android一个弹出菜单的动画(一)

先上效果图:




先写Layout文件:

<?xml version="1.0" encoding="utf-8"?

> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@android:color/white"> <ImageView android:id="@+id/sat_main" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/sat_main" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_marginLeft="5dp" /> <ImageView android:id="@+id/sat_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:visibility="gone" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" /> <ImageView android:id="@+id/clone_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:visibility="gone" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" /> </RelativeLayout>


这3个ImageView都在屏幕的底部,clone_item须要固定在球弹起的最高位置:

初始化这3个imageView:

  sat_main = (ImageView)findViewById(R.id.sat_main);
		final ImageView itemView = (ImageView)findViewById(R.id.sat_item);
		final ImageView cloneView = (ImageView)findViewById(R.id.clone_item);
		cloneView.setImageResource(R.drawable.searchable_web);
		itemView.setImageResource(R.drawable.searchable_web);
		itemView.setVisibility(View.GONE);


初始化cloneView的位置:

//这个是使cloneview固定在leftmargin x bottomMargin y的地方
		RelativeLayout.LayoutParams layoutParams =(RelativeLayout.LayoutParams) cloneView.getLayoutParams();
		layoutParams.bottomMargin = Math.abs(y);
		layoutParams.leftMargin = Math.abs(x);
		cloneView.setLayoutParams(layoutParams);



点击button时候。button本身会旋转:

<?

xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/decelerate_interpolator" android:fromDegrees="0" android:toDegrees="-135" android:pivotX="50%" android:pivotY="50%" android:duration="300" android:fillAfter="true" android:fillEnabled="true"/>


用下面方法得到球的终于位置:x坐标是distance*cos(角度),y是distance*sin(角度)

	//取得distance的cos(degree)
	public static int getTranslateX(float degree, int distance) {
		return Double.valueOf(distance * Math.cos(Math.toRadians(degree))).intValue();
	}
	
	public static int getTranslateY(float degree, int distance){
        return Double.valueOf(-1 * distance * Math.sin(Math.toRadians(degree))).intValue();
    }
	 


然后球弹起的动画:

	public static Animation createItemOutAnimation(Context context, int index, long expandDuration, int x, int y){
    	
        AlphaAnimation alphaAnimation = new AlphaAnimation(0f, 1f);
        long alphaDuration = 60;
        if(expandDuration < 60){
        	alphaDuration = expandDuration / 4;
        }
        alphaAnimation.setDuration(alphaDuration);
        alphaAnimation.setStartOffset(0);

        //x和y是球弹到最高点的坐标
        TranslateAnimation translate = new TranslateAnimation(0, x, 0, y);
         
        translate.setStartOffset(0);
        translate.setDuration(expandDuration); 
        //OvershootInterpolator:表示向前甩一定值后再回到原来位置。

translate.setInterpolator(context, R.anim.sat_item_overshoot_interpolator); RotateAnimation rotate = new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); //AccelerateInterpolator:动画从開始到结束。变化率是一个加速的过程。 //DecelerateInterpolator:动画从開始到结束。变化率是一个减速的过程 rotate.setInterpolator(context, R.anim.sat_item_out_rotate_interpolator); long duration = 100; if(expandDuration <= 150){ duration = expandDuration / 3; } rotate.setDuration(expandDuration-duration); rotate.setStartOffset(duration); AnimationSet animationSet = new AnimationSet(false); animationSet.setFillAfter(false); animationSet.setFillBefore(true); animationSet.setFillEnabled(true); animationSet.addAnimation(alphaAnimation); animationSet.addAnimation(rotate); animationSet.addAnimation(translate); animationSet.setStartOffset(30*index); return animationSet; }



这个动画弹到最高点后,我们得使itemview gone掉。cloneview visible


代码的位置:http://download.csdn.net/detail/baidu_nod/7722621

posted @ 2017-06-26 13:09  wzjhoutai  阅读(774)  评论(0编辑  收藏  举报