Come creare schede della barra degli strumenti con ViewPager nella progettazione del materiale

Question

Qualcuno sa qualcosa su come le schede vengono eseguite nella barra degli strumenti API 21/AppCompat?

Un sacco di materiali e articoli che ho trovato erano vecchi. Hanno usato vecchi metodi con ActionBar che non funzionano ora. In questo momento ho appena creato la barra degli strumenti e non ho idee sulle schede della barra degli strumenti. Quindi qualcuno può dare esempi o articoli su come creare schede delle barre degli strumenti con viewpager?

Answer 1

Qualcuno sa qualcosa su come le schede sono fatte in API 21/AppCompat Toolbar?

Non ci sono schede Toolbar. Il modello di avere schede nella barra delle azioni era deprecato da Material Design e, quando creavano Toolbar, lasciavano le schede.

Così chiunque può fornire esempi o articoli su come creare schede della barra degli strumenti con viewpager.

Non ci sono schede Toolbar.

Siete invitati a utilizzare PagerTabStrip, il TabPageIndicator da the ViewPagerIndicator library, PagerSlidingTabStrip, ecc per i vostri ViewPager schede.

Answer 2

1. Copia SlidingTabLayout.java da https://developer.android.com/samples/SlidingTabsColors/src/com.example.android.common/view/SlidingTabLayout.html e incollalo nella confezione.

MainActivity.java

public class MainActivity extends ActionBarActivity { 

static final String LOG_TAG = "SlidingTabsBasicFragment"; 
private SlidingTabLayout mSlidingTabLayout; 
private ViewPager mViewPager; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.fragment_sample); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar); 

    mViewPager = (ViewPager) findViewById(R.id.viewpager); 
    mViewPager.setAdapter(new SamplePagerAdapter()); 
    mSlidingTabLayout = (SlidingTabLayout) findViewById(R.id.sliding_tabs); 
    mSlidingTabLayout.setViewPager(mViewPager); 

    /* 
    * FragmentTransaction transaction = 
    * getSupportFragmentManager().beginTransaction(); 
    * SlidingTabsBasicFragment fragment = new SlidingTabsBasicFragment(); 
    * transaction.replace(R.id.sample_content_fragment, fragment); 
    * transaction.commit(); 
    */ 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

class SamplePagerAdapter extends PagerAdapter { 

    /** 
    * @return the number of pages to display 
    */ 
    @Override 
    public int getCount() { 
     return 5; 
    } 

    /** 
    * @return true if the value returned from 
    *   {@link #instantiateItem(ViewGroup, int)} is the same object 
    *   as the {@link View} added to the {@link ViewPager}. 
    */ 
    @Override 
    public boolean isViewFromObject(View view, Object o) { 
     return o == view; 
    } 

    // BEGIN_INCLUDE (pageradapter_getpagetitle) 
    /** 
    * Return the title of the item at {@code position}. This is important 
    * as what this method returns is what is displayed in the 
    * {@link SlidingTabLayout}. 
    * <p> 
    * Here we construct one using the position value, but for real 
    * application the title should refer to the item's contents. 
    */ 
    @Override 
    public CharSequence getPageTitle(int position) { 
     return "Item " + (position + 1); 
    } 

    // END_INCLUDE (pageradapter_getpagetitle) 

    /** 
    * Instantiate the {@link View} which should be displayed at 
    * {@code position}. Here we inflate a layout from the apps resources 
    * and then change the text view to signify the position. 
    */ 
    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     // Inflate a new layout from our resources 

     View view = getLayoutInflater().inflate(R.layout.pager_item, 
       container, false); 
     // Add the newly created View to the ViewPager 
     container.addView(view); 

     // Retrieve a TextView from the inflated View, and update it's text 
     TextView title = (TextView) view.findViewById(R.id.item_title); 
     title.setText(String.valueOf(position + 1)); 

     Log.i(LOG_TAG, "instantiateItem() [position: " + position + "]"); 

     // Return the View 
     return view; 
    } 

    /** 
    * Destroy the item from the {@link ViewPager}. In our case this is 
    * simply removing the {@link View}. 
    */ 
    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
     container.removeView((View) object); 
     Log.i(LOG_TAG, "destroyItem() [position: " + position + "]"); 
    } 

} 

}

fragment_sample.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <android.support.v7.widget.Toolbar 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     android:id="@+id/my_awesome_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:minHeight="?attr/actionBarSize" 

     app:theme="@style/ThemeOverlay.AppCompat.ActionBar"> 

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

      <com.example.android.common.view.SlidingTabLayout 
       android:id="@+id/sliding_tabs" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" /> 
     </LinearLayout> 
    </android.support.v7.widget.Toolbar> 

    <android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="0px" 
     android:layout_weight="1" 
     android:background="@android:color/white" /> 

</LinearLayout> 

Pager_item.xml

<?xml version="1.0" encoding="utf-8"?> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     android:gravity="center"> 

    <TextView 
      android:id="@+id/item_subtitle" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="Page:"/> 

    <TextView 
      android:id="@+id/item_title" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="80sp" /> 

</LinearLayout> 

Answer 3

ho creato una libreria che potrebbe aiutare con questo layout , ma non ho usato Toolbar (l'ho creato con RelativeLayout).

Ho appena creato una vista personalizzata che estende RelativeLayout e al suo interno ho inserito tutti gli elementi (LinearLayout per la barra degli strumenti, Vista per l'indicatore e un ViewPager).

Ecco la classe CustomView:

public class ToolbarPagerView extends RelativeLayout { 

private static final @IdRes int MENU_ID = 0x0042; 
private static final @IdRes int PAGER_ID = 0x0666; 

private int totalPages; 
private int currentPage; 
private @ColorInt int toolbarColor; 
private @ColorInt int itemColor; 
private ToolbarPagerAdapter toolbarPagerAdapter; 
private LinearLayout menu; 
private ViewPager viewPager; 
private View marker; 

public ToolbarPagerView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    initialize(context, attrs); 
} 

public ToolbarPagerView(Context context, AttributeSet attrs, int defStyleAttr) { 
    this(context, attrs, defStyleAttr, 0); 
    initialize(context, attrs); 
} 

@TargetApi(Build.VERSION_CODES.LOLLIPOP) 
public ToolbarPagerView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 
    super(context, attrs, defStyleAttr, defStyleRes); 
    initialize(context, attrs); 
} 

private void initialize(Context context, AttributeSet attrs) { 
    /* RETRIEVE MAX PAGES */ 
    TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.ToolbarPagerView); 
    try { 
     toolbarColor = attributes.getInteger(R.styleable.ToolbarPagerView_toolbar_color, R.color.color_primary_dark); 
     itemColor = attributes.getInteger(R.styleable.ToolbarPagerView_item_color, R.color.color_accent); 
    } finally { 
     attributes.recycle(); 
     setViews(context); 
    } 
} 

private void setViews(Context context) { 
    /* MENU */ 
    menu = new LinearLayout(context); 
    menu.setId(MENU_ID); 
    menu.setOrientation(LinearLayout.HORIZONTAL); 
    menu.setBackgroundColor(toolbarColor); 
    menu.setGravity(Gravity.CENTER); 

    addView(menu); 

    LayoutParams menuParams = (LayoutParams) menu.getLayoutParams(); 

    TypedArray toolbarAttributes = context.getTheme().obtainStyledAttributes(new int[] { android.R.attr.actionBarSize }); 
    menuParams.width = ViewGroup.LayoutParams.MATCH_PARENT; 
    menuParams.height = (int) toolbarAttributes.getDimension(0, 0); 

    /* PAGES */ 
    viewPager = new ViewPager(context); 
    viewPager.setId(PAGER_ID); 

    addView(viewPager); 

    LayoutParams pagerParams = (LayoutParams) viewPager.getLayoutParams(); 
    pagerParams.width = ViewGroup.LayoutParams.MATCH_PARENT; 
    pagerParams.height = ViewGroup.LayoutParams.MATCH_PARENT; 
    pagerParams.addRule(BELOW, MENU_ID); 

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { 
     @Override 
     public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
      marker.setX((positionOffsetPixels/totalPages) + (marker.getMeasuredWidth() * position)); 
     } 

     @Override 
     public void onPageSelected(int position) { 
      currentPage = position; 
     } 

     @Override 
     public void onPageScrollStateChanged(int state) { 

     } 
    }); 

    /* SHADOW */ 
    View shadow = new View(context); 
    shadow.setBackgroundResource(R.drawable.shadow); 

    addView(shadow); 

    LayoutParams shadowParams = (LayoutParams) shadow.getLayoutParams(); 

    shadowParams.width = ViewGroup.LayoutParams.MATCH_PARENT; 
    shadowParams.height = (int) context.getResources().getDimension(R.dimen.shadow_height); 

    shadowParams.addRule(BELOW, MENU_ID); 

    /* MARKER */ 
    marker = new View(context); 
    marker.setBackgroundColor(itemColor); 

    addView(marker); 

    LayoutParams markerParams = (LayoutParams) marker.getLayoutParams(); 
    markerParams.height = (int) context.getResources().getDimension(R.dimen.marker_height); 
    markerParams.addRule(ALIGN_BOTTOM, MENU_ID); 

    getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
     @Override 
     public void onGlobalLayout() { 
      if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) { 
       getViewTreeObserver().removeGlobalOnLayoutListener(this); 
      } else { 
       getViewTreeObserver().removeOnGlobalLayoutListener(this); 
      } 

      LayoutParams markerParams = (LayoutParams) marker.getLayoutParams(); 
      markerParams.width = menu.getMeasuredWidth()/totalPages; 
      marker.setX(currentPage * markerParams.width); 
     } 
    }); 
} 

public void setAdapter(FragmentManager fragmentManager) { 
    toolbarPagerAdapter = new ToolbarPagerAdapter(fragmentManager); 
    viewPager.setAdapter(toolbarPagerAdapter); 
} 

public void addPage(Fragment fragment) { 
    addPage(R.mipmap.ic_star, fragment); 
} 

public void addPage(@DrawableRes int icon, Fragment fragment) { 
    ImageView item = new ImageView(getContext()); 

    item.setImageResource(icon); 
    item.setTag(totalPages); 
    item.setColorFilter(itemColor); 

    TypedArray selectAttributes = getContext().obtainStyledAttributes(new int[]{android.R.attr.selectableItemBackground}); 

    if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) { 
     item.setBackgroundDrawable(selectAttributes.getDrawable(0)); 
    } else { 
     item.setBackground(selectAttributes.getDrawable(0)); 
    } 

    menu.setWeightSum(++totalPages); 
    menu.addView(item); 

    item.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Integer itemPosition = (Integer) v.getTag(); 
      viewPager.setCurrentItem(itemPosition); 
     } 
    }); 

    LinearLayout.LayoutParams itemParams = (LinearLayout.LayoutParams) item.getLayoutParams(); 

    itemParams.width = ViewGroup.LayoutParams.MATCH_PARENT; 
    itemParams.height = ViewGroup.LayoutParams.MATCH_PARENT; 
    itemParams.weight = 1; 

    toolbarPagerAdapter.addPage(fragment); 
} 
} 

Ed ecco la classe CustomAdapter:

public class ToolbarPagerAdapter extends FragmentPagerAdapter { 

private static final String PAGE_DUPLICATED_MESSAGE = "You're trying to add a duplicated page, are you doublethinking? - Orwell, George/Index: "; 

private ArrayList<Fragment> pages; 

public ToolbarPagerAdapter(FragmentManager fm) { 
    super(fm); 
    pages = new ArrayList<>(); 
} 

public void addPage(Fragment fragment) { 
    pages.add(fragment); 
    notifyDataSetChanged(); 
} 

@Override 
public Fragment getItem(int position) { 
    return pages.get(position); 
} 

@Override 
public int getCount() { 
    return pages.size(); 
} 
} 

e si può trovare qui un progetto demo che ho creato sulla base di questa soluzione:

https://github.com/PedroOkawa/toolbar-pager-view

Dai un'occhiata al codice se sei vuoi, spero ti possa aiutare.