我想使用Android动画框架来计算一段时间内的移动。但是,我创建的TranslateAnimations似乎总是表明它们在我为getTransformation进行的每次调用中都已结束,并且转换显示不正确。在下面的代码中,我希望在运行void1()和void2()之后输出以下Log:
最初测试1:100.0,1000.0(真)
2.5秒后测试1:150.0,1500.0(真)
最初测试2:100.0,1000.0(真)
2.5秒后测试2:150.0,1500.0(真)
相反,我得到了这个输出:
最初测试1:12.0,34.0(真)
2.5秒后测试1:12.0,34.0(真)
最初测试2:0.0,0.0(真)
2.5秒后测试2:0.0,0.0(真)
void test1() {
Animation anim = new TranslateAnimation(100, 1000, 200, 2000);
anim.setFillAfter(true);
anim.setFillBefore(true);
anim.setDuration(5000);
anim.startNow();
Transformation t = new Transformation();
boolean hasended = anim.getTransformation(AnimationUtils.currentAnimationTimeMillis(), t);
float newpts[] = {12, 34};
t.getMatrix().mapPoints(newpts);
Log.v("AnimationTest", "Test 1 initially: " + newpts[0] + ", " + newpts[1] + " (" + hasended + ")");
long target = System.currentTimeMillis() + 2500;
while (System.currentTimeMillis() < target)
System.gc();
hasended = anim.getTransformation(AnimationUtils.currentAnimationTimeMillis(), t);
t.getMatrix().mapPoints(newpts);
Log.v("AnimationTest", "Test 1 after 2.5 seconds: " + newpts[0] + ", " + newpts[1] + " (" + hasended + ")");
}
void test2() {
Animation anim = new TranslateAnimation(100, 1000, 200, 2000);
anim.setFillAfter(true);
anim.setFillBefore(true);
anim.setDuration(5000);
anim.startNow();
//Based on http://stackoverflow.com/questions/4112599/android-how-to-stop-animation-cancel-does-not-work
Transformation t = new Transformation();
boolean hasended = anim.getTransformation(AnimationUtils.currentAnimationTimeMillis(), t);
Matrix transformationMatrix = t.getMatrix();
float[] matrixValues = new float[9];
transformationMatrix.getValues(matrixValues);
float transX = matrixValues[Matrix.MTRANS_X];
float transY = matrixValues[Matrix.MTRANS_Y];
Log.v("AnimationTest", "Test 2 initially: " + transX + ", " + transY + " (" + hasended + ")");
long target = System.currentTimeMillis() + 2500;
while (System.currentTimeMillis() < target)
System.gc();
hasended = anim.getTransformation(AnimationUtils.currentAnimationTimeMillis(), t);
transformationMatrix = t.getMatrix();
transformationMatrix.getValues(matrixValues);
transX = matrixValues[Matrix.MTRANS_X];
transY = matrixValues[Matrix.MTRANS_Y];
Log.v("AnimationTest", "Test 2 after 2.5 seconds: " + transX + ", " + transY + " (" + hasended + ")");
}
我如何得到我期待的结果?
答案 0 :(得分:1)
上面的代码有两个问题 - 第一个是必须在TranslateAnimation返回getTransformation()的有效结果之前调用initialize()。第二个是getTransformation()返回动画是否仍在运行,而不是它是否已经停止。完成这两项更改后,代码将按预期工作。
答案 1 :(得分:0)
你不能简单implement AnimationListener
吗?在onAnimationEnd()
范围内,您可以重新初始化它们或测试之间需要做什么吗?