高さを変更する方法をアニメーション化するには

Question

私のアプリにはシンプルなカードがあり、ユーザーがそれをクリックすると高さが変わります。この高さの変化は私がアニメーション化したい、高さの滑らかな変化。

@OnClick({R.id.emptyDescription}) 
public void onClick(View view) { 
    switch (view.getId()) { 
     case R.id.emptyDescription: 
      if(isCardCollapsed){ 

       emptyDescription.setMinimumHeight(400); 

       cancelSaveLinear.setVisibility(View.VISIBLE); 
       editDescription.setVisibility(View.GONE); 

       isCardCollapsed = false; 
      } else { 
       emptyDescription.setMinimumHeight(100); 

       cancelSaveLinear.setVisibility(View.GONE); 
       editDescription.setVisibility(View.VISIBLE); 

       isCardCollapsed = true; 
      } 

      break; 
     case R.id.card_view: 
      break; 
    } 
} 

どうすればいいですか？

Answer 1

解決済み：

public class MainActivity extends AppCompatActivity { 

    private CardView cardView; 
    private Boolean isCollapsed = true; 

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

     cardView = (CardView) findViewById(R.id.card_view); 

     final int originalDimension = Math.round(getResources().getDimension(R.dimen.original_card_view_height)); 
     final int newDimension = Math.round(getResources().getDimension(R.dimen.new_card_view_height)); 

     cardView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if(isCollapsed){ 
        TransitionManager.beginDelayedTransition(cardView, new TransitionSet() 
          .addTransition(new ChangeBounds())); 

        ViewGroup.LayoutParams params = cardView.getLayoutParams(); 
        params.height = newDimension; 
        cardView.setLayoutParams(params); 

        isCollapsed = false; 
       } else { 
        TransitionManager.beginDelayedTransition(cardView, new TransitionSet() 
          .addTransition(new ChangeBounds())); 

        ViewGroup.LayoutParams params = cardView.getLayoutParams(); 
        params.height = originalDimension; 
        cardView.setLayoutParams(params); 

        isCollapsed = true; 
       } 
      } 
     }); 
    } 
} 

Answer 2

新しいサイズを適用するときに、サンプルコードのこのdeveloper.android.com/training/animation/layout.htmlをチェックアウト

TransitionManager.beginDelayedTransition(transitionsContainer, new TransitionSet() 
    .addTransition(new ChangeBounds()) 
    .addTransition(new ChangeImageTransform())); 

ViewGroup.LayoutParams params = imageView.getLayoutParams(); 
params.height = expanded ? ViewGroup.LayoutParams.MATCH_PARENT : 
    ViewGroup.LayoutParams.WRAP_CONTENT; 
imageView.setLayoutParams(params); 

imageView.setScaleType(expanded ? ImageView.ScaleType.CENTER_CROP : 
    ImageView.ScaleType.FIT_CENTER); 

ソース https://medium.com/@andkulikov/animate-all-the-things-transitions-in-android-914af5477d50

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