android 修改TabLayout底部導航條Indicator的長短