大佬教程收集整理的这篇文章主要介绍了查看Android中的动画折叠/展开LinearLayout中的视图，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我想实现
主要活动
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),layout.getChildAt(0).getHeight()); expandOrCollapse(layout.getChildAt(0),0); } }); btn_collapse.setOnClickListener(new View.onClickListener() { @Override public void onClick(View v) { expandOrCollapse(layout.getChildAt(0),false,0); expandOrCollapse(layout.getChildAt(1),layout.getChildAt(0).getHeight()); expandOrCollapse(layout.getChildAt(2),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,-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://scheR_608_11845@as.android.com/apk/res/android" xmlns:tools="http://scheR_608_11845@as.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>
当我第一次单击“扩展”按钮时,第二次不显示动画.
启用可见项目后,单击折叠按钮.
接下来做什么 ：
当我选择任何View项目时,它必须显示选择的动画,然后折叠动画,崩溃后,它必须显示为顶部视图像我在图像上面提到.目前,我很难编辑视图的数量,并为每个视图写入了动态静态高度的静态动画,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 ,但他们无法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器视图还是什么？
为了节省时间,我已经将我的样品添加到git hub,您可以尝试它Animation Sample Github
请推荐我
public class DropDownAnim extends Animation { private final int targetHeight; private final View view; private final Boolean down; public DropDownAnim(View view,int targetHeight,Boolean down) { this.view = view; this.targetHeight = targetHeight; this.down = down; } @Override protected void applyTransformation(float interpolatedTime,Transformation t) { int newHeight; if (down) { newHeight = (int) (targetHeight * interpolatedTimE); } else { newHeight = 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; } }
在使用这个.为了扩展
public void expand(final View v) { 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); }
为了崩溃：
public void collapse(final View v) { final int targetHeight = v.getMeasuredHeight(); DropDownAnim a = new DropDownAnim(v,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); }
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