IndicatorLayout.java 文件源码

public IndicatorLayout(Context context, PullToRefreshBase.Mode mode) {
    super(context);
    mArrowImageView = new ImageView(context);

    Drawable arrowD = getResources().getDrawable(R.drawable.indicator_arrow);
    mArrowImageView.setImageDrawable(arrowD);

    final int padding = getResources().getDimensionPixelSize(R.dimen.indicator_internal_padding);
    mArrowImageView.setPadding(padding, padding, padding, padding);
    addView(mArrowImageView);

    int inAnimResId, outAnimResId;
    switch (mode) {
        case PULL_FROM_END:
            inAnimResId = R.anim.slide_in_from_bottom;
            outAnimResId = R.anim.slide_out_to_bottom;
            setBackgroundResource(R.drawable.indicator_bg_bottom);

            // Rotate Arrow so it's pointing the correct way
            mArrowImageView.setScaleType(ScaleType.MATRIX);
            Matrix matrix = new Matrix();
            matrix.setRotate(180f, arrowD.getIntrinsicWidth() / 2f, arrowD.getIntrinsicHeight() / 2f);
            mArrowImageView.setImageMatrix(matrix);
            break;
        default:
        case PULL_FROM_START:
            inAnimResId = R.anim.slide_in_from_top;
            outAnimResId = R.anim.slide_out_to_top;
            setBackgroundResource(R.drawable.indicator_bg_top);
            break;
    }

    mInAnim = AnimationUtils.loadAnimation(context, inAnimResId);
    mInAnim.setAnimationListener(this);

    mOutAnim = AnimationUtils.loadAnimation(context, outAnimResId);
    mOutAnim.setAnimationListener(this);

    final Interpolator interpolator = new LinearInterpolator();
    mRotateAnimation = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
            0.5f);
    mRotateAnimation.setInterpolator(interpolator);
    mRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
    mRotateAnimation.setFillAfter(true);

    mResetRotateAnimation = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF, 0.5f,
            Animation.RELATIVE_TO_SELF, 0.5f);
    mResetRotateAnimation.setInterpolator(interpolator);
    mResetRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
    mResetRotateAnimation.setFillAfter(true);

}