替换图片button放大效果的实现

1,需求背景；

    按钮 按下时图片变大；松开时缩小； 这种情况很多时候我们在onTouch事件是来个控件的缩放动画就可以轻松实现；但是UI提出不能这样做，图片放大后效果不一样的；有特效；那就UI切二个大小相同的图片，我们直接替换就好了；可是UI发现图标都按照放大的切根本摆不下；最后就切了二个不通大小的图片；

   如果，你直接替换图片的时候你会发现 放大的图片是被压缩的；

2，直接上代码； 懂得人自然秒懂；

   

public class MyZoomButton extends RelativeLayout {

    String text ;
    Drawable imgNormal ;
    Drawable imgPressed ;

    OnClickListener l ;

    public void setOnClickListener( OnClickListener l){
        this.l=l;
    }

    public MyZoomButton(Context context) {
        this(context,null);
    }

    public MyZoomButton(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyZoomButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context,attrs);
        addUI(context);
    }

    private void init(Context context, AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.zoom_button);

        text = typedArray.getString(R.styleable.zoom_button_text);
        imgNormal = typedArray.getDrawable(R.styleable.zoom_button_imageview_normal_drawable);
        imgPressed = typedArray.getDrawable(R.styleable.zoom_button_imageview_pressed_drawable);

        if(text==null||imgNormal==null||imgPressed==null){
            Log.e("ZoomButton","typedArray is  have null !!!!");
        }

        typedArray.recycle();
    }

    private void addUI(Context context) {
        final ImageView img = new ImageView(context);
        img.setClickable(true);
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(308,439);
        lp.addRule(RelativeLayout.CENTER_VERTICAL);
        img.setLayoutParams(lp);
        img.setImageDrawable(imgNormal);
        addView(img);

        final TextView textView = new TextView(context);
        textView.setTextColor(Color.parseColor("#c0d8ff"));
        textView.setTextSize(40);
        textView.setGravity(Gravity.CENTER);
        textView.setText(text);
        final RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        lp2.topMargin=249;
        lp2.rightMargin= 15;
        textView.setLayoutParams(lp2);
        addView(textView);

        img.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                if (motionEvent.getAction()==MotionEvent.ACTION_DOWN){
                    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(328,439);
                    lp.addRule(RelativeLayout.CENTER_VERTICAL);
                    img.setLayoutParams(lp);
                    img.setImageDrawable(imgPressed);
                    lp2.rightMargin= 0;
                    textView.setLayoutParams(lp2);
                    textView.setTextSize(50);
                }else if(motionEvent.getAction()==MotionEvent.ACTION_UP){
                    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(308,439);
                    lp.addRule(RelativeLayout.CENTER_VERTICAL);
                    img.setLayoutParams(lp);
                    img.setImageDrawable(imgNormal);
                    lp2.rightMargin= 15;
                    textView.setLayoutParams(lp2);
                    textView.setTextSize(40);
                }
                return false;
            }
        });


        img.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                   if(l!=null){
                       view.setId(getId());   // 这里为什么传我的父类的id呢 就是因为我不希望父类被点击；当又要被看成父类被点击
                       l.onClick(view);
                   }
            }
        });
    }


}