AnimateLayoutChanges, RecyclerView

Question

ile çalışmaz Geri Dönüşüm ekranı ve LinearLayout öğesinin içindeki diğer Öğeleri olan bir ekranım var. Sorun, RecyclerView öğesinin bir öğesini kaldırdığımda, animateLayoutChanges bu durumda çalışmaz. Anayone bunun neden olduğunu biliyor mu?

XML Bir süre sonra

<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" 
tools:context="com.example.alvaro.resizetest.MainActivity"> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:animateLayoutChanges="true" 
    android:orientation="vertical"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/recyclerview" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> 

    <LinearLayout 
     android:id="@+id/test1" 
     android:layout_width="match_parent" 
     android:layout_height="50dp" 
     android:background="@color/colorAccent" 
     android:gravity="center_vertical"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="LinearLayout" 
      android:textColor="#FFFFFF" 
      android:textSize="22sp"/> 
    </LinearLayout> 


    <LinearLayout 
     android:id="@+id/test2" 
     android:layout_width="match_parent" 
     android:layout_height="50dp" 
     android:background="@color/colorPrimaryDark" 
     android:gravity="center_vertical"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="LinearLayout" 
      android:textColor="#FFFFFF" 
      android:textSize="22sp"/> 
    </LinearLayout> 


    <LinearLayout 
     android:id="@+id/test3" 
     android:layout_width="match_parent" 
     android:layout_height="50dp" 
     android:background="@color/colorAccent" 
     android:gravity="center_vertical"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="LinearLayout" 
      android:textColor="#FFFFFF" 
      android:textSize="22sp"/> 
    </LinearLayout> 


    <LinearLayout 
     android:id="@+id/test4" 
     android:layout_width="match_parent" 
     android:layout_height="50dp" 
     android:background="@color/colorPrimaryDark" 
     android:gravity="center_vertical"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="LinearLayout" 
      android:textColor="#FFFFFF" 
      android:textSize="22sp"/> 
    </LinearLayout> 


</LinearLayout> 

JAVA

public class MainActivity extends AppCompatActivity { 

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

    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview); 

    Adapter adapter = new Adapter(); 

    recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
    recyclerView.setAdapter(adapter); 
    recyclerView.setNestedScrollingEnabled(true); 

    View.OnClickListener listener = new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      view.setVisibility(View.GONE); 
     } 
    }; 

    findViewById(R.id.test1).setOnClickListener(listener); 
    findViewById(R.id.test2).setOnClickListener(listener); 
    findViewById(R.id.test3).setOnClickListener(listener); 
    findViewById(R.id.test4).setOnClickListener(listener); 

} 


class Adapter extends RecyclerView.Adapter<Adapter.Holder>{ 

    int size = 3; 

    public Adapter() { 
    } 

    @Override 
    public Holder onCreateViewHolder(ViewGroup parent, int viewType) { 

     View view = getLayoutInflater().inflate(R.layout.item, parent, false); 

     return new Holder(view); 
    } 

    @Override 
    public void onBindViewHolder(Holder holder, int position) { 

    } 

    @Override 
    public int getItemCount() { 
     return size; 
    } 

    class Holder extends RecyclerView.ViewHolder { 

     public Holder(final View itemView) { 
      super(itemView); 

      itemView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        size --; 
        notifyItemRemoved(getAdapterPosition()); 
       } 
      }); 

     } 
    } 
} 

Answer 1

Aklıma bir fikir geldi. RecyclerView yüksekliğini canlandıracak bir işlev yaptım.

JAVA

public class MainActivity extends AppCompatActivity { 

private final String TAG = MainActivity.class.getSimpleName(); 

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

    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview); 

    Adapter adapter = new Adapter(recyclerView); 

    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this) { 
     @Override 
     public boolean canScrollVertically() { 
      return false; 
     } 
    }; 

    recyclerView.setLayoutManager(linearLayoutManager); 
    recyclerView.setAdapter(adapter); 
    recyclerView.setNestedScrollingEnabled(true); 

    View.OnClickListener listener = new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      view.setVisibility(View.GONE); 
     } 
    }; 

    findViewById(R.id.test1).setOnClickListener(listener); 
    findViewById(R.id.test2).setOnClickListener(listener); 
    findViewById(R.id.test3).setOnClickListener(listener); 
    findViewById(R.id.test4).setOnClickListener(listener); 

} 


public void animateHeight(final View v, final int height) { 

    final int initialHeight = v.getMeasuredHeight(); 
    int duration = 500; 
    Interpolator interpolator = new AccelerateInterpolator(2); 

    // I have to set the same height before the animation because there is a glitch 
    // in the beginning of the animation 
    v.getLayoutParams().height = initialHeight; 
    v.requestLayout(); 

    Animation a = new Animation() { 
     @Override 
     protected void applyTransformation(float interpolatedTime, Transformation t) { 
      Log.d(TAG, "InterpolatedTime: " + interpolatedTime); 
      Log.d(TAG, "Collapsing height: " + (initialHeight - (int) (height * interpolatedTime))); 
      v.getLayoutParams().height = initialHeight - (int) (height * interpolatedTime); 
      v.requestLayout(); 
     } 

     @Override 
     public boolean willChangeBounds() { 
      return true; 
     } 
    }; 

    a.setDuration(duration); 
    a.setInterpolator(interpolator); 
    v.startAnimation(a); 
} 


class Adapter extends RecyclerView.Adapter<Adapter.Holder> { 

    RecyclerView mRecyclerView; 
    int size = 3; 

    public Adapter(RecyclerView recyclerView) { 
     mRecyclerView = recyclerView; 
    } 

    @Override 
    public Holder onCreateViewHolder(ViewGroup parent, int viewType) { 

     View view = getLayoutInflater().inflate(R.layout.item, parent, false); 

     return new Holder(view); 
    } 

    @Override 
    public void onBindViewHolder(Holder holder, int position) { 

    } 

    @Override 
    public int getItemCount() { 
     return size; 
    } 

    class Holder extends RecyclerView.ViewHolder { 

     public Holder(final View itemView) { 
      super(itemView); 

      itemView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        size--; 
        notifyItemRemoved(getAdapterPosition()); 
        animateHeight((View) itemView.getParent(), itemView.getMeasuredHeight()); 
       } 
      }); 

     } 
    } 
} 

} benim için çalıştı Ne

Answer 2

basitçe onCreate için aşağıdaki kodu ekleyerek edildi:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 
    ((ViewGroup) findViewById(R.id.llRoot)).getLayoutTransition() 
     .enableTransitionType(LayoutTransition.CHANGING); 
} 

llRoot sen nerede r LineearLayout içeren RecyclerView.

LinearLayout'unuzda android:animateLayoutChanges="true"'u tutmanız gerekir, aksi halde kilitlenir.

Bu JellyBean'ı desteklemek istiyorsanız, özel çözümünüze ihtiyacınız olacaktır.

Buradaki çözüm hakkında açıklama: https://proandroiddev.com/the-little-secret-of-android-animatelayoutchanges-e4caab2fddec