Intent 不设置相机参数 [英] Intent does not set the camera parameters

问题描述

我正在从我的应用程序中打开相机应用程序作为外部意图.我正在使用以下代码来调用相机，以下是我的条件:

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. 它应该会打开前置摄像头.
2. 最高画质.
3. 闪光灯必须打开

以下是我的代码:

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，它确实打开了前置摄像头，但没有打开闪光灯，也没有将图片质量设置为高.

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如下所示:

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" />

我有什么遗漏的吗?

推荐答案

很遗憾，在使用带 Intent 的相机时，唯一可以设置的额外参数是

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

这允许您映射相机应用程序将存储图像的位置.

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

Camera Facing Intent extra 有时可以发挥作用:

Camera Facing intent extra can sometimes work:

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

查看 android 源文件，在 Util 类文件中有一些测试"方法，但没有正式记录:

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

(实用程序)

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;
}

而在photomodule中，使用了如下方法:

And in the photomodule, the following method is used:

(照片模块)

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);
    }
}

并且当相机应用初始化拍照模式时，它会调用这个方法来检查使用哪个相机:

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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