Activity、View 转Bitmap、Image

Activity、View 转Bitmap，拿走，直接用，不谢。

注意：背景需要自己处理。

/**
 * author: vector.huang
 * date: 2019/04/15 14:19
 */
public class View2BitmapUtil {

    /**
     * 指定Activity的Bitmap
     */
    public static Bitmap getBitmap(Activity activity, boolean needStatusBar) {

        //获取需要显示的View
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();


        // 获取屏幕长和高
        Point size = new Point();
        activity.getWindowManager().getDefaultDisplay().getSize(size);

        int y = 0;
        int height = size.y;
        if (!needStatusBar) {
            //状态栏
            //获取状态栏高度
            Rect frame = new Rect();
            activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
            y = frame.top;
            height -= frame.top;
        }

        Bitmap b = Bitmap.createBitmap(bitmap, 0, y, size.x, height);
        view.destroyDrawingCache();

        return b;
    }

    /**
     * 已经显示的view转bitmap，获取整个View 的内容
     */
    public static Bitmap getAllBitmap(View view) {

        //布局，为了呈现整个View，所以高度设置尽量大，不然可能只看到一半
        //假装父View高，整个整个View 就会全部显示了
        int width = view.getWidth();
        int height = view.getHeight();

        view.layout(0, 0, width, 10000_0000);

        //计算
        int measuredWidth = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(10000_0000, View.MeasureSpec.AT_MOST);
        view.measure(measuredWidth, measuredHeight);

        //再次布局，使其刚刚好
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        //转bitmap
        view.setDrawingCacheEnabled(true);
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
        Bitmap bitmap = getBitmap(view);

        //复原
        view.layout(0, 0, width, height);
        view.measure(width, height);

        return bitmap;
    }


    /**
     * 已经显示的view转bitmap，获取可见部分
     */
    public static Bitmap getBitmap(View v) {
        int w = v.getWidth();
        int h = v.getHeight();

        Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bmp);

        v.layout(0, 0, w, h);
        v.draw(c);
        return bmp;
    }

    /**
     * 可以完整地获取布局文件的Bitmap
     */
    public static Bitmap getBitmap(Activity activity, @LayoutRes int layoutRes, int width,
                                   OnMeasuredListener onMeasuredListener) {

        //获取View
        View view = LayoutInflater.from(activity).inflate(layoutRes, null);

        //布局，为了呈现整个View，所以高度设置尽量大，不然可能只看到一半
        //假装父View高，整个整个View 就会全部显示了
        view.layout(0, 0, width, 10000_0000);

        //计算
        int measuredWidth = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(10000_0000, View.MeasureSpec.AT_MOST);
        view.measure(measuredWidth, measuredHeight);

        //再次布局，使其刚刚好
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        //这里可以填充内容
        if (onMeasuredListener != null) {
            onMeasuredListener.onMeasured(view);
        }

        //转bitmap
        view.setDrawingCacheEnabled(true);
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
        return getBitmap(view);

    }

    public interface OnMeasuredListener {
        void onMeasured(View v);
    }
}