Android Tutorial: CameraView with layar

 

 

 

 

 

In this Android tutorial we will launch the Camera and display an image in the CameraView. We will use the following Android programming concepts:

  • SurfaceView and SurfaceHolder to set the CameraView as part of our MainActivity
  • Seperate overlay.xml to set the image which we wan to display in the CameraView.

First we create 2 layout files (1) the layout which holds the SurfaceView and (2) the layout which hold the image we want to display.

Open you Activity_Main.xml and set a SurfaceView as a child of your LinearLayout.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<SurfaceView
	android:id="@+id/cameraview"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

Secondly create a new layout in your resources folder and name it overlay.xml and simple add an ImageView in this layout. This ImageView will hold the image your want to display in your CameraView.

<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	 android:orientation="vertical"
	 android:layout_width="fill_parent"
	 android:layout_height="fill_parent"
	 android:gravity="bottom">
	
	    <ImageView
	        android:id="@+id/imageView1"
	        android:layout_width="wrap_content"
	        android:layout_height="wrap_content"
	        android:layout_gravity="center_horizontal"
	        android:src="@drawable/ringimage" />
	
	</LinearLayout>

Now you have set your layout, you can open the MainActivity.java.

  • We set the MainActivity to our layout (Activity_Main.xml) and set the ScreenLayout to Horizontal.
  • Create a SurfaceView and set it to your cameraview which you created in your Activity_Main layout.
  • Implement the SurfaceHolder which holds this cameraviev

Next we need to inflate the Image we set in our overlay.xml.

  • Call the LayoutInflater
  • Set your LayoutInflater to your image (in my case overlay.xml which holds the ImageView)
  • Set some LayoutInflater parameters

Finally we need to set what we want the camera to do in the standard Android SDK methods of the SurfaceView (surfaceCreated, surfaceChanged, surfaceDestroyed).

package com.christianpeeters.ghost;

import java.io.IOException;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;

public class MainActivity extends Activity implements SurfaceHolder.Callback{

Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean cameraview = false;
LayoutInflater inflater = null;

 /** Called when the activity is first created. */
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	     super.onCreate(savedInstanceState);
	     setContentView(R.layout.activity_main);
	     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

	     getWindow().setFormat(PixelFormat.UNKNOWN);
	     surfaceView = (SurfaceView)findViewById(R.id.cameraview);
	     surfaceHolder = surfaceView.getHolder();
	     surfaceHolder.addCallback(this);
	     surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

	     inflater = LayoutInflater.from(getBaseContext());
	     View view = inflater.inflate(R.layout.overlay, null);
	     LayoutParams layoutParamsControl= new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
	     this.addContentView(view, layoutParamsControl);

	 	}

 	@Override
 	public void surfaceChanged(SurfaceHolder holder, int format, int width,
 	int height) {
 		// TODO Auto-generated method stub
		if(cameraview){
		camera.stopPreview();
		cameraview = false;
		}	

		if (camera != null){
		try {
		camera.setPreviewDisplay(surfaceHolder);
		camera.startPreview();
		cameraview = true;
		} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
				}
			}
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		camera = Camera.open();
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
	// TODO Auto-generated method stub
	camera.stopPreview();
	camera.release();
	camera = null;
	cameraview = false;
	}
	}

12 Responses

  1. Tim November 10, 2012 / 12:28 am

    Christian,
    Any reason I’m getting a black screen with my image instead of the camera & the ability to take a picture?
    Thanks,
    Tim

    • Christian November 30, 2012 / 6:03 pm

      Hi Tim, sorry for my late reply. It’s hard to tell. Did you try to copy past my complete code?

    • Ivan January 23, 2014 / 12:13 am

      before “this.addContentView(view, layoutParamsControl);” add view.setVisibility(View.GONE)

      Camera is active but it’s behind new view that’s added

  2. Alberto Gallegos July 16, 2013 / 1:17 am

    Hi, i already do this, but when i add a button to take a picture it doesnt put the image in the photo, do you know what do i have to do to take the picture and that the image appear on the photo
    Best regards

  3. Rudy Hermawan August 6, 2013 / 7:39 am

    thank’s bro :D

    #good Tutorial :)

  4. ROHIT RANJAN August 14, 2013 / 9:04 am

    Thanks a lot for breaking down the code in easily understandable manner !!

  5. uday August 27, 2013 / 2:46 pm

    hi ,
    can any one tell me how to create an camera application which capture only the selected area in the screen i.e a rectangle should be placed in screen to select the object .
    plz giude me

  6. Anonymous September 6, 2013 / 8:27 am

    nice dude help full

  7. Anonymous October 10, 2013 / 8:47 am

    It’s very helpful and easy to understand. Thanks

  8. Reid January 9, 2014 / 11:34 am

    Hi Christian. Great, easy to understand tutorials.
    I tried copying your code and I copied my image into the drawable folders with the name “ringimage.png” but now I get errors “Missing content description on attribute image” for the ImageView and “The method setType(int) from the type SurfaceHolder is deprecated”. How do I fix this?

    • Reid January 9, 2014 / 11:42 am

      Update: I fixed the Missing content description by adding one to strings.xml

  9. Majid January 24, 2014 / 3:29 pm

    Hey could you help me?
    How can i adjust contrast, saturation, color hue in live camera at real time before taking picture programmatically. if anyone have any idea please help me.

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