android viewPage 打造3d画廊

之前学习时学习了ViewPager打造3d画廊,今天找出来把他贴上去,给需要的小伙伴用！废话不多说直接贴！

 

一、Activity

/**
 * 3da 画廊
 */
public class Main3Activity extends AppCompatActivity {

    private int[] imgResourceArray = new int[]{R.mipmap.three_d_gallery1, R.mipmap.three_d_gallery2,
            R.mipmap.three_d_gallery3, R.mipmap.three_d_gallery4};
    private ArrayList<ImageView> imageViewArrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        initData();
        initView();
    }

    private void initData() {
        for (int i = 0; i < imgResourceArray.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            //3、 为imageview生成的带犹豫倒影的bitmap
            imageView.setImageBitmap(ImageUtil.getReverseBitmapById(imgResourceArray[i], Main3Activity.this));
            imageViewArrayList.add(imageView);
        }
    }

    private void initView() {
        final ViewPager viewPager = findViewById(R.id.vp);
        Adapter adapter = new Adapter();
        viewPager.setAdapter(adapter);
        viewPager.setPageTransformer(true, new MyTransformation());//设置当一个页面滑入和滑出的过度特效
        //2、为解决触摸滑动ViewPager左右两边的页面无反应的问题:　需要为ViewPager的父容器设置OnTouchListener，将触摸事件传递给ViewPager
        findViewById(R.id.all).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                return viewPager.dispatchTouchEvent(motionEvent);
            }
        });
    }

    private class Adapter extends PagerAdapter {
        @Override
        public int getCount() {
            return imageViewArrayList.size();
        }

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

        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            container.addView(imageViewArrayList.get(position));
            return imageViewArrayList.get(position);
        }

        @Override
        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
            container.removeView((View) object);
        }
    }
}

 

二、布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/all"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000"
    android:clipChildren="false"
    android:orientation="vertical"
    tools:context=".study10_17.Main3Activity">

    <!--1、为解决不在ViewPager中间页面被剪掉的问题:
    viewPager及其父容器中加入android:clipChildren="false" 必要属性-->
    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="150dp"
        android:layout_marginLeft="80dp"
        android:layout_marginRight="80dp"
        android:layout_marginTop="50dp"
        android:clipChildren="false" />

</LinearLayout>

三、其他工具/控件类 

public class ImageUtil {
    public static Bitmap getReverseBitmapById(int resId, Context context) {//构建出该图片的倒影 并返回构建过倒影的图片
        Bitmap sourceBitmap = BitmapFactory.decodeResource(context.getResources(), resId);
        Matrix matrix = new Matrix();
        matrix.setScale(1, -1);
        Bitmap inverseBitmap = Bitmap.createBitmap(sourceBitmap, 0, sourceBitmap.getHeight() / 2, sourceBitmap.getWidth(), sourceBitmap.getHeight() / 3, matrix, false);
        Bitmap groupbBitmap = Bitmap.createBitmap(sourceBitmap.getWidth(), sourceBitmap.getHeight() + sourceBitmap.getHeight() / 3 + 60, sourceBitmap.getConfig());
        Canvas gCanvas = new Canvas(groupbBitmap);
        gCanvas.drawBitmap(sourceBitmap, 0, 0, null);
        gCanvas.drawBitmap(inverseBitmap, 0, sourceBitmap.getHeight() + 15, null);//top中+ number ,number为图片和倒影图片的距离
        Paint paint = new Paint();
        Shader.TileMode tileMode = Shader.TileMode.CLAMP;
        LinearGradient shader = new LinearGradient(0, sourceBitmap.getHeight() + 50, 0,
                groupbBitmap.getHeight(), Color.BLACK, Color.TRANSPARENT, tileMode);
        paint.setShader(shader);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        gCanvas.drawRect(0, sourceBitmap.getHeight() + 50, sourceBitmap.getWidth(), groupbBitmap.getHeight(), paint);
        return groupbBitmap;
    }
}

public class MyTransformation implements ViewPager.PageTransformer {

    private static final float MIN_SCALE=0.85f;
    private static final float MIN_ALPHA=0.5f;
    private static final float MAX_ROTATE=30;
    private Camera camera=new Camera();
    @Override
    public void transformPage(View page, float position) {float scaleFactor=Math.max(MIN_SCALE,1-Math.abs(position));
        float rotate=20*Math.abs(position);
        if (position<-1){

        }else if (position<0){
            page.setScaleX(scaleFactor);
            page.setScaleY(scaleFactor);
            page.setRotationY(rotate);
        }else if (position>=0&&position<1){
            page.setScaleX(scaleFactor);
            page.setScaleY(scaleFactor);
            page.setRotationY(-rotate);
        }
        else if (position>=1) {
            page.setScaleX(scaleFactor);
            page.setScaleY(scaleFactor);
            page.setRotationY(-rotate);
        }
    }
}

 

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