I'm going through the Tiles Codelab:
https://developer.android.com/codelabs/wear-tiles
I want to use drawables instead of url in the tile layout.
i replace the url with drawable (for example: "R.drawable.ic_search_24")
but i see a blank circle. What is happening?
In the MessagingTileRender.kt (module)
private fun contactLayout(
context: Context,
contact: Contact,
clickable: ModifiersBuilders.Clickable,
) = Button.Builder(context, clickable)
.setContentDescription(contact.name)
.apply {
if (contact.avatarUrl != null) {
//se c'รจ un link recupera l'immagine
setImageContent(R.drawable.ic_search_24.toString())
//setImageContent(contact.imageResourceId())
//mettere qui il recupero dell'immagine
} else {
setTextContent(contact.initials)
//altrimenti prende le iniziali e li mette colorate come bottone
setButtonColors(ButtonColors.secondaryButtonColors(MessagingTileTheme.colors))
}
}
.build()
thanks for trying the codelab.
Tiles can't use drawables directly like this. In your layout, it's necessary to pass a string ID (it's not a url).
In onResourcesRequested() (or similar), you must map that ID to an ImageResource (which can be created from a drawable), as in the codelab.
Check out the finished module for an example.
Related
So, either I am asking incorrectly, or it isn't possible, let's see which...
If my app (Xamarin.Forms) is launched from another app, in order to get a url from my app, how do I return that data to the calling app? I wrongly assumed SetResult and Finish, I also wrongly assumed StartActivityForResult, but there has to be a way to do this. I know how to get data INTO my app from another app, but not the same in return.
POSSIBLE PARTIAL SOLUTION -- UPDATE, FAILS
So I have to setup an interface in my PCL, and call the method from the listview item selected handler, in the Android app I can then do this:
Intent result = new Intent("com.example.RESULT_ACTION", Uri.parse("content://result_url"));
setResult(Activity.RESULT_OK, result);
finish();
(source: https://developer.android.com/training/basics/intents/filters.html)
Is this looking right, and how would I implement the same thing on iOS?
END
I deleted my previous question because I couldn't explain the problem clearly, so here goes.
I have a Xamarin Forms app, I want to use a section of this app as a gallery. Currently I have images displayed in a list, and I have an Intent filter set that launches this page when you select the app as the source for an image (such as upload image on Facebook).
My issue is that I don't know how to return the data (the selected image) back to the app / webpage that made the request. In android I understand that you would use StartActivityForResult and OnActivityResult to handle this, but I am using Xamarin Forms (Android, iOS, UWP) and can't really find a solution that could be used cross-platform.
Just a link to documentation that covers this would be great, but if you have an example then even better.
Thanks
EDIT
Here is the code used to launch the app, I am interested in getting data back from the Intent.ActionPick after the user has selected an image from a ListView, which is in a ContentPage in the PCL.
[Activity(Label = "", Icon = "#drawable/icon", Theme = "#style/DefaultTheme", MainLauncher = true, LaunchMode = LaunchMode.SingleTop,
ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
[IntentFilter(new[] { Intent.ActionSend }, Categories = new[] { Intent.CategoryDefault }, DataMimeType = #"*/*")]
[IntentFilter(new[] { Intent.ActionView, Intent.ActionPick, Intent.ActionGetContent }, Categories = new[] { Intent.CategoryDefault, Intent.CategoryOpenable }, DataMimeType = #"*/*")]
public class MainActivity : FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
try
{
base.OnCreate(bundle);
CurrentPlatform.Init();
Xamarin.Forms.Forms.Init(this, bundle);
App _app = new App();
LoadApplication(_app);
if (Intent.Action == Intent.ActionSend)
{
var image = Intent.ClipData.GetItemAt(0);
var imageStream = ContentResolver.OpenInputStream(image.Uri);
var memOfImage = new System.IO.MemoryStream();
imageStream.CopyTo(memOfImage);
_app.UploadManager(memOfImage.ToArray()); //This allows me to upload images to my app
}
else if (Intent.Action == Intent.ActionPick)
{
_app.SelectManager(); //here is where I need help
}
else
{
_app.AuthManager(); //this is the default route
}
}
catch (Exception e)
{
}
}
It seems you cannot use remote URI to provide to calling app. Some posts I checked suggest to store the file locally and provide it's path to calling app. To avoid memory leak with many files stored I suggest to use the same file name then you will have only one file at any moment.
One more note. I tested this solution in facebook. Skype doesn't seem to accept that and, again, the posts I checked saying that Skype doesn't handle Intent properly (not sure what that means).
Now to solution. In main activity for example in OnCreate method add the follow.
ReturnImagePage is the name of my page class where I select an image
Xamarin.Forms.MessagingCenter.Subscribe<ReturnImagePage, string>(this, "imageUri", (sender, requestedUri) => {
Intent share = new Intent();
string uri = "file://" + requestedUri;
share.SetData(Android.Net.Uri.Parse(uri));
// OR
//Android.Net.Uri uri = Android.Net.Uri.Parse(requestedUri);
//Intent share = new Intent(Intent.ActionSend);
//share.PutExtra(Intent.ExtraStream, uri);
//share.SetType("image/*");
//share.AddFlags(ActivityFlags.GrantReadUriPermission);
SetResult(Result.Ok, share);
Finish();
});
Above will listen for the message when the image is selected.
Then in XFroms code when image is selected dowload it, store it, get path and send to Activity using it's path. Below is my test path
MessagingCenter.Send<ReturnImagePage, string>(this, "imageUri", "/storage/emulated/0/Android/data/ButtonRendererDemo.Droid/files/Pictures/temp/IMG_20170207_174559_21.jpg");
You can use static public class to save and access results like:
public static class StaticClass
{
public static int Result;
}
I am working on a feature for my Android app. I would like to read text from a picture then save that text in a database. Is using OCR the best way? Is there another way? Google suggests in its documentation that NDK should only be used if strictly necessary but what are the downfalls exactly?
Any help would be great.
you can use google vision library for convert image to text, it will give better output from image.
Add below library in build gradle:
compile 'com.google.android.gms:play-services-vision:10.0.0+'
TextRecognizer textRecognizer = new TextRecognizer.Builder(getApplicationContext()).build();
Frame imageFrame = new Frame.Builder()
.setBitmap(bitmap) // your image bitmap
.build();
String imageText = "";
SparseArray<TextBlock> textBlocks = textRecognizer.detect(imageFrame);
for (int i = 0; i < textBlocks.size(); i++) {
TextBlock textBlock = textBlocks.get(textBlocks.keyAt(i));
imageText = textBlock.getValue(); // return string
}
From this Simple example of OCRReader in Android tutorial you can read text from image and also you can scan for text using camera, using very simple code.
This library is developed using Mobile Vision Text API
For scan text from camera
OCRCapture.Builder(this)
.setUseFlash(true)
.setAutoFocus(true)
.buildWithRequestCode(CAMERA_SCAN_TEXT);
For extract text from image
String text = OCRCapture.Builder(this).getTextFromUri(pickedImage);
//You can also use getTextFromBitmap(Bitmap bitmap) or getTextFromImage(String imagePath) buplic APIs from OCRLibrary library.
Text from an image can be extracted using Firebase machine learning (ML) kit. There are two versions of the text recognition API, on-device API (free) and on-cloud API.
To use the API, first create BitMap of the image, which should be upright. Then create FirebaseVisionImage object passing the bitmap object.
FirebaseVisionImage image = FirebaseVisionImage.fromBitmap(bitmap);
Then create FirebaseVisionTextRecognizer object.
FirebaseVisionTextRecognizer textRecognizer = FirebaseVision.getInstance()
.getCloudTextRecognizer();
Then pass the FirebaseVisionImage object to processImage() method, add listeners to the resulting task and capture the extracted text in success callback method.
textRecognizer.processImage(image)
.addOnSuccessListener(new OnSuccessListener<FirebaseVisionText>() {
#Override
public void onSuccess(FirebaseVisionText firebaseVisionText) {
//process success
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
//process failure
}
});
For complete example which shows how to use Firebase ML text recognizer, see https://www.zoftino.com/extracting-text-from-images-android
There is a different option. You can upload your image to the server, OCR it from the server, then get the result.
I have developing a map app by using Google Maps Android API. I used Google Maps Android API Utility Library for adding a GeoJSON layer (in polygon geometry).
String gj = loadJSONfromAssets();
GeoJsonLayer layer = new GeoJsonLayer(mMap, gj);
And also added a WMS layer as TileOverlay. I want map objects selectable. For example users can click on map objects (GeoJSON layer) and get their attributes. About this case I just found that only objects like Point, Polyline, Polygon can have click events. My question is: how can i set this event for all objects in a layer (GeoJSON layer).
I found the example provided at https://github.com/googlemaps/android-maps-utils/blob/master/demo/src/com/google/maps/android/utils/demo/GeoJsonDemoActivity.java had a feature on click listener
// Demonstrate receiving features via GeoJsonLayer clicks.
layer.setOnFeatureClickListener(new GeoJsonLayer.GeoJsonOnFeatureClickListener() {
#Override
public void onFeatureClick(GeoJsonFeature feature) {
Toast.makeText(GeoJsonDemoActivity.this,
"Feature clicked: " + feature.getProperty("title"),
Toast.LENGTH_SHORT).show();
}
});
Any updates on this topic? I got the same problem.
for (i in 0 until body.lands.size) {
val geo = body.lands[i]
val geos = geo.get("geometry")
val properties = geo.get("properties")
Log.i("Properties", properties.toString())
val geometryJson: JSONObject = JSONObject(geos.toString())
val geoJsonData: JSONObject = geometryJson
val layer = GeoJsonLayer(mMap, geoJsonData)
val style: GeoJsonPolygonStyle = layer.defaultPolygonStyle
style.fillColor = resources.getColor(R.color.darkGray)
style.strokeColor = resources.getColor(R.color.darkerGray)
style.strokeWidth = 2f
layer.addLayerToMap()
layer.setOnFeatureClickListener {
Log.i("Properties", properties.toString())
}
}
I've got question. I have application which is a phone book. I would like to create Tile (in Windows Phone main screen) which'll call that number after I click Tile on main screen.
Is that possible? What should I do to make something like that? I can create custom Tile or maybe I should create some method after my application start?
Create the live tile with something like the following code:
string number = "000 - 000 000";
ShellTile tile = ShellTile.ActiveTiles.FirstOrDefault(t => t.NavigationUri.ToString().Contains("phone=" + number));
if (tile == null)
{
StandardTileData tileData = new StandardTileData();
tileData.Title = "Call " + number;
ShellTile.Create(new Uri("/MainPage.xaml?phone=" + number, UriKind.Relative), tileData);
}
And then override the OnNavigatedTo in MainPage.xaml, and add the following code:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (NavigationContext.QueryString.ContainsKey("phone"))
{
string number = NavigationContext.QueryString["phone"];
PhoneCallTask task = new PhoneCallTask();
task.PhoneNumber = number;
task.Show();
}
base.OnNavigatedTo(e);
}
If you have not done it yet, you also need to add the "ID_CAP_PHONEDIALER" capability in the WMAppManifest.xml file, or you will get an exception when calling task.Show(); above.
Now you got a live tile that when clicked will launch the application and call the number (The user must still confirm it in a dialog though, and that is something you can't disable)
Have you tried a flip tile and the using something like this:
http://blog.ecofic.com/?p=406
Write the number to isolated storage then when they click the tile you read the isolated storage and call the number.
You can also use the Mangopollo library from CodePlex to create a secondary live tile: http://mangopollo.codeplex.com/
I want to load images into a Pivot header to substitute the lack of a Gallery control in WP7. I'm trying to populate them from a URL, and want to make sure that the image is not kept in the cache (by setting UriSource = null) to make sure that they don't take too much resources.
There's no way to do this in the XAML itself, can someone give me sample code to handle this from code-behind. my attempts have been unsuccessful. what am I doing wrong here?
public class PhotoGalleryVM
{
public ObservableCollection<BitmapImage> Images
{
get
{
ObservableCollection<BitmapImage> list = new ObservableCollection<BitmapImage>();
foreach (RoomImage r in App.appData.currentChoices.roomImages)
{
BitmapImage img = new BitmapImage(new Uri(Uri.UnescapeDataString(r.largeUri)));
img.UriSource = null;
list.Add(img);
}
return list;
}
}
}
There is an option that enables to ignore image cache:
bitmapImage.CreateOptions = BitmapCreateOptions.IgnoreImageCache;
Read more at msdn