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！