虚位以待(AD)
虚位以待(AD)
首页 > 软件编程 > Android编程 > Android中修改TabLayout底部导航条Indicator长短的方法

Android中修改TabLayout底部导航条Indicator长短的方法
类别:Android编程   作者:码皇   来源:互联网   点击:

Tablayout在我们日常开发中经常会遇到,下面这篇文章主要给大家介绍了在Android中修改TabLayout底部导航条Indicator长短的方法,文中给出了详细的示例代码供大家参考学习,需要的朋友们下面来一起看看吧。

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>

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对脚本之家的支持。

相关热词搜索: tablayout indicator android tablayout a