Android 引导页的代码

布局代码

<android.support.v4.view.ViewPager

    android:id="@+id/viewpage"

    android:layout_width="match_parent"

    android:layout_height="match_parent" />

<!--android:background="@drawable/btnselector"-->

<Button

    android:id="@+id/btnty"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_alignParentBottom="true"

    android:layout_centerHorizontal="true"

    android:layout_marginBottom="100dp"

    android:background="@drawable/btnselector"

    android:paddingLeft="30dp"

    android:paddingRight="30dp"

    android:visibility="gone"

    android:text="立即体验"

    android:textColor="@drawable/textselector"

    android:textSize="20sp" />

<RelativeLayout

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_alignParentBottom="true"

    android:layout_centerHorizontal="true"

    android:layout_marginBottom="80dp">

    <LinearLayout

        android:id="@+id/linearpointgroup"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:orientation="horizontal" />

    <ImageView

        android:id="@+id/ivredpoint"

        android:background="@drawable/pointred"

        android:layout_width="10dp"

        android:layout_height="10dp" />

</RelativeLayout>

后台代码

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.View;

import android.view.ViewGroup;

import android.view.ViewTreeObserver;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.RelativeLayout;

import java.util.ArrayList;

import java.util.List;

public class GuideActivity extends Activity {

List<ImageView> imageViews;

ViewPager vpage;

LinearLayout linearLayout;

ImageView imagepoint;

int leftmax = 0;

Button btnty;

int pointwidth=0;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_guide);

vpage = (ViewPager) findViewById(R.id.viewpage);

linearLayout = (LinearLayout) findViewById(R.id.linearpointgroup);

imagepoint = (ImageView) findViewById(R.id.ivredpoint);

//10为默认点的布局宽度

pointwidth=DensityUtil.diptopx(GuideActivity.this,10);

btnty = (Button) findViewById(R.id.btnty);

int[] intimage = new int[]{R.drawable.guide1, R.drawable.guide2, R.drawable.guide3};

imageViews = new ArrayList<>();

for (int ii = 0; ii < intimage.length; ii++) {

ImageView imageView = new ImageView(GuideActivity.this);

imageView.setBackgroundResource(intimage[ii]);

imageViews.add(imageView);

//创建点

        ImageView point = new ImageView(GuideActivity.this);

        point.setBackgroundResource(R.drawable.point);

        //此处单位是像素 需要做大小手机的适配 调用转换成像素的方法

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(pointwidth, pointwidth);

        if (ii != 0) {

            params.leftMargin = pointwidth;

        }

        point.setLayoutParams(params);

        linearLayout.addView(point);

    }

    vpage.setAdapter(new pagetadapter());

    Button btn = (Button) findViewById(R.id.btnty);

    btn.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            //设置缓存  进入过主界面

            CacheParam.setkey(GuideActivity.this, "EnterMain", true);

            Intent intent = new Intent(GuideActivity.this, LogInActivity.class);

            startActivity(intent);

            finish();

        }

    });

    imagepoint.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

        @Override

        public void onGlobalLayout() {

            //执行一次即可 所以 先移除

            imagepoint.getViewTreeObserver().removeGlobalOnLayoutListener(this);

            //间距 = 第一个点距离左边的距离-第0个点距离左边的距离

            leftmax = linearLayout.getChildAt(1).getLeft() - linearLayout.getChildAt(0).getLeft();

        }

    });

    vpage.setOnPageChangeListener(new MyPageChange());

}

class MyPageChange implements ViewPager.OnPageChangeListener {

    //当也没滑动的时候调用

    /*

     * 当前滑动页面的位置

     * 页面滑动的百分比

     * 滑动的像素*/

    @Override

    public void onPageScrolled(int position, float positionoffset, int positionoffsetpixels) {

//两点间滑动距离对应的坐标=原来的起始位置+两点间移动的距离

int leftmargin = (int) (position * leftmax + (positionoffset * leftmax));

        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) imagepoint.getLayoutParams();

        params.leftMargin = leftmargin;

        imagepoint.setLayoutParams(params);

    }

    /**

     * 当页面选中的时候调用这个方法

     * 被选中页面的位置

     */

    @Override

    public void onPageSelected(int position) {

        //最后一个页面

        if (position == imageViews.size() - 1) {

            btnty.setVisibility(View.VISIBLE);

        } else//其他页面

        {

            btnty.setVisibility(View.GONE);

        }

    }

    /**

     * 当页面滑动状态变化的时候

     */

    @Override

    public void onPageScrollStateChanged(int i) {

    }

}

class pagetadapter extends PagerAdapter {

    @Override

    public int getCount() {

        return imageViews.size();

    }

    @Override

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

        ImageView imageView = imageViews.get(position);

        container.addView(imageView);

        return imageView;

    }

    @Override

    public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {

        return view == o;

    }

    @Override

    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {

// super.destroyItem(container, position, object);

container.removeView((View) object);

}

}

import android.content.Context;

public class DensityUtil {

/*

* 根据手机的分辨率从dip的单位转为px 像素/

public static int diptopx(Context context,float dpvalue)

{

final float scale=context.getResources().getDisplayMetrics().density;

return (int)(dpvaluescale+0.5f);

}

/*

* 根据手机的分辨率从px的单位转为dip

* */

public static int pxtodip(Context context,float pxvalue)

{

final float scale=context.getResources().getDisplayMetrics().density;

return (int)(pxvalue/scale+0.5f);

}

}

巴特西

Android 引导页的代码

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