Utilizzo di un coordinatorlayout per comprimere un'immagine a schermo intero e sostituirla con viewpager con intestazioni

Question

Ho iniziato a giocare con coordinatoralyout e sto cercando di ottenere il comportamento sull'immagine allegata, voglio che l'immagine di sfondo sia a schermo intero e su una pergamena voglio che alcune visioni del testo scompaiano e alcune restino come parti di un viewpager (piuttosto che di una barra degli strumenti) qualsiasi indicazione su come posso ottenere questo?

Answer 1

È possibile utilizzare layout_behavior per gestire le stringhe che si desidera vengano eliminate durante lo scorrimento. Personalizza il tuo comportamento vista utilizzando CoordinatorLayout.Behavior

ViewBehavior.java

public class ViewBehavior extends CoordinatorLayout.Behavior<RelativeLayout> { 

private Context mContext; 

public ViewBehavior(Context context, AttributeSet attrs) { 
    mContext = context; 
} 

@Override 
public boolean layoutDependsOn(CoordinatorLayout parent, RelativeLayout child, View dependency) { 
    return dependency instanceof AppBarLayout; 
} 

@Override 
public boolean onDependentViewChanged(CoordinatorLayout parent, RelativeLayout child, View dependency) { 
    child.measure(View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.AT_MOST)); 
    int maxScroll = ((AppBarLayout) dependency).getTotalScrollRange(); 
    float percentage = Math.abs(dependency.getY())/(float) maxScroll; 
    float childPosition = dependency.getHeight() 
      + dependency.getY() 
      - child.getMeasuredHeight() 
      - (getToolbarHeight() - child.getMeasuredHeight()) * percentage/2; 

    CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 
    child.setLayoutParams(lp); 

    child.setY(childPosition); 
    return true; 
} 

public int getToolbarHeight() { 
    int result = 0; 
    TypedValue tv = new TypedValue(); 
    if (mContext.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) { 
     result = TypedValue.complexToDimensionPixelSize(tv.data, mContext.getResources().getDisplayMetrics()); 
    } 
    return result; 
} 
} 

Nel file XML di layout, impostare il vostro comportamento visualizzazione personalizzata come un app : layout_behavior nella vista che si desidera gestire.

activity_main.xml

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:id="@+id/coordinator_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true"> 

<android.support.design.widget.AppBarLayout 
    android:id="@+id/app_bar_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:fitsSystemWindows="true" 
     app:contentScrim="?attr/colorPrimary" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed"> 

     <ImageView 
      android:id="@+id/image" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:fitsSystemWindows="true" 
      app:layout_collapseMode="parallax" /> 

    </android.support.design.widget.CollapsingToolbarLayout> 

</android.support.design.widget.AppBarLayout> 

<android.support.v4.widget.NestedScrollView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fillViewport="true" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

    <LinearLayout 
     android:id="@+id/llViewPager" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical"> 

     <com.astuetz.PagerSlidingTabStrip 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="48dp" 
      android:textColor="@color/red" 
      app:pstsShouldExpand="true" 
      app:pstsTextAllCaps="true" /> 

     <android.support.v4.view.ViewPager 
      android:id="@+id/viewpager" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@android:color/white" /> 
    </LinearLayout> 
</android.support.v4.widget.NestedScrollView> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="com.stacktest.ViewBehavior"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_marginBottom="20dp" 
     android:layout_marginLeft="36dp" 
     android:layout_marginTop="20dp" 
     android:text="Text-1" /> 

    <TextView 
     android:id="@+id/txt2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentRight="true" 
     android:layout_marginBottom="20dp" 
     android:layout_marginRight="36dp" 
     android:layout_marginTop="20dp" 
     android:text="Text-2" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_below="@id/txt2" 
     android:layout_marginBottom="20dp" 
     android:layout_marginLeft="36dp" 
     android:paddingRight="20dp" 
     android:text="Text-3" /> 

    <TextView 
     android:id="@+id/txt4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentRight="true" 
     android:layout_below="@id/txt2" 
     android:layout_marginBottom="20dp" 
     android:layout_marginRight="36dp" 
     android:text="Text-4" /> 
</RelativeLayout> 
</android.support.design.widget.CoordinatorLayout> 

Infine, utilizzare il layout e creare ViewPager e le schede nella tua classe di attività.

MainActivity.java

public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    ((CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar)).setTitle(" "); 

    ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager); 
    viewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager())); 

    PagerSlidingTabStrip tabsStrip = (PagerSlidingTabStrip) findViewById(R.id.tabs); 
    tabsStrip.setViewPager(viewPager); 
} 

public class MyPagerAdapter extends FragmentPagerAdapter { 
    final int PAGE_COUNT = 2; 
    private String tabTitles[] = new String[] { "Tab1", "Tab2" }; 

    public MyPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public int getCount() { 
     return PAGE_COUNT; 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return TestFragment.newInstance(position + 1); 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return tabTitles[position]; 
    } 
} 
} 

Add seguente dipendenza in più in build.gradle con appcompat e libreria di supporto.

• com.android.support:design:23.2.1
• com.astuetz: pagerslidingtabstrip: 1.0.1 (per le schede ViewPager)

Answer 2

Come io non sono sicuro se si desidera un particolare o di una soluzione generale, ho intenzione di darvi la mia soluzione per la vostra domanda particolare. La chiave è lavorare con scrollFlags e collapseMode. Se si in realtà si desidera nascondere le schede quando la barra delle applicazioni è espansa, è possibile giocare con la visibilità.

<?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:id="@+id/main_content" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appBar" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 
    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     app:contentScrim="?attr/colorPrimary" 
     app:layout_scrollFlags="scroll|enterAlways|snap"> 

     <RelativeLayout 
      android:layout_marginTop="?attr/actionBarSize" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 

      <ImageView 
       android:id="@+id/image" 
       android:layout_width="match_parent" 
       android:layout_height="375dp" 
       android:src="@drawable/ic_launcher"/> 

      <LinearLayout 
       android:layout_marginBottom="30dp" 
       android:layout_below="@+id/image" 
       android:layout_width="match_parent" 
       android:orientation="horizontal" 
       android:layout_height="wrap_content"> 

       <TextView 
        android:layout_marginLeft="30dp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="20sp" 
        android:text="textView1"/> 

       <TextView 
        android:layout_marginLeft="140dp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="20sp" 
        android:text="textView2"/> 

      </LinearLayout> 

     </RelativeLayout> 


     <android.support.v7.widget.Toolbar 
      android:id="@+id/mToolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_collapseMode="pin"/> 

    </android.support.design.widget.CollapsingToolbarLayout> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:orientation="horizontal" 
     android:layout_height="wrap_content"> 

     <TextView 
      android:layout_marginLeft="30dp" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="20sp" 
      android:text="textView3"/> 

     <TextView 
      android:layout_marginLeft="140dp" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="20sp" 
      android:text="textView4"/> 

    </LinearLayout> 

    <android.support.design.widget.TabLayout 
     android:id="@+id/tabLayout" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:layout_gravity="bottom" 
     android:background="?attr/colorPrimary" 
     app:tabMode="scrollable"/> 
</android.support.design.widget.AppBarLayout> 

<android.support.v4.view.ViewPager 
    android:id="@+id/tab_viewpager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

Answer 3

http://d-codepages.com/collapsing-toolbar-android-example/

questo link dovrebbe aiutare. Puoi giocare con questo progetto di esempio.