一.前言
更新技术公号的好处之一是它会逼着你去学习一个新的东西，今天是一个中间打开Activity效果的动画，可以保存当工具类直接使用！
二.类下载地址
http://download.csdn.net/download/xiangyong_1521/10040916
三.先来看实现效果
四.主要代码
- MainActivity
findViewById(R.id.one).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ActivitySplitAnimationUtil.startActivity(Activity1.this, new Intent(Activity1.this, Activity2.class));
}
});- ActivitySplitAnimationUtil.java
/**
* Utility class to create a split activity animation
*
* @author Udi Cohen (@udinic)
*/
public class ActivitySplitAnimationUtil {
public static Bitmap mBitmap = null;
private static int[] mLoc1;
private static int[] mLoc2;
private static ImageView mTopImage;
private static ImageView mBottomImage;
private static AnimatorSet mSetAnim;
/**
* Start a new Activity with a Split animation
*
* @param currActivity The current Activity
* @param intent The Intent needed tot start the new Activity
* @param splitYCoord The Y coordinate where we want to split the Activity on the animation. -1 will split the Activity equally
*/
public static void startActivity(Activity currActivity, Intent intent, int splitYCoord) {
// Preparing the bitmaps that we need to show
prepare(currActivity, splitYCoord);
currActivity.startActivity(intent);
currActivity.overridePendingTransition(0, 0);
}
/**
* Start a new Activity with a Split animation right in the middle of the Activity
*
* @param currActivity The current Activity
* @param intent The Intent needed tot start the new Activity
*/
public static void startActivity(Activity currActivity, Intent intent) {
startActivity(currActivity, intent, -1);
}
/**
* Preparing the graphics on the destination Activity.
* Should be called on the destination activity on Activity#onCreate() BEFORE setContentView()
*
* @param destActivity the destination Activity
*/
public static void prepareAnimation(final Activity destActivity) {
mTopImage = createImageView(destActivity, mBitmap, mLoc1);
mBottomImage = createImageView(destActivity, mBitmap, mLoc2);
}
/**
* 启动动画，显示目标Activity
* Should be called on the destination activity on Activity#onCreate() AFTER setContentView()
*
* @param destActivity the 目标 Activity
* @param duration The 持续时间 of the animation
* @param interpolator The interpulator to use for the animation. null for no interpulation.
*/
public static void animate(final Activity destActivity, final int duration, final TimeInterpolator interpolator) {
// 在UI线程的消息队列上发布这个消息。我们需要对这些项目进行测量
new Handler().post(new Runnable() {
@Override
public void run() {
mSetAnim = new AnimatorSet();
mTopImage.setLayerType(View.LAYER_TYPE_HARDWARE, null);
mBottomImage.setLayerType(View.LAYER_TYPE_HARDWARE, null);
mSetAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
clean(destActivity);
}
@Override
public void onAnimationCancel(Animator animation) {
clean(destActivity);
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
// Animating the 2 parts away from each other
Animator anim1 = ObjectAnimator.ofFloat(mTopImage, "translationY", mTopImage.getHeight() * -1);
Animator anim2 = ObjectAnimator.ofFloat(mBottomImage, "translationY", mBottomImage.getHeight());
if (interpolator != null) {
anim1.setInterpolator(interpolator);
anim2.setInterpolator(interpolator);
}
mSetAnim.setDuration(duration);
mSetAnim.playTogether(anim1, anim2);
mSetAnim.start();
}
});
}
/**
* 启动显示目标Activity的动画
* Should be called on the destination activity on Activity#onCreate() AFTER setContentView()
*
* @param destActivity the destination Activity
* @param duration The duration of the animation
*/
public static void animate(final Activity destActivity, final int duration) {
animate(destActivity, duration, new DecelerateInterpolator());
}
/**
* Cancel an in progress animation
*/
public static void cancel() {
if (mSetAnim != null)
mSetAnim.cancel();
}
/**
* Clean stuff
*
* @param activity The Activity where the animation is occurring
*/
private static void clean(Activity activity) {
if (mTopImage != null) {
mTopImage.setLayerType(View.LAYER_TYPE_NONE, null);
try {
// If we use the regular removeView() we'll get a small UI glitch
activity.getWindowManager().removeViewImmediate(mBottomImage);
} catch (Exception ignored) {
}
}
if (mBottomImage != null) {
mBottomImage.setLayerType(View.LAYER_TYPE_NONE, null);
try {
activity.getWindowManager().removeViewImmediate(mTopImage);
} catch (Exception ignored) {
}
}
mBitmap = null;
}
/**
* 为动画制作图形
*
* @param currActivity the current Activity from where we start the new one
* @param splitYCoord The Y coordinate where we want to split the activity. -1 will split the activity equally
*/
private static void prepare(Activity currActivity, int splitYCoord) {
// 获取activity的内容并放入一个位图
View root = currActivity.getWindow().getDecorView().findViewById(android.R.id.content);
root.setDrawingCacheEnabled(true);
mBitmap = root.getDrawingCache();
// If the split Y coordinate is -1 - We'll split the activity equally
splitYCoord = (splitYCoord != -1 ? splitYCoord : mBitmap.getHeight() / 2);
if (splitYCoord > mBitmap.getHeight())
throw new IllegalArgumentException("Split Y coordinate [" splitYCoord "] exceeds the activity's height [" mBitmap.getHeight() "]");
// Set the location to put the 2 bitmaps on the destination activity
mLoc1 = new int[]{0, splitYCoord, root.getTop()};
mLoc2 = new int[]{splitYCoord, mBitmap.getHeight(), root.getTop()};
}
/**
* 创建一个映像，在目标Activity中包含动画的一个部分
*
* @param destActivity The destination activity
* @param bmp The Bitmap of the part we want to add to the destination activity
* @param loc The location this part should be on the screen
* @return
*/
private static ImageView createImageView(Activity destActivity, Bitmap bmp, int loc[]) {
MyImageView imageView = new MyImageView(destActivity);
imageView.setImageBitmap(bmp);
imageView.setImageOffsets(bmp.getWidth(), loc[0], loc[1]);
WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();
windowParams.gravity = Gravity.TOP;
windowParams.x = 0;
windowParams.y = loc[2] loc[0];
windowParams.height = loc[1] - loc[0];
windowParams.width = bmp.getWidth();
windowParams.flags = WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
windowParams.format = PixelFormat.TRANSLUCENT;
windowParams.windowAnimations = 0;
destActivity.getWindowManager().addView(imageView, windowParams);
return imageView;
}
/**
* MyImageView
* Extended ImageView that draws just part of an image, base on start/end position
*/
private static class MyImageView extends ImageView
{
private Rect mSrcRect;
private Rect mDstRect;
private Paint mPaint;
public MyImageView(Context context)
{
super(context);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
/**
* 设置位图来控制可见区域
*
* @param width The bitmap image
* @param bmp The start Y position
* @param loc The end Y position
* @return
*/
public void setImageOffsets(int width, int startY, int endY)
{
mSrcRect = new Rect(0, startY, width, endY);
mDstRect = new Rect(0, 0, width, endY - startY);
}
@Override
protected void onDraw(Canvas canvas)
{
Bitmap bm = null;
Drawable drawable = getDrawable();
if (null != drawable && drawable instanceof BitmapDrawable)
{
bm = ((BitmapDrawable)drawable).getBitmap();
}
if (null == bm)
{
super.onDraw(canvas);
}
else
{
canvas.drawBitmap(bm, mSrcRect, mDstRect, mPaint);
}
}
}
}
