假设在SD卡目录中有一个图像文件夹仅用于图像。

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// tells your intent to get the contents
// opens the URI for your image directory on your sdcard
intent.setType("file:///sdcard/image/*"); 
startActivityForResult(intent, 1);

然后，您可以决定如何处理活动中的内容。

这是一个检索图像路径名称的示例，用您的代码进行测试，以确保您可以处理返回的结果。您可以根据需要更改代码以更好地满足您的需求。

protected final void onActivityResult(final int requestCode, final int
                     resultCode, final Intent i) {
    super.onActivityResult(requestCode, resultCode, i);

  // this matches the request code in the above call
  if (requestCode == 1) {
      Uri _uri = i.getData();

    // this will be null if no image was selected...
    if (_uri != null) {
      // now we get the path to the image file
     cursor = getContentResolver().query(_uri, null,
                                      null, null, null);
     cursor.moveToFirst();
     String imageFilePath = cursor.getString(0);
     cursor.close();
     }
   }

我的建议是尽量让检索图像工作正确，我认为问题是在存储卡上访问图像的内容。看一下在sd卡上显示图像。

如果您能够启动并运行它(可能通过示例提供正确的提供程序)，那么您应该能够为您的代码找到一种变通方法。

通过更新这个问题来让我了解你的进展。祝你好运

假设在SD卡目录中有一个图像文件夹仅用于图像。

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// tells your intent to get the contents
// opens the URI for your image directory on your sdcard
intent.setType("file:///sdcard/image/*"); 
startActivityForResult(intent, 1);

然后，您可以决定如何处理活动中的内容。

这是一个检索图像路径名称的示例，用您的代码进行测试，以确保您可以处理返回的结果。您可以根据需要更改代码以更好地满足您的需求。

protected final void onActivityResult(final int requestCode, final int
                     resultCode, final Intent i) {
    super.onActivityResult(requestCode, resultCode, i);

  // this matches the request code in the above call
  if (requestCode == 1) {
      Uri _uri = i.getData();

    // this will be null if no image was selected...
    if (_uri != null) {
      // now we get the path to the image file
     cursor = getContentResolver().query(_uri, null,
                                      null, null, null);
     cursor.moveToFirst();
     String imageFilePath = cursor.getString(0);
     cursor.close();
     }
   }

我的建议是尽量让检索图像工作正确，我认为问题是在存储卡上访问图像的内容。看一下在sd卡上显示图像。

如果您能够启动并运行它(可能通过示例提供正确的提供程序)，那么您应该能够为您的代码找到一种变通方法。

通过更新这个问题来让我了解你的进展。祝你好运

这是一个完整的解决方案。我刚刚用@mad在下面的答案中提供的信息更新了这个示例代码。还可以查看下面来自@Khobaib的解决方案，解释如何处理picasa图像。

更新

我刚刚回顾了我最初的答案，并创建了一个简单的Android Studio项目，您可以从github签出并直接导入到您的系统。

https://github.com/hanscappelle/SO-2169649

(注意多个文件选择仍然需要工作)

单张图片选择

感谢用户mad，支持来自文件探索者的图像。

public class BrowsePictureActivity extends Activity {

    // this is the action code we use in our intent, 
    // this way we know we're looking at the response from our own action
    private static final int SELECT_PICTURE = 1;

    private String selectedImagePath;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        findViewById(R.id.Button01)
                .setOnClickListener(new OnClickListener() {

                    public void onClick(View arg0) {

                        // in onCreate or any event where your want the user to
                        // select a file
                        Intent intent = new Intent();
                        intent.setType("image/*");
                        intent.setAction(Intent.ACTION_GET_CONTENT);
                        startActivityForResult(Intent.createChooser(intent,
                                "Select Picture"), SELECT_PICTURE);
                    }
                });
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                selectedImagePath = getPath(selectedImageUri);
            }
        }
    }

    /**
     * helper to retrieve the path of an image URI
     */
    public String getPath(Uri uri) {
            // just some safety built in 
            if( uri == null ) {
                // TODO perform some logging or show user feedback
                return null;
            }
            // try to retrieve the image from the media store first
            // this will only work for images selected from gallery
            String[] projection = { MediaStore.Images.Media.DATA };
            Cursor cursor = managedQuery(uri, projection, null, null, null);
            if( cursor != null ){
                int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                String path = cursor.getString(column_index);
                cursor.close();
                return path;
            }
            // this is our fallback here
            return uri.getPath();
    }

}

选择多张图片

因为有人在评论中要求这些信息，所以最好收集信息。

在intent上设置一个额外的参数EXTRA_ALLOW_MULTIPLE:

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

在Result处理中检查该参数:

if (Intent.ACTION_SEND_MULTIPLE.equals(data.getAction()))
        && Intent.hasExtra(Intent.EXTRA_STREAM)) {
    // retrieve a collection of selected images
    ArrayList<Parcelable> list = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
    // iterate over these images
    if( list != null ) {
       for (Parcelable parcel : list) {
         Uri uri = (Uri) parcel;
         // TODO handle the images one by one here
       }
   }
} 

注意，只有API级别18+支持这一点。

这是我对这个主题的回顾，收集了这里的所有信息，再加上其他相关的堆栈溢出问题。它从某些提供者返回图像，同时处理内存不足的情况和图像旋转。它支持画廊，picasa和文件管理器，如下拉框。用法很简单:作为输入，构造函数接收内容解析器和uri。输出是最终的位图。

/**
 * Creates resized images without exploding memory. Uses the method described in android
 * documentation concerning bitmap allocation, which is to subsample the image to a smaller size,
 * close to some expected size. This is required because the android standard library is unable to
 * create a reduced size image from an image file using memory comparable to the final size (and
 * loading a full sized multi-megapixel picture for processing may exceed application memory budget).
 */

public class UserPicture {
    static int MAX_WIDTH = 600;
    static int MAX_HEIGHT = 800;
    Uri uri;
    ContentResolver resolver;
    String path;
    Matrix orientation;
    int storedHeight;
    int storedWidth;

    public UserPicture(Uri uri, ContentResolver resolver) {
        this.uri = uri;
        this.resolver = resolver;
    }

    private boolean getInformation() throws IOException {
        if (getInformationFromMediaDatabase())
            return true;

        if (getInformationFromFileSystem())
            return true;

        return false;
    }

    /* Support for gallery apps and remote ("picasa") images */
    private boolean getInformationFromMediaDatabase() {
        String[] fields = { Media.DATA, ImageColumns.ORIENTATION };
        Cursor cursor = resolver.query(uri, fields, null, null, null);

        if (cursor == null)
            return false;

        cursor.moveToFirst();
        path = cursor.getString(cursor.getColumnIndex(Media.DATA));
        int orientation = cursor.getInt(cursor.getColumnIndex(ImageColumns.ORIENTATION));
        this.orientation = new Matrix();
        this.orientation.setRotate(orientation);
        cursor.close();

        return true;
    }

    /* Support for file managers and dropbox */
    private boolean getInformationFromFileSystem() throws IOException {
        path = uri.getPath();

        if (path == null)
            return false;

        ExifInterface exif = new ExifInterface(path);
        int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                                               ExifInterface.ORIENTATION_NORMAL);

        this.orientation = new Matrix();
        switch(orientation) {
            case ExifInterface.ORIENTATION_NORMAL:
                /* Identity matrix */
                break;
            case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
                this.orientation.setScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                this.orientation.setRotate(180);
                break;
            case ExifInterface.ORIENTATION_FLIP_VERTICAL:
                this.orientation.setScale(1, -1);
                break;
            case ExifInterface.ORIENTATION_TRANSPOSE:
                this.orientation.setRotate(90);
                this.orientation.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_90:
                this.orientation.setRotate(90);
                break;
            case ExifInterface.ORIENTATION_TRANSVERSE:
                this.orientation.setRotate(-90);
                this.orientation.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                this.orientation.setRotate(-90);
                break;
        }

        return true;
    }

    private boolean getStoredDimensions() throws IOException {
        InputStream input = resolver.openInputStream(uri);
        Options options = new Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(resolver.openInputStream(uri), null, options);

        /* The input stream could be reset instead of closed and reopened if it were possible
           to reliably wrap the input stream on a buffered stream, but it's not possible because
           decodeStream() places an upper read limit of 1024 bytes for a reset to be made (it calls
           mark(1024) on the stream). */
        input.close();

        if (options.outHeight <= 0 || options.outWidth <= 0)
            return false;

        storedHeight = options.outHeight;
        storedWidth = options.outWidth;

        return true;
    }

    public Bitmap getBitmap() throws IOException {
        if (!getInformation())
            throw new FileNotFoundException();

        if (!getStoredDimensions())
            throw new InvalidObjectException(null);

        RectF rect = new RectF(0, 0, storedWidth, storedHeight);
        orientation.mapRect(rect);
        int width = (int)rect.width();
        int height = (int)rect.height();
        int subSample = 1;

        while (width > MAX_WIDTH || height > MAX_HEIGHT) {
            width /= 2;
            height /= 2;
            subSample *= 2;
        }

        if (width == 0 || height == 0)
            throw new InvalidObjectException(null);

        Options options = new Options();
        options.inSampleSize = subSample;
        Bitmap subSampled = BitmapFactory.decodeStream(resolver.openInputStream(uri), null, options);

        Bitmap picture;
        if (!orientation.isIdentity()) {
            picture = Bitmap.createBitmap(subSampled, 0, 0, options.outWidth, options.outHeight,
                                          orientation, false);
            subSampled.recycle();
        } else
            picture = subSampled;

        return picture;
    }
}

引用:

http://developer.android.com/training/displaying-bitmaps/index.html 通过编程方式从Android内置的Gallery应用程序中获取/选择一张图像 在将图像加载到位图对象时出现奇怪的内存不足问题 使用ExifInterface设置图像方向 https://gist.github.com/9re/1990019 如何获得位图信息，然后解码位图从internet-inputStream?

检索特定类型的文件

这个示例将获得图像的副本。

static final int REQUEST_IMAGE_GET = 1;

public void selectImage() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");
    if (intent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(intent, REQUEST_IMAGE_GET);
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_GET && resultCode == RESULT_OK) {
        Bitmap thumbnail = data.getParcelable("data");
        Uri fullPhotoUri = data.getData();
        // Do work with photo saved at fullPhotoUri
        ...
    }
}

打开特定类型的文件

在4.4或更高版本上运行时，您请求打开由另一个应用程序管理的文件

static final int REQUEST_IMAGE_OPEN = 1;

public void selectImage() {
    Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
    intent.setType("image/*");
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    // Only the system receives the ACTION_OPEN_DOCUMENT, so no need to test.
    startActivityForResult(intent, REQUEST_IMAGE_OPEN);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_OPEN && resultCode == RESULT_OK) {
        Uri fullPhotoUri = data.getData();
        // Do work with full size photo saved at fullPhotoUri
        ...
    }
}

原始来源

要显示图像和视频，请尝试以下方法:

    Intent intent = new Intent();
    intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, 1);
    startActivityForResult(Intent.createChooser(intent,"Wybierz plik"), SELECT_FILE);