Android Drawable 和String 相互转化

在我们经常应用开发中，经常用到将drawable和string相互转化。注意这情况最好用于小图片入icon等。

[java] view plain copy

public synchronized Drawable byteToDrawable(String icon) {

byte[] img=Base64.decode(icon.getBytes(), Base64.DEFAULT);

Bitmap bitmap;

if (img != null) {

bitmap = BitmapFactory.decodeByteArray(img,0, img.length);

@SuppressWarnings("deprecation")

Drawable drawable = new BitmapDrawable(bitmap);

return drawable;

}

return null;

}

public synchronized String drawableToByte(Drawable drawable) {

if (drawable != null) {

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);

drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),

drawable.getIntrinsicHeight());

drawable.draw(canvas);

int size = bitmap.getWidth() * bitmap.getHeight() * 4;

// 创建一个字节数组输出流,流的大小为size

ByteArrayOutputStream baos = new ByteArrayOutputStream(size);

// 设置位图的压缩格式，质量为100%，并放入字节数组输出流中

bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);

// 将字节数组输出流转化为字节数组byte[]

byte[] imagedata = baos.toByteArray();

String icon= Base64.encodeToString(imagedata, Base64.DEFAULT);

return icon;

}

return null;

}