我使用以下代码获取使用相机拍照后保存图像的照片路径,并且仅在Nexus 5上的Android 6.0上获得NullPointerException。 在同一部手机上升级到Android 6.0之前,它运行良好。
final Uri selectedImageUri = data == null ? null : data.getData();
String selectedImagePath = null;
selectedImagePath = getPath(getActivity(), selectedImageUri);
@TargetApi(19)
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final 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;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[] {
split[1]
};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
它会抛出一个NullPointerException
DocumentsContract.isDocumentUri(context, uri)
更新
我发现问题在于uri为空。 这里是检索URI的代码
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_TAKE_PHOTO){
if( resultCode == Activity.RESULT_OK) {
final boolean isCamera;
if(data == null)
{
isCamera = true;
}
else
{
final String action = data.getAction();
if(action == null)
{
isCamera = false;
}
else
{
isCamera = action.equals(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
}
}
String createdImagePath = null;
if(isCamera)
{
createdImagePath = mCallbacks.getCurrentPhotoPath();
}
else
{
final Uri selectedImageUri = data == null ? null : data.getData();
String selectedImagePath = null;
selectedImagePath = getPath(getActivity(), selectedImageUri);
答案 0 :(得分:1)
也许我找到了解决方案。 我必须在这里添加另一个空检查:
if(data == null || data.getData() == null)
看起来在Android 6.0上,通过相机拍摄照片后返回的Intent与之前的操作系统版本不同,但它不包含任何数据。 因此,检查数据是否为空,就像我现在所做的那样还不够。