创新源于模仿之五：做一个自己的QuickAction

 

public class ActionItem {  
  private Drawable icon;  
  private View.OnClickListener listener;  
  //以下代码省略   
}  

public class QuickAction {
    private static final String TAG="QuickAction";
    protected final View anchor; //弹出窗口的锚点
   
    private View root; //弹出窗口的根
    public final PopupWindow window; //弹出窗口
    protected final WindowManager windowManager; //只是用来计算屏幕大小的
   
    private ArrayList<ActionItem> actionList; //这里存放了很多的动作ActionItem
   
    private final Context mContext;
    private final LayoutInflater inflater;
    private final ImageView mArrowDown;
    private final ImageView mArrowUp;
    private ViewGroup mTrack;
    private final Animation mTrackAnim;//显示出来时的动画效果
    private Interpolator mAnimationInterpolator = new Interpolator(){
        @Override
        public float getInterpolation(float i) {
            // TODO Auto-generated method stub
            //这个插值很重要,弹簧效果哦
            final float inner = (i * 1.55f) - 1.1f;
                    return 1.2f - inner * inner;
        }};
    public QuickAction(View v) {
        this.anchor = v;
       
        this.mContext = v.getContext();
        this.inflater = LayoutInflater.from(this.mContext);
       
        this.window = new PopupWindow(mContext);       
        this.window.setTouchInterceptor(new View.OnTouchListener() {
           
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                // TODO Auto-generated method stub
                if (event.getAction() == MotionEvent.ACTION_OUTSIDE)
                      dismiss();
                return false;
            }
        });
       
        windowManager = (WindowManager)mContext.getSystemService("window");   
       
        this.actionList = new ArrayList<ActionItem>();
       
        this.root = (ViewGroup)this.inflater.inflate(R.layout.quickaction, null);
       
        this.mArrowDown =  (ImageView)this.root.findViewById(R.id.qa_arrow_down);
        this.mArrowUp = (ImageView)this.root.findViewById(R.id.qa_arrow_up);
       
        this.window.setContentView(this.root);
       
        //这里的动画anim文件及style，参考Contacts里的相应文件
        this.mTrackAnim = AnimationUtils.loadAnimation(this.mContext, R.anim.quickcontact);
        this.mTrackAnim.setInterpolator(mAnimationInterpolator);
       
        this.mTrack =  (ViewGroup)this.root.findViewById(R.id.qa_tracks);
       
      }
    public void dismiss() {
        this.window.dismiss();       
    }
   
    private void createActionList() {         
        int i = 1;
        for(ActionItem ai : this.actionList){
            Drawable icon = ai.getIcon();
            View.OnClickListener listener=ai.getListener();
            View v = getActionItem(icon,listener);
            v.setFocusable(true);
            v.setClickable(true);
            this.mTrack.addView(v,i);
            i++;
        }
       
    }
    private View getActionItem(Drawable icon, View.OnClickListener listener) {
        LinearLayout view = (LinearLayout)this.inflater.inflate(R.layout.action_item, null);
        ImageView ic = (ImageView)view.findViewById(R.id.ai_icon);
       
        if (icon != null){
            ic.setImageDrawable(icon);
            if( listener!=null)
                view.setOnClickListener(listener);
           
            view.setVisibility(View.VISIBLE);
        }
        else
            view.setVisibility(View.GONE);
       
        return view;       
    }
   
    public void addActionItem(ActionItem item) {
        this.actionList.add(item);
    }
    public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
        this.window.setOnDismissListener(listener);
    }
   
    protected void preShow() {
        if (this.root == null) throw new IllegalStateException("setContentView was not called with a view to display.");
        this.window.setBackgroundDrawable(new BitmapDrawable());
       
        this.window.setWidth(LayoutParams.FILL_PARENT);
        this.window.setHeight(LayoutParams.WRAP_CONTENT);
        this.window.setTouchable(true);
        this.window.setFocusable(true);
        this.window.setOutsideTouchable(true);
        this.window.setContentView(this.root);
       
        //这里的动画anim文件及style，参考Contacts里的相应文件
        this.window.setAnimationStyle(R.style.QuickContactAboveAnimation);
       
    }
   
    private void showArrow(int resId, int margin) {
        ImageView v1=this.mArrowDown;
        ImageView v2=this.mArrowUp;
       
        if (resId == R.id.qa_arrow_up){
            v1 = this.mArrowUp;
            v2= this.mArrowDown;
        }
       
        int w = v1.getMeasuredWidth()/2;
        v1.setVisibility(View.VISIBLE);
        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)v1.getLayoutParams();
        params.leftMargin=margin-w;
        v2.setVisibility(View.INVISIBLE);       
      }
      public void show() {
        preShow();
       
        int[] loc = new int[2];
        this.anchor.getLocationOnScreen(loc);
        int i = loc[0];
        int j = loc[1];
       
        int w = i + this.anchor.getWidth();
        int h = j + this.anchor.getHeight();
       
        Rect localRect = new Rect(i, j, w, h);
        this.root.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
        this.root.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED);
       
        int ww = this.root.getMeasuredWidth();
        int hh = this.root.getMeasuredHeight();
       
        int dw = this.windowManager.getDefaultDisplay().getWidth();
       
        int xx = ( dw- ww) / 2;
        int yy = localRect.top - hh + 10;
       
        boolean isArrowDown = true;
        if (hh > (localRect.top - 50)) {
          yy = localRect.bottom - 10;
          isArrowDown = false;
        }
       
        {
            int rid=isArrowDown?R.id.qa_arrow_down:R.id.qa_arrow_up;
            showArrow(rid, localRect.centerX());
           
            createActionList();
           
            this.window.showAtLocation(this.anchor, Gravity.NO_GRAVITY, xx, yy);
            //showDropDown();
           
            this.mTrack.startAnimation(this.mTrackAnim);
         
        }
      }
}