在项目中，我们要求做一个纸飞机的功能：就是当打开这个界面时，会有4架纸飞机从屏幕左侧飞入，然后到达自己的位置坐上下浮动，同时云彩也不断地从屏幕右侧飘到屏幕左侧。当你点击其中一个纸飞机时，这个纸飞机先向上飞出屏幕外，再从左侧飞入，当飞机回到原来位置时，弹出一个消息框。下面直接上代码：
一、首先自定义一个RelativeLayout，主要目的就是制作飞机的进入动画：
public class PaperPlaneLayout extends RelativeLayout implements View.OnClickListener{
private OnClickListener mOnClickListener;
//自定义布局的宽、高
private int mHeight;
private int mWidth;
private LayoutParams lp;
private Drawable[] drawables;
private Random random = new Random();
//获取4架纸飞机的宽高
private int dHeight;
private int dWidth;
private int mX;
private int mY;
public PaperPlaneLayout(Context context) {
super(context);
init();
}
public PaperPlaneLayout(Context context,
AttributeSet attrs) {
super(context, attrs);
init();
}
public PaperPlaneLayout(Context context,
AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public PaperPlaneLayout(Context context,
AttributeSet attrs,int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init();
}
private void init() {
// 初始化显示的图片
drawables = new Drawable[4];
Drawable pink =
getResources().getDrawable(R.drawable.pl_pink);
Drawable yellow =
getResources().getDrawable(R.drawable.pl_yellow);
Drawable green =
getResources().getDrawable(R.drawable.pl_green);
Drawable blue =
getResources().getDrawable(R.drawable.pl_blue);
drawables[0] = blue;
drawables[1] = yellow;
drawables[2] = green;
drawables[3] = pink;
// 获取图的宽高 用于后面的计算
// 注意 我这里4张图片的大小都是一样的,所以我只取了一个
dHeight = UIUtility.dipTopx(getContext(), 80);
dWidth = UIUtility.dipTopx(getContext(), 80);
lp = new LayoutParams(dWidth, dHeight);
}
@Override
protected void onMeasure(int widthMeasureSpec,
int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
}
//真正动画开始的入口，从外部进行调用，x、y分别表示飞机进入之后所
//停留的位置坐标
public void addHeart(int x, int y, int position) {
mX = x;
mY = y;
ImageView imageView = new ImageView(getContext());
// 随机选一个
imageView.setImageDrawable(drawables[position]);
imageView.setLayoutParams(lp);
addView(imageView);
//获取进入前后动画
Animator set = getAnimator(imageView);
set.start();
imageView.setOnClickListener(this);
}
private Animator getAnimator(View target) {
AnimatorSet set = getEnterAnimator(target);
AnimatorSet set2 = getLineAnimation(target);
AnimatorSet finalSet = new AnimatorSet();
finalSet.playSequentially(set, set2);
finalSet.setInterpolator(new LinearInterpolator());
finalSet.setTarget(target);
return finalSet;
}
private AnimatorSet getEnterAnimator(final View target) {
ObjectAnimator alpha = ObjectAnimator
.ofFloat(target, View.ALPHA, 0.2f, 1f);
ObjectAnimator translatiOnX= ObjectAnimator
.ofFloat(target, View.TRANSLATION_X,
-2 * mWidth, -mWidth);
AnimatorSet enter = new AnimatorSet();
enter.setDuration(500);
enter.setInterpolator(new LinearInterpolator());
enter.playTogether(translationX, alpha);
enter.setTarget(target);
return enter;
}
private AnimatorSet getLineAnimation(final View iconView) {
ObjectAnimator transX = ObjectAnimator
.ofFloat(iconView, "translationX", -dWidth, mX);
ObjectAnimator transY = ObjectAnimator
.ofFloat(iconView, "translationY",
(mHeight - dHeight) / 2, mY);
transY.
setInterpolator(PathInterpolatorCompat
.create(0.7f, 1f));
AnimatorSet flyUpAnim = new AnimatorSet();
flyUpAnim.setDuration(900);
flyUpAnim.playTogether(transX, transY);
flyUpAnim.setTarget(iconView);
return flyUpAnim;
}
@Override
public void onClick(View v) {
if (mOnClickListener != null) {
mOnClickListener.onClick((ImageView) v);
}
}
//定义ImageView单击事件
public interface OnClickListener {
void onClick(ImageView v);
}
二、接下来就是布局文件的搭建了（只选取一部分控件）
三、接下来就可以在Activity中使用了：
public class PlaneActivity extends AppCompatActivity{
@Bind(R.id.img_white_cloud)
ImageView mImgWhiteCloud;
@Bind(R.id.plane_layout)
PaperPlaneLayout mPlaneLayout;
private Context mContext;
private ObjectAnimator objCloudAnim;
private TranslateAnimation planeAnimation;
private float iconX, iconY;
//设置飞机是否已点击，如果为true，则另一个飞机不可点击
private boolean mIsClick = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_plane_layout);
ButterKnife.bind(this);
mCOntext= getApplicationContext();
//初始化动画
initAnimation();
initListener();
}
private void initAnimation() {
//设定纸飞机进入的位置
initPlaneEnterAnimation();
//飞机进入后做上下浮动
initPlaneAnimation();
//云彩循环从屏幕右侧飘到屏幕左侧
initCloudAnimation();
}
//设定纸飞机进入的位置
private void initPlaneEnterAnimation() {
for (int i = 0; i <4; i++) {
final int temp = i;
mPlaneLayout.post(new Runnable() {
@Override
public void run() {
//下面的值根据用户自己设定
if (temp == 0) {
mPlaneLayout.addHeart(
100dp, 140dp, 0);
}
if (temp == 1) {
mPlaneLayout.addHeart(
屏宽 - 120dp, 190dp, 1);
}
if (temp == 2) {
mPlaneLayout.addHeart(
30dp, 240dp, 2);
}
if (temp == 3) {
mPlaneLayout.addHeart(
屏宽 - 210, 290, 3);
}
}
});
}
}
//飞机进入后做上下浮动
private void initPlaneAnimation() {
planeAnimation = new TranslateAnimation(0, 0, -10, 10);
planeAnimation.setDuration(1000);
planeAnimation.setRepeatCount(Animation.INFINITE);
planeAnimation.setRepeatMode(Animation.REVERSE);
mPlaneLayout.setAnimation(planeAnimation);
planeAnimation.start();
}
//云彩循环从屏幕右侧飘到屏幕左侧
private void initCloudAnimation() {
if (objCloudAnim == null) {
objCloudAnim = ObjectAnimator
.ofFloat(mImgWhiteCloud, "translationX",
屏宽 - 50, -屏宽);
// 设置持续时间
objCloudAnim.setDuration(5000);
// 设置循环播放
objCloudAnim.setRepeatCount(
ObjectAnimator.INFINITE);
}
objCloudAnim.start();
}
private void initListener() {
mPlaneLayout.setOnClickListener(new
PaperPlaneLayout.OnClickListener() {
@Override
public void onClick(ImageView v) {
if (mIsClick) {
mIsClick = false;
icOnX= v.getX();
icOnY= v.getY();
//当点击某一个纸飞机时，飞机会有一个飞出动画
planeOutAnimation(v);
}
}
});
}
/**
* 飞机飞出动画
*/
private void planeOutAnimation(final View iconView) {
AnimatorSet flyUpAnim = new AnimatorSet();
flyUpAnim.setDuration(600);
ObjectAnimator transX = ObjectAnimator
.ofFloat(iconView, "translationX",
iconView.getX(),
UIUtility.getScreenWidth(mContext) * 2);
ObjectAnimator transY = ObjectAnimator
.ofFloat(iconView, "translationY",
0,
- UIUtility.getScreenHeight(mContext) * 2);
transY.setInterpolator(PathInterpolatorCompat
.create(0.7f, 1f));
ObjectAnimator rotation = ObjectAnimator
.ofFloat(iconView, "rotation", -45, 0);
rotation.setInterpolator(new DecelerateInterpolator());
ObjectAnimator rotatiOnX= ObjectAnimator
.ofFloat(iconView, "rotationX", 0, 60);
rotationX.setInterpolator(
new DecelerateInterpolator());
flyUpAnim.playTogether(transX, transY, rotationX,
ObjectAnimator
.ofFloat(iconView, "scaleX", 1, 0.5f),
ObjectAnimator
.ofFloat(iconView, "scaleY", 1, 0.5f),
rotation
);
flyUpAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
// 飞机飞入动画
downPlaneAnimation(iconView);
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
flyUpAnim.start();
}
/**
* 飞机飞入动画
*/
private void downPlaneAnimation(final View iconView) {
final int offDistX = -iconView.getRight();
final int offDistY = -UIUtility.dipTopx(mContext, 10);
AnimatorSet flyDownAnim = new AnimatorSet();
flyDownAnim.setDuration(500);
ObjectAnimator transX1 = ObjectAnimator
.ofFloat(iconView, "translationX",
UIUtility.getScreenWidth(mContext), offDistX);
ObjectAnimator transY1 = ObjectAnimator
.ofFloat(iconView, "translationY",
- UIUtility.getScreenHeight(mContext),
offDistY);
transY1.setInterpolator(
PathInterpolatorCompat.create(0.1f, 1f));
ObjectAnimator rotation1 = ObjectAnimator
.ofFloat(iconView, "rotation",
iconView.getRotation(), 0);
rotation1.setInterpolator(
new AccelerateInterpolator());
flyDownAnim.playTogether(transX1, transY1,
ObjectAnimator
.ofFloat(iconView, "scaleX", 0.5f, 0.9f),
ObjectAnimator
.ofFloat(iconView, "scaleY", 0.5f, 0.9f),
rotation1
);
flyDownAnim.addListener(
new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
iconView.setRotationY(180);
}
@Override
public void onAnimationEnd(Animator animation) {
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
AnimatorSet flyInAnim = new AnimatorSet();
flyInAnim.setDuration(500);
flyInAnim.setInterpolator(
new DecelerateInterpolator());
ObjectAnimator tranX2 = ObjectAnimator
.ofFloat(iconView, "translationX",
offDistX, iconX);
ObjectAnimator tranY2 = ObjectAnimator
.ofFloat(iconView, "translationY",
offDistY, iconY);
ObjectAnimator rotationX2 = ObjectAnimator
.ofFloat(iconView, "rotationX", 30, 0);
flyInAnim.playTogether(tranX2, tranY2, rotationX2,
ObjectAnimator.ofFloat(iconView, "scaleX", 0.9f, 1f),
ObjectAnimator.ofFloat(iconView, "scaleY", 0.9f, 1f));
flyInAnim.setStartDelay(100);
flyInAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
iconView.setRotationY(0);
}
@Override
public void onAnimationEnd(Animator animation) {
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
AnimatorSet mFlyAnimator = new AnimatorSet();
mFlyAnimator.playSequentially(flyDownAnim, flyInAnim);
mFlyAnimator.start();
}
这样一来纸飞机的进入和点击离开动画就完成了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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