Les amis,
Je veux créer un arrière-plan sans couture en tant que composant de vue personnalisé.
Le problème, je l'ai découvert pendant le débogage,
La première fois que j'appelle invalidate() dans le thread, ma méthode de rappel onDraw est appelée. Les autres fois où mon thread appelle invalidate(), la méthode de rappel onDraw n'est pas appelée.
donc il passe juste sur la méthode invalidate(), comme si elle n'existait pas.
L'application affiche le png d'arrière-plan sans couture. Mais comme il est statique, il n'est pas mis à jour.
J'affiche tout mon code parce que le bogue peut se trouver en dehors du fil, là où se trouve invalidate() ou en dehors de la méthode onDraw.
J'apprécie toute forme d'aide, donc THX.
public class MyBringBackSurface extends View implements Runnable {
Bitmap bitmapResource;
int leftFrameX, rightFrameX, startX, stopX, bitmapPixelWidth,
bitmapPixelHight;
int pixelPerFrame = 10;
int framerate = 100;
int threadSleepTime;
int offsetYInPixel = 200;
Thread ourthread = null;
boolean isrunning = false;
Canvas c;
public MyBringBackSurface(Context context) {
super(context);
init();
}
public MyBringBackSurface(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyBringBackSurface(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
// Set up Bitmap Resource
bitmapResource = BitmapFactory.decodeResource(getResources(),
R.drawable.simelessbackground);
// c = new Canvas(bitmapResource);
// Implementing leftFrameX and rightFrameX
leftFrameX = 0;
rightFrameX = bitmapResource.getWidth();
// Calculating the Thread sleep time
threadSleepTime = 1000 / framerate;
}
public void pause() { // destroy the currently running thread because
// anyways in the on resume will be created a
// new one again
isrunning = false;
while (true) {
try { // goes through this thread until our thread died
ourthread.join(); // Blocks the current Thread
// (Thread.currentThread()) until the
// receiver finishes its execution and
// dies.
} catch (InterruptedException e) {
e.printStackTrace();
}
break;
}
}
public void resume() {
isrunning = true;
ourthread = new Thread(this);
ourthread.start();
}
public void run() {
while (isrunning) {
try {
Thread.sleep(threadSleepTime);
// formula is 1000/ sleep time (here 5) = frame rate
} catch (InterruptedException e) {
e.printStackTrace();
}
invalidate();
// Add pixelPerFrame and draw again
leftFrameX = leftFrameX - pixelPerFrame;
rightFrameX = rightFrameX - pixelPerFrame;
// if picture is completely out of the screen, start over again
if (leftFrameX <= -bitmapResource.getWidth()) {
leftFrameX = 0;
rightFrameX = bitmapResource.getWidth();
}
}
}
/**
* Render the text
*
* @see android.view.View#onDraw(android.graphics.Canvas)
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawRGB(255, 255, 255);
// Draw Rectangle 1250 pixel
Rect rect1000 = new Rect();
rect1000.set(0, 0, 1250, 20);
Paint blue = new Paint();
blue.setColor(Color.BLUE);
canvas.drawRect(rect1000, blue);
// Draw first Bitmap
Rect rectBitmapSource = new Rect(0, 0, bitmapResource.getWidth(),
bitmapResource.getHeight());
Rect rectBitmapDestinationFirst = new Rect(leftFrameX, offsetYInPixel,
rightFrameX, offsetYInPixel + bitmapResource.getHeight());
canvas.drawBitmap(bitmapResource, rectBitmapSource,
rectBitmapDestinationFirst, null);
// Draw second Bitmap
Rect rectBitmapDestinationSecond = new Rect(
(leftFrameX + bitmapResource.getWidth()), offsetYInPixel,
(rightFrameX + bitmapResource.getWidth()), offsetYInPixel
+ bitmapResource.getHeight());
canvas.drawBitmap(bitmapResource, rectBitmapSource,
rectBitmapDestinationSecond, null);
}}
