我指的是在这里找到的扩展/折叠动画代码.
虽然这样做不好,动画不顺利.
我做一些登录代码.
public static void expand(final View v) {
v.measure(MeasureSpec.makeMeasureSpec(((View)v.getParent()).getWidth(), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(1024, MeasureSpec.AT_MOST));
final int targtetHeight = v.getMeasuredHeight();
v.getLayoutParams().height = 0;
v.setVisibility(View.VISIBLE);
Animation a = new Animation()
{
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
v.getLayoutParams().height = interpolatedTime == 1
? LayoutParams.WRAP_CONTENT
: (int)(targtetHeight * interpolatedTime);
Log.i("CHEOK", "E v.getLayoutParams().height = " + v.getLayoutParams().height);
v.requestLayout();
}
将打印以下日志消息.
10-09 12:29:58.808: I/CHEOK(7874): E v.getLayoutParams().height = 0
10-09 12:29:58.808: I/CHEOK(7874): E v.getLayoutParams().height = 0
10-09 12:29:58.918: I/CHEOK(7874): E v.getLayoutParams().height = 11
10-09 12:29:59.015: I/CHEOK(7874): E v.getLayoutParams().height = 35
10-09 12:29:59.117: I/CHEOK(7874): E v.getLayoutParams().height = 64
10-09 12:29:59.215: I/CHEOK(7874): E v.getLayoutParams().height = 85
10-09 12:29:59.316: I/CHEOK(7874): E v.getLayoutParams().height = -2
10-09 12:29:59.406: I/CHEOK(7874): E v.getLayoutParams().height = -2
新的高度每100ms发生一次.所以动画的FPS大约是10fps
我想看看什么是理想的动画帧率.我删除v.requestLayout();.我得到以下记录.
10-09 12:32:06.547: I/CHEOK(8926): E v.getLayoutParams().height = 0
10-09 12:32:06.562: I/CHEOK(8926): E v.getLayoutParams().height = 0
10-09 12:32:06.605: I/CHEOK(8926): E v.getLayoutParams().height = 4
10-09 12:32:06.625: I/CHEOK(8926): E v.getLayoutParams().height = 7
10-09 12:32:06.644: I/CHEOK(8926): E v.getLayoutParams().height = 10
10-09 12:32:06.664: I/CHEOK(8926): E v.getLayoutParams().height = 14
10-09 12:32:06.679: I/CHEOK(8926): E v.getLayoutParams().height = 18
10-09 12:32:06.699: I/CHEOK(8926): E v.getLayoutParams().height = 22
10-09 12:32:06.715: I/CHEOK(8926): E v.getLayoutParams().height = 27
10-09 12:32:06.734: I/CHEOK(8926): E v.getLayoutParams().height = 32
10-09 12:32:06.750: I/CHEOK(8926): E v.getLayoutParams().height = 37
10-09 12:32:06.769: I/CHEOK(8926): E v.getLayoutParams().height = 42
10-09 12:32:06.785: I/CHEOK(8926): E v.getLayoutParams().height = 47
10-09 12:32:06.804: I/CHEOK(8926): E v.getLayoutParams().height = 52
10-09 12:32:06.828: I/CHEOK(8926): E v.getLayoutParams().height = 59
10-09 12:32:06.840: I/CHEOK(8926): E v.getLayoutParams().height = 62
10-09 12:32:06.863: I/CHEOK(8926): E v.getLayoutParams().height = 67
10-09 12:32:06.879: I/CHEOK(8926): E v.getLayoutParams().height = 71
10-09 12:32:06.894: I/CHEOK(8926): E v.getLayoutParams().height = 75
10-09 12:32:06.910: I/CHEOK(8926): E v.getLayoutParams().height = 79
10-09 12:32:06.929: I/CHEOK(8926): E v.getLayoutParams().height = 82
10-09 12:32:06.945: I/CHEOK(8926): E v.getLayoutParams().height = 85
10-09 12:32:06.965: I/CHEOK(8926): E v.getLayoutParams().height = 88
10-09 12:32:06.984: I/CHEOK(8926): E v.getLayoutParams().height = 89
10-09 12:32:07.000: I/CHEOK(8926): E v.getLayoutParams().height = 91
10-09 12:32:07.019: I/CHEOK(8926): E v.getLayoutParams().height = 91
10-09 12:32:07.039: I/CHEOK(8926): E v.getLayoutParams().height = -2
10-09 12:32:07.054: I/CHEOK(8926): E v.getLayoutParams().height = -2
每约20ms出现新的高度.所以动画的FPS大概是50fps
当然,我不能删除requestLayout,因为UI不会在屏幕上更新.
我在想,有没有什么改进可以做到,实现动画FPS关闭到50fps？我看到一些商业产品具有平滑的Expand / collapse示例.所以,我认为这是可以实现的.就这样,我不知道究竟如何.
我的布局代码如下：
android:clickable="true"
android:id="@+id/chart_linear_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:background="@drawable/dummy"
android:orientation="vertical">
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal">
android:layout_width="0dp"
android:width="0dp"
android:layout_weight="0.6"
android:layout_height="wrap_content"
android:gravity="left"
android:textSize="20sp"
android:textColor="#ff000000"
android:text="Summary chart" />
android:id="@+id/chart_price_text_view"
android:layout_width="0dp"
android:width="0dp"
android:layout_weight="0.4"
android:layout_height="wrap_content"
android:gravity="right"
android:textSize="20sp"
android:textColor="#ffF76D3C"
android:text="$2.99" />
android:visibility="gone"
android:id="@+id/chart_description_text_view"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/currency_exchange_description"
android:textColor="#ff626262"
android:textSize="15sp" />
我希望在chart_description_text_view上执行流畅的动画
折叠(应用程式启动期间)
扩展(当用户点击它时)
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