android 放大平铺图片

// 画一个平铺效果的图
public Bitmap createRepeater(int width, Bitmap src) {
int count = (width + src.getWidth() - 1) / src.getWidth();

Bitmap bitmap = Bitmap.createBitmap(width, src.getHeight(),
Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
for (int idx = 0; idx < count; ++idx) {
canvas.drawBitmap(src, idx * src.getWidth(), 0, null);
}
return bitmap;
}

public Drawable getBottomTitle54(Context context) {
Bitmap bitmapT = BitmapFactory.decodeResource(context.getResources(),
R.drawable.home_page_bottom);

int width = bitmapT.getWidth();
int height = bitmapT.getHeight();
// 设置想要的大小
int newWidth = Utilities.getInstance().dip2px(context, 5);
int newHeight = Utilities.getInstance().dip2px(context, 54);
// 计算缩放比例
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// 得到新的图片
Bitmap bitmap = Bitmap.createBitmap(bitmapT, 0, 0, width, height,
matrix, true);

DisplayMetrics dm = context.getResources().getDisplayMetrics();
int w_screen = dm.widthPixels;
Bitmap bitmap2 = createRepeater(w_screen, bitmap);
return new BitmapDrawable(context.getResources(), bitmap2);
}