关于bitmap的使用

最新推荐文章于 2024-08-30 19:35:28 发布

SovereignJ

最新推荐文章于 2024-08-30 19:35:28 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/SovereignJ/article/details/56495273

本文介绍了如何在Android中实现Bitmap与byte数组之间的相互转换，并提供了Bitmap与Drawable互相转换的方法。

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1.将bitmap转化为byte数组

ByteArrayOutputStream output = new ByteArrayOutputStream();//初始化一个流对象

bitmap.compress(CompressFormat.PNG, 100, output);//bitmap是Bitmap的对象把bitmap100%高质量压缩到 output对象里

byte[] result = output.toByteArray();

2.将byte数组转化为bitmap对象

 Resources res = getResources();

 Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.icon);//先获取到Bitmap资源

 byte[] result = getIntent.getByteArrayExtra(bitmap);

 Bitmap bitmap = BitmapFactory.decodeByteArray(b,0,b.length);


3.将bitmap转化为Drawable
 Resources res = getResources();
 Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.icon);//先获取到Bitmap资源
 Drawable drawable = new BitmapDrawable(bitmap);


4.Drawable → Bitmappublic static Bitmap drawableToBitmap(Drawable drawable) {
       
        Bitmap bitmap = Bitmap.createBitmap(
                                        drawable.getIntrinsicWidth(),
                                        drawable.getIntrinsicHeight(),
                                        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                                                        : Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(bitmap);
        //canvas.setBitmap(bitmap);
        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        drawable.draw(canvas);
        return bitmap;
}