Drawable、Bitmap、byte[]之间的转换 Bitmap转换成InputStream。

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

 

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

 

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[]

 

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

 
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;
		    }
	  }

Bitmap转换成InputStream。

private InputStream  Bitmap2IS(Bitmap bm){  
    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);  
        InputStream sbs = new ByteArrayInputStream(baos.toByteArray());    
        return sbs;  
    }  



 

 

 

你可能感兴趣的:(android)