场景
项目中有个功能是显示微信付款码,为了节省服务器存储,将图片以Base64的形式存储,客户端接收到后将Base64转换成图片并加载,但是不要存放大图,在网上看到的大多都是使用了一个java库( import sun.misc.BASE64Encoder;import sun.misc.BASE64Decoder;
),其实Android自带有转换的类(import android.util.Base64;
)
实现
public static Bitmap stringToBitmap(String string) {Bitmap bitmap = null;try {byte[] bitmapArray = Base64.decode(string.split(",")[1], Base64.DEFAULT);bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);} catch (Exception e) {e.printStackTrace();}return bitmap;}
注意:
需要去掉字符串的
data:image/png;base64,
转码并保存成文件
public static void decoderBase64File(String base64Code,String savePath) throws Exception {//byte[] buffer = new BASE64Decoder().decodeBuffer(base64Code);byte[] buffer =Base64.decode(base64Code, Base64.DEFAULT);FileOutputStream out = new FileOutputStream(savePath);out.write(buffer);out.close();}
转码成bitmap
public Bitmap stringtoBitmap(String string) {//将字符串转换成Bitmap类型Bitmap bitmap = null;try {byte[] bitmapArray;bitmapArray = Base64.decode(string, Base64.DEFAULT);bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);} catch (Exception e) {e.printStackTrace();}return bitmap;}public String bitmaptoString(Bitmap bitmap) {//将Bitmap转换成字符串String string = null;ByteArrayOutputStream bStream = new ByteArrayOutputStream();press(pressFormat.PNG, 100, bStream);byte[] bytes = bStream.toByteArray();string = Base64.encodeToString(bytes, Base64.DEFAULT);return string;}
参考文章:
+ Android Base64字符串转换成图片
+ 安卓中图片和Base64编码字符集的相互转换
+ android bitmap和base64之间的转换