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/** * 下拉过程中不断调用此方法。第一阶段从小变大的小人头动画,和第二阶段翻跟头动画都在这里设置 */ @Override public void onPullingDown(float percent, int offset, int headerHeight, int extendHeight) { Logger.d("percent: " + percent); // 下拉的百分比小于100%时,不断调用 setScale 方法改变图片大小 if (percent < 1) { mImage.setScaleX(percent); mImage.setScaleY(percent); //是否执行过翻跟头动画的标记 if (hasSetPullDownAnim) { hasSetPullDownAnim = false; } } //当下拉的高度达到Header高度100%时,开始加载正在下拉的初始动画,即翻跟头 if (percent >= 1.0) { //快速下拉 percent可能会直接从 0.5直接到1,而不会一点点变大,从而导致mImage的大小还是0.5,所以应该在这设置view的本身大小 mImage.setScaleX(1); mImage.setScaleY(1); //因为这个方法是不停调用的,防止重复 if (!hasSetPullDownAnim) { mImage.setImageResource(R.drawable.anim_pull_end); pullDownAnim = (AnimationDrawable) mImage.getDrawable(); pullDownAnim.start(); hasSetPullDownAnim = true; } } }
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