通过Android Studio设计和实现一个简单的图片浏览器，具体包括：通过Bitmap对象实现图片显示，通过动画渐变实现图片翻页.

好的，下面是实现步骤：

1. 在Android Studio中创建一个新项目，并在布局文件中添加一个ImageView控件用于显示图片。

2. 创建一个类用于管理图片，例如ImageManager类。在该类中，我们可以使用BitmapFactory类将图片文件转换为Bitmap对象。

3. 实现图片翻页的动画效果。这可以通过使用AnimatorSet和ObjectAnimator类来实现。我们可以创建两个ObjectAnimator对象，一个用于改变当前图片的alpha值，另一个用于改变下一张图片的alpha值。然后将它们添加到AnimatorSet对象中，使用setDuration()方法设置动画持续时间，使用setInterpolator()方法设置动画插值器，最后调用start()方法启动动画。

4. 在Activity中实现图片的翻页功能。我们可以使用ViewPager控件来实现这一功能。首先，我们需要将所有要显示的图片文件的路径存储在一个数组中。然后，我们可以创建一个PagerAdapter类，用于管理ViewPager中的页面。在该类中，我们可以使用ImageManager类从文件路径中加载图片，并将其显示在ImageView控件中。

5. 最后，在Activity中创建一个ViewPager控件，并将PagerAdapter对象设置为其适配器。然后，我们可以使用ViewPager.setOnPageChangeListener()方法来监听页面变化事件，并在事件发生时启动动画效果。

完整代码示例：

布局文件：activity_main.xml

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

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        tools:ignore="ContentDescription" />

</RelativeLayout>

ImageManager类：

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class ImageManager {

    private static final int DEFAULT_WIDTH = 800;
    private static final int DEFAULT_HEIGHT = 800;

    public static Bitmap getBitmap(String filePath) {
        return getBitmap(filePath, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public static Bitmap getBitmap(String filePath, int reqWidth, int reqHeight) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);

        final int width = options.outWidth;
        final int height = options.outHeight;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            while ((halfHeight / inSampleSize) >= reqHeight && (halfWidth / inSampleSize) >= reqWidth) {
                inSampleSize *= 2;
            }
        }

        options.inSampleSize = inSampleSize;
        options.inJustDecodeBounds = false;

        return BitmapFactory.decodeFile(filePath, options);
    }

}

MainActivity类：

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.animation.AccelerateDecelerateInterpolator;

public class MainActivity extends AppCompatActivity {

    private String[] mImagePaths = {
            "/sdcard/DCIM/Camera/IMG_0001.JPG",
            "/sdcard/DCIM/Camera/IMG_0002.JPG",
            "/sdcard/DCIM/Camera/IMG_0003.JPG",
            "/sdcard/DCIM/Camera/IMG_0004.JPG"
    };

    private ViewPager mViewPager;
    private ImagePagerAdapter mAdapter;
    private int mCurrentPosition = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mViewPager = findViewById(R.id.viewPager);
        mAdapter = new ImagePagerAdapter();
        mViewPager.setAdapter(mAdapter);
        mViewPager.setCurrentItem(mCurrentPosition);
        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                // Do nothing
            }

            @Override
            public void onPageSelected(int position) {
                if (position > mCurrentPosition) {
                    animateTransition(R.animator.slide_in_right, R.animator.slide_out_left);
                } else if (position < mCurrentPosition) {
                    animateTransition(R.animator.slide_in_left, R.animator.slide_out_right);
                }
                mCurrentPosition = position;
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                // Do nothing
            }
        });
    }

    private void animateTransition(int inAnimatorId, int outAnimatorId) {
        ObjectAnimator fadeOut = ObjectAnimator.ofFloat(mViewPager, "alpha", 1f, 0f);
        ObjectAnimator fadeIn = ObjectAnimator.ofFloat(mViewPager, "alpha", 0f, 1f);

        AnimatorSet set = new AnimatorSet();
        set.play(fadeOut).with(ObjectAnimator.ofFloat(mViewPager, "translationX", 0f, -mViewPager.getWidth()));
        set.play(fadeIn).with(ObjectAnimator.ofFloat(mViewPager, "translationX", mViewPager.getWidth(), 0f));
        set.setDuration(getResources().getInteger(android.R.integer.config_mediumAnimTime));
        set.setInterpolator(new AccelerateDecelerateInterpolator());

        mViewPager.setPageTransformer(true, new DepthPageTransformer());
        set.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mViewPager.setPageTransformer(true, null);
            }
        });
        set.playTogether(fadeOut, fadeIn);
        set.start();
    }

    private class ImagePagerAdapter extends PagerAdapter {

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

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

        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            ImageView imageView = new ImageView(MainActivity.this);
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            Bitmap bitmap = ImageManager.getBitmap(mImagePaths[position]);
            imageView.setImageBitmap(bitmap);
            container.addView(imageView);
            return imageView;
        }

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

    }

}

深度页面转换动画类：DepthPageTransformer.java

public class DepthPageTransformer implements ViewPager.PageTransformer {

    private static final float MIN_SCALE = 0.75f;

    @Override
    public void transformPage(@NonNull View view, float position) {
        int pageWidth = view.getWidth();

        if (position < -1) {
            view.setAlpha(0f);
        } else if (position <= 0) {
            view.setAlpha(1f);
            view.setTranslationX(0f);
            view.setScaleX(1f);
            view.setScaleY(1f);
        } else if (position <= 1) {
            view.setAlpha(1 - position);
            view.setTranslationX(pageWidth * -position);
            float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position));
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);
        } else {
            view.setAlpha(0f);
        }
    }

}

动画监听器类：AnimatorListenerAdapter.java

import android.animation.Animator;

public class AnimatorListenerAdapter implements Animator.AnimatorListener {

    @Override
    public void onAnimationStart(Animator animation) {
        // Do nothing
    }

    @Override
    public void onAnimationEnd(Animator animation) {
        // Do nothing
    }

    @Override
    public void onAnimationCancel(Animator animation) {
        // Do nothing
    }

    @Override
    public void onAnimationRepeat(Animator animation) {
        // Do nothing
    }

}

这样，一个简单的图片浏览器就完成了！