Android 常用API使用 之 Base64

Base64編碼文件爲字符串

public static String encodeBase64File(File file) throws Exception {
    FileInputStream inputFile = new FileInputStream(file);
    byte[] buffer = new byte[(int) file.length()];
    inputFile.read(buffer);
    inputFile.close();
    return Base64.encodeToString(buffer, Base64.DEFAULT);
}

Base64編碼Bitmap爲字符串

public String bitmapToString(Bitmap bitmap) {
    ByteArrayOutputStream bitmapStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, bitmapStream);
    byte[] bytes = bitmapStream.toByteArray();
    return Base64.encodeToString(bytes, Base64.DEFAULT);
}