# 兩個activity的3D翻轉動畫.md

### 三.代碼實現

import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.graphics.Camera;
import android.graphics.Matrix;

/**
* An animation that rotates the view on the Y axis between two specified angles.
* This animation also adds a translation on the Z axis (depth) to improve the effect.
*/
public class Rotate3dAnimation extends Animation {
private final float mFromDegrees;
private final float mToDegrees;
private final float mCenterX;
private final float mCenterY;
private final float mDepthZ;
private final boolean mReverse;
private Camera mCamera;

/**
* Creates a new 3D rotation on the Y axis. The rotation is defined by its
* start angle and its end angle. Both angles are in degrees. The rotation
* is performed around a center point on the 2D space, definied by a pair
* of X and Y coordinates, called centerX and centerY. When the animation
* starts, a translation on the Z axis (depth) is performed. The length
* of the translation can be specified, as well as whether the translation
* should be reversed in time.
*
* @param fromDegrees the start angle of the 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
* @param reverse true if the translation should be reversed, false otherwise
*/
public Rotate3dAnimation(float fromDegrees, float toDegrees,
float centerX, float centerY, float depthZ, boolean reverse) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;
mCenterX = centerX;
mCenterY = centerY;
mDepthZ = depthZ;
mReverse = reverse;
}

@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
mCamera = new Camera();
}

@Override
protected 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 (mReverse) {
camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
} else {
camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
}
camera.rotateY(degrees);
camera.getMatrix(matrix);
camera.restore();

matrix.preTranslate(-centerX, -centerY);
matrix.postTranslate(centerX, centerY);
}
}

import android.app.Activity;
import android.util.Log;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;

public class RotationHelper {

DisplayNextView displayNext;

public RotationHelper(Activity con,int order){
displayNext = new DisplayNextView(con, order);
}

// 逆時針旋轉90
public void applyFirstRotation(ViewGroup layout,float start, float end) {
// Find the center of the container
final float centerX = layout.getWidth() / 2.0f;
final float centerY = layout.getHeight() / 2.0f;
Log.i("centerX =" + centerX, "centerX");
Log.i("centerY =" + centerY, "centerY");

// Create a new 3D rotation with the supplied parameter
// The animation listener is used to trigger the next animation
final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end,
centerX, centerY, 310.0f, true);
rotation.setDuration(700);
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
rotation.setAnimationListener(displayNext);
layout.startAnimation(rotation);
}

public void applyLastRotation(ViewGroup layout,float start, float end) {
// Find the center of the container
final float centerX = layout.getWidth() / 2.0f;
final float centerY = layout.getHeight() / 2.0f;
Log.i("centerX =" + centerX, "centerX");
Log.i("centerY =" + centerY, "centerY");

// Create a new 3D rotation with the supplied parameter
// The animation listener is used to trigger the next animation
final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end,
160, 192, 310.0f, false);
rotation.setDuration(700);
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
layout.startAnimation(rotation);
}
}

import android.app.Activity;
import android.view.animation.Animation;

public class DisplayNextView implements Animation.AnimationListener {

Object obj;

// 動畫監聽器的構造函數
Activity ac;
int order;

public DisplayNextView(Activity ac, int order) {
this.ac = ac;
this.order = order;
}

public void onAnimationStart(Animation animation) {
}

public void onAnimationEnd(Animation animation) {
doSomethingOnEnd(order);
}

public void onAnimationRepeat(Animation animation) {
}

private final class SwapViews implements Runnable {
public void run() {
switch (order) {
case Constants.KEY_FIRST_INVERSE:
((TranslateLayout) ac).jumpToSecond();
break;
case Constants.KEY_SECOND_CLOCKWISE:
((Second) ac).jumpToFirst();
break;
}
}
}

//動畫完成的監聽
public void doSomethingOnEnd(int _order) {
switch (_order) {
case Constants.KEY_FIRST_INVERSE:
((TranslateLayout) ac).layout1.post(new SwapViews());
break;

case Constants.KEY_SECOND_CLOCKWISE:
((Second) ac).layout2.post(new SwapViews());
break;
}
}
}
public class Constants {//相關常量

public final static int KEY_FIRST_INVERSE = 1;

public final static int KEY_FIRST_CLOCKWISE = 2;

public final static int KEY_SECOND_INVERSE = 3;

public final static int KEY_SECOND_CLOCKWISE = 4;
}

//第一個頁面
public class TranslateLayout extends Activity implements OnClickListener {

RelativeLayout layout1;

String tag="";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
ImageView first_btn = (ImageView) findViewById(R.id.first_btn);
first_btn.setOnClickListener(this);

layout1 = (RelativeLayout) findViewById(R.id.layout1);
showView();

}

public void showView() {
/* 取得Intent中的Bundle對象 */
Bundle bundle = this.getIntent().getExtras();

if (bundle != null) {
/* 取得Bundle對象中的數據 */
tag = bundle.getString("second","");
Log.d("first_tag",tag);
if (tag.equals("Second")) {
rotateHelper = new RotationHelper(this,
Constants.KEY_FIRST_CLOCKWISE);
rotateHelper.applyLastRotation(layout1, -90, 0);
}
}
}

RotationHelper rotateHelper;

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
rotateHelper = new RotationHelper(this, Constants.KEY_FIRST_INVERSE);
rotateHelper.applyFirstRotation(layout1, 0, -90);
}

@Override
protected void onPause() {
overridePendingTransition(0, 0);
super.onPause();
}

public void jumpToSecond() {
Intent in = new Intent();
in.setClass(this, Second.class);
// new一個Bundle對象，並將要傳遞的數據傳入
Bundle bundle = new Bundle();
bundle.putString("front", "First");
/* 將Bundle對象assign給Intent */
in.putExtras(bundle);
// 如果已經打開過的實例，將不會重新打開新的Activity
startActivity(in);
//關閉掉動畫
overridePendingTransition(0, 0);
}

}
/**
* Created by cxf on 2017/9/13.
*
* @title
* @describe
* @email [email protected]
*/

//第二個頁面
public class Second extends Activity implements OnClickListener {

String tag = "";

RotationHelper rotateHelper;

RelativeLayout layout2;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);

layout2 = (RelativeLayout) findViewById(R.id.layout2);
showView();
setListener();
}

public void setListener() {
ImageView second_btn = (ImageView) findViewById(R.id.second_btn);
second_btn.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
rotateHelper = new RotationHelper(this,
Constants.KEY_SECOND_CLOCKWISE);
rotateHelper.applyFirstRotation(layout2, 0, 90);
}

public void showView() {
/* 取得Intent中的Bundle對象 */
Bundle bundle = this.getIntent().getExtras();

if (bundle != null) {
/* 取得Bundle對象中的數據 */
tag = bundle.getString("front");
}

System.out.println("bundle =" + tag);

if (tag.equals("First")) {
rotateHelper = new RotationHelper(this, Constants.KEY_SECOND_INVERSE);
rotateHelper.applyLastRotation(layout2, 90, 0);
}
}

@Override
protected void onDestroy() {
overridePendingTransition(0, 0);
super.onDestroy();
}

public void jumpToFirst() {
Intent in = new Intent();
in.setClass(this, TranslateLayout.class);
Bundle bundle = new Bundle();
bundle.putString("second", "Second");
in.putExtras(bundle);
startActivity(in);
overridePendingTransition(0, 0);
finish();
}

}