查看动画在Android的折叠/展开视图中的LinearLayout

Question

我添加图片动态查看我的线性布局，

我想实现

下面是示例代码，我做了什么

MainActivity

package ksp.com.animationssample; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.animation.AccelerateInterpolator; 
import android.view.animation.Animation; 
import android.view.animation.TranslateAnimation; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 

public class MainActivity extends AppCompatActivity { 

    private Button btn_expand; 
    private Button btn_collapse; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     btn_expand = (Button) findViewById(R.id.btn_expand); 
     btn_collapse = (Button) findViewById(R.id.btn_collapse); 
     LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
     final LinearLayout layout = (LinearLayout) findViewById(R.id.imageLayout); 


     for (int i = 0; i < 3; i++) { 
      final ImageView image = new ImageView(MainActivity.this); 
      image.setLayoutParams(vp); 
      if (i == 0) 
       image.setImageDrawable(getResources().getDrawable(R.drawable.item_image1)); 
      else image.setImageDrawable(getResources().getDrawable(R.drawable.item_image2)); 
      if (i == 2) 
       image.setVisibility(View.VISIBLE); 
      else 
       image.setVisibility(View.GONE); 
      layout.addView(image); 
     } 


     btn_expand.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       expandOrCollapse(layout.getChildAt(2), true, layout.getChildAt(0).getHeight() + layout.getChildAt(1).getHeight()); 
       expandOrCollapse(layout.getChildAt(1), true, layout.getChildAt(0).getHeight()); 
       expandOrCollapse(layout.getChildAt(0), true, 0); 


      } 
     }); 
     btn_collapse.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       expandOrCollapse(layout.getChildAt(0), false, 0); 
       expandOrCollapse(layout.getChildAt(1), false, layout.getChildAt(0).getHeight()); 
       expandOrCollapse(layout.getChildAt(2), false, layout.getChildAt(0).getHeight() + layout.getChildAt(1).getHeight()); 
      } 
     }); 


    } 


    public void expandOrCollapse(final View v, boolean is_expand, final int animheight) { 
     TranslateAnimation anim = null; 
     if (is_expand) { 
      anim = new TranslateAnimation(0.0f, 0.0f, -animheight, 0.0f); 
      v.setVisibility(View.VISIBLE); 
      Animation.AnimationListener expandedlistener = new Animation.AnimationListener() { 
       @Override 
       public void onAnimationStart(Animation animation) { 
       } 

       @Override 
       public void onAnimationRepeat(Animation animation) { 
       } 

       @Override 
       public void onAnimationEnd(Animation animation) { 


       } 
      }; 

      anim.setAnimationListener(expandedlistener); 
     } else { 
      anim = new TranslateAnimation(0.0f, 0.0f, 0.0f, -animheight); 
      Animation.AnimationListener collapselistener = new Animation.AnimationListener() { 
       @Override 
       public void onAnimationStart(Animation animation) { 
       } 

       @Override 
       public void onAnimationRepeat(Animation animation) { 
       } 

       @Override 
       public void onAnimationEnd(Animation animation) { 
        v.setVisibility(View.GONE); 
       } 
      }; 

      anim.setAnimationListener(collapselistener); 
     } 

     anim.setDuration(1500); 
     anim.setInterpolator(new AccelerateInterpolator(0.5f)); 
     v.startAnimation(anim); 
    } 
} 

activity_mainn.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:orientation="vertical" 
    android:background="@android:color/holo_blue_dark" 
    tools:context="ksp.com.animationssample.MainActivity"> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:id="@+id/btn_expand" 
     android:text="Expand" 
     /> 
    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/btn_collapse" 
     android:text="Collopse"/> 
<ScrollView 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:scrollbars="vertical"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:id="@+id/imageLayout" 
     android:gravity="center" 

     android:orientation="vertical" 
     android:layout_height="wrap_content"> 
    </LinearLayout> 
    <!--android:animateLayoutChanges="true"--> 
</ScrollView> 


</RelativeLayout> 

当我点击在第一时间展开按钮没有显示从它的工作，第二次的动画。

启用可见项后点击崩溃按钮。

下一步做什么： 当我选择它来显示选择动画，然后合拢动画播放，倒塌后它就像我在图片上面提到显示为顶视图中的任何视图项目。目前我硬编码的意见，并为每个视图静态动画编写静态动画，即（expandOrCollapse(view, height_of_view)）

我搜索了一段时间，但没有运气。

我遵循Vie expand/collapse和smooth expand/collapse，但他们不能帮助我扩展线性布局中的所有视图。

我们可以做这个列表视图是回收视图还是什么？

为节省时间我已经加入我的样品git的枢纽，你可以尝试一下Animation Sample Github

建议我请。

Answer 1

尽量不要隐藏你的目标视图（现在你设置可见走了倒塌的动画结束后，所有的意见），并做到这一点：

targetView.bringToFront(); 
targetView.invalidate(); 
targetView.getParent().requestLayout(); 

Answer 2

我已经单独的类吧。检查它是否适用于您：

public class DropDownAnim extends Animation { 
    private final int sourceHeight; 
    private final int targetHeight; 
    private final View view; 
    private final boolean down; 

    public DropDownAnim(View view, int sourceHeight, int targetHeight, boolean down) { 
     this.view = view; 
     this.sourceHeight = sourceHeight; 
     this.targetHeight = targetHeight; 
     this.down = down; 
    } 

    @Override 
    protected void applyTransformation(float interpolatedTime, Transformation t) { 
     int newHeight; 
     if (down) { 
      newHeight = sourceHeight + (int) (targetHeight * interpolatedTime); 
     } else { 
      newHeight = sourceHeight + targetHeight - (int) (targetHeight * interpolatedTime);//(int) (targetHeight * (1 - interpolatedTime)); 
     } 
     view.getLayoutParams().height = newHeight; 
     view.requestLayout(); 
     view.setVisibility(down ? View.VISIBLE : View.GONE); 
    } 

    @Override 
    public void initialize(int width, int height, int parentWidth, 
      int parentHeight) { 
     super.initialize(width, height, parentWidth, parentHeight); 
    } 

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

虽然与此工作。为了扩大

public void expand(final View v) { 
     final int sourceHeight = v.getLayoutParams().height; 
     final int targetHeight = getResources().getDimensionPixelSize(R.dimen.notification_height);//v.getMeasuredHeight(); 
     DropDownAnim a = new DropDownAnim(v,targetHeight,true); 
     a.setDuration((int) (targetHeight/v.getContext().getResources().getDisplayMetrics().density)); 
     a.setAnimationListener(new Animation.AnimationListener() { 
      @Override 
      public void onAnimationStart(Animation animation) { 

      } 

      @Override 
      public void onAnimationEnd(Animation animation) { 
       // Your code on end of animation 
      } 

      @Override 
      public void onAnimationRepeat(Animation animation) { 

      } 
     }); 
     v.setVisibility(View.INVISIBLE); 
     v.startAnimation(a); 
    } 

对于崩溃：

public void collapse(final View v) { 
     final int sourceHeight = v.getLayoutParams().height; 
     final int targetHeight = v.getMeasuredHeight(); 
     DropDownAnim a = new DropDownAnim(v, targetHeight, false); 
     a.setDuration((int) (targetHeight/v.getContext().getResources().getDisplayMetrics().density)); 
     a.setAnimationListener(new Animation.AnimationListener() { 
      @Override 
      public void onAnimationStart(Animation animation) { 

      } 

      @Override 
      public void onAnimationEnd(Animation animation) { 
       // Your code on end of animation 
      } 

      @Override 
      public void onAnimationRepeat(Animation animation) { 

      } 
     }); 
     v.startAnimation(a); 
    } 

更新：
sourceHeight加入防止视图闪烁。