CameraPreview.java

package com.CameraPR;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class CameraPreview extends Activity {

private Preview mPreview;

private Button mCaptureButton;

/** Called when the activity is first created. */

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mPreview = (Preview)findViewById(R.id.preview_layer); 

        mCaptureButton = (Button)findViewById(R.id.capture_button);

        mCaptureButton.setOnClickListener(new OnClickListener()

        {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

mPreview.takePicture("MyPhoto", "Photo taken by sample application");

}

        });

    }

    protected void onResume()

{

super.onResume();

mPreview.openCamera();

}

protected void onPause()

{

super.onPause();

mPreview.releaseCamera();

}

private static final int MENU_SWITCH_CAM = 0;

public boolean onCreateOptionsMenu(Menu menu)

{

menu.add(0,MENU_SWITCH_CAM,Menu.NONE,"카메라 전환");

return true;

}

public boolean onOptionsItemSelected(MenuItem item)

{

switch(item.getItemId())

{

case MENU_SWITCH_CAM:

mPreview.switchCamera();

return true;

}

return false;

}

}

Preview.java

package com.CameraPR;

import java.io.IOException;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.hardware.Camera;

import android.hardware.Camera.CameraInfo;

import android.hardware.Camera.PictureCallback;

import android.hardware.Camera.Size;

import android.os.Bundle;

import android.provider.MediaStore;

import android.util.AttributeSet;

import android.util.Log;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Toast;

public class Preview extends ViewGroup implements SurfaceHolder.Callback {

private static final String TAG = "Preview";

SurfaceView mSurfaceView;

SurfaceHolder mHolder;

Size mPreviewSize;

List<Size> mSupportedPreviewSizes;

Camera mCamera;

int camCount;

int currCamIdx = 0;

Context mContext;

private void init(Context context)

{

mSurfaceView = new SurfaceView(context);

addView(mSurfaceView);

mHolder = mSurfaceView.getHolder();

mHolder.addCallback(this);

mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

camCount = Camera.getNumberOfCameras();

CameraInfo info = new CameraInfo();

for(int i =0; i<camCount; i++)

{

Camera.getCameraInfo(i, info);

if(info.facing == CameraInfo.CAMERA_FACING_BACK)

currCamIdx = i;

}

mContext = context;

}

Preview(Context context) {

super(context);

init(context);

// TODO Auto-generated constructor stub

}

public Preview(Context context, AttributeSet attrs, int defStyle)

{

super(context,attrs,defStyle);

init(context);

}

public Preview(Context context, AttributeSet attrs)

{

super(context, attrs);

init(context);

}

public void takePicture(final String title, final String description)

{

mCamera.takePicture(null, null,new PictureCallback()

{

public void onPictureTaken(byte[] data, Camera camera)

{

Bitmap picture = BitmapFactory.decodeByteArray(data, 0, data.length);

MediaStore.Images.Media.insertImage(mContext.getContentResolver(),

picture, title, description);

Toast.makeText(mContext, "이미지가 저장 되었습니다.", Toast.LENGTH_SHORT).show();

mCamera.startPreview();

}

});

}

public void openCamera()

{

mCamera = Camera.open(currCamIdx);

preparePreviewSize();

}

public void preparePreviewSize()

{

mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();

mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes,getResources().getDisplayMetrics().widthPixels

,getResources().getDisplayMetrics().heightPixels);

}

public void switchCamera()

{

releaseCamera();

currCamIdx = (++currCamIdx)%camCount;

setCamera(Camera.open(currCamIdx));

try{

mCamera.setPreviewDisplay(mHolder);

}catch(IOException exception)

{

Log.e(TAG,"IOException caused by setPreviewDisplay()",exception);

}

Camera.Parameters parameters = mCamera.getParameters();

parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);

mCamera.setParameters(parameters);

mCamera.startPreview();

requestLayout();

}

public void releaseCamera()

{

if(mCamera != null)

{

mCamera.startPreview();

mCamera.release();

mCamera = null;

}

}

public void setCamera(Camera camera)

{

mCamera = camera;

preparePreviewSize();

}

@Override

protected void onLayout(boolean changed, int l, int t, int r, int b) {

// TODO Auto-generated method stub

if(getChildCount() > 0)

{

final View child = getChildAt(0);

final int width = r- l;

final int height = b - t;

int previewWidth = width;

int previewHeight = height;

if(mPreviewSize != null)

{

previewWidth = mPreviewSize.width;

previewHeight = mPreviewSize.height;

}

if(width * previewHeight > height * previewWidth)

{

final int scaledChildWidth = previewWidth * height / previewHeight;

child.layout((width - scaledChildWidth)/2, 0, (width + scaledChildWidth)/2, height);

}else

{

final int scaledChildHeight = previewHeight * width / previewWidth;

child.layout(0, (height - scaledChildHeight)/2, width, (height + scaledChildHeight));

}

}

}

private Size getOptimalPreviewSize(List<Size> sizes, int w, int h)

{

final double ASPECT_TOLERANCE = 0.1;

double targetRatio = (double)w/h;

if(sizes == null) return null;

Size optimalSize = null;

double minDiff = Double.MAX_VALUE;

int targetHeight = h;

for(Size size : sizes)

{

double ratio = (double)size.width/ size.height;

if(Math.abs(ratio - targetRatio)>ASPECT_TOLERANCE)

continue;

if(Math.abs(size.height - targetHeight)<minDiff)

{

optimalSize = size;

minDiff = Math.abs(size.height - targetHeight);

}

}

if(optimalSize == null)

{

minDiff = Double.MAX_VALUE;

for(Size size : sizes)

{

if(Math.abs(size.height - targetHeight)<minDiff)

{

optimalSize = size;

minDiff = Math.abs(size.height - targetHeight);

}

}

}

return optimalSize;

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

// TODO Auto-generated method stub

if(mCamera != null)

{

Camera.Parameters parameters = mCamera.getParameters();

parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);

mCamera.setParameters(parameters);

mCamera.startPreview();

}

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

// TODO Auto-generated method stub

try {

if(mCamera != null)

{

mCamera.setPreviewDisplay(holder);

}

}catch(IOException exception)

{

Log.e(TAG,"IOException caused by setPreviewDisplay()",exception);

mCamera.release();

mCamera = null;

}

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

// TODO Auto-generated method stub

if(mCamera != null)

{

mCamera.stopPreview();

}

}

}

CameraPR.java 이게 메인파일입니다.

package com.CameraPR;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class CameraPR extends Activity {

private static final int PICK_FROM_ALBUM = 1;

protected static final int PICK_FROM_CAMERA = 0;

private Button cameraButton;

private Button lilbraryButton;

CameraPreview CPreview;

ImageEdit IEdit;

Activity act = this;

    @Override

    public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        cameraButton = (Button)findViewById(R.id.btn1);

    cameraButton.setOnClickListener(new OnClickListener()

    {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

doTakePictureAction();

}

    });

    lilbraryButton = (Button)findViewById(R.id.btn2);

    lilbraryButton.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

doTakeAlbumAction();

}

    });

    }

    private void doTakeAlbumAction()

{

// 앨범 호출

Intent intent = new Intent(Intent.ACTION_PICK);

intent.setType(android.provider.MediaStore.Images.Media.CONTENT_TYPE);

startActivityForResult(intent, PICK_FROM_ALBUM);

}

    private void doTakePictureAction()

    {

    Intent intent = new Intent(act,CameraPreview.class);

    act.startActivityForResult(intent, PICK_FROM_CAMERA);

    }

}

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