上图的动画其实挺简单的，如果你知道的话，就不要继续往下看了，那是在浪费时间。
主要用的前几年推出的几个support包，可惜国内没有流行起来。
简单直接放代码：
gradle依赖：
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| implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:28.0.0-rc01'
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布局文件：
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| <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="160dp"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:collapsedTitleTextAppearance="@style/TextAppearance.AppCompat.Title"
app:contentScrim="?attr/colorPrimaryDark"
app:expandedTitleMarginStart="48dp"
app:expandedTitleTextAppearance="@style/TextAppearance.AppCompat.Title"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:scaleType="fitXY"
android:src="@drawable/title_bg"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.5" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
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activity代码：
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public class MainActivity extends AppCompatActivity {
private List<String> data = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
CollapsingToolbarLayout collapsingToolbarLayout = findViewById(R.id.collapsingToolbarLayout);
collapsingToolbarLayout.setTitle("Test CoordinatorLayout");
collapsingToolbarLayout.setContentScrimColor(Color.GRAY);
collapsingToolbarLayout.setCollapsedTitleTextColor(ContextCompat.getColor(this,R.color.colorAccent));
collapsingToolbarLayout.setExpandedTitleColor(Color.WHITE);
for(int i = 0 ; i < 100 ;i ++){
data.add("item -- >" + i);
}
RecyclerView recyclerView = findViewById(R.id.recyclerview);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(MainActivity.this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);
RecyclerViewAdapter adapter = new RecyclerViewAdapter();
recyclerView.setAdapter(adapter);
}
class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(MainActivity.this).inflate(android.R.layout.simple_list_item_1,viewGroup,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
viewHolder.textView.setText(data.get(i));
viewHolder.textView.setTextColor(ContextCompat.getColor(MainActivity.this,R.color.colorAccent));
}
@Override
public int getItemCount() {
return data.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
TextView textView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(android.R.id.text1);
}
}
}
}
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不想多写什么了，可以自己去搜这些东西的用法。傲娇脸_
以上