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; 
} 
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、從資源中獲取Bitmap

Java代碼如下：

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

3、Bitmap → byte[]

Java代碼如下：

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

4、 byte[] → Bitmap

Java代碼如下：

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

以上是我在實(shí)踐中遇到的一些轉(zhuǎn)換，以后遇到類(lèi)似的就不用到處找了。

希望本文所述對(duì)大家的Android程序設(shè)計(jì)有所幫助。

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