第9讲 在Camera App或Java Framework添加trace - Android Camera性

本讲是Android Camera性能分析专题的第9讲，我们介绍在Camera App或Java Framework添加trace，包括如下内容：

1. Java Trace类说明
2. 实战:在Camera App中添加Trace
3. 实战:在Camera Java Framework中添加Trace

Java Trace类说明

实战:在Camera App中添加Trace

public class GeekCamera2Trace {
    public static final String OPEN_CAMERA = "GC2_openCamera";
    public static final String CREATE_CAPTURE_SESSION = "GC2_createCaptureSession";
    public static final String FRAME_NUMBER = "GC2_FrameNumber";
    public static void beginAsyncSection(String methodName, int cookie) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && Trace.isEnabled()) {
            Trace.beginAsyncSection(methodName, cookie);
        }
    }

    public static void endAsyncSection(String methodName, int cookie) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && Trace.isEnabled()) {
            Trace.endAsyncSection(methodName, cookie);
        }
    }

    public static void beginSection(String sectionName) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&Trace.isEnabled()) {
            Trace.beginSection(sectionName);
        }
    }

    public static void endSection() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&Trace.isEnabled()) {
            Trace.endSection();
        }
    }

    public static void setCounter(String counterName, long counterValue) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&Trace.isEnabled()) {
            Trace.setCounter(counterName, counterValue);
        }
    }
}

实战:在Camera Java Framework中添加Trace

public void openCameraForUid(@NonNull String cameraId,
        @NonNull final CameraDevice.StateCallback callback, @NonNull Executor executor,
        int clientUid, int oomScoreOffset) throws CameraAccessException {
    Log.i(TAG, "v.lmcjl.com openCameraForUid cameraId:" + cameraId);
    Trace.beginSection("GC2_FWK_openCameraForUid");

    if (cameraId == null) {
        throw new IllegalArgumentException("cameraId was null");
    } else if (callback == null) {
        throw new IllegalArgumentException("callback was null");
    }
    if (CameraManagerGlobal.sCameraServiceDisabled) {
        throw new IllegalArgumentException("No cameras available on device");
    }

    openCameraDeviceUserAsync(cameraId, callback, executor, clientUid, oomScoreOffset);
    Trace.endSection();
}

Android模拟器替换image后无法开机怎么办

• https://ask.lmcjl.com/question/50

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