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POinvalidate() not resulting in a onDraw() call
 

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  1. POinvalidate() not resulting in a onDraw() call
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    <p>I'm working on a simple game engine and am having a view invalidate() issue. Basically, when I try to invalidate() the view from any where but default Activity methods if fails to call onDraw(). Any ideas?</p> <pre><code>public class GameActivity extends Activity { //Name for my app String sTag = "CloneOut"; //Variable to point to my view View myView; //Variable controlling the running of the game boolean bRunning = true; //Fixed framerate variables long desiredFramerate = 1; long targetTimeMillis; //Creates a new MusicManager object to handle all music MusicManager mp = new MusicManager(this); //Creates a new SoundEffectManager object to handle all sound effects SoundEffectManager sp = new SoundEffectManager(this); //Create new int variables to hold SoundEffectManager sound ids //int iBeer; //Create an array of bitmaps to store all the actors in the game Bitmap[] actor = new Bitmap[10]; //Automatically called when an activity begins @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Critical line that sets teh view of this activity to BitmapView and // thus BitmapView.draw is called to repaint the view setContentView(new BitmapView(this)); // Show the Up button in the action bar. setupActionBar(); myView = findViewById(android.R.id.content); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) private void setupActionBar() { //Action bar only exists in API 11+ so check before displaying if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) { getActionBar().setDisplayHomeAsUpEnabled(true); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.game, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // This ID represents the Home or Up button. In the case of this // activity, the Up button is shown. Use NavUtils to allow users // to navigate up one level in the application structure. For // more details, see the Navigation pattern on Android Design: // // http://developer.android.com/design/patterns/navigation.html#up-vs-back // NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } class BitmapView extends View { public BitmapView(Context context) { super(context); } @Override public void onDraw(Canvas canvas) { //Writes an informational message to the LogCat window Log.i(sTag,"Drawing"); //Draw the background first canvas.drawColor(Color.BLACK); //Draw all the actors in the game canvas.drawBitmap(actor[0], 500, 100, null); } } //----------------------------------------------------------------------------------------- //Game Engine Code Start //----------------------------------------------------------------------------------------- //The following methods run automatically in this order // onCreate() - Call immediately on starting an activity // onStart() // onResume() - Called when the activity starts interacting with the user public void onResume() { super.onResume(); //Populate the first actor with the paddle actor[0] = BitmapFactory.decodeResource(getResources(), R.drawable.paddle); //Calculate the time at which to render the next frame targetTimeMillis = System.currentTimeMillis() + (1000 / desiredFramerate); //Start the game running GameLoop(); } public void GameLoop() { while (bRunning) { CheckFramerate(); } } public void CheckFramerate() { if (System.currentTimeMillis() &gt; targetTimeMillis) { //Calculate the time at which to render the next frame targetTimeMillis = System.currentTimeMillis() + (1000L / desiredFramerate); //Writes an informational message to the LogCat window Log.i(sTag,"Renderframe"); RenderFrame(); } } //Invalidates the entire view and thus forces a redraw of the screen public void RenderFrame() { //Writes an informational message to the LogCat window Log.i(sTag,"Inside Renderframe"); myView.invalidate(); } } </code></pre>
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    1. PTQuestion
    1. USAbdulsattar Mohammed
    1. USMichael
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      1. POinvalidate() not resulting in a onDraw() call
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      1. VTUpMod
    1. COTry this: setWillNotDraw(false);
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      1. POinvalidate() not resulting in a onDraw() call
      1. USuser1888162
    2. COAdded setWillNotDraw(false) in the BitmapView constructor, but still nothing. Thanks for the suggestion...any other ideas?
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      1. POinvalidate() not resulting in a onDraw() call
      1. USMichael
    3. COFigured it out. According to the Threading documents you should never clog/block the main/ui thread which I was doing with the While(bRunning) loop. Instead this loop should be performed in the background to free up the main/ui loop to do other housekeeping chores. Hope this helps others.
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      1. POinvalidate() not resulting in a onDraw() call
      1. USMichael
 

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