Android Camera

Understanding basic classes of Camera Intent and API

There are mainly four classes that we are going to discuss.

1. Intent

By the help of 2 constants of MediaStore class, we can capture picture and video without using the instance of Camera class.

1. ACTION_IMAGE_CAPTURE
2. ACTION_VIDEO_CAPTURE

2. Camera

It is main class of camera api, that can be used to take picture and video.

3. SurfaceView

It represents a surface view ore preview of live camera.

4. MediaRecorder

It is used to record video using camera.

Android camera app example by camera intent

1. activity_main.xml

File: activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  
  
   <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentBottom="true"  
        android:layout_centerHorizontal="true"  
        android:text="Take a Photo" >  
    </Button>  
  
    <ImageView  
        android:id="@+id/imageView1"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:layout_above="@+id/button1"  
        android:layout_alignParentTop="true"  
        android:src="@drawable/ic_launcher" >  
    </ImageView>  
</RelativeLayout>

2. Activity class

File: MainActivity.java

import android.app.Activity;  
import android.content.Intent;  
import android.graphics.Bitmap;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.View;  
import android.widget.Button;  
import android.widget.ImageView;  
  
public class MainActivity extends Activity {  
     private static final int CAMERA_REQUEST = 1888;  
     ImageView imageView;  
     public void onCreate(Bundle savedInstanceState) {  
  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.activity_main);  
  
         imageView = (ImageView) this.findViewById(R.id.imageView1);  
         Button photoButton = (Button) this.findViewById(R.id.button1);  
  
         photoButton.setOnClickListener(new View.OnClickListener() {  
  
         @Override  
         public void onClick(View v) {  
              Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);  
              startActivityForResult(cameraIntent, CAMERA_REQUEST);  
         }  
        });  
       }  
  
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
      if (requestCode == CAMERA_REQUEST) {  
       Bitmap photo = (Bitmap) data.getExtras().get("data");  
       imageView.setImageBitmap(photo);  
      }  
   }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.activity_main, menu);  
        return true;  
    }  
  
} 

OUTPUT :