private void expand() {
//设置伸展状态时的布局
tvSearch.setText("搜索简书的内容和朋友");
RelativeLayout.LayoutParams LayoutParams = (RelativeLayout.LayoutParams) mSearchLayout.getLayoutParams();
LayoutParams.width = LayoutParams.MATCH_PARENT;
LayoutParams.setMargins(dip2px(10), dip2px(10), dip2px(10), dip2px(10));
mSearchLayout.setLayoutParams(LayoutParams);
//设置动画
beginDelayedTransition(mSearchLayout);
}
private void reduce() {
//设置收缩状态时的布局
tvSearch.setText("搜索");
RelativeLayout.LayoutParams LayoutParams = (RelativeLayout.LayoutParams) mSearchLayout.getLayoutParams();
LayoutParams.width = dip2px(80);
LayoutParams.setMargins(dip2px(10), dip2px(10), dip2px(10), dip2px(10));
mSearchLayout.setLayoutParams(LayoutParams);
//设置动画
beginDelayedTransition(mSearchLayout);
}
void beginDelayedTransition(ViewGroup view) {
mSet = new AutoTransition();
//设置动画持续时间
mSet.setDuration(300);
// 开始表演
TransitionManager.beginDelayedTransition(view, mSet);
}
//scrollview滚动状态监听
mScrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
//改变toolbar的透明度
changeToolbarAlpha();
//滚动距离>=大图高度-toolbar高度 即toolbar完全盖住大图的时候 且不是伸展状态 进行伸展操作
if (mScrollView.getScrollY() >=ivImg.getHeight() - toolbar.getHeight() && !isExpand) {
expand();
isExpand = true;
}
//滚动距离<=0时 即滚动到顶部时 且当前伸展状态 进行收缩操作
else if (mScrollView.getScrollY()<=0&& isExpand) {
reduce();
isExpand = false;
}
}
});
}
private void changeToolbarAlpha() {
int scrollY = mScrollView.getScrollY();
//快速下拉会引起瞬间scrollY<0
if(scrollY<0){
toolbar.getBackground().mutate().setAlpha(0);
return;
}
//计算当前透明度比率
float radio= Math.min(1,scrollY/(ivImg.getHeight()-toolbar.getHeight()*1f));
//设置透明度
toolbar.getBackground().mutate().setAlpha( (int)(radio * 0xFF));
}
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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:layout_width="match_parent" android:layout_height="match_parent" android:background="#c2c0c0" > <ScrollView android:id="@+id/scrollView" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="none"> <FrameLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <FrameLayout android:layout_width="match_parent" android:layout_height="1500dp"> <ImageView android:id="@+id/iv_img" android:layout_width="match_parent" android:layout_height="180dp" android:scaleType="centerCrop" android:src="@drawable/night1" /> </FrameLayout> </FrameLayout> </ScrollView> <android.support.v7.widget.Toolbar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/toolbar" android:background="@android:color/white" android:fitsSystemWindows="true"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <LinearLayout android:id="@+id/ll_search" android:layout_width="80dp" android:layout_height="30dp" android:layout_alignParentRight="true" android:layout_marginRight="10dp" android:layout_marginTop="10dp" android:layout_marginBottom="10dp" android:background="@drawable/shape_bg" android:gravity="center"> <TextView android:id="@+id/tv_search" android:layout_width="wrap_content" android:layout_height="wrap_content" android:drawableLeft="@drawable/search" android:gravity="center_vertical" android:text="搜索" android:textColor="#8A8A8A" /> </LinearLayout> </RelativeLayout> </android.support.v7.widget.Toolbar> </RelativeLayout>
public class MainActivity extends AppCompatActivity {
@Bind(R.id.tv_search)
TextView tvSearch;
@Bind(R.id.ll_search)
LinearLayout mSearchLayout;
@Bind(R.id.scrollView)
ScrollView mScrollView;
boolean isExpand = false;
@Bind(R.id.iv_img)
ImageView ivImg;
@Bind(R.id.toolbar)
Toolbar toolbar;
private TransitionSet mSet;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
//设置全屏透明状态栏
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
ViewGroup rootView = (ViewGroup) ((ViewGroup)findViewById(android.R.id.content)).getChildAt(0);
ViewCompat.setFitsSystemWindows(rootView,false);
rootView.setClipToPadding(true);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS|
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN| View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(Color.TRANSPARENT);
}
//设置toolbar初始透明度为0
toolbar.getBackground().mutate().setAlpha(0);
//scrollview滚动状态监听
mScrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
//改变toolbar的透明度
changeToolbarAlpha();
//滚动距离>=大图高度-toolbar高度 即toolbar完全盖住大图的时候 且不是伸展状态 进行伸展操作
if (mScrollView.getScrollY() >=ivImg.getHeight() - toolbar.getHeight() && !isExpand) {
expand();
isExpand = true;
}
//滚动距离<=0时 即滚动到顶部时 且当前伸展状态 进行收缩操作
else if (mScrollView.getScrollY()<=0&& isExpand) {
reduce();
isExpand = false;
}
}
});
}
private void changeToolbarAlpha() {
int scrollY = mScrollView.getScrollY();
//快速下拉会引起瞬间scrollY<0
if(scrollY<0){
toolbar.getBackground().mutate().setAlpha(0);
return;
}
//计算当前透明度比率
float radio= Math.min(1,scrollY/(ivImg.getHeight()-toolbar.getHeight()*1f));
//设置透明度
toolbar.getBackground().mutate().setAlpha( (int)(radio * 0xFF));
}
private void expand() {
//设置伸展状态时的布局
tvSearch.setText("搜索简书的内容和朋友");
RelativeLayout.LayoutParams LayoutParams = (RelativeLayout.LayoutParams) mSearchLayout.getLayoutParams();
LayoutParams.width = LayoutParams.MATCH_PARENT;
LayoutParams.setMargins(dip2px(10), dip2px(10), dip2px(10), dip2px(10));
mSearchLayout.setLayoutParams(LayoutParams);
//开始动画
beginDelayedTransition(mSearchLayout);
}
private void reduce() {
//设置收缩状态时的布局
tvSearch.setText("搜索");
RelativeLayout.LayoutParams LayoutParams = (RelativeLayout.LayoutParams) mSearchLayout.getLayoutParams();
LayoutParams.width = dip2px(80);
LayoutParams.setMargins(dip2px(10), dip2px(10), dip2px(10), dip2px(10));
mSearchLayout.setLayoutParams(LayoutParams);
//开始动画
beginDelayedTransition(mSearchLayout);
}
void beginDelayedTransition(ViewGroup view) {
mSet = new AutoTransition();
mSet.setDuration(300);
TransitionManager.beginDelayedTransition(view, mSet);
}
private int dip2px(float dpVale) {
final float scale = getResources().getDisplayMetrics().density;
return (int) (dpVale * scale + 0.5f);
}
}
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