大家好，我对 android/glass 开发还很陌生，所以如果我错了，请纠正我。
我试图创建一个很好的高频 Live Card。但是，当我关闭应用程序时，函数 surfaceDestroyed() 没有触发并且 thread.quit() 没有被调用。
我尝试查看示例项目秒表/计时器，显然他们也没有停止线程。根据文档，surfaceDestroyed 在表面被破坏之前被调用，但我的表面是什么？我还读了一些叫做surfaceview的东西，它们是一样的吗？surfaceview 是我的 customview 还是 livecard？
https://developers.google.com/glass/develop/gdk/ui/live-cards#creating_high-frequency_live_cards
感谢任何形式的帮助！！！</p>
/ ***
* LiveCardRender Class
*** /
public class LiveCardRender implements DirectRenderingCallback {
private static final long FRAME_TIME_MILLIS = 33;
private CustomView mCustomView;
private SurfaceHolder mHolder;
private boolean mPaused;
private RenderThread mRenderThread;
private class RenderThread extends Thread {
private boolean mShouldRun;
public RenderThread() {
mShouldRun = true;
}
private synchronized boolean shouldRun() {
return mShouldRun;
}
public synchronized void quit() {
mShouldRun = false;
}
@Override
public void run() {
while (shouldRun()) {
draw(mCustomView);
SystemClock.sleep(FRAME_TIME_MILLIS);
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mHolder = holder;
updateRendering();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mHolder = null;
updateRendering();
}
@Override
public void renderingPaused(SurfaceHolder holder, boolean paused) {
mPaused = paused;
updateRendering();
}
private synchronized void updateRendering() {
boolean shouldRender = (mHolder != null) && !mPaused;
boolean rendering = mRenderThread != null;
if (shouldRender != rendering) {
if (shouldRender) {
mRenderThread = new RenderThread();
mRenderThread.start();
} else {
mRenderThread.quit();
mRenderThread = null;
}
}
}
private void draw(View view) {
Canvas canvas;
try {
canvas = mHolder.lockCanvas();
} catch (Exception e) {
return;
}
if (canvas != null) {
view.draw(canvas);
mHolder.unlockCanvasAndPost(canvas);
}
}
}
/ ***
* LaunchService Class that uses LiveCardRender to update the live card
*** /
public class LaunchService extends Service {
private static final String LIVE_CARD_TAG = "motion_card";
private TimelineManager mTimelineManager;
private LiveCard mLiveCard;
private LiveCardRender mLiveCardRender;
@Override
public void onCreate() {
mTimelineManager = TimelineManager.from(this);
}
public int onStartCommand(Intent intent, int flags, int startId) {
if (mLiveCard == null) {
mLiveCard = mTimelineManager.createLiveCard(LIVE_CARD_TAG);
mLiveCardRender = new LiveCardRender(this);
mLiveCard.setDirectRenderingEnabled(true);
mLiveCard.getSurfaceHolder().addCallback(mLiveCardRender);
mLiveCard.publish(PublishMode.REVEAL);
}
return START_STICKY;
}
@Override
public void onDestroy(){
if (mLiveCard != null && mLiveCard.isPublished()) {
if (mLiveCardRender != null) {
mLiveCard.getSurfaceHolder().removeCallback(mLiveCardRender);
}
mLiveCard.unpublish();
mLiveCard = null;
}
super.onDestroy();
}
}