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POonDraw(Canvas canvas) never reached?
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copied!<p>Can anyone help, my app does not seem to do the onDraw() in the GraView class, even if .invalidate is called upon from either inside or outside the class. I managed to figure out with system.err that it does invalidate the view, however it never gets in the onDraw( ), even though the rest of the app keeps running. I found a lot of solutionssuggesting putting setWillNotDraw(false) in the constructor, but that did not solve anything.</p> <p>GravIO.java File:</p> <pre><code>package dabawi.gravitas; import android.app.Activity; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; public class GravIO extends Activity implements Runnable, OnTouchListener { public final static int clock = 1000; private GravEngine engine; private GraView TV; private SensorManager mSensorManager; private Sensor mSensor; private Thread t1; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); t1 = new Thread(this); t1.start(); engine = new GravEngine(); TV = new GraView(this, engine); setContentView(TV); TV.setOnTouchListener(this); TV.setVisibility(View.VISIBLE); //mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); System.err.println("Starting Engine") ; run(); } @Override public void run() { while (true) { try { System.err.println("Tik") ; engine.tick(); TV.invalidate(); Thread.sleep(GravIO.clock); } catch (InterruptedException ex) { System.err.println("faal"); } } } @Override public boolean onTouch(View view, MotionEvent event) { engine.switchGravity(); return true; } } </code></pre> <p>GraView.java File:</p> <pre><code>package dabawi.gravitas; import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.Display; import android.view.View; import android.view.WindowManager; @SuppressLint({ "DrawAllocation", "ViewConstructor" }) public class GraView extends View { private GravEngine engine; private int screenWidth, screenHeight, ySpace = 5, xSpace, scale; private Paint paint; private int xLoc, yLoc; private boolean xWall = false, yWall = false; public GraView(Context context, GravEngine engine) { super(context); setWillNotDraw(false); this.engine = engine; calcScale(context); } @Override // We think the problem is with this method, that it is never called upon. public void onDraw(Canvas canvas) { super.onDraw(canvas); System.err.println("Calculating position"); calcPos(); canvas = new Canvas(); // drawing background paint = new Paint(); paint.setStyle(Paint.Style.FILL); paint.setColor(Color.WHITE); canvas.drawPaint(paint); drawGame(canvas); } private void drawGame(Canvas canvas) { drawRoom(canvas); drawPlayer(canvas); } @SuppressWarnings("deprecation") private void calcScale(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); Display d = wm.getDefaultDisplay(); screenWidth = d.getWidth(); screenHeight = d.getHeight(); scale = screenHeight / ySpace; xSpace = screenWidth / scale; } private void calcPos() { xLoc = (engine.getxPlayer() / GravEngine.roomScaling); yLoc = (engine.getyPlayer() / GravEngine.roomScaling); if (xLoc < (xSpace + 1) / 2) { xLoc = (xSpace + 1) / 2; xWall = true; } else if (xLoc > (GravRoom.xSize - ((xSpace + 1) / 2))) { xLoc = GravRoom.xSize - ((xSpace + 1) / 2); xWall = true; } else { xWall = false; } if (yLoc < (ySpace + 1) / 2) { yLoc = (ySpace + 1) / 2; yWall = true; } else if (yLoc > (GravRoom.xSize - ((ySpace + 1) / 2))) { xLoc = GravRoom.ySize - ((ySpace + 1) / 2); yWall = true; } else { yWall = false; } } private void drawPlayer(Canvas canvas) { float xPos = engine.getxPlayer() / GravEngine.roomScaling, yPos = engine .getyPlayer() / GravEngine.roomScaling; if (xWall) { } if (yWall) { } paint.setColor(Color.BLUE); int left = (int) (xPos * scale), top = (int) (yPos * scale); int right = left + (GravEngine.pxSize / GravEngine.roomScaling) * scale; int bot = top + (GravEngine.pySize / GravEngine.roomScaling) * scale; canvas.drawRect(left, top, right, bot, paint); } private void drawRoom(Canvas canvas) { for (int i = 0, x = xLoc - ((xSpace + 1) / 2); i < xSpace + 1; x++, i++) { for (int j = 0, y = yLoc - ((ySpace + 1) / 2); i < ySpace + 1; y++, j++) { drawRoomPart(x,y,i,j,canvas); } } } private void drawRoomPart(int x, int y, int i, int j, Canvas canvas) { if (x >= 0 && y >= 0 && x < GravRoom.xSize && y < GravRoom.ySize) { short type = engine.getRoom(engine.getCurrentRoom()).getGridPos(x,y); if (type != 0) { drawBlock(canvas, i, x, j, y, type); } } } private void drawBlock(Canvas canvas, int i, int x, int j, int y, short type) { int left = i * scale, top = y * scale; int right = left + scale; int bot = top + scale; paint.setColor(colorBlock(type)); canvas.drawRect(left, top, right, bot, paint); System.err.println("Left" + left + " top: " + top + " right: " + right + " bot: " + bot); } private int colorBlock(short type) { if (type == 1) { return Color.DKGRAY; } else if (type == 2) { return Color.CYAN; } else if (type == 3) { return Color.GREEN; } else if (type == 4) { return Color.RED; } else { return Color.MAGENTA; } } // private void imageBlock(short type) { // // } } </code></pre>

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