Android 3D rotation animation camera and Matrix

The previous two blogs are all about Android 2D animations, what if you want to make a very cool 3D animation effect? Android does not provide 3D animation interface to the user, so we have to rewrite such a 3D interface animation ourselves.

The interface is as follows:

/* * @Title: My3danimation.java * @Description:todo< Please describe what this file does > * @author: XJP * @data: September 15, 2014 Morning 8:54:10 * @ve rsion:v1.0 */package com.xjp.animator;import Android.graphics.camera;import android.graphics.matrix;import Android.view.animation.animation;import android.view.animation.transformation;/** * todo< Please describe what this class is for > * * @ Author XJP * @data: September 15, 2014 Morning 8:54:10 * @version: V1.0 */public class My3danimation extends Animation {private final FL Oat mfromdegrees;private final float mtodegrees;private final float mcenterx;private final float mcentery;private final fl Oat mdepthz;private Camera mcamera;private int mdirection;private final static int rotate_x = 0;//Rotate Private final stat along the X axis IC int rotate_y = 1;//rotates along the y axis/** * Creates a new 3D rotation on the y axis. The rotation is defined by its * start angle and its end angle. Both angles is in degrees. The rotation * is performed around a center point in the 2D space, definied by a pair of * X and Y coordinates, called CEN TErX and CenterY. When the animation * starts, a translation on the Z axis (depth) is performed. The length of * The translation can is specified, as well as whether the translation * should is reversed in time. * * @param direction * The direction of the 3D rotation * @param fromdegrees * The start angle of t  He 3D rotation * @param todegrees * The end angle of the 3D rotation * @param centerx * The X Center of the 3D rotation * @param centery * The Y center of the 3D rotation */public my3danimation (int direction, FL Oat fromdegrees, float todegrees,float CenterX, float centery, float depthz) {mdirection = Direction;mfromdegrees = FromDe Grees;mtodegrees = Todegrees;mcenterx = Centerx;mcentery = Centery;mdepthz = Depthz;} @Overridepublic void Initialize (int width, int height, int parentwidth,int parentheight) {super.initialize (width, height , Parentwidth, parentheight); Mcamera = new Camera ();} @Overrideprotected void Applytransformation(float interpolatedtime, transformation t)  {Final float fromdegrees = mfromdegrees;float degrees = fromdegrees+ ((mtodegrees-fromdegrees) * interpolatedtime); final float CenterX = mcenterx;final float centery = mcentery;final camera camera = mcamera;final Matrix matrix = T.getmatrix () ; Camera.save (); if (centerx!=0) {if (Interpolatedtime < 0.5) {camera.translate (0.0f, 0.0f, Mdepthz * interpolatedtime) ;} else {camera.translate (0.0f, 0.0f, Mdepthz * (1.0f-interpolatedtime));}} Switch (mdirection) {case ROTATE_X:camera.rotateX (degrees); break;case ROTATE_Y:camera.rotateY (degrees); Camera.getmatrix (matrix); Camera.restore (); Matrix.pretranslate (-centerx,-centery); Matrix.posttranslate (CenterX, centery);}}

The sample code is as follows:

Package Com.xjp.animator;import Com.xjp.animator.r;import Android.os.bundle;import android.view.view;import Android.view.viewgroup;import Android.view.animation.linearinterpolator;import Android.widget.ImageView;import Android.app.activity;public class Mainactivity extends Activity implementsandroid.view.View.OnClickListener {private ImageView img1;private ImageView img2;private ImageView img3;private viewgroup mcontainer;private final static int ROTATE _x = 0;private final static int rotate_y = 1;private my3danimation my3danimation; @Overrideprotected void OnCreate (Bundle s Avedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); FindViews ();} /** * todo< Please describe what this method is for > * * @throw * @return void * @param */private void Findviews () {//TODO auto-generated Meth Od stubmcontainer = (viewgroup) Findviewbyid (R.id.container); Mcontainer.setpersistentdrawingcache ( Viewgroup.persistent_animation_cache); img1 = (ImageView) Findviewbyid (r.id.img_left); Img1.setoNclicklistener (this), Img2 = (ImageView) Findviewbyid (r.id.img_right); Img2.setonclicklistener (this); IMG3 = ( ImageView) Findviewbyid (r.id.img_3); Img3.setonclicklistener (this);} @Overridepublic void OnClick (View v) {//TODO auto-generated method Stubfloat CenterX = V.getwidth ()/2.0f;float CenterY = V.getheight ()/2.0f;if (V.getid () = = R.id.img_left) {my3danimation = new my3danimation (rotate_x, 0, Centerx,center Y, 310f);} if (v.getid () = = r.id.img_right) {my3danimation = new my3danimation (rotate_y, 0,, Centerx,centery, 310f);} if (v.getid () = = r.id.img_3) {CenterX = 0;my3danimation = new My3danimation (rotate_y, 0, Centerx,centery, 310f);} My3danimation.setduration (+); My3danimation.setinterpolator (new Linearinterpolator ()); My3danimation.setfillafter (True); V.startanimation (my3danimation);}}

End.

Android 3D rotation animation camera and Matrix