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  • onDraw() triggered but results don't show

    - by Don
    I have the following routine in a subclass of view: It calculates an array of points that make up a line, then erases the previous lines, then draws the new lines (impact refers to the width in pixels drawn with multiple lines). The line is your basic bell curve, squeezed or stretched by variance and x-factor. Unfortunately, nothing shows on the screen. A previous version with drawPoint() and no array worked, and I've verified the array contents are being loaded correctly, and I can see that my onDraw() is being triggered. Any ideas why it might not be drawn? Thanks in advance! protected void drawNewLine( int maxx, int maxy, Canvas canvas, int impact, double variance, double xFactor, int color) { // impact = 2 to 8; xFactor between 4 and 20; variance between 0.2 and 5 double x = 0; double y = 0; int cx = maxx / 2; int cy = maxy / 2; int mu = cx; int index = 0; points[maxx<<1][1] = points[maxx<<1][0]; for (x = 0; x < maxx; x++) { points[index][1] = points[index][0]; points[index][0] = (float) x; Log.i(DEBUG_TAG, "x: " + x); index++; double root = 1.0 / (Math.sqrt(2 * Math.PI * variance)); double exponent = -1.0 * (Math.pow(((x - mu)/maxx*xFactor), 2) / (2 * variance)); double ePow = Math.exp(exponent); y = Math.round(cy * root * ePow); points[index][1] = points[index][0]; points[index][0] = (float) (maxy - y - OFFSET); index++; } points[maxx<<1][0] = (float) impact; for (int line = 0; line < points[maxx<<1][1]; line++) { for (int pt = 0; pt < (maxx<<1); pt++) { pointsToPaint[pt] = points[pt][1]; } for (int skip = 1; skip < (maxx<<1); skip = skip + 2) pointsToPaint[skip] = pointsToPaint[skip] + line; myLinePaint.setColor(Color.BLACK); canvas.drawLines(pointsToPaint, bLinePaint); // draw over old lines w/blk } for (int line = 0; line < points[maxx<<1][0]; line++) { for (int pt = 0; pt < maxx<<1; pt++) { pointsToPaint[pt] = points[pt][0]; } for (int skip = 1; skip < maxx<<1; skip = skip + 2) pointsToPaint[skip] = pointsToPaint[skip] + line; myLinePaint.setColor(color); canvas.drawLines(pointsToPaint, myLinePaint); / new color } } update: Replaced the drawLines() with drawPoint() in loop, still no joy for (int p = 0; p<pointsToPaint.length; p = p + 2) { Log.i(DEBUG_TAG, "x " + pointsToPaint[p] + " y " + pointsToPaint[p+1]); canvas.drawPoint(pointsToPaint[p], pointsToPaint[p+1], myLinePaint); } /// canvas.drawLines(pointsToPaint, myLinePaint);

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  • How could I make the SurfaceView and Button have a different orientation in a Activity

    - by ???
    I hava a simple program about video recording . I use the surfaceView to show the preview screen. and I also want to put some buttons on the screen. I put all the component mentioned above into a XML file which is "ipcam.xml" I use MediaRecorder , SurfaceView , SurfaceHolder to complete this program because the preview screen does not orientate correctly when I rotate my phone. so I use "setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);" but , the button in the program is always in LANDSCAPE direction . it will not auto change direction when I rotate my phone , but the preview is ok!! so is there anyway to solve this problem. Thank you all very much in advance.

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  • NullPointerException on TextView

    - by Stephen Adipradhana
    i get a null pointer exception and the program crash on each time i want to update the highscore text using setText(). what causes this problem? this code is when i set my layout, the layout is a part of the gameView using opengl, and i put the highscore textview on the upper left corner public void onCreate(Bundle savedInstanceState) { SFEngine.display = ((WindowManager)getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();//ambl ukuran width height layar super.onCreate(savedInstanceState); gameView = new SFGameView(this); gameView.setLayoutParams(new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); RelativeLayout layout = new RelativeLayout(this); layout.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); TextView textBox = new TextView(this); textBox.setId(1); textBox.setText("HIGH SCORE"); textBox.setBackgroundColor(Color.BLUE); textBox.setWidth(SFEngine.display.getWidth()/2); textBox.setHeight(50); Button pauseButton = new Button(this); pauseButton.setText("PAUSE"); pauseButton.setHeight(50); pauseButton.setWidth(SFEngine.display.getWidth()/2); pauseButton.setOnTouchListener(new OnTouchListener(){ public boolean onTouch(View v, MotionEvent e) { //pause game SFEngine.isPlaying = false; Intent i1 = new Intent(SFGames.this, pause.class); gameView.onPause(); startActivityForResult(i1,0);//hrs pk result soalny mw blk lg return true; } }); RelativeLayout.LayoutParams lp_pause = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); RelativeLayout.LayoutParams lp_hs = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); lp_hs.addRule(RelativeLayout.ALIGN_PARENT_LEFT); lp_pause.addRule(RelativeLayout.ALIGN_PARENT_TOP); lp_pause.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); textBox.setLayoutParams(lp_hs); pauseButton.setLayoutParams(lp_pause); layout.addView(gameView); layout.addView(textBox); layout.addView(pauseButton); setContentView(layout); and here is the setText code public boolean onTouchEvent (MotionEvent event){//buat nerima input user if(!SFEngine.isPlaying){ finish(); } textBox.setText("High Score :" + SFEngine.score);//here is the source of the prob .....

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  • Child view adds itself to another view every time when I show dialog

    - by user565447
    A child view had joined the main view. I don't want it to be so. Look at the screenshot. But I want that the dialog has appeared and it disappeared, and the view of the dialog didn't join itself to main view. After I called dialog, the view of the it joined every time and it looked like this: _http://s014.radikal.ru/i329/1101/cc/4ce75c9e8ae2.jpg _http://i075.radikal.ru/1101/00/f1b132b07e25.jpg But the normal view must look like this: _http://i016.radikal.ru/1101/64/0b2a4718cd0e.jpg Why it happens?

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  • Should we EVER use dp values for width/height?

    - by sandalone
    I've come across a project done by some other team which I have to fix. They used dp values for images' width/height. When I tried to adopt the layout for some tablets and/or mobiles, I've faced a lot of troubles. For example, the image of 40x40 dp has top padding of 15dp. When such image is loaded by some new mobile screen, the image is not where is was supposed to be - it's either shifted or distorted or of the wrong size. Now I need to propose a redesign of the whole app and I need some advise from the more experienced community. Should I abandon such layout policy (described abobe) and do like this: make the image with the size of 40x40 px position the image for the mdpi screen set its height/width to wrap_content do like this for other images after I finish layout for mdpi, resize each image for ldpi, hdpi and xhdpi screens in case of a special mobile/tablet, make a special set of images + xml files Is there a way when you would advise to use the explicit size of some images? Do you advise setting the size of images in xml layout or setting size via photoshop or similar graphics tools and then resize images for other screen sizes or screen densities?

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  • How to send HTTP POST request and recieve response?

    - by Maxim Kachurovskiy
    For example, I need to make the following Client C - Server S conversation and get XIMSS.nonce node value: C:GET /ximsslogin/ HTTP/1.1 Host: myserver.com Content-Type: text/xml Content-Length: 42 <XIMSS><listFeatures id="list" /><XIMSS> S:HTTP/1.1 200 OK Content-Length: 231 Connection: keep-alive Content-Type: text/xml;charset=utf-8 Server: CommuniGatePro/5.3 <XIMSS><nonce>2C3E575E5498CE63574D40F18D00C873</nonce><language>german</language><response id="s"/></XIMSS>

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  • Magento - How can I move the Navigation Block to be in the right column?

    - by Hank
    I've been editing Magento's default CSS to change the look and have come to a point where I want to move around some content blocks. I've killed off the left column through CSS .col-left { display: none; } And then increased the width of the main content part to create a 'two column layout'. What I want to do now is move the navigation for the categories into the right column. I just have no idea how... How do I move content blocks around in Magento? :/

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  • Distinguish between screen timeout and power-button-press?

    - by Nick
    Hi, my app does something when the screen goes black, but I want it to only carry out that task if the screen was turned off "by itself", through a screen timeout - NOT when the user presses the power-button. Is there any way to distinguish between those two events? ACTION_SCREEN_OFF obviously fires in both cases, and I haven't found any other intents that might match what I'm looking for. Thanks for your help, Nick

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  • How to represent a Many-To-Many relationship in XML or other simple file format?

    - by CSharperWithJava
    I have a list management appliaction that stores its data in a many-to-many relationship database. I.E. A note can be in any number of lists, and a list can have any number of notes. I also can export this data to and XML file and import it in another instance of my app for sharing lists between users. However, this is based on a legacy system where the list to note relationship was one-to-many (ideal for XML). Now a note that is in multiple lists is esentially split into two identical rows in the DB and all relation between them is lost. Question: How can I represent this many-to-many relationship in a simple, standard file format? (Preferably XML to maintain backwards compatibility)

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  • Adding on touch event to images inside gridview

    - by Steve
    I have a gridview where each item has a image and a textview (an app), i added the onItemClick to the gridview in order to launch the app, i also removed the orange selection and made selector in xml so when pressed the text would change to grey and on release it would return to white. My problem is that i need the image to apply an alpha value when pressed and restore the previous alpha on release i tested a lot of ways and none did worked correctly. I came close with the updated answer from the autor of the question: How to set alpha value for drawable in a StateListDrawable?, but some how the state pressed never gets called, i don´t know if this is because i am using the onitemClick to launch the app or not. Also i since i can´t define the alpha on imageview xml i don´t know what else to do Any help will be appreciated

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  • How do I animate View.setVisibility(GONE)

    - by MrSnowflake
    I want to make an Animation for when a View gets it's visibility set to GONE. Instead of just dissapearing, the View should 'collapse'. I tried this with a ScaleAnimation but then the View is collapse, but the layout will only resize it's space after (or before) the Animation stops (or starts). How can I make the Animation so that, while animating, the lower Views will stay directly below the content, instead of having a blank space?

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  • Adding a Main Menu to a Game in Xcode

    - by MasenB
    I am about done with an Objective - C Sprite Kit Development course on Lynda, and I wanted to expand on the app the course had me make! It was made so that once I open the app, it started brick breaker, and then there are more classes for additional scenes like Game Over and Restart! I was wondering if someone could tell me how to make a Main Menu view controller that came before the Brick Breaker screen! Thanks, Masen

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  • I want to retrieve check items of list view

    - by kamil
    for(int i=0;i < users.size();i++) { map = new HashMap<String, String>(); map.put("id",String.valueOf(i)); map.put("userID", String.valueOf(users.get(i).getUserId())); map.put("emailID", users.get(i).getEmailAddress()); memList.add(map); } ListAdapter adapter = new SimpleAdapter(this, memList , R.layout.member_list_view, new String[] { "emailID" },new int[] { R.id.memTextView}); memberList.setAdapter(adapter); I have to retrieve the checked items on a separate button listener. how can I? I am using a customize list view. Plz help...

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  • Supress the Soft Keboard when an activity loads... yet again

    - by tunneling
    this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); Same problem that I've read on other posts. I don't want the soft keyboard to pop up when the Activity loads. The above code snippet works, however my View no longer scrolls up so that the User can still see the EditText. It scrolls without this line of code. Any ideas?

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  • How should I think about perspectives and rotation in OpenGL ES?

    - by Omega
    As I start to write rendering code, how do I want to consider my drawing operations? Will they always be relative to a fixed coordinate system on the screen, or does this change based on the camera perspective? The best example I can try to come up with is say I'm at (0,0,0) and I draw a line to (3,3,3). If I change the perspective +1 on the X axis and conduct the same operation, does it happen at (4,3,3), or am I just getting a new view of the line still being made at (3,3,3)? When doing rotation, am I moving the point from which a frustum emanates, or am I moving the rendering underneath?

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  • AnimationDrawable, when does it end?

    - by Syb
    I know there have been several people with the same question. Which is: How do i know when a frame by frame animation has ended? I have not had any useful answer on fora i visited. So i thought, let's see if they know at stackoverflow. But I could not sit still in the mean time, so i made a work around of this, but it does not really work the way i would like it to. here is the code: public class Main extends Activity { AnimationDrawable sybAnimation; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ImageView imageView = (ImageView)findViewById(R.id.ImageView01); imageView.setBackgroundResource(R.anim.testanimation); sybAnimation = (AnimationDrawable) imageView.getBackground(); imageView.post(new Starter()); } class Starter implements Runnable { public void run() { sybAnimation.start(); long totalDuration = 0; for(int i = 0; i< sybAnimation.getNumberOfFrames();i++){ totalDuration += sybAnimation.getDuration(i); } Timer timer = new Timer(); timer.schedule(new AnimationFollowUpTimerTask(R.id.ImageView01, R.anim.testanimation_reverse),totalDuration); } } class AnimationFollowUpTimerTask extends TimerTask { private int id; private int animationToRunId; public AnimationFollowUpTimerTask(int idOfImageView, int animationXML){ id = idOfImageView; animationToRunId = animationXML; } @Override public void run() { ImageView imageView = (ImageView)findViewById(id); imageView.setBackgroundResource(animationToRunId); AnimationDrawable anim = (AnimationDrawable) imageView.getBackground(); anim.start(); } } basically I make a timertask which is scheduled with the same time as the animation to take. In that run() I want to load a new animation into the imageView and start that animation, this however does not work. Does anyone know how to get this to work, or even better, have a better way to find out when an AnimationDrawable has ended its animation?

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  • menuitem id in xml format can't be an integer? huh. really?

    - by misbell
    ok, in menu.add, you add an integer menuitem id. But when you specify the menu in xml, @+id can't take an integer, so you can't test the id for the menu item as an integer in a switch statement. What obvious thing am I missing, because surely an inconsistency this bone-stupid couldn't have passed muster with all those wonderful geniuses at Google. on top of that, when I give the menu item a name like "@+id/myMenuItem", item.getItemId() returns an integer, a long one, which I guess is a representation of the hex pointer. M

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  • How to -accurately- measure size in pixels of text being drawn on a canvas by drawTextOnPath()

    - by Nick
    I'm using drawTextOnPath() to display some text on a Canvas and I need to know the dimensions of the text being drawn. I know this is not feasible for paths composed of multiple segments, curves, etc. but my path is a single segment which is perfectly horizontal. I am using Paint.getTextBounds() to get a Rect with the dimensions of the text I want to draw. I use this rect to draw a bounding box around the text when I draw it at an arbitrary location. Here's some simplified code that reflects what I am currently doing: // to keep this example simple, always at origin (0,0) public drawBoundedText(Canvas canvas, String text, Paint paint) { Rect textDims = new Rect(); paint.getTextBounds(text,0, text.length(), textDims); float hOffset = 0; float vOffset = paint.getFontMetrics().descent; // vertically centers text float startX = textDims.left; / 0 float startY = textDims.bottom; float endX = textDims.right; float endY = textDims.bottom; path.moveTo(startX, startY); path.lineTo(endX, endY); path.close(); // draw the text canvas.drawTextOnPath(text, path, 0, vOffset, paint); // draw bounding box canvas.drawRect(textDims, paint); } The results are -close- but not perfect. If I replace the second to last line with: canvas.drawText(text, startX, startY - vOffset, paint); Then it works perfectly. Usually there is a gap of 1-3 pixels on the right and bottom edges. The error seems to vary with font size as well. Any ideas? It's possible I'm doing everything right and the problem is with drawTextOnPath(); the text quality very visibly degrades when drawing along paths, even if the path is horizontal, likely because of the interpolation algorithm or whatever its using behind the scenes. I wouldnt be surprised to find out that the size jitter is also coming from there.

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  • AlarmManager Calling Function in Same Class

    - by jsc123
    I am trying to give a LocationClient a two-minute period to connect before calling getLastLocation on it. Initially I implemented this with a Timer (and TimerTask), but because Timers do not work in sleepmode, I would like to translate it to an AlarmManager. However, I am a bit confused as to how to do this, considering an AlarmManager calls another class, whereas I want to remain in the same class and simply delay for a two-minute period. This is how it looks with a Timer. Timer theTimer = new Timer(); theTimer.schedule(new TimerTask() { @Override public void run() { if(checkIfGooglePlay() && checkTime()) { getPostLocation(); stopSelf(); mLocationClient.disconnect(); } } }, TWO_MINUTES);

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