Android语言用实现广告页轮播、打造卡片切换、卡片缩放动画的代码

以下是Android语言实现广告页轮播、打造卡片切换、卡片缩放动画的代码示例：

1. 广告页轮播

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private List<ImageView> imageList;
    private int[] imageIds = {R.drawable.ad1, R.drawable.ad2, R.drawable.ad3};
    private List<View> dotList;
    private int currentItem = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initDot();
        viewPager.setAdapter(new MyPagerAdapter());
        viewPager.setCurrentItem(Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2 % imageIds.length);
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                int newPosition = position % imageList.size();
                for (int i = 0; i < dotList.size(); i++) {
                    if (i == newPosition) {
                        dotList.get(i).setBackgroundResource(R.drawable.dot_selected);
                    } else {
                        dotList.get(i).setBackgroundResource(R.drawable.dot_normal);
                    }
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    currentItem++;
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
                        }
                    });
                }
            }
        }).start();
    }

    private void initView() {
        viewPager = findViewById(R.id.viewPager);
        imageList = new ArrayList<>();
        for (int i = 0; i < imageIds.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(imageIds[i]);
            imageList.add(imageView);
        }
    }

    private void initDot() {
        LinearLayout dotLayout = findViewById(R.id.dotLayout);
        dotList = new ArrayList<>();
        for (int i = 0; i < imageIds.length; i++) {
            View dotView = new View(this);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(20, 20);
            layoutParams.leftMargin = 10;
            layoutParams.rightMargin = 10;
            dotView.setLayoutParams(layoutParams);
            if (i == 0) {
                dotView.setBackgroundResource(R.drawable.dot_selected);
            } else {
                dotView.setBackgroundResource(R.drawable.dot_normal);
            }
            dotLayout.addView(dotView);
            dotList.add(dotView);
        }
    }

    private class MyPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @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 = imageList.get(position % imageList.size());
            container.addView(imageView);
            return imageView;
        }

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

2. 卡片切换

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private List<View> viewList;
    private int[] imageIds = {R.drawable.card1, R.drawable.card2, R.drawable.card3};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        viewPager.setAdapter(new MyPagerAdapter());
        viewPager.setPageTransformer(true, new ZoomOutPageTransformer());
    }

    private void initView() {
        viewPager = findViewById(R.id.viewPager);
        viewList = new ArrayList<>();
        for (int i = 0; i < imageIds.length; i++) {
            View view = LayoutInflater.from(this).inflate(R.layout.item_viewpager, null);
            ImageView imageView = view.findViewById(R.id.imageView);
            imageView.setImageResource(imageIds[i]);
            viewList.add(view);
        }
    }

    private class MyPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return viewList.size();
        }

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

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

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

    private class ZoomOutPageTransformer implements ViewPager.PageTransformer {

        private static final float MIN_SCALE = 0.85f;
        private static final float MIN_ALPHA = 0.5f;

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

            if (position < -1) {
                page.setAlpha(0f);
            } else if (position <= 1) {
                float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
                float vertMargin = pageHeight * (1 - scaleFactor) / 2;
                float horzMargin = pageWidth * (1 - scaleFactor) / 2;
                if (position < 0) {
                    page.setTranslationX(horzMargin - vertMargin / 2);
                } else {
                    page.setTranslationX(-horzMargin + vertMargin / 2);
                }
                page.setScaleX(scaleFactor);
                page.setScaleY(scaleFactor);
                page.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA));
            } else {
                page.setAlpha(0f);
            }
        }
    }
}

3. 卡片缩放动画

public class MainActivity extends AppCompatActivity {
    private CardView cardView1, cardView2, cardView3;
    private TextView textView1, textView2, textView3;
    private boolean isCard1Expanded = false;
    private boolean isCard2Expanded = false;
    private boolean isCard3Expanded = false;

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

    private void initView() {
        cardView1 = findViewById(R.id.cardView1);
        cardView2 = findViewById(R.id.cardView2);
        cardView3 = findViewById(R.id.cardView3);
        textView1 = findViewById(R.id.textView1);
        textView2 = findViewById(R.id.textView2);
        textView3 = findViewById(R.id.textView3);
    }

    private void initListener() {
        cardView1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isCard1Expanded) {
                    isCard1Expanded = false;
                    textView1.setVisibility(View.GONE);
                    cardView1.animate().scaleX(1.0f).scaleY(1.0f).setDuration(500).start();
                } else {
                    isCard1Expanded = true;
                    textView1.setVisibility(View.VISIBLE);
                    cardView1.animate().scaleX(1.2f).scaleY(1.2f).setDuration(500).start();
                }
            }
        });

        cardView2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isCard2Expanded) {
                    isCard2Expanded = false;
                    textView2.setVisibility(View.GONE);
                    cardView2.animate().scaleX(1.0f).scaleY(1.0f).setDuration(500).start();
                } else {
                    isCard2Expanded = true;
                    textView2.setVisibility(View.VISIBLE);
                    cardView2.animate().scaleX(1.2f).scaleY(1.2f).setDuration(500).start();
                }
            }
        });

        cardView3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isCard3Expanded) {
                    isCard3Expanded = false;
                    textView3.setVisibility(View.GONE);
                    cardView3.animate().scaleX(1.0f).scaleY(1.0f).setDuration(500).start();
                } else {
                    isCard3Expanded = true;
                    textView3.setVisibility(View.VISIBLE);
                    cardView3.animate().scaleX(1.2f).scaleY(1.2f).setDuration(500).start();
                }
            }
        });
    }
}