意图不设置照相机参数 [英] Intent does not set the camera parameters

问题描述

我打开摄像头的应用程序从我的应用程序的外部意图。我使用下面的code调用摄像头和下面是我的情况：

I am opening camera app as external intent from my applications. I am using following code to invoke the camera and following are my conditions:

1. 应该打开前置摄像头。
2. 在最高图像质量。
3. 在闪光灯发出的光线要上

以下是我的code：

Intent action = new Intent("android.media.action.IMAGE_CAPTURE");   

        action.putExtra("android.intent.extras.CAMERA_FACING", 1);
        action.putExtra("android.intent.extras.FLASH_MODE_ON", 1);
        action.putExtra("android.intent.extras.QUALITY_HIGH", 1);

现在，它确实开启前置摄像头，但它不打开闪光灯，并没有设置图像质量高。

Now, it does open the front camera BUT it does not turn on the flash and it does not set the picture quality to high.

我的清单文件的权限部分看起来像以下内容：

My Manifest file's permission section looks like following:

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature android:name="android.hardware.camera.flash" />

有什么，我很想念？

is there anything that I am missing?

推荐答案

不幸的是，使用意图相机时，唯一额外的参数可以设置为

Unfortunately, when using the camera with Intent, the only extra parameter you can set is

MediaStore.EXTRA_OUTPUT

例如：

fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name

，它允许你地图，相机应用程序将存储图像。

Which allows you to map where the Camera application will store the image.

摄像机面对额外的意图，有时工作：

Camera Facing intent extra can sometimes work:

action.putExtra("android.intent.extras.CAMERA_FACING", 1);

看在Android源代码文件，还有一些测试方​​法是在的Util类文件，但没有正式记录的：

Looking in the android source files, there are some "test" methods that are in the Util class file but not officially documented:

（的Util）

private static final String EXTRAS_CAMERA_FACING =
        "android.intent.extras.CAMERA_FACING";

// This is for test only. Allow the camera to launch the specific camera.
public static int getCameraFacingIntentExtras(Activity currentActivity) {
    int cameraId = -1;

    int intentCameraId =
            currentActivity.getIntent().getIntExtra(Util.EXTRAS_CAMERA_FACING, -1);

    if (isFrontCameraIntent(intentCameraId)) {
        // Check if the front camera exist
        int frontCameraId = CameraHolder.instance().getFrontCameraId();
        if (frontCameraId != -1) {
            cameraId = frontCameraId;
        }
    } else if (isBackCameraIntent(intentCameraId)) {
        // Check if the back camera exist
        int backCameraId = CameraHolder.instance().getBackCameraId();
        if (backCameraId != -1) {
            cameraId = backCameraId;
        }
    }
    return cameraId;
}

和在photomodule，下面的方法被用于：

And in the photomodule, the following method is used:

（PhotoModule）

(PhotoModule)

private int getPreferredCameraId(ComboPreferences preferences) {
    int intentCameraId = Util.getCameraFacingIntentExtras(mActivity);
    if (intentCameraId != -1) {
        // Testing purpose. Launch a specific camera through the intent
        // extras.
        return intentCameraId;
    } else {
        return CameraSettings.readPreferredCameraId(preferences);
    }
}

和当相机应用程序初始化的照片模式，它调用此方法来检查要使用的摄像头：

And when the camera app initialises the photo mode, it calls this method to check which camera to use:

mCameraId = getPreferredCameraId(mPreferences);

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