【问题标题】:Image from Gallery in Android 6(Marshmallow)图片来自 Android 6 中的图库(棉花糖)
【发布时间】:2016-02-10 14:52:18
【问题描述】:

在我的应用程序中,我试图从厨房中挑选图像,以便将该图像传递给服务器。

代码在 Android 5 及更低版本上运行良好,但对于 Nexus 5 上的 Android 6,我无法获取图像信息。 我得到的日志跟踪

注意:代码在 Android 5 及以下版本上运行良好

11-06 12:27:43.736: W/System.err(31678): java.lang.SecurityException: Permission Denial: reading com.google.android.apps.photos.contentprovider.MediaContentProvider uri content://com.google.android.apps.photos.contentprovider/0/1/content%3A//media/external/images/media/19138/ACTUAL/94710853 from pid=31678, uid=10111 requires the provider be exported, or grantUriPermission()
11-06 12:27:43.757: W/System.err(31678): 
at android.os.Parcel.readException(Parcel.java:1599)
11-06 12:27:43.757: W/System.err(31678): 
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
11-06 12:27:43.757: W/System.err(31678): 
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
11-06 12:27:43.757: W/System.err(31678): 
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
11-06 12:27:43.757: W/System.err(31678): 
at android.content.ContentResolver.query(ContentResolver.java:491)
11-06 12:27:43.757: W/System.err(31678): 
at android.content.ContentResolver.query(ContentResolver.java:434)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.ContentFilesystem.openCursorForURL(ContentFilesystem.java:258)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.ContentFilesystem.getFileMetadataForLocalURL(ContentFilesystem.java:169)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.FileUtils.getFileMetadata(FileUtils.java:822)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.FileUtils.access$500(FileUtils.java:52)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.FileUtils$15.run(FileUtils.java:394)
11-06 12:27:43.758: W/System.err(31678): 
at org.apache.cordova.file.FileUtils$25.run(FileUtils.java:551)
11-06 12:27:43.758: W/System.err(31678): 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
11-06 12:27:43.758: W/System.err(31678): 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
11-06 12:27:43.758: W/System.err(31678): 
at java.lang.Thread.run(Thread.java:818)

【问题讨论】:

  • 我猜你应该尝试在相同的上下文中解码图像,而不将 uri 传递到另一个上下文并在那里解码图像(如 startActivity)。

标签: android android-gallery android-6.0-marshmallow


【解决方案1】:

这样做... on Button 点击​​检查 SDK 版本

 if (Build.VERSION.SDK_INT >= 23){
    // Here, thisActivity is the current activity
                        if (ContextCompat.checkSelfPermission(MainActivity.this,
                                Manifest.permission.READ_EXTERNAL_STORAGE)
                                != PackageManager.PERMISSION_GRANTED) {

                            // Should we show an explanation?
                            if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this,
                                    Manifest.permission.READ_EXTERNAL_STORAGE)) {

                                // Show an expanation to the user *asynchronously* -- don't block
                                // this thread waiting for the user's response! After the user
                                // sees the explanation, try again to request the permission.

                            } else {

                                // No explanation needed, we can request the permission.

                                ActivityCompat.requestPermissions(MainActivity.this,
                                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                                        MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);

                                // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
                                // app-defined int constant. The callback method gets the
                                // result of the request.
                            }
                        }else{
                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                                    MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                        }
                    }else {

                        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
                        photoPickerIntent.setType("image/*");
                        startActivityForResult(photoPickerIntent, SELECT_PHOTO);
                    }

然后在 Override 方法 onRequestPermissionsResult 中写下这段代码:

 case MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.
                    Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
                    photoPickerIntent.setType("image/*");
                    startActivityForResult(photoPickerIntent, SELECT_PHOTO);
                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
                return;
            }

之后

@Override
    protected void onActivityResult(int reqCode, int resultCode, Intent data) {
        super.onActivityResult(reqCode, resultCode, data);

        switch (reqCode) {
 case SELECT_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        final Uri imageUri = data.getData();
                        final InputStream imageStream = getContentResolver().openInputStream(imageUri);
                        final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
                        contactimage.setImageBitmap(selectedImage);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }

                }

【讨论】:

  • MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE 是什么,我在哪里初始化它??
  • 它是一个静态 int 值,为它分配任何 int 值,但该值不应用于任何其他请求。例如,如果相机使用值 1,那么您可以使用除 1 之外的任何整数值..
【解决方案2】:

我相信您需要在运行时向用户请求权限(这是从 api 22 到 23 最明显的变化之一)。

你可以试试这个sn-p,提取自Android Developers permission page

if (Build.VERSION.SDK_INT >= 23){    
// Here, thisActivity is the current activity
    if (ContextCompat.checkSelfPermission(thisActivity,
                    Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
                Manifest.permission.READ_EXTERNAL_STORAGE)) {

            // Show an expanation to the user *asynchronously* -- don't block
            // this thread waiting for the user's response! After the user
            // sees the explanation, try again to request the permission.

        } else {

            // No explanation needed, we can request the permission.

            ActivityCompat.requestPermissions(thisActivity,
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);

            // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
            // app-defined int constant. The callback method gets the
            // result of the request.
        }
    }
  }

如果有帮助,请告诉我。

【讨论】:

    【解决方案3】:

    为了从 Marshmallow 中的图库中获取图像,您需要在运行时授予 READ_EXTERNAL_STORAGE 权限。 Android 版本 M 改变了授予应用程序权限的方式。

    在 Marshmallow 之前,所有必需的权限都是在安装时一次性授予的。但在 Marshmallow 中,只有在需要该权限时才会向用户请求权限,并且用户必须允许或拒绝该权限。

    以下两个链接将为您提供更多帮助。链接 1 来自 Android 的官方文档,链接 2 是一个博客,它通过一个工作示例解释了这个问题。

    链接1:http://developer.android.com/training/permissions/requesting.html

    链接2:http://inthecheesefactory.com/blog/things-you-need-to-know-about-android-m-permission-developer-edition/en

    【讨论】:

      【解决方案4】:

      我遇到了同样的问题。使用

      从图库中选择图像后,图像显示在 Imageview 中
      Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
      startActivityForResult(galleryIntent, videoIdentifier);
      

      并从 URI 解码位图图像

      但保存 URI 以供将来使用并重新打开应用程序并重新使用保存的 URI 不起作用。无法从 URI 解码位图。

      我通过从 URI 路径中提取原始内容 uri 解决了这个问题

      public String RemoveUnwantedString(String pathUri){
          //pathUri = "content://com.google.android.apps.photos.contentprovider/-1/2/content://media/external/video/media/5213/ORIGINAL/NONE/2106970034"
          String[] d1 = pathUri.split("content://");
          for (String item1:d1) {
              if (item1.contains("media/")) {
                  String[] d2 = item1.split("/ORIGINAL/");
                  for (String item2:d2) {
                      if (item2.contains("media/")) {
                          pathUri = "content://" + item2;
                          break;
                      }
                  }
                  break;
              }
          }
          //pathUri = "content://media/external/video/media/5213"
          return pathUri;
      }
      

      【讨论】:

        【解决方案5】:

        试试这个

        这是我用其他示例创建的简单方法

        1. 在需要的地方调用 CHECKGALLERYPERMISSION() 方法并将代码粘贴到方法中

           private void CHECKGALLERYPERMISSION()
           {
              int MY_READ_PERMISSION_REQUEST_CODE =1 ;
              int PICK_IMAGE_REQUEST = 2;
              if (ContextCompat.checkSelfPermission(YourActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED)
              {
                  Intent intent = new Intent();
                  intent.setType("image/*");
                  intent.setAction(Intent.ACTION_GET_CONTENT);
                  startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
              }
              else
              {
                  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
                  {
                      requestPermissions(
                              new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE},
                              MY_READ_PERMISSION_REQUEST_CODE);
                  }
                  else
                  {
                  }
              }
            }
            @Override
            public void onRequestPermissionsResult(int requestCode, String[] 
            permissions, int[] grantResults) {
             if (requestCode == MY_READ_PERMISSION_REQUEST_CODE
                  && grantResults[0] == PackageManager.PERMISSION_GRANTED)
             {
              Intent intent = new Intent();
              intent.setType("image/*");
              intent.setAction(Intent.ACTION_GET_CONTENT);
              startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
          }
             }
            @Override
             public void onActivityResult(int requestCode, int resultCode, Intent data)
            {
          super.onActivityResult(requestCode, resultCode, data);
          if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null)
          {
              Uri uri = data.getData();
              try
              {
                  Bitmap bitmap = MediaStore.Images.Media.getBitmap(YourActivity.this.getContentResolver(), uri);
                  imageview.setImageBitmap(bitmap);
              }
              catch (IOException e)
              {
                  e.printStackTrace();
              }
          }
            }
          

        注意

        1. 在片段中使用 getactivity() 而不是 activity.this
        2. 如果 android.Manifest.permission.READ_EXTERNAL_STORAGE 不起作用,请在所有地方将其更改为 Manifest.permission.READ_EXTERNAL_STORAGE

        【讨论】:

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