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Android 发布时间：2022-04-28 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了Android中修改TabLayout底部导航条Indicator长短的方法，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

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：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://scheR_401_11845@as.android.com/apk/res/android"
 xmlns:app="http://scheR_401_11845@as.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>

Android中修改TabLayout底部导航条Indicator长短的方法