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

2019-12-12 02:43:06

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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, 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, 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>