Android 3D 旋转
1 public class Rotate3dAnimation extends Animation {
// 开始角度 2 private final float mFromDegrees;
// 结束角度 3 private final float mToDegrees;
// 旋转的x坐标 4 private final float mCenterX;
// 旋转的y坐标 5 private final float mCenterY;
// 旋转的z坐标 6 private final float mDepthZ;
// 是否扭曲 7 private final boolean mReverse; 8 private Camera mCamera; 9 10 /** 11 * Creates a new 3D rotation on the Y axis. The rotation is defined by its 12 * start angle and its end angle. Both angles are in degrees. The rotation 13 * is performed around a center point on the 2D space, definied by a pair 14 * of X and Y coordinates, called centerX and centerY. When the animation 15 * starts, a translation on the Z axis (depth) is performed. The length 16 * of the translation can be specified, as well as whether the translation 17 * should be reversed in time. 18 * 19 * @param fromDegrees the start angle of the 3D rotation 20 * @param toDegrees the end angle of the 3D rotation 21 * @param centerX the X center of the 3D rotation 22 * @param centerY the Y center of the 3D rotation 23 * @param reverse true if the translation should be reversed, false otherwise 24 */ 25 public Rotate3dAnimation(float fromDegrees, float toDegrees, 26 float centerX, float centerY, float depthZ, boolean reverse) { 27 mFromDegrees = fromDegrees; 28 mToDegrees = toDegrees; 29 mCenterX = centerX; 30 mCenterY = centerY; 31 mDepthZ = depthZ; 32 mReverse = reverse; 33 } 34 35 @Override 36 public void initialize(int width, int height, int parentWidth, int parentHeight) { 37 super.initialize(width, height, parentWidth, parentHeight); 38 mCamera = new Camera(); 39 } 40 41 @Override 42 protected void applyTransformation(float interpolatedTime, Transformation t) { 43 final float fromDegrees = mFromDegrees; 44 float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime); 45 46 final float centerX = mCenterX; 47 final float centerY = mCenterY; 48 final Camera camera = mCamera; 49 50 final Matrix matrix = t.getMatrix(); 51 52 camera.save(); 53 if (mReverse) { 54 camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime); 55 } else { 56 camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime)); 57 } 58 camera.rotateY(degrees); 59 camera.getMatrix(matrix); 60 camera.restore(); 61 62 matrix.preTranslate(-centerX, -centerY); 63 matrix.postTranslate(centerX, centerY); 64 } 65 }
调用：
1 img = (ImageView) view.findViewById(R.id.img); 2 img.setOnClickListener(new View.OnClickListener() { 3 @Override 4 public void onClick(View v) { 5 if (!isFront){ 6 applyRotation(0, 180); 7 isFront = true; 8 }else { 9 applyRotation(180, 360); 10 isFront = false; 11 } 12 } 13 }); 14 15 private void applyRotation(float start, float end) { 16 // 计算中心点 17 final float centerX = img.getWidth() / 2.0f; 18 final float centerY = img.getHeight() / 2.0f; 19 final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end, 20 centerX, centerY, 0f, true); 21 rotation.setDuration(1000); 22 rotation.setFillAfter(true); 23 rotation.setInterpolator(new AccelerateInterpolator()); 24 // 设置监听 25 rotation.setAnimationListener(new DisplayNextView()); 26 img.startAnimation(rotation); 27 test.startAnimation(rotation); 28 test.postDelayed(new Runnable() { 29 @Override 30 public void run() { 31 if (isFront){ 32 test.setText("我是大帝"); 33 }else{ 34 test.setText("世界你好"); 35 } 36 } 37 },700); 38 } 39 private final class DisplayNextView implements Animation.AnimationListener { 40 public void onAnimationStart(Animation animation) { 41 } 42 // 动画结束 43 public void onAnimationEnd(Animation animation) { 44 45 } 46 47 public void onAnimationRepeat(Animation animation) { 48 } 49 }
