Android实现启动引导图

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="Http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <android.support.v4.view.ViewPager
        android:id="@+id/guide_vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
 
    <LinearLayout
        android:id="@+id/ll_guide_point"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="40dp"
        android:gravity="center_horizontal"
        android:orientation="horizontal" />
 
    <ImageButton
        android:id="@+id/guide_ib_start"
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_vertical"
        android:layout_marginBottom="120dp"
        android:src="@mipmap/img_guide_start"
        android:visibility="Gone" />
</RelativeLayout>

public class GuidePageAdapter extends PagerAdapter {
    //存放图片的集合
    private List<View> viewList;
 
    public GuidePageAdapter(List<View> viewList) {
        this.viewList = viewList;
    }
 
    
    @Override
    public int getCount() {
        if (viewList != null) {
            return viewList.size();
        }
        return 0;
    }
 
    
    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }
 
    
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(viewList.get(position));
        return viewList.get(position);
    }
 
 
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewList.get(position));
    }
}

 
public class GuideActivity extends BaseActivity<LoginContract.Presenter> implements LoginContract.View, ViewPager.OnPageChangeListener {
 
    @BindView(R.id.guide_ib_start)
    ImageButton guideIbStart;
    @BindView(R.id.guide_vp)
    ViewPager guideVp;
    @BindView(R.id.ll_guide_point)
    LinearLayout llGuidePoint;
    private int[] imagePositionArray;//图片资源的数组
    private List<View> viewList;//图片资源的集合
 
    //实例化原点View
    private ImageView iv_point;
    private ImageView[] ivPointArray;
 
    @Override
    public int getLayoutId() {
        return R.layout.activity_guide;
    }
 
    @Override
    public LoginContract.Presenter initPresenter() {
        return new LoginPresenter(this);
    }
 
    @Override
    public void initView() {
        //加载滑动的ViewPager
        initViewPager();
        //加载底部圆点
        initPoint();
    }
 
    @OnClick({R.id.ll_guide_point, R.id.guide_ib_start})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.guide_ib_start:
                //从启动页跳转到引导页，修改保存的值，再次进入时跳过此页面。
                SpUitlsInfo.putString(GuideActivity.this, "VERSION", "1");
                startActivity(new Intent(GuideActivity.this, MainActivity.class));
                break;
            default:
                break;
        }
    }
 
    
    private void initPoint() {
        //这里实例化LinearLayout
        llGuidePoint = findViewById(R.id.ll_guide_point);
        //根据ViewPager的item数量实例化数组
        ivPointArray = new ImageView[viewList.size()];
        //循环新建底部圆点ImageView，将生成的ImageView保存到数组中
        int size = viewList.size();
        for (int i = 0; i < size; i++) {
            iv_point = new ImageView(this);
            LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT);
            //设置小圆点的间距
            lp.setMargins(20, 0, 20, 0);
            iv_point.setLayoutParams(lp);
            ivPointArray[i] = iv_point;
            //第一个页面需要设置为选中状态，这里采用两张不同的图片
            if (i == 0) {
                iv_point.setBackgroundResource(R.drawable.guide_dot_select);
            } else {
                iv_point.setBackgroundResource(R.drawable.guide_dot_unselect);
            }
            //将数组中的ImageView加入到ViewGroup
            llGuidePoint.addView(ivPointArray[i]);
        }
    }
 
    
    private void initViewPager() {
        //实例化图片资源
        imagePositionArray = new int[]{R.mipmap.img_guide_one, R.mipmap.img_guide_two, R.mipmap.img_guide_three,
                R.mipmap.img_guide_four};
        viewList = new ArrayList<>();
        //获取一个Layout参数，设置为全屏
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
        //循环创建View并加入到集合中
        int len = imagePositionArray.length;
        for (int i = 0; i < len; i++) {
            //new ImageView并设置全屏和图片资源
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(params);
            imageView.setBackgroundResource(imagePositionArray[i]);
            //将ImageView加入到集合中
            viewList.add(imageView);
        }
 
        //View集合初始化好后，设置Adapter
        guideVp.setAdapter(new GuidePageAdapter(viewList));
        //设置滑动监听
        guideVp.setOnPageChangeListener(this);
    }
 
    @Override
    public void onResult(Object result, String message) {
 
    }
 
    @Override
    public void onError(Throwable throwable, String message) {
 
    }
 
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
 
    }
 
    
    @Override
    public void onPageSelected(int position) {
        //循环设置当前页的标记图
        int length = imagePositionArray.length;
        for (int i = 0; i < length; i++) {
            ivPointArray[position].setBackgroundResource(R.drawable.guide_dot_select);
            if (position != i) {
                ivPointArray[i].setBackgroundResource(R.drawable.guide_dot_unselect);
            }
        }
        //判断是否是最后一页，若是则显示按钮
        if (position == imagePositionArray.length - 1) {
            guideIbStart.setVisibility(View.VISIBLE);
        } else {
            guideIbStart.setVisibility(View.GONE);
        }
    }
 
    @Override
    public void onPageScrollStateChanged(int state) {
 
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ButterKnife.bind(this);
    }
 
}

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
 
    <solid android:color="@color/white"></solid>
    <corners android:radius="3Dp" />
    <size
        android:width="8dp"
        android:height="8dp" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@color/colorPrimaryDark"></solid>
    <corners android:radius="3dp" />
    <size
        android:width="8dp"
        android:height="8dp" />
</shape>