Whatsapp 喜欢折叠工具栏 [英] Whatsapp like Collapsing Toolbar
本文介绍了Whatsapp 喜欢折叠工具栏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的应用程序中，我想实现像可折叠工具栏一样的 Whatsapp 主页.也就是说，在向下滚动列表时，工具栏应该向上并且选项卡应该固定在顶部.我怎样才能做到这一点?
这是我的应用栏布局
In my app, I would like to implement Whatsapp home page like collapsible toolbar. That is, while scrolling down the list, the toolbar should go up and the tabs should pin at the top. How can I achieve this?
Here is my appbar layout
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/appbarLayout"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/collapsibleToolBarLayout"
android:fitsSystemWindows="true"
app:titleEnabled="false"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/white"
app:tabTextColor="@color/product_page_btn_grey"
app:tabSelectedTextColor="@color/upcomer_background_red"
app:tabIndicatorColor="@color/upcomer_background_red"
android:layout_gravity="bottom"
app:layout_scrollFlags="scroll|enterAlways"
app:tabContentStart="72dp" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.9"
android:background="@color/upcomer_background_red"
app:popupTheme="@style/AppTheme.PopupOverlay" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/title_image_view"
android:contentDescription="@null"
android:layout_gravity="start|center_vertical"
android:visibility="gone"
android:src="@drawable/title"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/title_layout"
android:visibility="gone">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:id="@+id/toolbarText"
style="@android:style/TextAppearance.DeviceDefault.Widget.ActionBar.Title"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/send_button"
android:layout_marginRight="10dp"
android:layout_marginEnd="10dp"
android:text="@string/send_text"
android:textColor="@color/white"
android:textSize="18sp"
android:textStyle="bold"
android:visibility="gone"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
Now the TabLayout is not visible and the Toolbar stays there even though the list in the ViewPager below is scrolled. Kindly help.
解决方案 In order to achieve this functionality a CollapsingToolbarLayout is actually not needed, you can just collapse the Toolbar that is set as the ActionBar.
Here is sample code using a Toolbar for the ActionBar that will collapse, and a TabLayout with a ViewPager.
First ensure that the style used for MainActivity is one that does not have an ActionBar, e.g.:
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.NoActionBar">
<!-- ....... -->
</style>
MainActivity.java, that has the FragmentPagerAdapter and sets up the tabs:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Get the ViewPager and set it's PagerAdapter so that it can display items
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
PagerAdapter pagerAdapter =
new PagerAdapter(getSupportFragmentManager(), MainActivity.this);
viewPager.setAdapter(pagerAdapter);
// Give the TabLayout the ViewPager
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(viewPager);
// Iterate over all tabs and set the custom view
for (int i = 0; i < tabLayout.getTabCount(); i++) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(pagerAdapter.getTabView(i));
}
}
@Override
public void onResume() {
super.onResume();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
class PagerAdapter extends FragmentPagerAdapter {
String tabTitles[] = new String[] { "Tab One", "Tab Two", "Tab Three" };
Context context;
public PagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
@Override
public int getCount() {
return tabTitles.length;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new BlankFragment();
case 1:
return new BlankFragment();
case 2:
return new BlankFragment();
}
return null;
}
@Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
public View getTabView(int position) {
View tab = LayoutInflater.from(MainActivity.this).inflate(R.layout.custom_tab, null);
TextView tv = (TextView) tab.findViewById(R.id.custom_text);
tv.setText(tabTitles[position]);
return tab;
}
}
}
activity_main.xml
The important parts:
- Use a CoordinatorLayout
- Use
app:layout_scrollFlags="scroll|enterAlways|snap" in the Toolbar
properties
- Use
app:layout_behavior="@string/appbar_scrolling_view_behavior" in
the ViewPager properties
Here is the activity_main.xml file:
<android.support.design.widget.CoordinatorLayout
android:id="@+id/main_layout"
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"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="6dp">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:elevation="0dp"
app:layout_scrollFlags="scroll|enterAlways|snap"
/>
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
app:tabMode="fixed"
android:layout_below="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:elevation="0dp"
app:tabTextColor="#d3d3d3"
app:tabSelectedTextColor="#ffffff"
app:tabIndicatorColor="#ff00ff"
android:minHeight="?attr/actionBarSize"
/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_below="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>
custom_tab.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/custom_text"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:background="?attr/selectableItemBackground"
android:gravity="center"
android:textSize="16dip"
android:textColor="#ffffff"
android:singleLine="true"
/>
</LinearLayout>
BlankFragment.java, this simply adds enough items to make it scroll:
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;;
public class BlankFragment extends Fragment {
public BlankFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_blank, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
rv.setHasFixedSize(true);
MyAdapter adapter = new MyAdapter(new String[]{"test one", "test two", "test three", "test four", "test five" , "test six" , "test seven", "test eight" , "test nine"});
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
fragment_blank.xml, it's important to use a RecyclerView, or any other View that supports nested scrolling, such as a NestedScrollView
(side note: you can call setNestedScrollingEnabled(true) on api-21 and up to make it work with a ListView):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.SearchView
android:id="@+id/sv_search"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Search!"
android:singleLine="true"
android:inputType="textNoSuggestions"
android:layout_gravity="start"
android:layout_marginRight="18dp"
android:ems="10" >
</android.support.v7.widget.SearchView>
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_recycler_view"
android:layout_below="@+id/sv_search"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
MyAdapter.java, the RecyclerView Adapter:
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private String[] mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder {
public CardView mCardView;
public TextView mTextView;
public MyViewHolder(View v) {
super(v);
mCardView = (CardView) v.findViewById(R.id.card_view);
mTextView = (TextView) v.findViewById(R.id.tv_text);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
// set the view's size, margins, paddings and layout parameters
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.mTextView.setText(mDataset[position]);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
card_item.xml, the circle image and the "blah blah blah" String are both static content, only the tv_text TextView is updated from the data source for this simple example:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="68dp" >
<android.support.v7.widget.CardView
android:id="@+id/card_view"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_margin="10dp"
android:layout_height="62dp"
card_view:cardCornerRadius="4dp"
card_view:elevation="14dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/iv_image"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/abc_btn_radio_material">
</ImageView>
<TextView
android:id="@+id/tv_text"
android:layout_toRightOf ="@+id/iv_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center" >
</TextView>
<TextView
android:id="@+id/tv_blah"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="blah blah blah......"
android:layout_below="@+id/tv_text"
android:layout_toRightOf="@+id/iv_image"
android:layout_toEndOf="@+id/iv_image">
</TextView>
</RelativeLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
build.gradle dependencies:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'com.android.support:design:23.0.1'
compile 'com.android.support:cardview-v7:23.0.1'
compile 'com.android.support:recyclerview-v7:23.0.1'
}
Result:
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