android图片资源转换

android在处理一写图片资源的时候，会进行一些类型的转换，现在有空整理一下：

1、Drawable → Bitmap

Java代码

1. public static Bitmap drawableToBitmap(Drawable drawable) {
2.
3. Bitmap bitmap = Bitmap
4. .createBitmap(
5. drawable.getIntrinsicWidth(),
6. drawable.getIntrinsicHeight(),
7. drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
8. : Bitmap.Config.RGB_565);
9. Canvas canvas = new Canvas(bitmap);
10. //canvas.setBitmap(bitmap);
11. drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
12. drawable.draw(canvas);
13. return bitmap;
14. }

public 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;
}

2、从资源中获取Bitmap

Java代码

1. Resources res=getResources();
2.
3. Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);

Resources res=getResources();

Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);

3、Bitmap → byte[]

Java代码

1. private byte[] Bitmap2Bytes(Bitmap bm){
2. ByteArrayOutputStream baos = new ByteArrayOutputStream();
3. bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
4. return baos.toByteArray();
5. }

private byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); }

4、 byte[] → Bitmap

Java代码

1. private Bitmap Bytes2Bimap(byte[] b){
2. if(b.length!=0){
3. return BitmapFactory.decodeByteArray(b, 0, b.length);
4. }
5. else {
6. return null;
7. }
8. }

private Bitmap Bytes2Bimap(byte[] b){
if(b.length!=0){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
else {
return null;
}
}

以上是我在实践中遇到的一些转换，以后遇到类似的就不用到处找了，希望对大家也有一点用处！

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