Android 滑动屏幕带圆圈指示

Question

我是 android 的新手，我需要一些关于如何创建带有圆形指示器的教程的基本解释，如下图所示

我使用过 ViewPager，但它会移动整个屏幕以及我的圆圈图像，这看起来不太好。我正在阅读有关 JakeWhatron 的 viewPageIndicator 的信息，但我在寻找问题的核心解决方案。

Answer 1

这是使用 Jake Whatron 的库获取带有文本的圆圈指示器的方法

将此添加到 build.gradle 文件中

compile 'com.viewpagerindicator:library:2.4.1@aar'

将您想要的图像作为主布局的背景。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/hello_layour"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/login_background_image"  // add your background image here
    tools:context=".HelloActivity">

</RelativeLayout>

在你想要指示符和文本的地方添加这个

<LinearLayout
    android:id="@+id/imageView"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:layout_centerHorizontal="true"
    android:orientation="vertical">

    <android.support.v4.view.ViewPager // the actual text you want will be shows here
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <com.viewpagerindicator.CirclePageIndicator // this is the circular indicator 
        android:id="@+id/indicator"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dip" />

</LinearLayout>

创建一个新类添加以下数据(这是 viewpager 的适配器):

package com.your.packagename;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;


public class WelcomePagerAdapter extends PagerAdapter {

    // Declare Variables
    private Context context;
    private String[] title;
    private String[] description;
    private LayoutInflater inflater;

    public WelcomePagerAdapter(Context context, String[] title, String[] description) {
        this.context = context;
        this.title= title;
        this.description= description;
    }

    @Override
    public int getCount() {
        return title.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == ((RelativeLayout) object);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {

        // Declare Variables
        TextView titleView;
        TextView descriptionView;

        inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // layout inflator
        View itemView = inflater.inflate(R.layout.welcome_pager, container,
            false);

        // title text holder
        titleView = (TextView) itemView.findViewById(R.id.welcome_title);
        titleView.setText(title[position]);

        // description text holder
        descriptionView= (TextView) itemView.findViewById(R.id.welcome_description);
        descriptionView.setText(description[position]);

        // add viewpager_item.xml to ViewPager
        ((ViewPager) container).addView(itemView);

        return itemView;

    }


    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // Remove viewpager_item.xml from ViewPager
        ((ViewPager) container).removeView((RelativeLayout) object);

    }
}

为 viewpager 项目的布局创建一个 xml 文件..

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    xmlns:tools="http://schemas.android.com/tools">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/welcome_title"
        android:paddingTop="15dp"
        android:textSize="25sp"
        android:textColor="#fff"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_below="@+id/welcome_title"
        android:id="@+id/welcome_description"
        android:layout_centerHorizontal="true"
        android:gravity="center_horizontal"
        android:padding="15sp"
        android:textColor="#fff" />

</RelativeLayout>

现在最后只需将其添加到教程 Activity 的 onCreate() 部分:

    // pager titles
    String[] titles = new String[]{"Random Title One", "Random Title Two",
            "Random Title Three", "Random Title Four"};

    // pager descriptions
    String[] descriptions= new String[]{"random small description example", "random small description example",
            "random small description example", "random small description example"};

    // Locate the ViewPager in viewpager_main.xml
    ViewPager viewPager = (ViewPager) findViewById(R.id.pager);

    // Pass results to ViewPagerAdapter Class
    PagerAdapter adapter = new WelcomePagerAdapter(this, titles, descriptions);

    // Binds the Adapter to the ViewPager
    viewPager.setAdapter(adapter);

    // ViewPager Indicator
    CirclePageIndicator mIndicator = (CirclePageIndicator) findViewById(R.id.indicator);
    mIndicator.setViewPager(viewPager);