如何以编程方式做RotateAnimations完整的例子吗？ [英] Full example of how to programmatically do RotateAnimations?

问题描述

我希望有与该做的动作（平移）和旋转，如直上，左转，直行，......一车的各个步骤的动画。

I want to have an animation with various steps that do moves (translations) and rotations like "straight on, turn left, straight on, ...." of a car.

我能够做到这一点在 AnimationSet ，但不能在身边的我的车形象与RELATIVE_TO_SELF设置中心旋转。我知道

I am able to do this in an AnimationSet, but fail at rotating around the center of my car image with the "RELATIVE_TO_SELF" setting. I know about

Animation a = new RotateAnimation(0,90,Animation.RELATIVE_TO_SELF,0.5f,... )

有此目的。仍然在屏幕的左上角的发生旋转（或印刷品？）。

for this purpose. Still the rotation occurs around the upper left corner of the screen (or canvas?).

目前我解决这个通过手动跟踪每个动画步骤之后的位置，但是这是不理想的。

Currently I am solving this by manually keeping track of the position after each animation step, but this is suboptimal.

我怀疑我的初始布局设置是假的：

I suspect that my initial layout setup is bogus:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:orientation="vertical"
>
    <FrameLayout
            android:layout_height="wrap_content"
            android:layout_width="fill_parent">

        <!-- view that draws some background -->
        <de.bsd.turtlecar.SampleView android:id="@+id/graph_view"
              android:layout_height="350px"
              android:layout_width="fill_parent"
              android:visibility="invisible"
              />

        <!-- the car -->
        <ImageView android:id="@+id/car_view"
                   android:src="@drawable/turtle_car"
                   android:layout_height="wrap_content"
                   android:layout_width="wrap_content"
                   android:visibility="invisible"/>


    </FrameLayout>

   <Button ... onClick="run" ... />
</LinearLayout>

这表明该车在左上角（应出现在不同的地方 - 那里基本上动漫起步较晚它应该在稍后移动）

This shows the car in the upper left corner (should show up in a different place -- basically where the animation later starts. And it should be move later).

在我的code，它是通过运行按钮，我做的触发：

In my code that is triggered through the run button I do:

    ImageView carView = (ImageView) findViewById(R.id.car_view);
    print(carView);
    AnimationSet animationSet = new AnimationSet(true);

    TranslateAnimation a = new TranslateAnimation(
            Animation.ABSOLUTE,200, Animation.ABSOLUTE,200,
            Animation.ABSOLUTE,200, Animation.ABSOLUTE,200);
    a.setDuration(1000);
    animationSet.addAnimation(a);

    RotateAnimation r = new RotateAnimation(0f, -90f,200,200); // HERE 
    r.setStartOffset(1000);
    r.setDuration(1000);
    animationSet.addAnimation(r);
    ...

因此​​，在这里的点，旋转的作品，但我必须保持跟踪。如果我旋转RELATIVE_TO_SELF，旋转发生在屏幕的周围（0,0）。

So at the point with here, the rotation works, but I have to keep track. if I rotate RELATIVE_TO_SELF, the rotation happens around (0,0) of the screen.

其他的问题：我能做些什么，以保持车内屏幕上的动画后完成

Additional question: what can I do in order to keep the car on screen after the animation has finished?

或完全是我在错误的轨道上吗？

Or am I completely on the wrong track?

推荐答案

尝试添加 setFillAfter（真）以您的动画。这必将让这款车在其最后的地方，它可能会解决您的旋转点的问题太

Try adding setFillAfter(true) to your Animations. That will certainly keep the car in its final place and it may solve your rotation point problems too

 TranslateAnimation a = new TranslateAnimation(
        Animation.ABSOLUTE,200, Animation.ABSOLUTE,200,
        Animation.ABSOLUTE,200, Animation.ABSOLUTE,200);
a.setDuration(1000);
a.setFillAfter(true); //HERE
animationSet.addAnimation(a);

RotateAnimation r = new RotateAnimation(0f, -90f,200,200); // HERE 
r.setStartOffset(1000);
r.setDuration(1000);
r.setFillAfter(true); //HERE
animationSet.addAnimation(r);
...

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