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  • Android -- Object Creation/Memory Allocation vs. Performance

    - by borg17of20
    Hello all, This is probably an easy one. I have about 20 TextViews/ImageViews in my current project that I access like this: ((TextView)multiLayout.findViewById(R.id.GameBoard_Multi_Answer1_Text)).setText(""); //or ((ImageView)multiLayout.findViewById(R.id.GameBoard_Multi_Answer1_Right)).setVisibility(View.INVISIBLE); My question is this, am I better off, from a performance standpoint, just assigning these object variables? Further, am I losing some performance to the constant "search" process that goes on as a part of the findViewById(...) method? (i.e. Does findsViewById(...) use some sort of hashtable/hashmap for look-ups or does it implement an iterative search over the view hierarchy?) At present, my program never uses more than 2.5MB of RAM, so will assigning 20 or so more object variables drastically affect this? I don't think so, but I figured I'd ask. Thanks.

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  • How to justify text on a TextView made easy- Android

    - by Juan
    I'm looking for a simple way to forget that I'm using a WebView to have justified text in my TextView. Has someone made a custom view for this? I'm well aware that I can do something like this: WebView view = new WebView(this); view.loadData("my html with text justification","text/html","utf-8"); But it gets ugly when you want to set the size, the color or other common properties of the TextView, there must be a more convenient way of doing it.

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  • android, find the nearest location without going through all the locations

    - by Marwan
    I am building a taxi dispatching app first: I need the passenger app to show the nearest taxis, now I know how to do that in code but in my way I have to go through all the taxis locations(in database on server) and calculate the distance from the passenger location and get the lowest ones - I don't want to do this because there will be a lot of taxis and going through all of them and making some math is kind of pain on the server- is there a way to get the nearest ones without going through all of them? second: what the best database to use - first, should it be sql or non-sql - I need a very robust database, because there will be a lot of updates (I mean the passengers locations added then deleted when arriving to destination && the taxis location changes frequently) finally: I will use RubyOnRails to do the server side and json as data transfer format, do you have a recommendation to me on something better? Thanks

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  • Connecting GPS coordinates taken from a database in Android using Overlay

    - by LordSnoutimus
    I am currently building an application that allows users to track where their phone has been on a Google Map. At the moment, when the onLocationChanged() method is called, the application stores the current GPS longitude and latitude in a database and calls the animateTo() method to the current position. Using SDK 1.5, how would I go about connecting these points with a coloured line drawn on the MapView using an Overlay?.

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  • Custom Attributes in Android

    - by Arun
    I'm trying to create a custom attribute called Tag for all editable elements. I added the following to attrs.xml <declare-styleable name="Spinner"> <attr name="tag" format="string" /> </declare-styleable> <declare-styleable name="EditText"> <attr name="tag" format="string" /> </declare-styleable> I get an error saying "Attribute tag has already been defined" for the EditText. Is it not possible to create a custom attribute of the same name on different elements?

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  • Android game logic problem

    - by semajhan
    I'm currently creating a game and have a problem which I think I know why it is occurring but not entirely sure and even if I knew, don't know how to solve. I have a 2D array 10 x 10 and have a "player" class that takes up a tile. Now, I have created 2 instances of the player and move them around via swiping. Around the edges I have put "walls" that the player cannot walk through and everything works fine, until I remove a wall. Once I remove a wall and move the character/player to the edge of the screen, the player cannot go any further. The problem occurs here, where the second instance of the player is not at the edge of the screen but say 2 tiles from the first instance of "player" who is at the edge. If I try moving them further into the direction of the edge, I understand that the first instance of player wouldn't move or do anything but the second instance of player should still move, but it won't. This is the code that executed when the user swipes: if (player.getArrayX() - 1 != player2.getArrayX()) { player.moveLeft(); } else if (player.getArrayX() - 1 == player2.getArrayX() && player.getArrayY() != player2.getArrayY()) { player.moveLeft(); } if (player2.getArrayX() - 1 != player.getArrayX()) { player2.moveLeft(); } else if (player2.getArrayX() - 1 == player.getArrayX() && player2.getArrayY() != player.getArrayY()) { player2.moveLeft(); } In the player class I have: public void moveLeft() { if (alive) { switch (levelMaster.getLevel1(getArrayX() - 1, getArrayY())) { case 0: break; case 1: subX(); // basically moves player left setArrayX(getArrayX() - 1); // shifts x coord of player 1 within tilemap Log.d("semajhan", "x: " + getArrayX()); break; case 9: subX(); setArrayX(getArrayX() - 1); setAlive(false); break; } } } Any help on the matter or further insight would be greatly appreciated, thanks.

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  • Consume a JSON webservice and process data in Android

    - by user1783391
    I am trying to consume a the webservice below http://62.253.195.179/disaster/webservices/login.php?message=[{"email":"[email protected]","password":"welcome"}] This returns a JSON array [{"companyuserId":"2","name":"ben stein","superiorname":"Leon","departmentId":"26","departmentname":"Development","companyId":"23","UDID":"12345","isActive":"1","devicetoken":"12345","email":"[email protected]","phone":"5456465465654","userrole":"1","chngpwdStatus":"1"}] My code is below try{ String weblink = URLEncoder.encode("http://62.253.195.179/disaster/webservices/login.php?message=[{\"email\":\"[email protected]\",\"password\":\"welcome\"}]"); HttpParams httpParameters = new BasicHttpParams(); int timeoutConnection = 7500; HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); int timeoutSocket = 7500; HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); HttpClient client = new DefaultHttpClient(httpParameters); HttpGet request = new HttpGet(); URI link = new URI(weblink); request.setURI(link); HttpResponse response = client.execute(request); BufferedReader rd = new BufferedReader(new InputStreamReader( response.getEntity().getContent())); result = rd.readLine(); JSONObject myData = new JSONObject(result); JSONArray jArray = myData.getJSONArray(""); JSONObject steps = jArray.getJSONObject(0); String name = steps.getString("name"); } catch (JSONException e) { e.printStackTrace(); } But its not working and I am not 100% sure this is the best way to do it. 11-10 10:49:55.489: E/AndroidRuntime(392): java.lang.IllegalStateException: Target host must not be null, or set in parameters.

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  • Rich image scroll and zooming on android

    - by F0RR
    I'm looking for a way to implement image zoom and scrolling the way it is implemented in Droid Comic Viewer. Is there any quick way to do that? If not, then could you please give some advices at least on implementing kinetic scrolling.

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  • Android MediaPlayer Won't Play Different Sounds

    - by cYn
    I'm making a simple app that plays a different sound according to its orientation. So if it's placed face down, a sound is played. If placed on its left side, a different sound is played. I'm having a hard time manipulating MediaPlayer correctly. My app runs fine. But it will only play one sound. For example. When I first boot up my app and place my device facing up, a sound will play. If I change its orientation, the sound will pause. But it will not start a different sound in a different orientation. BUT, if I place the device back facing up, it resumes the sound that it paused. I know I'm doing something wrong here, but I can't seem to figure it out the correct structure in using MediaPlayer and the program constantly calling it through onSensorChanged. public class MainActivity extends Activity implements SensorEventListener{ MediaPlayer mpAudioAttention; MediaPlayer mpAudioAssembly; MediaPlayer mpAudioRecall; MediaPlayer mpAudioRetreat; MediaPlayer mpAudioReveille; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); sm = (SensorManager) getSystemService(SENSOR_SERVICE); setContentView(R.layout.main); mpAudioAttention = MediaPlayer.create(this, R.raw.attention); mpAudioAssembly = MediaPlayer.create(this, R.raw.assembly); mpAudioRecall = MediaPlayer.create(this, R.raw.recall); mpAudioRetreat = MediaPlayer.create(this, R.raw.retreat); mpAudioReveille = MediaPlayer.create(this, R.raw.reveille); } public void onSensorChanged(SensorEvent event) { synchronized (this) { Log.d(tag, "onSensorChanged: " + event + ", z: " + event.values[0] + ", x: " + event.values[1] + ", y: " + event.values[2]); zViewO.setText("Orientation Z: " + event.values[0]); xViewO.setText("Orientation X: " + event.values[1]); yViewO.setText("Orientation Y: " + event.values[2]); } //face down if (event.values[2] > -11 && event.values[2] < -9){ mpAudioRetreat.start(); } else mpAudioRetreat.pause(); //face up if (event.values[2] < 11 && event.values[2] > 9){ mpAudioReveille.start(); } else mpAudioReveille.pause(); //standing if (event.values[0] > -10 && event.values[0] < -8){ mpAudioAttention.start(); } else mpAudioAttention.pause(); //left sideways if (event.values[1] < 11 && event.values[1] > 9){ mpAudioAssembly.start(); } else mpAudioAssembly.pause(); //right sideways if (event.values[1] > -11 && event.values[1] < -9){ mpAudioRecall.start(); } else mpAudioRecall.pause(); }

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  • developing daily alarm in android

    - by zoza
    I have this piece of code that fire the alarm once by setting a time and date using the TimePicker and the DatePicker in another activity. i want to modify it in a way that whenever i set a time and a date it will fire the alarm everyday at the same time. in other words i want the alarm to be fired dialy public class M_ReminderManager { private Context mContext; private AlarmManager mAlarmManager; public M_ReminderManager(Context context) { mContext = context; mAlarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); } public void setReminder(Long reminderId, Calendar when) { Intent i = new Intent(mContext, Medicines_OnAlarmReceiver.class); i.putExtra(RemindersDbAdapter.KEY_ROWID_MEDS, (long)reminderId); PendingIntent pi = PendingIntent.getBroadcast(mContext, 0, i, PendingIntent.FLAG_ONE_SHOT); mAlarmManager.set(AlarmManager.RTC_WAKEUP, when.getTimeInMillis(), pi); } } i have tried using setRepeating function but i dont know how exactly i should set the attributes i used this line instead of the set fuction on the code but it didn't work: mAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, when.getTimeInMillis() ,AlarmManager.INTERVAL_DAY , pi); can someone help me with it? thanks in advance,

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  • Android: Problems downloading images and converting to bitmaps

    - by Mike
    Hi all, I am working on an application that downloads images from a url. The problem is that only some images are being correctly downloaded and others are not. First off, here is the problem code: public Bitmap downloadImage(String url) { HttpClient client = new DefaultHttpClient(); HttpResponse response = null; try { response = client.execute(new HttpGet(url)); } catch (ClientProtocolException cpe) { Log.i(LOG_FILE, "client protocol exception"); return null; } catch (IOException ioe) { Log.i(LOG_FILE, "IOE downloading image"); return null; } catch (Exception e) { Log.i(LOG_FILE, "Other exception downloading image"); return null; } // Convert images from stream to bitmap object try { Bitmap image = BitmapFactory.decodeStream(response.getEntity().getContent()); if(image==null) Log.i(LOG_FILE, "image conversion failed"); return image; } catch (Exception e) { Log.i(LOG_FILE, "Other exception while converting image"); return null; } } So what I have is a method that takes the url as a string argument and then downloads the image, converts the HttpResponse stream to a bitmap by means of the BitmapFactory.decodeStream method, and returns it. The problem is that when I am on a slow network connection (almost always 3G rather than Wi-Fi) some images are converted to null--not all of them, only some of them. Using a Wi-Fi connection works perfectly; all the images are downloaded and converted properly. Does anyone know why this is happening? Or better, how can I fix this? How would I even go about testing to determine the problem? Any help is awesome; thank you!

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  • Playing Ogg Sound in Android

    - by baba tenor
    In my application, I am trying to play a sound file in ogg format, stored in raw folder in res directory of my application. When I press the button that calls below function, it just freezes with the button pressed and does not respond. In the end, I have to terminate the application from Eclipse. Nothing about an error or exception in Logcat. In debugging mode, it enters create function and never comes back. What am I doing wrong? private void playbeep() { mPlayer = MediaPlayer.create(this, R.raw.beep); mPlayer.start(); mPlayer.release(); }

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  • Facebook,Android- How to get friends birthday from facebook

    - by Eriz
    I tried to goto lots of questions on this forum but could not find one useful so i decided to ask one myself. I want to pull the birthday's of all the friends in the users friend list. After going through a lot of stuff i found there are 2 ways to do that 1. Graph API 2. FQL Query So, my first question is , which one of them is better/easy to integrate in the app. Q2. http://developers.facebook.com/docs/tutorials/androidsdk/3.0/scrumptious/ is this tutorial useful for what i want to do. Q3. If i use Graph API/FQL Query , could you please give me a link which is helpful or a Code snippet Thanks In Advance, Eriz

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  • Android: Get the screen resolution / pixels as integer values

    - by poeschlorn
    Hi guys, this is a really simple question on which I've found no answer :/ How can I quickly access the screen resolution (width, height) as integer values? I've tried this one, but it always shows zero on my emulator: DisplayMetrics dm = new DisplayMetrics(); int width = dm.widthPixels / 2; In my case I want to dynamically create a table with tableRows, each containing two cols. This cols all shall fill half of the screen in width. Can someone give me a hint?

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  • draw is being constantly called in my android map overlay

    - by Itsik
    I'm trying to draw a route onto my MapView. I've extended Overlay and implemented the draw() method. The route is displayed properly, although while debugging, I added a breakpoint on draw(), and noticed it is being called constantly. I only want it to be re-drawn if someone moves the map or zooms (the draw take into account these changes when drawing the route) What can cause this ?

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  • Android different resolutions problem

    - by user346665
    Hi, I have 9 (vertical) radio buttons and they are all showing in default resolution (320x480) without problems . But when I'm trying in resolution for Htc Tattoo (240x320) the last radio button is hidden - there isn't space to be shown. How to make uniformly size ?

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  • [Android] XML Parser

    - by lemon
    I'm trying to extract n0Y7ezLlIYA8R0K54rEmHaTOraBQVSPDjQaGlQxlGso4jdVN1kRxtcfskEs= using w3c dom <html> <div id='token' style='display:none;'> n0Y7ezLlIYA8R0K54rEmHaTOraBQVSPDjQaGlQxlGso4jdVN1kRxtcfskEs= </div> </html> but I seem to be stuck DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document doc = builder.parse(con.getInputStream()); NodeList list = doc.getElementsByTagName("div"); Can someone please point me to some basic tutorials that would help me solve my dilemma. Thanks.

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  • Custom android preference type loses focus when typing

    - by Brian
    I created a simple preference class that shows an AutoCompleteTextView control and it displays properly but when i focus on the AutoCompleteTextView and start typing it brings up the keyboard but then immediately loses focus on the control. Any idea why this loses focus? Here's what i did to create the view. the inflated layout is just a basic linear layout with a title textview in it. I could change it to a dialog preference instead I guess but it'd be smoother if it could be part of the base view. @Override protected View onCreateView(ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.base_preference, null); if (mHint != null) { TextView hintView = (TextView) layout.findViewById(R.id.PreferenceHintTextView); hintView.setText(mHint); } TextView titleView = (TextView) layout.findViewById(R.id.PreferenceTitleTextView); titleView.setText(getTitle()); AutoCompleteTextView inputView = new AutoCompleteTextView(getContext()); inputView.setGravity(Gravity.FILL_HORIZONTAL); ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(getContext(), R.layout.auto_complete_text_list_item, getEntries()); inputView.setAdapter(adapter); inputView.setThreshold(1); inputView.setOnItemSelectedListener(this); layout.addView(inputView); return layout; }

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  • Can I take the voice data (f.e. in mp3 format) from speech recognition? [closed]

    - by Ersin Gulbahar
    Possible Duplicate: Android: Voice Recording and saving audio I mean ; I use voice recognition classes on android and I succeed voice recognition. But I want to real voice data not words instead of it. For example I said 'teacher' and android get you said teacher.Oh ok its good but I want to my voice which include 'teacher'.Where is it ? Can I take it and save another location? I use this class to speech to text : package net.viralpatel.android.speechtotextdemo; import java.util.ArrayList; import android.app.Activity; import android.content.ActivityNotFoundException; import android.content.Intent; import android.os.Bundle; import android.speech.RecognizerIntent; import android.view.Menu; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { protected static final int RESULT_SPEECH = 1; private ImageButton btnSpeak; private TextView txtText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txtText = (TextView) findViewById(R.id.txtText); btnSpeak = (ImageButton) findViewById(R.id.btnSpeak); btnSpeak.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent( RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US"); try { startActivityForResult(intent, RESULT_SPEECH); txtText.setText(""); } catch (ActivityNotFoundException a) { Toast t = Toast.makeText(getApplicationContext(), "Ops! Your device doesn't support Speech to Text", Toast.LENGTH_SHORT); t.show(); } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case RESULT_SPEECH: { if (resultCode == RESULT_OK && null != data) { ArrayList<String> text = data .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); txtText.setText(text.get(0)); } break; } } } } Thanks.

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  • Adapter Methods in Android?

    - by Praveen Chandrasekaran
    i have go through the three methods in Adapters classes. getView() newView() bindView() what are the difference between those methods? please share some tutorial, sample code or logics to understand this. Thanks. i have to create a listview with the progressive icons. which adapter you suggest me to do that?

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  • Android CursorAdapters, ListViews and background threads

    - by MattC
    This application I've been working on has databases with multiple megabytes of data to sift through. A lot of the activities are just ListViews descending through various levels of data within the databases until we reach "documents", which is just HTML to be pulled from the DB(s) and displayed on the phone. The issue I am having is that some of these activities need to have the ability to search through the databases by capturing keystrokes and re-running the query with a "like %blah%" in it. This works reasonably quickly except when the user is first loading the data and when the user first enters a keystroke. I am using a ResourceCursorAdapter and I am generating the cursor in a background thread, but in order to do a listAdapter.changeCursor(), I have to use a Handler to post it to the main UI thread. This particular call is then freezing the UI thread just long enough to bring up the dreaded ANR dialog. I'm curious how I can offload this to a background thread totally so the user interface remains responsive and we don't have ANR dialogs popping up. Just for full disclosure, I was originally returning an ArrayList of custom model objects and using an ArrayAdapter, but (understandably) the customer pointed out it was bad memory-manangement and I wasn't happy with the performance anyways. I'd really like to avoid a solution where I'm generating huge lists of objects and then doing a listAdapter.notifyDataSetChanged/Invalidated() Here is the code in question: private Runnable filterDrugListRunnable = new Runnable() { public void run() { if (filterLock.tryLock() == false) return; cur = ActivityUtils.getIndexItemCursor(DrugListActivity.this); if (cur == null || forceRefresh == true) { cur = docDb.getItemCursor(selectedIndex.getIndexId(), filter); ActivityUtils.setIndexItemCursor(DrugListActivity.this, cur); forceRefresh = false; } updateHandler.post(new Runnable() { public void run() { listAdapter.changeCursor(cur); } }); filterLock.unlock(); updateHandler.post(hideProgressRunnable); updateHandler.post(updateListRunnable); } };

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