我有一個表面視圖來顯示來自IP攝像機的MJPEG流。除了一種情況,它工作得很好。SurfaceView內容與FLAG_TURN_SCREEN_ON活動不可見
在我的活動,顯示了surfaceview我有以下標誌:
WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
如果我正常啓動活動(從應用程序),它顯示的攝像機圖像。但是,如果我在手機處於睡眠狀態時從後臺服務開始活動,則會啓動活動,手機已解鎖,屏幕已打開,一切都看起來不錯,除非Surfaceview上沒有繪製任何內容。 MJPEG流開始正確接收,並且似乎將其繪製在畫布上,但沒有顯示任何內容。如果我旋轉手機,圖片就會顯示出來,從這時起一切正常。
我試着把相關的代碼片放在這裏,但如果你需要別的東西,我也會把它放在這裏。 MjpegView.class是網上找到的類(在這裏也看到了Stackoverflow中的代碼),我對它做了一些細微的修改(主要是在MjpegInputStream中)。
繪圖代碼在一個單獨的線程:
while (mRun && mIn != null)
{
if (surfaceDone)
{
try
{
try
{
bm = mIn.readMjpegFrame();
}
catch (IOException e1)
{
bm = null;
}
if (bm == null) continue;
c = mSurfaceHolder.lockCanvas();
synchronized (mSurfaceHolder)
{
destRect = destRect(bm.getWidth(), bm.getHeight());
c.drawColor(Color.BLACK);
c.drawBitmap(bm, null, destRect, p);
if (requestscreenshot)
{
requestscreenshot = false;
try
{
FileOutputStream out = new FileOutputStream(requestfile);
bm.compress(Bitmap.CompressFormat.PNG, 90, out);
}
catch (Exception ex)
{
// ignore
}
requestfile = "";
}
if (showFps)
{
p.setXfermode(mode);
if (ovl != null)
{
// false indentation to fix forum layout
height = ((ovlPos & 1) == 1) ? destRect.top : destRect.bottom - ovl.getHeight();
width = ((ovlPos & 8) == 8) ? destRect.left : destRect.right - ovl.getWidth();
c.drawBitmap(ovl, width, height, null);
}
p.setXfermode(null);
frameCounter++;
if ((System.currentTimeMillis() - start) >= 1000)
{
fps = String.valueOf(frameCounter) + "fps";
frameCounter = 0;
start = System.currentTimeMillis();
ovl = makeFpsOverlay(overlayPaint);
}
}
}
}
finally
{
if (c != null) mSurfaceHolder.unlockCanvasAndPost(c);
}
}
else
{
try
{
Thread.sleep(100);
}
catch (Exception ex)
{
}
}
}
然後在surfaceview回調:
public void surfaceChanged(SurfaceHolder holder, int f, int w, int h)
{
Log.d(Constants.TAG, "MjpegView.surfaceChanged");
if (thread != null)
{
thread.mSurfaceHolder = holder;
thread.setSurfaceSize(w, h);
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
Log.d(Constants.TAG, "MjpegView.surfaceDestroyed");
surfaceDone = false;
stopPlayback();
}
public void surfaceCreated(SurfaceHolder holder)
{
Log.d(Constants.TAG, "MjpegView surfaceCreated");
surfaceDone = true;
}
public void startPlayback()
{
if (thread == null)
{
thread = new MjpegViewThread(getHolder(), context);
if (URL != null)
{
mRun = true;
thread.start();
}
}
else
{
thread.mSurfaceHolder = getHolder();
}
}
public void stopPlayback()
{
mRun = false;
boolean retry = true;
while (retry && thread != null)
{
try
{
thread.join();
retry = false;
}
catch (InterruptedException e)
{
}
}
thread = null;
}
在活動中我在OnCreate只使用一些初始化:
mv.setSource(device.getCameraURL());
mv.setMessageHandler(messageHandler);
mv.setDisplayMode(MjpegView.SIZE_BEST_FIT);
mv.showFps(false);
(其中mv是MjpegView)
而在onResume我稱之爲MjpegView的startPlayback方法
這就是我的想法。
感謝任何幫助!謝謝!
更新:
魔法門發現周圍的工作:
PowerManager pm = (PowerManager) MjpegtestActivity.this.getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE | PowerManager.ACQUIRE_CAUSES_WAKEUP, Constants.TAG);
wl.acquire();
Intent intent = new Intent(MjpegtestActivity.this, Camera.class);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("PLAYSOUND", false);
intent.putExtra("DEVICEID", "a73d3ffd-bebb-aae4-f133-39a81eba6e");
MjpegtestActivity.this.startActivity(intent);
wl.release();
wl = null;
如果我開始活動得到一個激活鎖定後,正確地顯示在surfaceview的IP攝像機圖像。
但我不知道爲什麼:)