本文基于常用的Toolbar+viewpager汇总（一）进行修改
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public class MainActivity extends AppCompatActivity {
private TabLayout tableLayout;
private ViewPager viewPager;
List<Fragment> list_fragment = new ArrayList<>();
private TabAdapter tabAdapter;
String[] favourites = {"页面一", "页面二", "页面三"};
private Toolbar toolbar;
private AppBarLayout appBarLayout;
private CollapsingToolbarLayout collapsingToolbarLayout;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initData() {
list_fragment.add(new DemoFragment());
list_fragment.add(new DemoFragment());
list_fragment.add(new DemoFragment());
tabAdapter = new TabAdapter(getSupportFragmentManager());
tableLayout.setupWithViewPager(viewPager);
viewPager.setAdapter(tabAdapter);
appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
@Override
public void onStateChanged(AppBarLayout appBarLayout, State state) {
if( state == State.EXPANDED ) {
//展开状态
toolbar.setBackgroundColor(Color.argb((int) 0, 0, 0, 0));
}else if(state == State.COLLAPSED){
//折叠状态
toolbar.setBackgroundColor(Color.argb((int) 255, 255, 255, 255));
}else {
//中间状态
toolbar.setBackgroundColor(Color.argb((int) 0, 0, 0, 0));
}
collapsingToolbarLayout.setTitle("标题");
collapsingToolbarLayout.setCollapsedTitleGravity(Gravity.CENTER);
}
});
}
class TabAdapter extends FragmentPagerAdapter {
public TabAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return list_fragment.get(position);
}
@Override
public int getCount() {
return list_fragment.size();
}
@Override
public CharSequence getPageTitle(int position) {
return favourites[position];
}
}
private void initView() {
tableLayout = (TabLayout) findViewById(R.id.tabs);
viewPager = (ViewPager) findViewById(R.id.viewpager);
toolbar = (Toolbar) findViewById(R.id.toolbar);
appBarLayout = (AppBarLayout) findViewById(R.id.app_bar);
collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.toolbar_layout);
imageView = (ImageView) findViewById(R.id.iv);
}
}
新增类
public abstract class AppBarStateChangeListener implements AppBarLayout.OnOffsetChangedListener {
public enum State {
EXPANDED,
COLLAPSED,
IDLE
}
private State mCurrentState = State.IDLE;
@Override
public final void onOffsetChanged(AppBarLayout appBarLayout, int i) {
if (i == 0) {
if (mCurrentState != State.EXPANDED) {
onStateChanged(appBarLayout, State.EXPANDED);
}
mCurrentState = State.EXPANDED;
} else if (Math.abs(i) >= appBarLayout.getTotalScrollRange()) {
if (mCurrentState != State.COLLAPSED) {
onStateChanged(appBarLayout, State.COLLAPSED);
}
mCurrentState = State.COLLAPSED;
} else {
if (mCurrentState != State.IDLE) {
onStateChanged(appBarLayout, State.IDLE);
}
mCurrentState = State.IDLE;
}
}
public abstract void onStateChanged(AppBarLayout appBarLayout, State state);
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context="com.sloop.tabdemo.MainActivity">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#fff"
android:fitsSystemWindows="true"
app:elevation="0dp">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:collapsedTitleTextAppearance="@style/collapsedStyle"
app:expandedTitleTextAppearance="@style/expandedStyle"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll">
<ImageView
android:id="@+id/iv"
android:layout_width="match_parent"
android:layout_height="280dp"
android:scaleType="fitXY"
android:src="@drawable/img" />
</RelativeLayout>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
app:layout_collapseMode="pin">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:tabIndicatorHeight="3dp"
app:tabSelectedTextColor="#f00"
app:tabTextColor="#000" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#25979797" />
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:overScrollMode="never" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
</LinearLayout>
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