Flutter高仿微信系列共59篇，从Flutter客户端、Kotlin客户端、Web服务器、数据库表结构、Xmpp即时通讯服务器、视频通话服务器、腾讯云服务器全面讲解。

 详情请查看

效果图：

详情请参考 Flutter高仿微信-第29篇-单聊 ， 这里只是提取图片实现的部分代码。

实现代码：

//打开相册权限
void _openAblumPermission() async {
  bool isPhotosGranted = await Permission.photos.isGranted;
  bool isPhotosDenied = await Permission.photos.isDenied;
  if(isPhotosGranted){
    _openAblum();
  } else {
    if(isPhotosDenied){
      _openAblum();
    } else {
      //跳转到设置页面提示
      _showPhotosConfirmationAlert(context);
    }
  }
}

// 为正常拍摄，请前往设备中的【设置】> 【隐私】> 【相机】中允许无他相机使用
_showPhotosConfirmationAlert(BuildContext context) {
  showPlatformDialog(
    context: context,
    builder: (_) => BasicDialogAlert(
      title: Text("无法使用相册"),
      content: Text("为编辑照片，请前往设备中的【设置】> 【隐私】> 【照片】中允许${AppManager.getInstance().appName}使用"),
      actions: <Widget>[
        BasicDialogAction(
          title: Text("知道了"),
          onPressed: () {
            Navigator.pop(context);
          },
        ),
        BasicDialogAction(
          title: Text("去设置"),
          onPressed: () {
            // 跳转到系统设置页
            AppSettings.openAppSettings();
          },
        ),
      ],
    ),
  );
}

//打开相册
void _openAblum() {
  List<AssetEntity> selectedAssets = [];
  AssetPicker.pickAssets(
    context,
    pickerConfig: AssetPickerConfig(
      maxAssets: 1,
      selectedAssets: selectedAssets,
    ),
  ).then((imageList) {
    if(imageList == null){
      return;
    }
    imageList as List<AssetEntity>;
    for(int i = 0; i < imageList.length; i++){
      AssetEntity ae = imageList[i];
      ae.file.then((file) async {
        String resultFilePath = file?.path??"";
        _processVideoAndPicture(resultFilePath);
      });
    }
  });
}

//处理图片和小视频(相册、拍照)
void _processVideoAndPicture(String resultFilePath) async {

  if(resultFilePath == null || "" == resultFilePath){
    return;
  }

  String messageId = UUID.getUUID();

  if(CommonUtils.isImage(resultFilePath)){
    //压缩图片完成再发送
    String compressImagePath = await CompressImageUtils.compressFile(fileName: resultFilePath);
    widget.sendMedialCallback(CommonUtils.CHAT_CONTENT_TYPE_IMG, compressImagePath,0 ,messageId);
    widget.refreshMediaCallback(CommonUtils.CHAT_CONTENT_TYPE_IMG, compressImagePath, "",0, messageId);
  } 

}

接收到消息：

String serverImagePath = CommonUtils.BASE_URL_UPLOAD + content;
String localImagePath = await FileUtils.getBaseFile("${DateUtil.getNowDateMs()}.jpg");
//先下载图片
await DownloadUtils.getInstance().downloadFile(serverImagePath, localImagePath);
chatBean.imgPath = serverImagePath;
chatBean.imgPathLocal = localImagePath;

//通知栏提示
NotificationUtils.getInstance().showNotification(chatBean);
//插入本地数据库
ChatRepository.getInstance().insertChat(chatBean);
//EventBus刷新页面
eventBus.emit(chatBean);