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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I was trying to post a toast notification in case something goes wrong in a worker thread. I do this by putting a handler.post(funcFailed) in the catch block where funcFailed it a runnable and simply called a function funcFailedshow()
funcFailedshow() is defined to be Toast.makeText(App.this,"Error in funcfailed", Toast.LENGTH_LONG).show();
For some reason i cannot see the toast notification. Even if i replace App.this (app is the applications name) with a getApplicationContext() it does not work.
My app forwards MotionEvents, reported by GestureDetector.OnGestureListener, to a worker thread. Right now i am doing it by calling MotionEvent.obtain, pass the obtained copy to the worker thread, handle it and recycle it at the worker thread. Is it required to obtain and recycle a MotionEvent if it is passed to another thread? Or could it safely be skiped? If i am making things overly complicated, could you please explain me at which conditions MotionEvent.obtain is usually called?
View 2 Replies View RelatedI'm implementing a service that contains a thread to handle all time consuming operation. My core service logic is in a different thread than the ui or main thread. According to the Android document, when the OS plans to free some system resource, it will call onDestroy () on the service and only when onDestroy() returns it will kill the process hosting the service, thus giving opportunity to the service to cleanup.Now, when onDestroy() is called, I want to send a message to my service thread to do the necessary cleanup. Only when the service thread acknowledges that the cleanup or shutdown is complete, onDestroy () should return. I could find a way to send asynchronous messages to threads and the corresponding processing of the messages, but not able to figure out how I need to implement onDestroy(), such that it would send a message to the service thread and should wait for a result, before returning.
View 13 Replies View Relatedpackage com.commonsware.android.threads;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class HandlerDemo extends Activity {
Thread mBackground; ProgressBar bar;
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
bar.incrementProgressBy(5);
} }; boolean isRunning = false;
@Override
public void onCreate(Bundle icicle) { super.onCreate(icicle);
setContentView(R.layout.main); bar = (ProgressBar) findViewById(R.id.progress);
} public void onStart() { super.onStart(); bar.setProgress(0);
mBackground = new Thread(new Runnable() { public void run() { try { int a = 0;
for (int i = 0; i < 20 && isRunning; i++) { for (int j = 0; j < 2000; j++) {
for (int k = 0; k < 1000; k++) { a++;
} } handler.sendMessage(handler.obtainMessage());
} } catch (Throwable t) { // just end the background thread } } } );
findViewById(R.id.LoginButton).setOnClickListener(
new OnClickListener() { public void onClick(View v) { mBackground.run();
} } );
isRunning = true;
} public void onStop() { super.onStop();
isRunning = false;
} }
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?
View 1 Replies View RelatedMy 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);
} }
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?
View 1 Replies View RelatedI've read several example programs and tutorials to try and solve my problem but they all seem to go the same way. I've used a couple Activities and xml documents to create a menu that loads when my game starts.When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu,I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView.I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong.
View 1 Replies View RelatedI've read several example programs and tutorials to try and solve my problem but they all seem to go the same way.I've used a couple Activities and xml documents to create a menu that loads when my game starts. When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu, I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView. I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong, I think it's the way I'm using(abusing) the language.
View 1 Replies View RelatedIm 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.
View 1 Replies View RelatedI'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.
View 3 Replies View RelatedI'm in the need of viewing the entire conversation between me and a friend, but since we've sent so many text to each other, I can only scroll up to a certain point, therefore i can't see a lot of messages . What can I do?
View 1 Replies View RelatedIf I have a View that I want updated at the same time another View updates itself. What is the correct way of doing this?
View 2 Replies View RelatedI'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();
}
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() { ......
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).
I have ListViewActivity
public class SelectActivity extends ListActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_one_of);
SimpleAdapter adapter = new SimpleAdapter(
this,
createChildList(),
R.layout.select_one_of_childrow,
new String[] { KEY_VALUE },
new int[] { R.id.selectoneof_add_new_item});
setListAdapter(adapter);
}
// ...
}
after setListAdapter() calls I would like to execute the following code:
((TextView) getListView().getChildAt(0).findViewById(R.id.selectoneof_add_new_item)).setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ticked, 0); but getListView().getChildAt(xxx) returns null and I catch NullPointerException. Where should I put mentioned above code-snippet?
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?
Anxious to see when people start getting this update.
View 49 Replies View RelatedHas 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.
View 49 Replies View RelatedWe 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.
View 4 Replies View RelatedFor 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,
View 49 Replies View RelatedDROID 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.
View 49 Replies View RelatedGot 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.
View 5 Replies View RelatedSo 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.
View 49 Replies View RelatedI have a service running in the background.I have a background thread that gets a reference to the service from the application's main activity. But when the background thread calls a method in the service to display a toast, I get the "Looper not initialized exception".Why,if I have a valid, bound reference to a Service, does this still happen?
View 4 Replies View RelatedThis 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.
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!)
View 49 Replies View RelatedHow 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.