android图片类型之间的互转

 
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！