前言

对于Tablayout相信大家都不陌生，在开发中使用的应该很频繁了，但是底部导航条长短是固定死的，需要自己来改动长短，找了半天没找着方法，看了下官方建议，可以通过映射来修改自己想要的长短，其实也就几行代码的问题。

看代码：

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);

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是左右间距，根据自己的需要来设置，直接调用即可。

很多同学都遇到问题，这里附上源码，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","尚书","太监"};

@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,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：

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

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:id="@+id/container_ranking"

android:layout_width="match_parent"

android:layout_height="match_parent" />

总结

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