Android 获取View宽高

最新推荐文章于 2024-08-12 11:42:49 发布

原创最新推荐文章于 2024-08-12 11:42:49 发布 · 189 阅读

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本文探讨了在View初始状态为GONE时，如何正确获取其宽度和高度。通过在View变为可见时利用onVisibilityChanged方法和ViewTreeObserver的onGlobalLayoutListener，确保View尺寸的准确获取。

一般情况：

View's getWidth() and getHeight() returns 0

View初始状态为GONE的情况

    private int mMeasuredHeight;
    private int mMeasuredWidth;

    private boolean firstVisible = true;

    @Override
    protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
        super.onVisibilityChanged(changedView, visibility);
        if (visibility == View.VISIBLE) {//可见状态
            if (firstVisible) {
                mSeekBar.getViewTreeObserver().addOnGlobalLayoutListener(new         
                                               ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        mMeasuredWidth = mSeekBar.getMeasuredWidth();
                        mMeasuredHeight = mSeekBar.getMeasuredHeight();
                        Log.e("", "onGlobalLayout " + mMeasuredWidth + " " + 
                                                                         mMeasuredHeight);
                        mSeekBar.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                    }
                });
                firstVisible = false;
            }
        }
    }