Android :: Update UI From An Event With Thread
Mar 26, 2010
Im working on a small application to try out an idea that I have. The idea is to periodically update the UI when event of some sort occurs. In the demo I've created, I'm updating a ProgressDialog every 2 seconds for 15 turns. The problem I am having, which I don't quite understand is that when an event is handled, I send a message to the handler which is supposed to update the message in the ProgressDialog. When this happens however, I get an exception which states that I can't update the UI from that thread.Am I missing something? The logic makes sense to me and it looks like everything should work, I'm using a handler to update the UI like it is recommended.
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Nov 7, 2010
On what thread are event handlers (like onAnimationEnd, onTouchEvent, onKeyEvent, onClick) executed? Are they called sequentially or can two handlers may execute simultaneously?
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Jan 28, 2010
If I want to send an event, e.g. OnClick, to an activity from a thread? The expected work flow is below:public class HelloAndroid extends Activity {public void onCreate(Bundle savedInstanceState)Code...
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May 27, 2010
I have a separate thread running to get data from the internet. After that, I would like to update the ListView in the main thread by calling adapter.notifyDataSetChanged(). But it does not work. Any workaround for that?
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Aug 11, 2010
I hope it is the right android group for this question. I have a widget that is essentially an image button that toggles display and speaker modes on a custom Android 2.1 platform. It also displays different images to indicate what mode is currently selected. We are adding a hardware button that can also change the same display modes externally. I will have a driver that translates button presses to some events (maybe emulate a key press through input events or something else). If the user changes the mode by pressing hardware button, the widget will not know about that and will display wrong image. Is there a way to synchronize the widget state with the current mode without constantly polling the driver from the widget code? Widget can start a background service that would poll my driver every second or so and update the picture according to the mode reported by the driver. It does not look like a good solution to me. Can widgets receive any events besides clicks? Can widget detect when it becomes visible ? It looks like "remoteViews" cannot register any event listeners other than OnClickListener
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Nov 4, 2009
I've posted this in a couple of places without any help so hopefully this group has some helpful people :) I have an AutoCompleteTextView which I want to populate with artist names based on what the user types.The problem is that I have a thread for retrieving the names from a web service, but when I try and update the ArrayAdapter with a Handler on the UI thread (which is called from the web service thread), nothing gets updated on screen. When I type another letter though, then the previous results from web service are displayed in the autocompletetextview rather than the latest.
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Aug 28, 2009
I am seeing some weird issues and looking to see if anyone knows what is going on. I have a BroadcastReceiver which updates some views on receiving an event. Some psudo code is shown below. What happens is the function runs fine and the app seems to update the textviews BUT when i then try to clear the textviews parent and add new textviews the linearlayout(parent) blanks out and will now draw any of it's children.
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Jul 31, 2010
I'm trying to learn AsyncTask and Thread but Thread first. I am trying to display a Dialog before "DoSomeTask()" but seems like the Dialog always come after DoSomeTask(). Did I do something wrong here?
--- code---
@Override public void onClick(View v) {
// TODO Auto-generated method stub mainProcessing();
DoSomeTask(); } private void mainProcessing() {
Thread thread = new Thread(null, doBackgroundThreadProcessing, "Background");
thread.start(); }
private Runnable doBackgroundThreadProcessing = new Runnable() {
public void run() { backgroundThreadProcessing();
} };
private void backgroundThreadProcessing() {
handler.post(doUpdateGUI);
} private Runnable doUpdateGUI = new Runnable() {
public void run() { updateGUI();
} };
private void updateGUI() {
final ProgressDialog dialog = new ProgressDialog(CloseVault.this);
dialog.setMessage("Please wait...");
dialog.show();
}
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May 9, 2010
I try to make several connection in a class and update the multiple progressbar in the main screen. But I've got the following error trying to use thread in android : Code: 05-06 13:13:11.092: ERROR/ConnectionManager(22854): ERROR:Can't create handler inside thread that has not called Looper.prepare() Here is a small part of my code in the main Activity.
public class Act_Main extends ListActivity
{ private ConnectionManager cm;
public void onCreate(Bundle savedInstanceState)
{ super.onCreate(savedInstanceState);
// Set up the window layout
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title); }
public void startConnection() { ......
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Oct 19, 2010
Curious to know the reason behind not allowing updating UI elements from background thread in Android. Will main thread does something more (probably interacting with framework) after updating the UI elements so that changes can be seen on the screen? Is it the same case with other GUI tool kits?
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Mar 16, 2009
I like that my GUI appears immediatly when the User starts the APP. Than some Data (text, Pictures) come loaded in the Background (like Youtube APP) The Listview and Gallery comes updated automaticly with this new Data.
I initiate my Listview, start a Thread and load the Data....and than the Listview does not come updated!!
Several People write I should use notifyDataSetChanged(). But I can not place this Command in my Thread (just unknown).
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Mar 3, 2009
My purpose is very simple : each 1second, I want to redraw an object on different place on background. I do not know where my error on this code below. Here is my code:
public class My_View extends View{ private Bitmap mBackground_img;
private Drawable mMoveObject; private int mObjectw,mObjecth; private int Dx,Dy;
private Handler myHandler = new Handler(); private long lasttime;
public My_View(Context context,AttributeSet ats,int ds) {
super(context,ats,ds); init(context);
} public My_View(Context context,AttributeSet ats) { super(context,ats);
init(context); } public My_View(Context context) { super(context);
init(context); } public void change() { invalidate();
} private void init(Context context) {
Resources res = context.getResources();
mMoveObject = res.getDrawable (R.drawable.lander_firing);
mBackground_img = BitmapFactory.decodeResource(res, R.drawable.my_pic);
mObjectw = mMoveObject.getIntrinsicWidth();
mObjecth = mMoveObject.getIntrinsicHeight();
Dx = Dy = 0; lasttime = System.currentTimeMillis() + 1000;
Thread mthread = new Thread(null,doBackground,"Background");
mthread.start(); } private Runnable doBackground = new Runnable() {
public void run() { long now = System.currentTimeMillis();
if(lasttime < now ) { Dx = Dx + 10; Dy = Dy + 10;
lasttime = now + 1000; myHandler.post(change_view);
} } }; private Runnable change_view = new Runnable() {
public void run() { change();
} };
@Override public void onDraw(Canvas canvas) {
canvas.drawBitmap(mBackground_img,0 ,0 , null);
mMoveObject.setBounds(Dx, Dy, Dx+mObjectw, Dy+mObjecth);
mMoveObject.draw(canvas);
} }
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Aug 18, 2010
Look at my code.
- code -
private Handler handler = new Handler(); private ProgressDialog dialog;
final Runnable runInUIThread = new Runnable() { public void run() { dialog.dismiss();
} };
private void DoThis() {
dialog = new ProgressDialog(Main.this); dialog.setTitle("Title");
dialog.setMessage("Text"); dialog.show();
Thread newTask = new Thread() {
@Override public void run() { Looper.prepare(); DoThat();
handler.post(runInUIThread); Looper.loop();
); newTask.start(); } }
Is it possible to use test.setText("something") in this thread to update a Button text or TextView in the LinearLayout after the dialog is dismissed? I try cheating placing:
test.setVisibility(View.INVISIBLE);
test.setText("something");
test.setVisibility(View.VISIBLE);
after dialog.show();
It kind of updated the text when the dialog open. I want to do it after the dialog was dismissed. What is the correct way to implement this in my thread?
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Sep 22, 2010
Anxious to see when people start getting this update.
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Sep 22, 2010
Has anyone noticed the following after the update?YouTube has a new stock home page widget which shows most popular videos ( that seems to mean that it is constantly checking now)The screen brightness is darker. I always have the screen set as low as it can go (I use quick settings) but now it appears darker then before.
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Sep 22, 2010
We need to keep it down to one or two threads, it's kinda getting out of hand in here For those searching for info, and especially for newbies or non techies it can really confuse.
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Apr 12, 2009
I use onLongClick and onClick events of a button to get user inputs. Whenever; the user long click and triggers onLongClick event, the onClick event is also triggered. I couldn't find my problem. The code of two methods are shown in below: Code...
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Sep 22, 2010
For those of you who were unlucky enough to attempt an SBF Flash on your OTA 2.2, You would have found youself bricked and awaiting an Updated leaked 2.2 SBF.I'll be bringing news here as it comes in. As soon as it hits anywhere,
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Nov 4, 2010
DROID Incredible Update Ready, Looks Like a Bug Fixer - Droid Life: A Droid Community Blog.Looks to be reporting about a confirmed bug fixing update from Verizon for our 2.2 devices.I did checked my DI but it says I'm on the latest version.I will be keeping an eye out though.
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May 6, 2010
Got the ota at about 5 am this morning, but it froze and didn't work. So when I restarted it said no update available. Wonder if there's something wrong with me phone.
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Aug 3, 2010
So I thought to help the madness on the others threads that we could make one with all of the pros and cons we have seen in the new official update to help people see what they should do as far as force it or root and etc.Flash is not included so you have to find it in dumb ways and it is not in the market.No more vibrate and silent modes being separate.
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Nov 4, 2010
This is what orange UK just sent me
Great news. In the next few weeks there'll be a software update available for your Sony Ericsson X10. For more information go to orange.co.uk/helpx10.
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Oct 29, 2010
I'm new to this place, but how many 2.1 threads do we need here?Starting 'anticipation' threads today is pointless! Helpful people on forums naturally give out all the news as and when it comes, so.If you think, "Sod it... I'll get it when they're ready to give me it", then join me here! Pour a drink, roll a number.... and chill... maybe even talk about something else in the meantime?(Haha - sorry guys... I'm having a bit of a giggle at your expense, but it's getting a bit 2.1 crazy in here!)
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Sep 7, 2010
How can I implement a run() method of thread if I create a Thread Global?
I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?
In the run() method I have to write the code to perform some action.
IF I can do it then please can anyone show me briefly how to do it particularly.
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May 21, 2009
I am writing an application in which i need to handle messages between the main thread(the deafult UI related thread) and the user created Gamethread.
The requirement is like this.
An activity(say "Activity_X") is setting the view by "setContentView(some "View_Y")". In "Activity_X" i have implemeted "onCreateOptionsMenu()" and "onOptionsItemSelected()" fucntions for creating menus & a switch case for action to be taken on selecting those menus.Menu has items like "resume/pause/zoom/" .
All action to be take on selecting these menus are implemented in "View_Y" in a separate Gamethread by extending "Thread" class.
So whenever a menu is selected in "Activity_X" i need to send a message to "View_Y". And on receiving this ,a particular action/method should be called in View_Y(GameThread).
How can i achieve this using Handlers?Is there any other way of doing this? Please do share with me some code snippets for these.
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Jul 22, 2009
I want to do the drawing in another thread to speed up the game(it is way to slow right now). I was told to do this but don't quite understand why that would speed things up. Is it GameView that should implement Runnable? Should I make the thread sleep when not drawing? where should I start the thread? package com.android.WWS;
import android.app.Activity; import android.content.Context; import android.graphics.*; import android.os.Bundle; import android.view.SurfaceView; import android.view.KeyEvent; import android.view.View; import android.view.View.OnKeyListener; import java.lang.Runnable; import java.lang.Thread;...................
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Dec 15, 2009
I hope there is a way to resolve this or bye bye hero.
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Feb 20, 2009
I need to suspend/resume a thread from another thread in the same process. I tried to look into thread apis,but I couldn't figured out a way to achieve this.Can anyone pls point me some references to look or give a tip to do this.
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Dec 28, 2009
Does anyone know how to delete certain texts from a thread in an easy manner instead of having to delete a whole thread??
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Jul 16, 2010
The Android doc says "Like activities and the other components, services run in the main thread of the application process." Is the main thread here the same thing as UI thread?
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