java Base64&Image

Posted 2021-05-07

// 需要去掉字符串的"data:image/png;base64,"
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;
}

// 保存并转码
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();
}

// String与Bitmap互转
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();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, bStream);
    byte[] bytes = bStream.toByteArray();
    string = Base64.encodeToString(bytes, Base64.DEFAULT);
    return string;
}