how to take picture from front camera in android programmatically


how to take picture from front camera in android programmatically插图

How to take pictures with camera on Android programmatically?

This example demonstrates how do I take pictures with camera on android programmatically. Step 1 ? Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project. Step 2 ? Add the following code to res/layout/activity_main.xml.

How to show the next picture taken from the camera?

When you close the camera, the picture will be displayed in the image view object under the button. You can take several images, then when you click one image, it will show the next image in the camera taken images list. You can not run this example in the android emulator. You need a physical android device that has a camera. I use Hua Wei mate 8.

How to start camera using intent in Android?

How To Startup Camera Using Intent. First you need create an Intent object with action MediaStore.ACTION_IMAGE_CAPTURE (android.media.action.IMAGE_CAPTURE). Intent cameraIntent = new Intent (MediaStore.ACTION_IMAGE_CAPTURE); Then put the output image Uri as the extra parameter pass to camera activity.

How to share picture files between Android apps?

From Android OS version 7.0 ( SDK version 24 ), you need to use android.support.v4.content.FileProvider class to share files between android apps. Because those picture files are created by the camera app, and only the camera and camera same group users can read them, all other users can only execute them.

What is Camera2?

While it has been available since API level 21, the Camera2 API has got to be one of the more complex pieces of architecture developers have to deal with.

Why use Camera2 API?

The primary reason to use the Camera2 API is if your application requires some custom interaction with the camera or its functionality.

Why is the first callback important?

The first callback is crucial when using the camera. This is because we want to be notified when the SurfaceTexture is available so we can start displaying the feed on it.

What is the object that records video?

To record a video, we need to interact with a new object called MediaRecorder. The media recorder object is in charge of recording audio and video and we will be using it do just that.

What is an image reader?

But what is this ImageReader? Well, an ImageReader provides access to image data that is rendered onto a surface. In our case, it is the surface of the TextureView.

What is the camera manager?

Now, we have the CameraManager. This is a system service that allows us to interact with CameraDevice objects.

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How to tell the camera app the path?

The camera app is responsible for saving the pictures in the above folder. So you should tell the camera app the folder path by using a Uri object. The Uri object is a wrapper of the picture file path. It is used to identify the resource’s ( file ) path uniquely.

What is meta data XML?

The meta-data XML tag specifies the shared file directories in an XML resource file. The file name is shared_file_paths.xml which is saved in the app/res/xml folder, but you can use any file name in your code as you like.

What happens when you close the camera?

When you close the camera, the picture will be displayed in the image view object under the button.You can take several images, then when you click one image, it will show next image in the camera taken images list. You can not run this example in android emulator. You need a physical android device which has camera.

Where are pictures saved after camera app?

After the camera app takes an image, when you close the camera, you can find the picture files are saved by the camera in the app-specific cache directory.

Can all other users read camera files?

Because those picture files are created by the camera app, and only the camera and camera same group users can read them, all other users can only execute them. You can get this conclusion from the camera-taken picture files permission (for example -rwxrwx–x).

Can you run Hua Wei Mate 8 in Android?

You can not run this example in the android emulator. You need a physical android device that has a camera. I use Hua Wei mate 8.