Question

我按照tutorial进行拍照并保存到设备存储中，但是当我执行它时，它会出现异常

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",

    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

如何解决这个问题？

java.io.IOException: Permission denied 
 on line:

File image = File.createTempFile(imageFileName, ".jpg", storageDir);

- 编辑 -
这是我的清单

private File createImageFile() throws IOException
{
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "Camera");
    File image = File.createTempFile(imageFileName, ".jpg", storageDir);

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;
}

Answer 1

与Android Documentation一样，您需要写入外部存储空间，您必须在WRITE_EXTERNAL_STORAGE中申请manifest file权限：

如果您使用API 23（Marshmallow）及以上版本，则需要Requesting Permissions at Run Time，因为它是Dangerous Permission。

Answer 2

在清单文件中添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

如果是above API 23 Storage permission will do like this

Answer 3

将权限放在清单文件中：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

并在try catch块中添加createTempFile代码：

    File storageDir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File file = null;
    try {
        file = File.createTempFile(timeStamp, ".jpg", storageDir);
    } catch (IOException e) {
        e.printStackTrace();
    }
    mCurrentPhotoPath = String.valueOf(Uri.fromFile(file));
    return file;

Answer 4

如果您的目标 api 级别 >=29 或者您使用的是 android 10，那么请在应用程序标签的应用清单文件中添加以下行

android:requestLegacyExternalStorage="true"

Answer 5

将此标记写入项目的清单文件中，并在运行之前通过Android手机中的设置授予您的应用权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

java.io.IOException：Permission denied无法创建文件

5 个答案: