Android 中將 "base64圖片" 解碼爲".png"圖片

android 中將 "base64圖片" 解碼爲".png"圖片

參考：

Convert base64 image data to an image file(.png) and save it to Local file system

方法一

String base64Img = "";
// 若包含"data:image/jpeg;base64,"前綴，只取後邊的部分
if (base64Img.contains(",")) {
    String[] base64ImgArray = base64Img.split(",");
    if (base64ImgArray.length == 2) {
        base64Img = base64ImgArray[1];
    }
}
// 解碼
try {
    byte[] decodedString = Base64.decode(base64Img, Base64.DEFAULT);
    Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
    if (mBitmapCreateListener != null) {
        mBitmapCreateListener.onBitmapCreate(decodedByte);
    }
} catch (Exception e) {
    e.printStackTrace();
    // 回調生成圖片失敗
    if (mBitmapCreateListener != null) {
        mBitmapCreateListener.onBitmapCreate(null);
    }
}

方法二

FileOutputStream fos = null;
try {
    if (base64ImageData != null) {
       fos = context.openFileOutput("imageName.png", Context.MODE_PRIVATE);
       byte[] decodedString = android.util.Base64.decode(base64ImageData, android.util.Base64.DEFAULT);
       fos.write(decodedString);                        
       fos.flush();
       fos.close();             
    }

} catch (Exception e) {

} finally {
    if (fos != null) {
        fos = null;
    }
}