android 处理图片资源

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) {  
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();  
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！