android.widget.LinearLayout#draw ( )源码实例Demo

public Bitmap getBitmapFromView(String title, int dotBg) {

        LinearLayout llmarker = (LinearLayout) findViewById(R.id.ll_marker);
        TextView markerImageView = (TextView) findViewById(R.id.tv_title);
        markerImageView.setText(title);
        View dot = (View) findViewById(R.id.dot_marker);
        dot.setBackgroundResource(dotBg);

        llmarker.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        Bitmap bitmap = Bitmap.createBitmap(llmarker.getMeasuredWidth(), llmarker.getMeasuredHeight(),
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        llmarker.layout(0, 0, llmarker.getMeasuredWidth(), llmarker.getMeasuredHeight());
        llmarker.draw(canvas);
        return bitmap;
    }
 

public Bitmap getBitmapFromView(String title, int dotBg) {

        LinearLayout llmarker = (LinearLayout) findViewById(R.id.ll_marker);
        TextView markerImageView = (TextView) findViewById(R.id.tv_title);
        markerImageView.setText(title);
        View dot = (View) findViewById(R.id.dot_marker);
        dot.setBackgroundResource(dotBg);

        llmarker.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        Bitmap bitmap = Bitmap.createBitmap(llmarker.getMeasuredWidth(), llmarker.getMeasuredHeight(),
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        llmarker.layout(0, 0, llmarker.getMeasuredWidth(), llmarker.getMeasuredHeight());
        llmarker.draw(canvas);
        return bitmap;
    }
 

public void write(FormulaListView formulaListView, Bitmap.CompressFormat format) throws Exception
{
    final LinearLayout f = formulaListView.getList();
    Bitmap bitmap = null;
    try
    {
        bitmap = Bitmap.createBitmap(f.getMeasuredWidth(), f.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
        final Canvas canvas = new Canvas(bitmap);
        f.setBackgroundColor(CompatUtils.getThemeColorAttr(f.getContext(), android.R.attr.windowBackground));
        f.draw(canvas);
    }
    catch (OutOfMemoryError e)
    {
        throw new Exception(e.getLocalizedMessage());
    }
    finally
    {
        f.setBackgroundResource(android.R.color.transparent);
    }
    bitmap.compress(format, 100, stream);
    stream.flush();
}
 

/**
 * 截取LinearLayout
 **/
public static Bitmap getLinearLayoutBitmap(LinearLayout linearLayout) {
    int h = 0;
    Bitmap bitmap;
    for (int i = 0; i < linearLayout.getChildCount(); i++) {
        h += linearLayout.getChildAt(i).getHeight();
    }
    // 创建对应大小的bitmap
    bitmap = Bitmap.createBitmap(linearLayout.getWidth(), h,
            Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bitmap);
    linearLayout.draw(canvas);
    return bitmap;
}