シンプルなAndroidカメラアプリ

参考：http://androidlab.blog119.fc2.com/blog-entry-21.html

package com.tkado.SimpleCamera;

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;

import java.io.*;
import java.util.Calendar;

// ----------------------------------------------------------------------

public class Camera_test extends Activity {
    private Preview mPreview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Hide the window title.
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        // Create our Preview view and set it as the content of our activity.
        mPreview = new Preview(this);
        setContentView(mPreview);
    }

}

// ----------------------------------------------------------------------

class Preview extends SurfaceView implements SurfaceHolder.Callback {
    SurfaceHolder mHolder;
    Camera mCamera;
    String SD="/sdcard/DCIM/102SC/";  //SDカードの保存先フォルダ

    Preview(Context context) {
        super(context);

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        mCamera = Camera.open();
        try {
           mCamera.setPreviewDisplay(holder);
        } catch (IOException exception) {
            mCamera.release();
            mCamera = null;
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the preview.
        // Because the CameraDevice object is not a shared resource, it's very
        // important to release it when the activity is paused.
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters and begin
        // the preview.
        Camera.Parameters parameters = mCamera.getParameters();
        parameters.setPreviewSize(w, h);
        parameters.setPictureSize(w*2, h*2); //プレビューサイズの2倍の大きさで画像を保存する
        mCamera.setParameters(parameters);
        mCamera.startPreview();
    }

    public boolean onTouchEvent(MotionEvent e){
    	if(e.getAction()==MotionEvent.ACTION_DOWN){
    		Log.d("TEST","X:"+e.getX());
    		Log.d("TEST","Y:"+e.getY());
    	}
    	takePicture();
		return false;
    }

    //写真撮影
    public void takePicture() {
        //カメラのスクリーンショットの取得
        mCamera.takePicture(null,null,new Camera.PictureCallback() {
            public void onPictureTaken(byte[] data,Camera camera) {
                try {
                	mCamera.stopPreview();
                    Log.d("Camera","Take picture");
                    File dirs = new File(SD);
                    if (!dirs.exists()) {
                        dirs.mkdirs();    //make folders
                    }

                    String outputfile=Calendar.getInstance().getTimeInMillis()+".jpg";   //ファイル名が被らないように時間で名前を付ける
					String filename=SD+outputfile;
                    Log.d("Camera", "output:"+filename);
					FileOutputStream fos = null;
					try {
						fos = new FileOutputStream(filename);
						fos.write(data);
					} catch (IOException e) {
						e.printStackTrace();
						mCamera.stopPreview();
	                    mCamera.release();
	                    android.util.Log.e("",""+e.toString());
					} finally {
						fos.close();
						Log.d("Camera", "Done:"+filename);
					}
                    mCamera.startPreview();
                } catch (Exception e) {
                	mCamera.stopPreview();
                    mCamera.release();
                    android.util.Log.e("",""+e.toString());
                }
            }
        });
    }
}

あとはカメラを使うためにAndroidManifest.xmlに

を追加する。
そしてAndroid2.1以下ではカメラが横向き専用のため

と横向き固定にしておく。

カメラで撮って保存するだけなら非常に簡単なのだが
撮ったあとに確認画面を表示したり
プレビュー中の画像に画像処理を加えるのは一癖も二癖もあるみたいで苦戦中