Android(安卓)滑动渐变 扩展效果 免费专区
16lz
2021-01-26
<?xml version="1.0" encoding="utf-8"?>
public class FreeActivity extends BaseActivity { private int llTopRootHeight; private int changeHeight; @Override protected int getLayoutId() { return R.layout.activity_free; } @Override public boolean setFitSystemWindow() { return false; } @Override protected void initBar() { // 设置允许布局超出状态栏 BarUtils.transparentStatusBar(this); // 设置白底黑子模式 BarUtils.setStatusBarLightMode(this, false); } @Override protected void getBundleExtras(Bundle extras) { } @Override protected void initView() { // 设置自定义顶上去的布局为状态栏的高度 覆盖效果 mViewBinding.viewStatusBar2.getLayoutParams().height = BarUtils.getStatusBarHeight(); //设置默认隐藏 mViewBinding.lltop.setAlpha(0); BarUtils.addMarginTopEqualStatusBarHeight(mViewBinding.frame); //设置顶部图片的高度 防止图片拉伸// int ivTopHeight = ScreenUtils.getAppScreenWidth() * 486 / 750;// mViewBinding.ivTop.getLayoutParams().height = ivTopHeight; //布局里边butFlag 的高度 int dimension = (int) getResources().getDimension(R.dimen.x100); //获取控件的试图观察者,以便通过试图观察者得到控件的宽高参数 ViewTreeObserver viewTreeObserver = mViewBinding.ivTop.getViewTreeObserver(); //添加观察者监听 viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { //回调监听后首先移除该监听 占资源 mViewBinding.ivTop.getViewTreeObserver().removeOnGlobalLayoutListener(this); //得到高度 changeHeight = mViewBinding.ivTop.getHeight() - dimension; mViewBinding.scrollview.setObserveHeight(changeHeight);//这里需要计算下图向上的覆盖距离 //获取控件的试图观察者,以便通过试图观察者得到控件的宽高参数 ViewTreeObserver viewTreeObserverTop = mViewBinding.llTopRoot.getViewTreeObserver(); //添加观察者监听 viewTreeObserverTop.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { //回调监听后首先移除该监听 占资源 mViewBinding.llTopRoot.getViewTreeObserver().removeOnGlobalLayoutListener(this); //得到高度 llTopRootHeight = mViewBinding.llTopRoot.getHeight() - dimension; } }); } }); //动态设置marginTop// LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) mViewBinding.llZongzhi.getLayoutParams();// layoutParams.topMargin = -180;// mViewBinding.llZongzhi.setLayoutParams(layoutParams);////// mViewBinding.scrollviewFragmy.setObserveHeight(ivTopHeight - 180);//这里需要计算下图向上的覆盖距离//// LinearLayout.LayoutParams layoutParamsb = (LinearLayout.LayoutParams) mViewBinding.butFlag.getLayoutParams();// layoutParams.topMargin = -180;// mViewBinding.butFlag.setLayoutParams(layoutParams); } @Override protected void initData() { } @Override protected void initListener() { mViewBinding.butFlag2.setVisibility(View.INVISIBLE); mViewBinding.butFlag.setVisibility(View.VISIBLE); mViewBinding.ivBack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); mViewBinding.ivBack1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); // 监听高度变化 获取 对应的透明度 mViewBinding.scrollview.setAlphaChangeListener(new ObserveAlphaScrollView.AlphaChangeListener() { @Override public void alphaChanging(float alpha, int height) { mViewBinding.lltop.setAlpha(alpha); if (alpha == 1) { mViewBinding.butFlag2.setVisibility(View.VISIBLE); mViewBinding.butFlag.setVisibility(View.INVISIBLE); //设置黑字模式 黑图 BarUtils.setStatusBarLightMode(FreeActivity.this, true); mViewBinding.ivShare.setImageResource(R.drawable.share_black); mViewBinding.ivBack.setImageResource(R.drawable.toleftblack); } else { //设置白字模式 白图 BarUtils.setStatusBarLightMode(FreeActivity.this, false); mViewBinding.ivShare.setImageResource(R.drawable.share_white); mViewBinding.ivBack.setImageResource(R.drawable.toleftwhite); if (llTopRootHeight <= height) { mViewBinding.butFlag2.setVisibility(View.INVISIBLE); mViewBinding.butFlag.setVisibility(View.VISIBLE); } if (alpha <= llTopRootHeight/changeHeight) { mViewBinding.butFlag2.setVisibility(View.INVISIBLE); mViewBinding.butFlag.setVisibility(View.VISIBLE); } } } }); }}
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