好的,我正在尝试做一个合适的滑动动画。向下滑动的视图应该将所有视图推向一个平滑的运动,并且当它向上滑动时,所有视图都应该在一个平滑的运动中跟随。
我尝试了什么: 在代码中:
LinearLayout lin = (LinearLayout)findViewById(R.id.user_list_container);
setLayoutAnimSlidedownfromtop(lin, this);
lin.addView(getLayoutInflater().inflate(R.layout.user_panel,null),0);
和
public static void setLayoutAnimSlidedownfromtop(ViewGroup panel, Context ctx) {
AnimationSet set = new AnimationSet(true);
Animation animation = new AlphaAnimation(0.0f, 1.0f);
animation.setDuration(100);
set.addAnimation(animation);
animation = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f
);
animation.setDuration(500);
set.addAnimation(animation);
LayoutAnimationController controller =
new LayoutAnimationController(set, 0.25f);
panel.setLayoutAnimation(controller);
}
我的user_panel.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="vertical" >
<ImageView
android:layout_alignParentLeft="true"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/icon" />
</LinearLayout>
主要xml的顶部:
<LinearLayout
android:id="@+id/user_list_container"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/container"
android:layout_below="@+id/user_list_container"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
上述方法的问题在于,当我首先开始动画时,会创建视图的空白区域,然后视图向下滑动。我希望它能够慢慢地推动所有其他视图,而不是一次性地完成它。
答案 0 :(得分:56)
所以我最终自己做了一些帮助:https://stackoverflow.com/a/9112691/969325。 如果它是android 3.0(http://developer.android.com/guide/topics/graphics/animation.html)我可以使用属性动画,但不是这样我自己必须这样做。
以下是我最终的结果:
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
/**
* Class for handling collapse and expand animations.
* @author Esben Gaarsmand
*
*/
public class ExpandCollapseAnimation extends Animation {
private View mAnimatedView;
private int mEndHeight;
private int mType;
/**
* Initializes expand collapse animation, has two types, collapse (1) and expand (0).
* @param view The view to animate
* @param duration
* @param type The type of animation: 0 will expand from gone and 0 size to visible and layout size defined in xml.
* 1 will collapse view and set to gone
*/
public ExpandCollapseAnimation(View view, int duration, int type) {
setDuration(duration);
mAnimatedView = view;
mEndHeight = mAnimatedView.getLayoutParams().height;
mType = type;
if(mType == 0) {
mAnimatedView.getLayoutParams().height = 0;
mAnimatedView.setVisibility(View.VISIBLE);
}
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
if(mType == 0) {
mAnimatedView.getLayoutParams().height = (int) (mEndHeight * interpolatedTime);
} else {
mAnimatedView.getLayoutParams().height = mEndHeight - (int) (mEndHeight * interpolatedTime);
}
mAnimatedView.requestLayout();
} else {
if(mType == 0) {
mAnimatedView.getLayoutParams().height = mEndHeight;
mAnimatedView.requestLayout();
} else {
mAnimatedView.getLayoutParams().height = 0;
mAnimatedView.setVisibility(View.GONE);
mAnimatedView.requestLayout();
mAnimatedView.getLayoutParams().height = mEndHeight;
}
}
}
}
示例ussage:
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class AnimationTestActivity extends Activity {
private boolean mActive = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button animatedButton = (Button) findViewById(R.id.animatedButton);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
ExpandCollapseAnimation animation = null;
if(mActive) {
animation = new ExpandCollapseAnimation(animatedButton, 1000, 1);
mActive = false;
} else {
animation = new ExpandCollapseAnimation(animatedButton, 1000, 0);
mActive = true;
}
animatedButton.startAnimation(animation);
}
});
}
}
的xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/animatedButton"
android:visibility="gone"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="@string/hello"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"/>
</LinearLayout>
修改强>:
测量wrap_content高度:
因此,为了让它适用于wrap_content,我在开始动画之前测量了视图的高度,然后将此测量高度用作实际高度。 Bellow是用于测量视图高度的代码,并将其设置为新高度(我假设视图使用屏幕宽度,根据您自己的需要进行更改):
/**
* This methode can be used to calculate the height and set it for views with wrap_content as height.
* This should be done before ExpandCollapseAnimation is created.
* @param activity
* @param view
*/
public static void setHeightForWrapContent(Activity activity, View view) {
DisplayMetrics metrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
int widthMeasureSpec = MeasureSpec.makeMeasureSpec(screenWidth, MeasureSpec.EXACTLY);
view.measure(widthMeasureSpec, heightMeasureSpec);
int height = view.getMeasuredHeight();
view.getLayoutParams().height = height;
}
答案 1 :(得分:5)
谢谢Warpzit!这是一个非常有用的答案。在我的情况下,我只是尝试使用wrap_content高度为视图设置动画。我尝试过triggs两行建议,但它在我的情况下不起作用。 (我没有花太多时间去追求原因。)我最后使用一种稍微修改过的Warpzit ExpandCollapseAnimation
形式的静态方法来确定视图的高度
稍微详细一点:
setHeightForWrapContent()
类中包含了他的静态方法ExpandCollapseAnimation
。setHeightForWrapContent()
构造函数中的ExpandCollapseAnimation
来正确确定视图的高度。为此,我必须使用构造函数传递活动。applyTransformation()
方法中,当视图最终减小到零高度时,我将视图的高度返回到wrap_content。如果您不这样做,并在以后更改视图的内容,则在展开视图时,视图将扩展到之前确定的高度。代码在这里:
public class ExpandCollapseAnimation extends Animation {
private View mAnimatedView;
private int mEndHeight;
private int mType;
public ExpandCollapseAnimation(View view, int duration, int type, Activity activity) {
setDuration(duration);
mAnimatedView = view;
setHeightForWrapContent(activity, view);
mEndHeight = mAnimatedView.getLayoutParams().height;
mType = type;
if(mType == 0) {
mAnimatedView.getLayoutParams().height = 0;
mAnimatedView.setVisibility(View.VISIBLE);
}
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
if(mType == 0) {
mAnimatedView.getLayoutParams().height = (int) (mEndHeight * interpolatedTime);
} else {
mAnimatedView.getLayoutParams().height = mEndHeight - (int) (mEndHeight * interpolatedTime);
}
mAnimatedView.requestLayout();
} else {
if(mType == 0) {
mAnimatedView.getLayoutParams().height = mEndHeight;
mAnimatedView.requestLayout();
} else {
mAnimatedView.getLayoutParams().height = 0;
mAnimatedView.setVisibility(View.GONE);
mAnimatedView.requestLayout();
mAnimatedView.getLayoutParams().height = LayoutParams.WRAP_CONTENT; // Return to wrap
}
}
}
public static void setHeightForWrapContent(Activity activity, View view) {
DisplayMetrics metrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
int widthMeasureSpec = MeasureSpec.makeMeasureSpec(screenWidth, MeasureSpec.EXACTLY);
view.measure(widthMeasureSpec, heightMeasureSpec);
int height = view.getMeasuredHeight();
view.getLayoutParams().height = height;
}
}
再次感谢Warpzit!