在3个选项卡上添加图像

Question

如何将图像添加到选项卡？目前,我能够标签移至底部,但对如何改变不知道 LL Tab1,LL Tab2,LL Tab3以icon.Am我在正确的道路上？任何帮助将不胜感激.

xml代码

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:padding="5dp" >


        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="5dp"
            android:layout_weight="1" >

            <LinearLayout
                android:id="@+id/ll_tab1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" />

            <LinearLayout
                android:id="@+id/ll_tab2"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" />

            <LinearLayout
                android:id="@+id/ll_tab3"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" />
        </FrameLayout>
        <TabWidget
            android:id="@android:id/tabs"
            android:background="@color/light_gray"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"/>
    </LinearLayout>

</TabHost>

有人可以帮忙吗？非常感谢 !

Answer 1

尝试使用TabLayout来自Android设计支持库,以满足对标签材料的设计准则.

设计库TabLayout实现了两个固定选项卡,其中视图的宽度在所有选项卡之间平均分配,以及可滚动选项卡,其中选项卡不是统一大小并且可以水平滚动.

要实现,TabLayout请查看本指南以及如何添加可滑动选项卡的图标以使用设置图标到选项卡setIcon.

final int[] ICONS = new int[]{
        R.drawable.ic_action_document,
        R.drawable.ic_action_tick,
        R.drawable.ic_action_trash};
        ....
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);

tabLayout.getTabAt(0).setIcon(ICONS[0]);
tabLayout.getTabAt(1).setIcon(ICONS[1]);
tabLayout.getTabAt(2).setIcon(ICONS[2]);

要在TabLayout检查中设置底部的标签 - 如何在底部设置标签并隐藏顶部操作栏？将TabLayout放在relativeLayout中并将其与父底部对齐的位置:

<android.support.design.widget.TabLayout
    android:id="@+id/tab_layout"
    app:tabMode="fixed"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:elevation="6dp"
    app:tabTextColor="#d3d3d3"
    app:tabSelectedTextColor="#ffffff"
    app:tabIndicatorColor="#ff00ff"
    android:minHeight="?attr/actionBarSize"
    android:layout_alignParentBottom="true"
    />

虽然您可以将标签布局放在底部,但是根据Pure Android指南,尽量不要使用底部标签栏.

其他平台使用底部标签栏在应用程序的视图之间切换.根据平台惯例,Android的用于视图控制的选项卡显示在屏幕顶部的操作栏中.

Answer 2

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private int[] tabIcons = {
        R.drawable.ic_tab_favourite,
        R.drawable.ic_tab_call,
        R.drawable.ic_tab_contacts
};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(viewPager);
        setupTabIcons();
    }
 private void setupTabIcons() {
    tabLayout.getTabAt(0).setIcon(tabIcons[0]);
    tabLayout.getTabAt(1).setIcon(tabIcons[1]);
    tabLayout.getTabAt(2).setIcon(tabIcons[2]);
}
    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new OneFragment(), "ONE");
        adapter.addFragment(new TwoFragment(), "TWO");
        adapter.addFragment(new ThreeFragment(), "THREE");
        viewPager.setAdapter(adapter);
    }

    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFragment(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }
} 

Tab activity_main.xml的布局

<android.support.design.widget.CoordinatorLayout 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.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="fixed"
            app:tabGravity="fill"/>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"  />
</android.support.design.widget.CoordinatorLayout>

此选项卡中使用的片段(类)

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;



public class OneFragment extends Fragment{

    public OneFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_one, container, false);
    }

}

Xml文件 fragment_one.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.OneFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/one"
        android:textSize="40dp"
        android:textStyle="bold"
        android:layout_centerInParent="true"/>

</RelativeLayout>

TwoFragment.java

import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;



    public class TwoFragment extends Fragment{

        public TwoFragment() {
            // Required empty public constructor
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            return inflater.inflate(R.layout.fragment_two, container, false);
        }

    }

fragment_two.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.TwoFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/one"
        android:textSize="40dp"
        android:textStyle="bold"
        android:layout_centerInParent="true"/>

</RelativeLayout>

您可以像上面一样创建第三个片段类和布局.

运行.希望这会奏效