如何通过android中的意图打开前置和后置摄像头? [英] How to Open Front and Back camera through intent in android?

问题描述

我们有意实现摄像头，以使其在micromax480p 5.1版中可以正常工作，但是当我们在Nexus7版本6.1中使用的时候，打开了摄像头，但我想打开一些时间，前后有时可以按照我们的方式打开需要.

We implement camera with intent it's working fine in micromax480p version 5.1 but when we used in Nexus7 version 6.1 by that time camera is opened but i want to open some times Front and somr times Back is it possible to open according to as we need.

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    //intent.addCategory(Intent.CATEGORY_OPENABLE);
    //intent.setAction(Intent.ACTION_GET_CONTENT);
    if(camera == 1) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1) {
            //intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.putExtra("android.intent.extras.CAMERA_FACING", android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT);
            intent.putExtra("android.intent.extras.LENS_FACING_FRONT", 1);
            intent.putExtra("android.intent.extra.USE_FRONT_CAMERA", true);

        } else {
            intent.putExtra("android.intent.extras.CAMERA_FACING", 1);
        }
    }


    // start the image capture Intent
    startActivityForResult(intent, requestCode);

我以前是这样使用的，但是默认情况下它是开放的，这与我们以前使用过的相机(前后)相同.谢谢.对不起，我的英语交流很差.

I used like this but it's open defaultly what ever we used camera(front and back) previously.thanks. sorry for my weak English comm.

推荐答案

打开后退摄像头:-

val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivityForResult(cameraIntent, REQUEST_CODE_CAMERA)

要打开前置摄像头，请执行以下操作:-

To open the front camera:-

val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
when {
     Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1 && Build.VERSION.SDK_INT < Build.VERSION_CODES.O -> {
         cameraIntent.putExtra("android.intent.extras.CAMERA_FACING", CameraCharacteristics.LENS_FACING_FRONT)  // Tested on API 24 Android version 7.0(Samsung S6)
     }
     Build.VERSION.SDK_INT >= Build.VERSION_CODES.O -> {
         cameraIntent.putExtra("android.intent.extras.CAMERA_FACING", CameraCharacteristics.LENS_FACING_FRONT) // Tested on API 27 Android version 8.0(Nexus 6P)
         cameraIntent.putExtra("android.intent.extra.USE_FRONT_CAMERA", true)
     }
     else -> cameraIntent.putExtra("android.intent.extras.CAMERA_FACING", 1)  // Tested API 21 Android version 5.0.1(Samsung S4)
}
startActivityForResult(cameraIntent, REQUEST_CODE_CAMERA)

我无法使其适用于API 28及更高版本.另外，在某些设备中(取决于制造商)无法直接打开前置摄像头.

I could not make it work for API 28 and above. Also, opening the front camera directly is not possible in some devices(depends on the manufacturer).

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