我将图像动态添加到我的线性布局,
我想实现
这是我做了什么样的示例代码
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://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
解决方法
我已经分开了课.检查它是否适用于您：
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);
}
