I have a back-end process running (AsyncTask). I am interested in printing out System.out.println(); to the screen (something like the console in Eclipse) with information so the user is informed which calculations are running in the back.
What I wish to accomplish is seeing the text running on the screen - something like a dialog on top of the currenly-in-focus activity.
Does anyone got experience with this?
Thanks, D.
I don't think you can hijack System.out.print() and send it to the screen. But you can make a TextView and send the new lines of text to it as they are ready. Something like this should work.
String outputStr = "";
//Whenever you want to add a line to the TextView do it like this:
outputStr += "\n" + [yourNewText];
mTxt.setText(outputStr);
If you were to add lots of lines in this manner would appear to the user as the same sort of situation as the eclipse console.
Since you can do this with a TextView you could then add that TextView to a custom dialog and show it to the user.
I believe you also need to be in the UI thread to update a textview. In an asynctask, you call onProgressUpdate, which is then executed in the UI thread. Otherwise, you can use view.post or you can use a Handler.
Related
Expanding the functionality of an under development app, I need to show to the user a progress notification dialog. Problem is, I cannot get it done right. Furthermore, I cannot dismiss this notifier properly. Have tried with a clock and a variable set to e.g. "5000ms" and then to "0", without any lack.
What I need to achieve is the following functionality:
a. Check if the tag "storeparsedData" is in a TinyDB, populated with the fetched JSON data. I have this done, following #Taifun advice in my relative question.
b. If the tag is not there (empty list), do a getWeb.gotText block to get the JSON data (this is done with procedure "getWebData". This functions right, but takes a while about 1'35'' or more, so need to show something to the user.
c. While fetching JSON data form web, need to show a "ShowProgressDialog" notifier to the user, so I can cope with the smartphone being seemingly freeze.
d. If the tag "storeparseData" is populated with fetched JSON data, dismiss the notifier.
Have tried the following coding, without relevant success:
Can someone help me out, to achieve this functionality in this app? A blocks code or something to follow and learn, will be awesome.
Thank you all in advance for your answers.
[Edit1]
After #Taifun suggestions, the functionality in question seems to be working, but there is a problem."ShowProgressDialog" block never fires, neither on device or companion. Also where should block "DismissProgressDialog" be attached to disable notifier upon JSON data received?
Here is the reviewed blocks code, for checking stored tags in TinyDB. "ShowProgressDialog" never fires as it should. Are there any suggestion for this issue?
Here is the blocks code for the getWeb function to get the JSON data:
Please advise, with a block code if applicable.Thank you all.
Your progressNotifier.AfterChoosing event never will fire, because that event only fires after choosing something from a Notifier.ShowChooseDialog block, but not for Notifier.ShowMessageDialog blocks. Therefore use a Notifier.ShowChooseDialog block instead and set the second button in that block to empty string.
Your while loop will freeeze your app, as you already realized... You do not need the Clock.Timer event at all to check if your data is there.
Just do it like this: after having received your data in the Web.GotText event and having stored the data in TinyDB, then dismiss the progress dialog and display the message "Database is ready".
Update: Instead of storing your list n times inside the for each in list loop, you should store it only once after the for each in list loop is finished... Same for the DismissProgressDialog and ShowAlert block...
What is the purpose of that join block? You might want to remove it...
Maybe this question has been ask already, but could not find any answer for almost 2hours of internet search.
There is a graphical UI designer wich is coming along with the last android SDK.
Looks pretty cool and well done.
Nevertheless I * cannot find how to attach an event to the control through the graphical editor.
Of course I can add it manually into the xml, but in that case, what's the purpose of having such tool without that function ?
I mean all the other SDK I had in other languages always include that function.
I've also not been able to find doc about how to use this tool. Quite sad...
Thanks
If you want to add a click event handler, select the button (widget) in the GUI that you want to listen for, and look for the property onClick. Enter the name of the method you want to call when the user clicks on that widget, like.. onMyButtonClick
Then add the method to your Activity
public void onMyButtonClick(View v) {
// I heard the button click
}
The GUI builder is getting there, and is not yet as easy to use as the one in XCode, but it's not hard when you get used to it.
I'd like to develop an application that does some processing on text copied on clipboard.
I want to prevent user from copying the text, switching to my application, pasting the text and clicking on process. The process would be done instantly as the user simply copies text on clipboard. He would then go on the application to see the process done on the text copies he's made.
Is there a way to have a kind of listener on text copies on clipboard ?
Thanks
1.Use ClipboardManager.OnPrimaryClipChangedListener for triggering callback when text is copied in any app.
2.Launch your App when text copy event is triggered
3.Use ClipboardManager.getPrimaryClip () to get the copied text in your app. Use the text as you want it.
And you're done.
The way you mention sounds too intrusive. An alternate way is to parse each "keystroke" as it comes into your app. If it comes in too fast, then don't accept it on the theory that it was pasted in.
Override the long press event on the edittext field.
Check out this post on how to do it.
i have this code
TextView B = (TextView)findViewById(R.id.txtMSG);
B.setText("Loading...");
Call_My_Func();
B.setText("");
my function Call_My_Func() work for 1 minute, but i can see the message "Loading..."
is there in java for android something like Application.DoEvent() like i use in C# ?
You are not seeing the message because you're blocking the UI thread with that long running call (as you seem to know based on your DoEvent comment).
An easy way to move long running operations into another thread is Androids AsyncTask.
I want to know is there any method or any link or tutorial to perform redo undo operation in Android edittext. If any one knows than please let me know.
Quick note on the Antti-Brax/Divers(Kidinov) solution. It works great, except if you try to use it with a TextView post-API 23, you'll run into problems, because guess-what, Google actually added a hidden UndoManager (android.content.UndoManager) and didn't document it or make it obvious it was there. But if you have a hard/bluetooth keyboard in Marshmallow or Nougat and hit ^Z or SHIFT-^Z, you'll get undo/redo.
The problem comes if you're already using Antti-Brax's class with an EditText, and you also hook it to ^Z and shift-^Z, you'll run into problems with anyone using a hard keyboard. Namely the ^Z will trigger BOTH the native and Antti-Brax's undo, leading to two undos simultaneously, which isn't good. And after a few of them, you'll probably get a Spannable out of bounds crash.
A possible solution I found is to subclass the TextView/TextEdit/whatever and intercept the undo/redo calls from the TextView so they don't run as follows:
#Override
public boolean onTextContextMenuItem(int id) {
int ID_UNDO, ID_REDO;
try {
ID_UNDO = android.R.id.undo;
ID_REDO = android.R.id.redo;
} catch (Resources.NotFoundException e) {
ID_UNDO = 16908338; // 0x1020032
ID_REDO = 16908339; // 0x1020033
}
return !((id == ID_UNDO) || (id == ID_REDO)) && super.onTextContextMenuItem(id);
}
Those magic id numbers were found here, and are used only as a backup if the android.R.id.undo values aren't found. (it also might be reasonable to assume that if the values aren't there the feature isn't there, but anyway...)
This is not the best solution because both undo trackers are still there and both are running in the background. But at least you won't trigger both of them simultaneously with ^Z. It's the best I could think to do until this gets officially documented and the getUndoManager() methods of TextView is no longer hidden...
Why they made a feature you can't turn off (or even know if it was there or not) "live" in released Android I can't say.
I just opened an issue on Android's issue tracker if anyone wants to follow this.
There is an implementation of undo/redo for Android EditText in
http://credentiality-android-scripting.googlecode.com/hg/android/ScriptingLayerForAndroid/src/com/googlecode/android_scripting/activity/ScriptEditor.java
The code works but does not handle configuration changes properly. I am working on a fix and will post here when it is complete.
My Google search was :-
android edittext onTextChanged undo
I know this is an old question, but as there is no accepted answer, and this is an issue I've tackled myself from many angles, I'd like to add my solution in case it helps anyone. My answer is probably most relevant to large (1,000words+) volumes of text editing apps that require this feature.
The simplest way to resolve this problem is to make periodic copies of all text on screen, save it to an array and call setText() every time the Undo method is called. This makes for a reliable system, but it isn't ideal for large (i.e. 1,000words+) text editing apps. This is because it:
Is wasteful. It could be that only one word changes in a two thousand word document, so that's one thousand, nine hundred and ninety nine words needlessly committed to memory.
Can lead to performance issues, as some low-tier hardware struggles with rendering large amounts of text. On some of my test devices, this method can lead to freezes of a few seconds whenever Undo is called.
The solution I currently use is comparatively complex, but I've published the results in a library here.
Essentially, this library saves a copy of text as soon as a user begins typing, and then another copy of text once they've stopped typing for a set amount of time (in my case, two seconds). The two text strings are then compared, and the altered section of text returned, the indexes where the alterations occured, and details on whether or not the change was an addition of new text, a deletion, or a replacement of old text with new text.
The net result is that only the necessary text is saved, and when Undo is called, there is only a local delete(), replace() or insert() call, which makes for much faster operations on large text fields.
Here is the undo/redo implementation that was linked to from Gary Phillips' answer extracted into a reusable and universal undo/redo plugin for any widget that descends from a TextView. I added some code for persisting the undo history.
http://code.google.com/p/android/issues/detail?id=6458#c123
Hope this helps.
To preserve EditText Styling with regards to undo:
You can create an ArrayList<EditText> or ArrayList<String> (String containing html text) to store your last 10 (for example) actions. So ArrayList [0] would contain html text from your first action and ArrayList [9] would contain html text from your very last action. Each time the user taps "undo" in your app, you would apply ArrayList [size()-1] to your EditText and then remove ArrayList [size()-1] from your Array.