动画应该做以下事情:
- 将屏幕垂直分割成两部分。
- 上部向上移动。
- 下部向下移动。
- 最后,反方向。(关闭屏幕)
这个想法非常简单:
为了获得Activity的位图:
View root = currActivity.getWindow().getDecorView().findViewById(android.R.id.content);
root.setDrawingCacheEnabled(true);
Bitmap bmp = root.getDrawingCache();
int splitYCoord = (splitYCoord != -1 ? splitYCoord : bmp.getHeight() / 2);
if (splitYCoord > bmp.getHeight())
throw new IllegalArgumentException("Split Y coordinate [" + splitYCoord + "] exceeds the activity's height [" + bmp.getHeight() + "]");
Bitmap mBmp1 = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), splitYCoord);
Bitmap mBmp2 = Bitmap.createBitmap(bmp, 0, splitYCoord, bmp.getWidth(), bmp.getHeight() - splitYCoord);
private static int[] mLoc1;
private static int[] mLoc2;
mLoc1 = new int[]{0, root.getTop()};
mLoc2 = new int[]{0, root.getTop() + splitYCoord};
private static ImageView mTopImage;
private static ImageView mBottomImage;
mTopImage = createImageView(destActivity, mBmp1, mLoc1);
mBottomImage = createImageView(destActivity, mBmp2, mLoc2);
private static ImageView createImageView(Activity destActivity, Bitmap bmp, int loc[]) {
ImageView imageView = new ImageView(destActivity);
imageView.setImageBitmap(bmp);
WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();
windowParams.gravity = Gravity.TOP;
windowParams.x = loc[0];
windowParams.y = loc[1];
windowParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
windowParams.width = ViewGroup.LayoutParams.WRAP_CONTENT;
windowParams.flags =
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
windowParams.format = PixelFormat.TRANSLUCENT;
windowParams.windowAnimations = 0;
destActivity.getWindowManager().addView(imageView, windowParams);
return imageView;
}
在我们创建位图之后,应用动画
AnimatorSet 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 onAnimationEnd(Animator animation) {
clean(destActivity);
}
@Override
public void onAnimationCancel(Animator animation) {
clean(destActivity);
}
...
});
Animator anim1 = ObjectAnimator.ofFloat(mTopImage, "translationY", mTopImage.getHeight() * -1);
Animator anim2 = ObjectAnimator.ofFloat(mBottomImage, "translationY", mBottomImage.getHeight());
mSetAnim.setDuration(duration);
mSetAnim.playTogether(anim1, anim2);
mSetAnim.start();
private void clean(Activity activity) {
if (mTopImage != null) {
mTopImage.setLayerType(View.LAYER_TYPE_NONE, null);
try {
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) {}
}
mBmp1 = null;
mBmp2 = null;
}