Android自定义相机缩放后冻结

Question

我有一个自定义相机，在某些设备中可以正常工作。它在三星Galaxy Gran Duos（三星gt i9082，安卓4.2.2）上运行良好，但当我试图拍摄之前放大的图像时，它会冻结，不会崩溃，唯一的方法就是按下后退按钮。这种情况只发生在三星GalaxyGranDuos。

我用来拍照的代码：

    Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
        try {
        } catch (Exception e) {
            if (flePicture== null){
                Log.d("camera", "Error creating media file, check storage permissions: " +
                        e.getMessage());
                return;
            }
        }
        try {
            FileOutputStream fos = new FileOutputStream(flePicture);
            fos.write(data);
            fos.close();
        } catch (FileNotFoundException e) {
            Log.d("camera", "File not found: " + e.getMessage());
        } catch (IOException e) {
            Log.d("camera", "Error accessing file: " + e.getMessage());
        } 
    }
};

用于放大的代码：

private void zoomIn() {
    if (pblnInPreview) {
        Camera.Parameters parameters = camCamera.getParameters();
        if ((parameters.getZoom() + 1) < parameters.getMaxZoom()) {
            parameters.setZoom(parameters.getZoom() + 1);
            camCamera.setParameters(parameters);
        }
    }
}

LogCat:

04-07 17:21:14.386: E/BrcmCamera(130): processControlBuffer: Corrupt stream error raised by camera - sensor communication failure

Answer 1

我认为您需要通过使用camera.isZoomSupported()确认您的相机支持变焦，然后如果支持，则需要使用camera.cancelAutoFocus()取消自动对焦以防止图像失真。但只有当你的设备真的支持缩放时，这才有效。如果没有，您需要捕获保持图像，然后使用Bitmap.createBitmap放大您想要的部分。

Answer 2

这不是强相关的答案。我知道。

但我想说的是，三星4.2.2存在许多缺陷问题。它有ClipboardManager崩溃、ActionBar-AppCompat崩溃等等

只需使用简单的if子句进行过滤，即可挽救您的生命。

if (Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN_MR1 && Build.MANUFACTURER.toUpperCase().contains("SAMSUNG")){
    // ignore
}else{
    // your logic on the go
}

Answer 3

拍照后是否再次开始相机预览？

添加此camera.startPreview();

试试这个

     Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
           camera.startPreview();
        try {
        } catch (Exception e) {
            if (flePicture== null){
                Log.d("camera", "Error creating media file, check storage permissions: " +
                        e.getMessage());
                return;
            }
        }
        try {
            FileOutputStream fos = new FileOutputStream(flePicture);
            fos.write(data);
            fos.close();
        } catch (FileNotFoundException e) {
            Log.d("camera", "File not found: " + e.getMessage());
        } catch (IOException e) {
            Log.d("camera", "Error accessing file: " + e.getMessage());
        } 
    }
};

Answer 4

这是特定类型内核的一些问题。

试试这种方法。

private static final String TAG = Test.class.getSimpleName();
private boolean isPreviewStarted;
private Camera camera;
Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
        // check if this needs to stop the preview
        if (deviceNeedsStopPreviewToShoot()) {
            stopPreview();
        }
        // save your image
        // restart preview if needed.
        startPreview();
    }
};
public void startPreview() {
    if (!isPreviewStarted && camera != null) {
        camera.startPreview();
        isPreviewStarted = true;
    }
}
public void stopPreview() {
    if (isPreviewStarted && camera != null) {
        camera.stopPreview();
        isPreviewStarted = false;
    }
}
public static boolean deviceNeedsStopPreviewToShoot() {
    String[] oldDevices = {"smdk4210", "aries"};
    boolean needs = Arrays.asList(oldDevices).contains(Build.BOARD);
    Log.e(TAG, "Device " + Build.BOARD + (needs ? " needs " : " doesn't need ") + "to stop preview");
    return needs;
}