如何在Android中制作可滚动标签？

Question

我有 9 个标签，但处于填充模式。我想让这些 thabs 可滚动。但我不知道诀窍。我尝试了很多方法，但仍然没有。

我的活动：

    package com.bani.fragment2;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.WindowManager;


public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.setTitle("Fragment 1");
    setSupportActionBar(toolbar);


    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 4"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 5"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 6"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 7"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 8"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 9"));
    tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);

    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
    final PagerAdapter adapter = new PageAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener()     {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            switch(tab.getPosition()) {
                case 0:
                    viewPager.setCurrentItem(0);
                    toolbar.setTitle("Fragment 1");
                    break;
                case 1:
                    viewPager.setCurrentItem(1);
                    toolbar.setTitle("Fragment 2");
                    break;
                case 2:
                    viewPager.setCurrentItem(2);
                    toolbar.setTitle("Fragment 3");
                    break;
                case 3:
                    viewPager.setCurrentItem(3);
                    toolbar.setTitle("Fragment 4");
                    break;
                case 4:
                    viewPager.setCurrentItem(4);
                    toolbar.setTitle("Fragment 5");
                    break;
                case 5:
                    viewPager.setCurrentItem(5);
                    toolbar.setTitle("Fragment 6");
                    break;
                case 6:
                    viewPager.setCurrentItem(6);
                    toolbar.setTitle("Fragment 7");
                    break;
                case 7:
                    viewPager.setCurrentItem(7);
                    toolbar.setTitle("Fragment 8");
                    break;
                case 8:
                    viewPager.setCurrentItem(8);
                    toolbar.setTitle("Fragment 9");
                    break;
                default:

                    viewPager.setCurrentItem(tab.getPosition());
                    toolbar.setTitle("Fragment 1");
                    break;
            }



        }


        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

这是我的 Tab 布局：

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:background="?attr/colorPrimary"
    android:elevation="6dp"
    android:minHeight="?attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

<android.support.design.widget.TabLayout
    android:id="@+id/tab_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/toolbar"
    android:background="?attr/colorPrimary"
    android:elevation="6dp"
    android:minHeight="?attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:layout_below="@id/tab_layout"/>

</RelativeLayout>

请帮我解决我的问题，我尝试将标签重力设置为 MODE_SCROLLABLE 和其他方式，但仍然不适合我。

Answer 1

我尝试将标签重力设置为 MODE_SCROLLABLE

这不是重力值。这是要传递给TabLayout (tabs.setTabMode(TabLayout.MODE_SCROLLABLE)) 上的setTabMode() 的值。

来自this book 的This sample project 有一个在三个固定选项卡和十个可滚动选项卡之间切换的活动：

/***
  Copyright (c) 2012-15 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    https://commonsware.com/Android
 */

package com.commonsware.android.tablayout;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {
  private SampleAdapter adapter;
  private TabLayout tabs;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ViewPager pager=(ViewPager)findViewById(R.id.pager);

    adapter=new SampleAdapter(this, getSupportFragmentManager());
    pager.setAdapter(adapter);

    tabs=(TabLayout)findViewById(R.id.tabs);
    tabs.setupWithViewPager(pager);
    tabs.setTabMode(TabLayout.MODE_FIXED);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.actions, menu);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId()==R.id.fixed) {
      item.setChecked(!item.isChecked());

      if (item.isChecked()) {
        adapter.setPageCount(3);
        tabs.setTabMode(TabLayout.MODE_FIXED);
      }
      else {
        adapter.setPageCount(10);
        tabs.setTabMode(TabLayout.MODE_SCROLLABLE);
      }

      adapter.notifyDataSetChanged();
      tabs.setTabsFromPagerAdapter(adapter);

      return(true);
    }

    return(super.onOptionsItemSelected(item));
  }
}

Answer 2

只需将 app:tabMode="scrollable" 放入 xml 中即可。

例如：

<android.support.design.widget.TabLayout
    android:id="@+id/tabs"
    android:background="@color/colorPrimary"
    app:tabMode="scrollable"
    app:tabTextColor="#ccc"
    app:tabIndicatorColor="@android:color/white"
    app:tabSelectedTextColor="@android:color/white"
    android:layout_width="match_parent"
    android:layout_height="40dp" />

Answer 3

将 setTabMode 的值设置为 TabLayout.MODE_SCROLLABLE

tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);

而且，您将能够水平滚动标签。

Answer 4

这里是 Kotlin 用户的代码

val tabLayout = findViewById(R.id.tabs) as TabLayout

tabLayout.tabMode = TabLayout.MODE_SCROLLABLE