ZigZag動畫的形象在Android

Question

我正在工作的一個Android應用程序，我有10個氣球 我想動畫這些氣球曲折曲折風格。 我正在usning valueanimator 我的代碼是

Display display = getWindowManager().getDefaultDisplay(); 
    display.getRectSize(mDisplaySize); 

    DisplayMetrics metrics = new DisplayMetrics(); 
    display.getMetrics(metrics); 
    mScale = metrics.density; 

    mRootLayout = (RelativeLayout) findViewById(R.id.main_layout); 

    new Timer().schedule(new ExeTimerTask(), 0, 2000); 
} 

public void startAnimation(final ImageView aniView) { 

    aniView.setPivotX(aniView.getWidth()/2); 
    aniView.setPivotY(aniView.getHeight()/2); 
    aniView.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 
      Toast.makeText(getBaseContext(), "Clicked", Toast.LENGTH_SHORT).show(); 

     } 
    }); 
    long delay = new Random().nextInt(Constants.MAX_DELAY); 

    final ValueAnimator animator = ValueAnimator.ofFloat(0, 1); 
    animator.setDuration(Constants.ANIM_DURATION); 
    animator.setInterpolator(new AccelerateInterpolator()); 
    animator.setStartDelay(delay); 

    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 

    // int angle = 40 + (int)(Math.random() * 101); 
     //int angle = 40 + (int)(Math.random() * 101); 
     int movex = new Random().nextInt(mDisplaySize.right); 

     @Override 
     public void onAnimationUpdate(ValueAnimator animation) { 
      float value = ((Float) (animation.getAnimatedValue())).floatValue(); 
     // aniView.setRotation(angle*value); 
      aniView.setTranslationX((movex-40)*value); 
      aniView.setTranslationY((mDisplaySize.bottom + (150*mScale))*value); 



     } 
    }); 

    animator.start(); 

} 

private Handler mHandler = new Handler() { 
    @Override 
    public void handleMessage(Message msg) { 
     super.handleMessage(msg); 
     int viewId = new Random().nextInt(LEAVES.length); 
     Drawable d = getResources().getDrawable(LEAVES[viewId]); 
     LayoutInflater inflate = LayoutInflater.from(FallAnimationActivity.this); 
     ImageView imageView = (ImageView) inflate.inflate(R.layout.ani_image_view, null); 
     imageView.setImageDrawable(d); 
     mRootLayout.addView(imageView); 

     mAllImageViews.add(imageView);   

     LayoutParams animationLayout = (LayoutParams) imageView.getLayoutParams(); 
     animationLayout.setMargins(0, (int)(-150*mScale), 0, 0); 
     animationLayout.width = (int) (60*mScale); 
     animationLayout.height = (int) (60*mScale); 

     startAnimation(imageView); 
    } 
}; 

private class ExeTimerTask extends TimerTask { 
    @Override 
    public void run() { 
     // we don't really use the message 'what' but we have to specify something. 
     mHandler.sendEmptyMessage(Constants.EMPTY_MESSAGE_WHAT); 
    } 
} 

但它的運動並不曲折如何使動畫曲折任何想法，在此先感謝

Answer 1

試試這個：

class ZigZagAnimation extends Animation { 
    private PathMeasure pm; 
    float[] pos = new float[2]; 

    public ZigZagAnimation() { 
     Path p = new Path(); 
     p.moveTo(0f, 0f); 
     p.lineTo(12f, 5f); 
     p.lineTo(8f, 14f); 
     p.lineTo(25f, 17f); 
     p.lineTo(13f, 31f); 
     pm = new PathMeasure(p, false); 
     setDuration(4000); 
    } 

    @Override 
    protected void applyTransformation(float interpolatedTime, Transformation t) { 
     float distance = pm.getLength() * interpolatedTime; 
     pm.getPosTan(distance, pos, null); 
     t.getMatrix().postTranslate(pos[0], pos[1]); 
    } 
}