---

layout: post title: Android中Bitmap、Drawable、bytes数组之间相互转换 category: Android tags: Android keywords: Android，bitmap，drawable，bitmapdrawable，byte数组 description: Android中Bitmap、Drawable、bytes数组之间相互转换

---

package com.uperone.resources;

import java.io.ByteArrayOutputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class BitmapUtils {
    private BitmapUtils( ){

    }

    /**
     * bitmap -> bytes
     * 
     * */
    public static byte[] bitmap2Bytes( Bitmap bitmap ){
        if( null == bitmap ){
            return null;
        }

        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream( );    
        bitmap.compress( Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream );

        return byteArrayOutputStream.toByteArray( );
    }

    /**
     * bytes -> bitmap
     * 
     * */
    public static Bitmap bytes2Bitmap( byte[] bytes ){
        if( null == bytes || bytes.length == 0 ){
            return null;
        }

        return BitmapFactory.decodeByteArray( bytes, 0, bytes.length ); 
    }

    /**
     * bitmap -> drawable
     * 
     * */
    public static Drawable bitmap2Drawable( Context context, Bitmap bitmap ){
        if( null == context || null == bitmap ){
            return null;
        }

        return new BitmapDrawable( context.getResources( ), bitmap );  
    }

    /**
     * drawable -> bitmap
     * 
     * */
    public static Bitmap drawable2Bitmap( Drawable drawable ){
        if( null == drawable ){
            return null;
        }

        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 );  
        drawable.setBounds( 0, 0, drawable.getIntrinsicWidth( ), drawable.getIntrinsicHeight( ) );  
        drawable.draw( canvas );

        return bitmap;  
    }
}