如何将带有动画的视图从当前位置(平移,旋转和缩放)移动到矩阵的新状态?
当前值(...)==> animate ==>新值(比例:1,transX:20,transY:700,角度:0)
我使用以下代码,移动没有动画。
Matrix matrix = new Matrix();
matrix.setTranslate(20, 700);
MyAnimation animation = new MyAnimation(matrix);
animation.setDuration(1000);
animation.setFillAfter(true);
text_object.setAnimation(animation);
MyAnimation.java
public class MyAnimation extends Animation {
private Matrix matrix;
public MyAnimation(Matrix matrix) {
this.matrix = matrix;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
t.getMatrix().set(matrix);
}
}
如何让动画有效? 可以使用哪些替代方案来实现这一目标?
答案 0 :(得分:0)
为什么要彻底修改Matrix
的{{1}}来动画它的缩放和翻译。只需使用View
即可。您可以在此处详细了解:http://developer.android.com/guide/topics/graphics/prop-animation.html
您可以使用Property Animation
执行所需的动画。
答案 1 :(得分:0)
这个问题对我有帮助,所以尽管它已经过时了,但我会发表评论以防它可能对其他人有所帮助。
要设置矩阵动画,您需要针对interpolatedTime
进行更改。发生的情况是,每次动画运行时您都将矩阵连续设置为相同的值,这就是为什么它不起作用的原因。
有几种方法可以处理矩阵,即
Matrix.setRectToRect()
Matrix.setPolyToPoly()
Matrix.setValues()
或使用更标准的API。
这是我正在使用的课程:
import android.graphics.Matrix;
import android.graphics.PointF;
import android.view.animation.Animation;
import android.view.animation.Transformation;
public class MatrixAnimation extends Animation {
private PointF scaleStart;
private PointF scaleEnd;
private PointF translateStart;
private PointF translateEnd;
private boolean animated = true;
MatrixAnimation(Matrix startMatrix, Matrix endMatrix){
this(startMatrix, endMatrix, true);
}
MatrixAnimation(Matrix startMatrix, Matrix endMatrix, boolean animated){
float[] a = new float[9];
float[] b = new float[9];
startMatrix.getValues(a);
endMatrix.getValues(b);
scaleStart = new PointF(a[Matrix.MSCALE_X], a[Matrix.MSCALE_Y]);
scaleEnd = new PointF(b[Matrix.MSCALE_X], b[Matrix.MSCALE_Y]);
translateStart = new PointF(a[Matrix.MTRANS_X], a[Matrix.MTRANS_Y]);
translateEnd = new PointF(b[Matrix.MTRANS_X], b[Matrix.MTRANS_Y]);
setFillAfter(true);
//setInterpolator(new DecelerateInterpolator());
}
protected MatrixAnimation setAnimated(boolean animated){
this.animated = animated;
setDuration(animated ? 300 : 0);
return this;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
final Matrix matrix = t.getMatrix();
PointF sFactor = new PointF(
scaleEnd.x * interpolatedTime / scaleStart.x + 1 - interpolatedTime,
scaleEnd.y * interpolatedTime / scaleStart.y + 1 - interpolatedTime);
PointF tFactor = new PointF(
(translateEnd.x - translateStart.x) * interpolatedTime,
(translateEnd.y - translateStart.y) * interpolatedTime);
//Log.d(TAG, "applyTransformation: " + sFactor + " " + tFactor);
matrix.postScale(scaleStart.x, scaleStart.y, 0, 0);
matrix.postScale(sFactor.x, sFactor.y, 0, 0);
matrix.postTranslate(translateStart.x, translateStart.y);
matrix.postTranslate(tFactor.x, tFactor.y);
}
@Override
public void start() {
setAnimated(true);
super.start();
}
public void start(boolean animated){
setAnimated(animated);
super.start();
}
}