Android-WaterProject/app/src/main/java/com/ckkj/water/guide/GuideActivity.java

package com.ckkj.water.guide;

import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.core.content.ContextCompat;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;

import com.bumptech.glide.Glide;
import com.ckkj.water.AppConfig;
import com.ckkj.water.ConstantUtil;
import com.ckkj.water.R;
import com.ckkj.water.base.BaseActivity;
import com.ckkj.water.databinding.GuideActivityLayoutBinding;
import com.ckkj.water.login.entity.LoginEntity;
import com.ckkj.water.login.mvp.LoginContract;
import com.ckkj.water.login.mvp.LoginImpl;
import com.ckkj.water.login.mvp.LoginPresenter;
import com.ckkj.water.main.activity.MainActivity;
import com.ckkj.water.network.BaseBean;
import com.ckkj.water.utils.dataUtil.SharePreUtil;

import java.util.ArrayList;
import java.util.List;

public class GuideActivity extends BaseActivity<GuideActivityLayoutBinding, LoginPresenter>
        implements LoginContract.LoginView {

    private List<Drawable> mImgUrls = new ArrayList<>();
    private List<ImageView> mPointList = new ArrayList<>();
    private boolean mHasEnterAppFlag = false;
    private String desc[] = {"探索你的个性特征",
            "一键生成，智能排盘工具",
            "贴心提供每日生活指南"};

    private int[] guideDrawableIds = {
            R.mipmap.img_guide_1,
            R.mipmap.img_guide_2,
            R.mipmap.img_guide_3
    };

    @Override
    public LoginPresenter createPresenter() {
        return new LoginPresenter(new LoginImpl());
    }

    @Override
    public void initData(Bundle savedInstanceState) {
        super.initData(savedInstanceState);

        for (int resId : guideDrawableIds) {
            mImgUrls.add(ContextCompat.getDrawable(mContext, resId));
        }

        mHasEnterAppFlag = SharePreUtil.getBoolean(ConstantUtil.SHARE_PRE_NAME, mContext, ConstantUtil.FIRST_ENTER_APP_FLAG);

        if (!mHasEnterAppFlag) {
            viewBinding.viewpage.setAdapter(new MyAdapter());
            viewBinding.viewpage.setPageTransformer(true, new CrossFadePageTransformer());
            viewBinding.viewpage.setOffscreenPageLimit(1);

            viewBinding.viewpage.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                @Override
                public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                }

                @Override
                public void onPageSelected(int position) {
                    setPointSelect(position);
                    if (position == mImgUrls.size() - 1) {
                        viewBinding.tvStart.setVisibility(View.VISIBLE);
                        AlphaAnimation fadeIn = new AlphaAnimation(0f, 1f);
                        fadeIn.setDuration(400);
                        viewBinding.tvStart.startAnimation(fadeIn);
                    } else {
                        viewBinding.tvStart.setVisibility(View.INVISIBLE);
                    }
                }

                @Override
                public void onPageScrollStateChanged(int state) {
                }
            });
        }

        viewBinding.tvStart.setOnClickListener(v -> {
            SharePreUtil.putBoolean(ConstantUtil.SHARE_PRE_NAME, mContext, ConstantUtil.FIRST_ENTER_APP_FLAG, true);
            Intent intent = new Intent(mContext, MainActivity.class);
            startActivity(intent);
            finish();
        });
    }


    private void setPointSelect(int position) {
        for (int i = 0; i < mPointList.size(); i++) {
            mPointList.get(i).setImageResource(
                    i == position ? R.drawable.indicator_dot_selected : R.drawable.indicator_dot_normal);
        }
    }

    private int dp2px(float dp) {
        float density = getResources().getDisplayMetrics().density;
        return Math.round(dp * density);
    }

    @Override
    protected void initWidget() {
        super.initWidget();
    }

    @Override
    public void registerSuccess(BaseBean bean) {

    }

    @Override
    public void getPhoneCodeSuccess(BaseBean bean) {
    }

    @Override
    public void loginBySmsCodeSuccess(LoginEntity entity) {
    }

    @Override
    public void updateUserPasswordSuccess(BaseBean bean) {

    }

    class MyAdapter extends PagerAdapter {
        @Override
        public int getCount() {
            return mImgUrls.size();
        }

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

        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            FrameLayout page = new FrameLayout(mContext);
            page.setLayoutParams(new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
            ));

            ImageView imageView = new ImageView(mContext);
            imageView.setAdjustViewBounds(true);
            imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

            FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    Gravity.TOP | Gravity.CENTER_HORIZONTAL
            );
            imageView.setLayoutParams(lp);

            Glide.with(mContext).load(mImgUrls.get(position)).into(imageView);

            page.addView(imageView);
            container.addView(page);
            return page;
        }

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

    /**
     * Cross-fade page transition: outgoing page fades out (alpha 1→0),
     * incoming page fades in (alpha 0→1) simultaneously.
     */
    public class CrossFadePageTransformer implements ViewPager.PageTransformer {
        private static final float MIN_ALPHA = 0.0f;

        @Override
        public void transformPage(@NonNull View page, float position) {
            if (position < -1f) {
                page.setAlpha(MIN_ALPHA);
            } else if (position <= 0f) {
                page.setAlpha(1f + position);
            } else if (position <= 1f) {
                page.setAlpha(1f - position);
            } else {
                page.setAlpha(MIN_ALPHA);
            }
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.P)
    @Override
    public int getLayoutResId(Bundle savedInstanceState) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            hideStatusBar();
        }
        hideBottomUIMenu();
        return R.layout.guide_activity_layout;
    }

    @Override
    public void showError(String message) {
    }

    @Override
    public void logOut(BaseBean bean) {
    }

    @RequiresApi(api = Build.VERSION_CODES.P)
    protected void hideStatusBar() {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
        getWindow().setAttributes(lp);
    }

    protected void hideBottomUIMenu() {
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
        if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) {
            View v = this.getWindow().getDecorView();
            v.setSystemUiVisibility(View.GONE);
        } else if (Build.VERSION.SDK_INT >= 19) {
            View decorView = getWindow().getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }
}