AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest  

      xmlns:android="http://schemas.android.com/apk/res/android"

      package="de.test3d"

      android:versionCode="1"

      android:versionName="1.0">

    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon"  

     android:label="@string/app_name">

        <activity android:name=".StartActivity"

                  android:screenOrientation="landscape"

                  android:label="@string/app_name">

            <intent-filter>

                <action  

                 android:name="android.intent.action.MAIN" />

                <category 

                 android:name="android.intent.category.LAUNCHER"/>

            </intent-filter>

        </activity>

    </application>

    <uses-permission android:name="android.permission.CAMERA" />

    <uses-permission      

     android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-feature android:name="android.hardware.camera" />

    <uses-feature android:name="android.hardware.camera.autofocus" />

</manifest>

main.xml:

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout  

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <de.test3d.LeftCamera

        android:layout_gravity="left"

        android:id="@+id/leftCamera1"

        android:layout_width="640dp"

        android:layout_height="480dp"></de.test3d.LeftCamera>

    <de.test3d.RightCamera

        android:layout_gravity="right"

        android:id="@+id/rightCamera1"

        android:layout_width="640dp"

        android:layout_height="480dp"></de.test3d.RightCamera>

</FrameLayout>

StartActivity.java:

import android.app.Activity;

import android.os.Bundle;

public class StartActivity extends Activity  {

    private LeftCamera leftCameraView = null;   

    private RightCamera rightCameraView = null;   

   

    public void onCreate(Bundle icicle) {

        super.onCreate(icicle);

       

        setContentView(R.layout.main);

       

        leftCameraView = new LeftCamera( 

        this.getApplicationContext(), (LeftCamera)         

        findViewById(R.id.leftCamera1));

        rightCameraView = new RightCamera( 

        this.getApplicationContext(), (RightCamera)  

        findViewById(R.id.rightCamera1));

    }

    @Override

    protected void onPause() {

        super.onPause();

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

    }

}

LeftCamera.java:

import java.io.IOException;

import android.content.Context;

import android.hardware.Camera;

import android.util.AttributeSet;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

public class LeftCamera extends SurfaceView implements SurfaceHolder.Callback {

    private static int CAMERAID = 0;

    public LeftCamera(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    private Camera camera;

    private SurfaceHolder previewHolder;

    private boolean previewRunning;

    public LeftCamera(Context context, SurfaceView surfaceView) {

        super(context);

        previewHolder = surfaceView.getHolder();

        previewHolder.addCallback(this);

        previewHolder.setType( 

        SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

       

    }

    public void surfaceCreated(SurfaceHolder holder) {

        camera = Camera.open(CAMERAID);

        try {

            camera.setPreviewDisplay(holder);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public void surfaceDestroyed(SurfaceHolder holder) {

        this.onStop();

    }

    public void surfaceChanged(SurfaceHolder holder, int format,

    int width, int height) {
        //not really relevant if the surface never changes
        if (previewRunning)

            camera.stopPreview();

   

        Camera.Parameters p = camera.getParameters();

        p.setPreviewSize(width, height);

        camera.setParameters(p);

   

        try {

            camera.setPreviewDisplay(holder);

        } catch (IOException e) {

            e.printStackTrace();

        }

        previewRunning = true;

        camera.startPreview();

    }

    public void onStop() {

        camera.setPreviewCallback(null);

        camera.stopPreview();

        previewRunning = false;

        camera.release();

    }

    public void onResume() {

        camera = Camera.open(CAMERAID);

        previewRunning = true;

    }

}

RightCamera.java (like LeftCamera.java, except that it uses another CameraId):

import java.io.IOException;

import android.content.Context;

import android.hardware.Camera;

import android.util.AttributeSet;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

public class RightCamera extends SurfaceView implements SurfaceHolder.Callback {

    private static int CAMERAID = 4;

    public RightCamera(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    private Camera camera;

    private SurfaceHolder previewHolder;

    private boolean previewRunning;

    public RightCamera(Context context, SurfaceView surfaceView) {

        super(context);

        previewHolder = surfaceView.getHolder();

        previewHolder.addCallback(this);

        previewHolder.setType( 

        SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

       

    }

    public void surfaceCreated(SurfaceHolder holder) {

        camera = Camera.open(CAMERAID);

        try {

            camera.setPreviewDisplay(holder);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public void surfaceDestroyed(SurfaceHolder holder) {

        this.onStop();

    }

    public void surfaceChanged(SurfaceHolder holder, int format,
    int width, int height) { 
        //not really relevant if the surface never changes
        if (previewRunning)

            camera.stopPreview();

   

        Camera.Parameters p = camera.getParameters();

        p.setPreviewSize(width, height);

        camera.setParameters(p);

   

        try {

            camera.setPreviewDisplay(holder);

        } catch (IOException e) {

            e.printStackTrace();

        }

        previewRunning = true;

        camera.startPreview();

    }

    public void onStop() {

        camera.setPreviewCallback(null);

        camera.stopPreview();

        previewRunning = false;

        camera.release();

    }

    public void onResume() {

        camera = Camera.open(CAMERAID);

        previewRunning = true;

    }

   

}