Android选择文件及通过Uri获取文件路径

系统提供了一个文件选择的Action

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);

intent.setType("image/*");

startActivityForResult(imageIntent,100);

在setType中可以选择不同的文件类型,如video/*,audio/*,file/*等.

然后在

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

Uri Uri= data.getData();

}

可以获取到所选择的文件的uri,之后就可以进行你需要的操作了.

我需要获取所选择的文件的路径,在4.4以下版本和4.4及以后版本,通过文件的uri来获取文件路径的查询方式是不同的,现在总结以下,以作记录.

/**
	 * 根据Uri获取文件的绝对路径，解决Android4.4以上版本Uri转换
	 * 
	 * @param activity
	 * @param fileUri
	 */
	@TargetApi(19)
	public static String getFileAbsolutePath(Activity context, Uri fileUri) {
		if (context == null || fileUri == null)
			return null;
		if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, fileUri)) {
			if (isExternalStorageDocument(fileUri)) {
				String docId = DocumentsContract.getDocumentId(fileUri);
				String[] split = docId.split(":");
				String type = split[0];
				if ("primary".equalsIgnoreCase(type)) {
					return Environment.getExternalStorageDirectory() + "/" + split[1];
				}
			} else if (isDownloadsDocument(fileUri)) {
				String id = DocumentsContract.getDocumentId(fileUri);
				Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
				return getDataColumn(context, contentUri, null, null);
			} else if (isMediaDocument(fileUri)) {
				String docId = DocumentsContract.getDocumentId(fileUri);
				String[] split = docId.split(":");
				String type = split[0];
				Uri contentUri = null;
				if ("image".equals(type)) {
					contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
				} else if ("video".equals(type)) {
					contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
				} else if ("audio".equals(type)) {
					contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
				}
				String selection = MediaStore.Images.Media._ID + "=?";
				String[] selectionArgs = new String[] { split[1] };
				return getDataColumn(context, contentUri, selection, selectionArgs);
			}
		} // MediaStore (and general)
		else if ("content".equalsIgnoreCase(fileUri.getScheme())) {
			// Return the remote address
			if (isGooglePhotosUri(fileUri))
				return fileUri.getLastPathSegment();
			return getDataColumn(context, fileUri, null, null);
		}
		// File
		else if ("file".equalsIgnoreCase(fileUri.getScheme())) {
			return fileUri.getPath();
		}
		return null;
	}

	public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
		Cursor cursor = null;
		String[] projection = { MediaStore.Images.Media.DATA };
		try {
			cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
			if (cursor != null && cursor.moveToFirst()) {
				int index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
				return cursor.getString(index);
			}
		} finally {
			if (cursor != null)
				cursor.close();
		}
		return null;
	}

	/**
	 * @param uri
	 *            The Uri to check.
	 * @return Whether the Uri authority is ExternalStorageProvider.
	 */
	public static boolean isExternalStorageDocument(Uri uri) {
		return "com.android.externalstorage.documents".equals(uri.getAuthority());
	}

	/**
	 * @param uri
	 *            The Uri to check.
	 * @return Whether the Uri authority is DownloadsProvider.
	 */
	public static boolean isDownloadsDocument(Uri uri) {
		return "com.android.providers.downloads.documents".equals(uri.getAuthority());
	}

	/**
	 * @param uri
	 *            The Uri to check.
	 * @return Whether the Uri authority is MediaProvider.
	 */
	public static boolean isMediaDocument(Uri uri) {
		return "com.android.providers.media.documents".equals(uri.getAuthority());
	}

	/**
	 * @param uri
	 *            The Uri to check.
	 * @return Whether the Uri authority is Google Photos.
	 */
	public static boolean isGooglePhotosUri(Uri uri) {
		return "com.google.android.apps.photos.content".equals(uri.getAuthority());
	}