TargetLayout.java 文件源码

private void init(Context context, AttributeSet attrs) {

        setWillNotDraw(false);
        if (attrs != null) {
            TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TargetLayout);
            centerPercent = ta.getFloat(R.styleable.TargetLayout_center_percent, DEFAULT_CENTER_PERCENT);
            stepPercent = ta.getFloat(R.styleable.TargetLayout_step_percent, DEFAULT_STEP_PERCENT);
            maxNumberOfLevels = ta.getInteger(R.styleable.TargetLayout_max_number_of_levels, DEFAULT_MAX_NUMBER_OF_LEVELS);
            try {
                levelListDrawable = (LevelListDrawable) ta.getDrawable(R.styleable.TargetLayout_levelDrawable);
            } catch (ClassCastException e) {
                throw new IllegalArgumentException("a LevelListDrawable must be passed");
            }
            updateTarget();
            ta.recycle();
        }

        ScaleListener scaleListener = new ScaleListener();
        scaleGestureDetector = new ScaleGestureDetector(context, scaleListener);
    }