Question

我使用了自定义工具栏。内部自定义工具栏我在tab上方有一个textView。现在我想将TextView的可见性设置为关闭第二个和第三个tab.This是我的布局图像

在此图像中，当选择了正在进行的选项卡时，选项卡上方的文本字段（正在进行的调查结束于......... GMT）应该是可见的，而对于其余选项卡，textview可见性应该消失。我怎么能这样做？

下一个问题是我已经将整个布局的背景设置为在父布局中使用背景图像。但是我得到了标签后面的默认背景。我想要删除默认标签背景颜色并获取父背景。怎么做？

这是我的布局代码：

<?xml version="1.0" encoding="utf-8"?>
<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:background="@drawable/innerpg_bg"
    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="wrap_content"
            android:background="#42474b"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light">
            <ImageView
                android:id="@+id/toolbarlogo"
                android:src="@mipmap/toolbarlogo"
                android:layout_width="wrap_content"
                android:layout_marginRight="200dp"
                android:layout_height="46dp"
                 />
        </android.support.v7.widget.Toolbar>

        <TextView
            android:id="@+id/deadline"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="#494e51"
            android:gravity="center_vertical"
            android:paddingLeft="40dp"
            android:textSize="10dp"
            android:textColor="#fff"
            android:text="The Ongoing survey closes on Dec 31,2016 at 2:00pm GMT"
            />
        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabGravity="fill"
            app:tabMode="fixed" />

    </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>

这是我的java类

package com.example.user.timothysurvey.activity;

import android.app.Dialog;
import android.content.Intent;
import android.graphics.Color;
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.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.user.timothysurvey.R;

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

import fragment.Ongoing;
import fragment.Result;
import fragment.Upcomming;

public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;
    TextView deadLine;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private int[] tabIcons = {
            R.mipmap.ongoing,
            R.mipmap.upcoming,
            R.mipmap.results
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        deadLine= (TextView) findViewById(R.id.deadline);

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

        toolbar.setPadding(0, getStatusBarHeight(), 0, 0);

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

        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setSelectedTabIndicatorHeight(0);

        tabLayout.setupWithViewPager(viewPager);
        setupTabIcons();


    }

    private void setupTabIcons() {
        LayoutInflater inflater = LayoutInflater.from(this);

        View view1 = inflater.inflate(R.layout.custom_tabs, null, false);
        ((TextView) view1.findViewById(R.id.text)).setText("Ongoing");
        ((ImageView) view1.findViewById(R.id.image)).setImageResource(tabIcons[0]);


        View view2 = inflater.inflate(R.layout.custom_tabs, null, false);
        ((TextView) view2.findViewById(R.id.text)).setText("Upcomming");
        ((ImageView) view2.findViewById(R.id.image)).setImageResource(tabIcons[1]);

        View view3 = inflater.inflate(R.layout.custom_tabs, null, false);
        ((TextView) view3.findViewById(R.id.text)).setText("Results");
        ((ImageView) view3.findViewById(R.id.image)).setImageResource(tabIcons[2]);

        tabLayout.getTabAt(0).setCustomView(view1);
        tabLayout.getTabAt(1).setCustomView(view2);
        tabLayout.getTabAt(2).setCustomView(view3);
    }

    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFrag(new Ongoing(), "Ongoing");
        adapter.addFrag(new Upcomming(), "Upcomming");
        adapter.addFrag(new Result(), "Result");
        viewPager.setAdapter(adapter);
    }





    public int getStatusBarHeight() {
        int result = 0;
        int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            result = getResources().getDimensionPixelSize(resourceId);
        }
        return result;
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            case R.id.settings:
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    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 addFrag(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

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

Answer 1

为ViewPager实现OnPageChangeListener

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener{

覆盖onPageSelected方法

@Override
public void onPageSelected(int position) {

    //This method will be invoked when a new page becomes selected.set your visiblity here with respect to tab
    if( position == 0){
        deadLine.setVisibility(View.VISIBLE);
    }
    else if(position == 1){
        deadLine.setVisibility(View.GONE);
    }
    else if(position == 2){
        deadLine.setVisibility(View.GONE);
    }

}

@Override
public void onPageScrollStateChanged(int state) {

}

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

获取tabs.add透明背景后面的默认背景到AppBarLayout。

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#00000000"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

根据选项卡和设置选项卡的背景颜色更改文本可见性

1 个答案: