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  • How can you tell if an activity is starting or resuming?

    - by Joren
    I have an activity which pulls some JSON from my server, and then uses it to draw a list. That list launches further activities. My problem is that I can't figure out a way to tell if the activity is still alive when you go back to it, so I end up re-querying my JSON from the server and redrawing the list every time the user goes back to the activity. How can I tell if my activity is still alive so I can skip the redraw? Using onRestart works for hitting the home key then going back, but onCreate not onRestart is called if I selected a list item then hit back.

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  • Relatively simple task: How do I pass back the selected item from one activity to another?

    - by Brian D
    I have two activities: one displays an image and a button, the other displays a photo gallery. I want to be able to select any of the images in the gallery and then display them on the first activity in place of the default image. public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gallery); Gallery g = (Gallery) findViewById(R.id.gallery); g.setAdapter(new ImageAdapter(this)); g.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View v, int position, long id) { Toast.makeText(PhotoGallery.this, "Position: " + id, Toast.LENGTH_SHORT).show(); Intent intent=new Intent(); intent.putExtra("PictureID", position); setResult(RESULT_OK, intent); finish(); } }); } Am I even close here? I'm not quite sure what to do with any string or int I would attach to the Intent -- can I attach the object itself? I'd much rather pass back at minimum the string name of the resource (image), but the only thing I can seem to figure out right now is how to pass back the position of the picture ... not a great solution. I can clarify more if necessary -- thanks.

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  • Construct MediaStore uri for specific folder

    - by Mojo Risin
    Hi all, For example if a have two directories /sdcard/Music/Music-1 and /sdcard/Music/Music-2 how can i construct uri to get the files in Music-1 dir for example. I can use MediaStore.Audio.Media.EXTERNAL_CONTENT_URI to get the content of all external storage but how to do the trick only for specific dir.

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  • need help in sms reader

    - by pranay
    i intend to develop an app which would speak to the user the message he desires in the inbox. I have successfully created an app where there is a text box and when the user finishes typing in it and presses a speak button, he can hear what he has written, now how do i extend this to the desired app? please could someone please guide me on this?

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  • How to set gravity (or margins) of ImageView using code?

    - by mastojun
    Hi. I want to add ImageView to FrameLayout with Gravity or margins. but FramLayout and ImageView has no method about that(Actually, I can't found that). Reason that selects Framelayout is to put ImageView on ImageView. Help me plz. It is emergency for me to find solution. thx. Bellow is my code which help understanding my question. FrameLayout imageFrame = new FrameLayout(mContext); imageFrame.setLayoutParams(new GridView.LayoutParams(158, 158)); ImageView frame = new ImageView(mContext); frame = new ImageView(mContext); frame.setLayoutParams(new LayoutParams(158, 158)); frame.setScaleType(ImageView.ScaleType.CENTER_CROP); frame.setImageResource(R.drawable.image_frame_n); ImageView image = new ImageView(mContext); image.setLayoutParams(new LayoutParams(148, 148)); image.setScaleType(ImageView.ScaleType.CENTER_CROP); image.setImageResource(mThumbIds[position]); // image is needed to have a margin or gravity to be positioned at center imageFrame.addView(image); imageFrame.addView(frame);

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  • Creating tabs for calling activities

    - by Rahul Varma
    Hi , I have some activities in my project like, Alerts,HomePage , Calculator etc. What i want to accomplish is to create tabs for all these activities and insert images for these. When we touch the tab the corresponding activity must load. I have done it using the menu options. But i must accomplish this using tabs. The tabs must also be at the bottom of the page... Something like this... Can anyone guide through the process...??? Should i create another class Tabs.java and tabs.xml or should i write tab host for each activity...??? I have tried to find it in google and also in stackoverflowbut in vague. Plz give a solution...

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  • How can I fix this touch event / draw loop "deadlock"?

    - by Josh
    Just want to start out by saying this seems like a great site, hope you guys can help! I'm trying to use the structure laid out in LunarLander to create a simple game in which the user can drag some bitmaps around on the screen (the actual game is more complex, but that's not important). I ripped out the irrelevant parts of LanderLander, and set up my own bitmap drawing, something like BoardThread (an inner class of BoardView): run() { while(mRun) { canvas = lockSurfaceHolder... syncronized(mSurfaceHolder) { /* drawStuff using member position fields in BoardView */ } unlockSurfaceHolder } } My drawStuff simply walks through some arrays and throws bitmaps onto the canvas. All that works fine. Then I wanted to start handling touch events so that when the user presses a bitmap, it is selected, when the user unpresses a bitmap, it is deselected, and if a bitmap is selected during a touch move event, the bitmap is dragged. I did this stuff by listening for touch events in the BoardView's parent, BoardActivity, and passing them down into the BoardView. Something like In BoardView handleTouchEvent(MotionEvent e) { synchronized(mSurfaceHolder) { /* Modify shared member fields in BoardView so BoardThread can render the bitmaps */ } } This ALSO works fine. I can drag my tiles around the screen no problem. However, every once in a while, when the app first starts up and I trigger my first touch event, the handleTouchEvent stops executing at the synchronized line (as viewed in DDMS). The drawing loop is active during this time (I can tell because a timer changes onscreen), and it usually takes several seconds or more before a bunch of touch events come through the pipeline and everything is fine again. This doesn't seem like deadlock to me, since the draw loop is constantly going in and out of its syncronized block. Shouldn't this allow the event handling thread to grab a lock on mSurfaceHolder? What's going on here? Anyone have suggestions for improving how I've structured this? Some other info. This "hang" only ever occurs on first touch event after activity start. This includes on orientation change after restoreState has been called. Also, I can remove EVERYTHING within the syncronized block in the event handler, and it will still get hung up at the syncronized call. Thanks!

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  • How do I correctly use generics?

    - by ninjasense
    I basically am making webrequests and recieving a JSON response. Depending on the request, I am parsing JSON request into objects I have created. The parsing is pretty much the same no matter what the object Im parsing into looks like. So I have a bunch of methods doing the same work only with different objects, I was wondering how I could accomplish this with generics? Here is an example public static ArrayList<Contact> parseContacts(String responseData) { ArrayList<Contact> Contacts = new ArrayList<Contact>(); try { JSONArray jsonContacts = new JSONArray(responseData); if (!jsonContacts.isNull(0)) { for (int i = 0; i < jsonContacts.length(); i++) { Contacts.add(new Contact(jsonContacts.getJSONObject(i))); } } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { } return Contacts; }

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  • ListView - Index and Position Behavior upon restart()

    - by tunneling
    I am using a ListView with an ArrayAdapter that holds objects. When I select an item, I am capturing the position and index of the selected item. If I scroll down prior to selection, the position and index represent the location of the item in the list. Selecting that items takes me to another activity. When I use the back button to return to the list, it seems that the ListView get's a new position and index for the visible items. As a result, I can't figure out how to reference the selected item during the restart() of the ListView Activity. I have tried to caputure position and index, but as I've said, they change upon returning to the Activity. Is my understanding of the ListView "redraw" correct? Does it renumber my items based on what's visible? -When in the life cycle is getView() called? Is there a way to force an update to the ListView so that my caputured index still points to the same object? Thanks, Jason

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  • How to figure out that mp3player is delayed when seek bar is working with ??

    - by elecboy97
    While playing mp3 by mediaplyer and showing the progress with seek bar, the problem is that mp3playing sound is delayed when mediaplyer and seekbar working at the same time. I used thread, handler, timer for solving that problem on seekbar.setProgress(mediaplayer.getCurrentPosition()). what do I do?? sdk can take more playbuffer for mp3player..?? or I should focus on optimizing code than before..??

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  • Exception in Tab program

    - by Kooper
    Here is main code: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Resources res = getResources(); TabHost tabHost = getTabHost(); Intent intent= new Intent(); intent.setClass(this,EGCQuery.class); tabHost.addTab(tabHost.newTabSpe("egcquery").setIndicator ("EGCQuery", res.getDrawable(R.drawable.egcquery)) .setContent(intent)); tabHost.addTab(tabHost.newTabSpec("patientinfo").setIndicator("PatientInfo", res.getDrawable(R.drawable.patientinfo)) .setContent(R.layout.main2)); tabHost.addTab(tabHost.newTabSpec("compinterp").setIndicator("Comp_Interp", res.getDrawable(R.drawable.compinterp)) .setContent(R.layout.main3)); tabHost.setCurrentTab(0)

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  • how to close the activity chooser dialog from progremmatically?

    - by sojan
    Hi, Help needed. I am developing an application which need to show a chooser dialogue .(Am using a SEND_INTENT) .I need to close the chooser dialog after a particular amount of time,say 15 sec. how can i close the chooser dialog? is it possible? Is there any way to get the first item in the chooser? is there a way to filter the items appearing in the chooser dialog.. Any one pls help me am in big trouble. Any Help greatly appreciated.

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  • adding the style attribute via code

    - by nourdine
    hello I was wondering how to assign a style via code in adroid. suppose I have a TextView created with the following snippet: TextView myText = new TextView(this); how do I assign the class xxx so that myText will be styled like an hard coded TextView like this: <TextView style="@style/xxx" /> thanks

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  • Can't call function from within onOptionsItemSelected

    - by Kristy Welsh
    public boolean onOptionsItemSelected(MenuItem item) { //check selected menu item switch (item.getItemId()) { case R.id.exit: this.finish(); return true; case R.id.basic: Difficulty = DIFFICULTY_BASIC; Toast.makeText(YogaPosesActivity.this, "Difficulty is Basic", Toast.LENGTH_SHORT).show(); SetImageView(myDbHelper); return true; case R.id.advanced: Toast.makeText(YogaPosesActivity.this, "Difficulty is Advanced", Toast.LENGTH_SHORT).show(); Difficulty = DIFFICULTY_ADVANCED; SetImageView(myDbHelper); return true; case R.id.allPoses: Toast.makeText(YogaPosesActivity.this, "All Poses Will Be Displayed", Toast.LENGTH_SHORT).show(); Difficulty = DIFFICULTY_ADVANCED_AND_BASIC; SetImageView(myDbHelper); return true; default: return super.onOptionsItemSelected(item); } } I get an error when I call the SetImageView function, which was defined out of the OnCreate Activity. Can you not call a function unless it was defined inside the OnCreate? I get a nullPointer Exception when calling the function.

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  • re-open background application via notification item

    - by user356764
    I got an app with tabs and a notification bar entry, when I send it to background (click on home button) and try to re-open the application via click on the notification bar, the app restarts (last selected tab is lost). When I hold the home button if the application is in the background and select it from there or click the app's icon on the homescreen, the previous state is restored per default (the correct tab is selected) IMO the intent of the notification is wrong, but I'm not sure how to fix it. In short: How to get a background application back to foreground when I click the notification entry? thx!

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  • Problem with SharedPreferences

    - by user547995
    Code for restore: final SharedPreferences settings = getSharedPreferences("pref", 0); settings.getString("user", ""); settings.getString("pw", ""); Code for store: SharedPreferences.Editor editor = settings.edit(); editor.putString("user", etuser.getText().toString()); editor.putString("pw", etpw.getText().toString()); editor.commit(); This code don't work, and no error occur

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  • discrepancy in using AsyncTask, code is executed in weird order

    - by Pentium10
    Hello, In onCreate method I hav the following order of code objItem = new DbClass(this);//the onCreate event creates the database new PrepareAdapter1().execute();//this task uses the tables, but SQLException occures, tables doesn't exists As you see in my short code, I get a new instance of the SQLiteOpenHelper class, which does create the tables in onCreate. And after that I start an AsyncTask instance where I use the created table. But I get SQLiteException as table doesn't not exists. I am using this code in wrong way? I expect the table to be created when I launch the thread.

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  • zooming imageview

    - by M.A. Cape
    Can anyone help on how to use the matrix scaletype to zoom an imageview and also how to use the translate method so that it can be focused at the center? I have tried using webview to be able to use the zooming and scrolling functionalities i needed but it is not nice to look at.

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  • How to pass the values from one activity to previous activity

    - by Kumar
    Dear friends.. Can any one tell me how to pass the value from one screen to its previous screen. Consider the case.i m having two screen first screen with one Textview and button and the second activity have one edittext and button. If i click the first button then it has to move to second activity and here user has to type something in the textbox. If he press the button from the second screen then the values from the textbox should move to the first activity and that should be displayed in the first activity textview. regards, s.kumaran.

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