Android カメラに autofocus を実装する。

google先生にお尋ねしても、わかりやすいサイトが
なかったので、書きました。

カメラ部分は木南さんの本を参考にしています。
『Google-Androidアプリケーション開発入門』
ありがとうございます！！
買った方がいいですよ～。

シャッターボタンを押されたときに
Camera.autoFocus(Camera.AutoFocusCallback);
を呼んで,
Camera.AutoFocusCallback
で、autofocus を切って、takePicture すればOK

そうそう、カメラを使う場合には、manifest に

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

が必要です～。

view plainprint?

1. public class MyPic extends Activity {  
2.   
3.   private static final String TAG = "MyPic";  
4.   private static final int IN_SAMPLE_SIZE = 1;  
5.    
6.   private Camera mCamera;  
7.   private ImageView mImage;  
8.   private boolean mInProgress;  
9.    
10.   private SurfaceHolder.Callback mSurfaceListener =  
11.     new SurfaceHolder.Callback() {  
12.      
13.     @Override  
14.     public void surfaceCreated(SurfaceHolder holder) {  
15.       mCamera = Camera.open();  
16.       Log.i(TAG, "Camera opened");  
17.       try {  
18.         mCamera.setPreviewDisplay(holder);  
19.       }  
20.       catch (Exception e) {  
21.         e.printStackTrace();  
22.       }  
23.     }  
24.      
25.     @Override  
26.     public void surfaceDestroyed(SurfaceHolder holder) {  
27.       mCamera.release();  
28.       mCamera = null;  
29.       Log.i(TAG, "Camera released");  
30.     }  
31.      
32.     @Override  
33.     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {  
34.       Camera.Parameters parameters = mCamera.getParameters();  
35.       parameters.setPreviewSize(width, height);  
36.       mCamera.setParameters(parameters);  
37.       mCamera.startPreview();  
38.       Log.i(TAG, "Camera preview started");  
39.       Log.i(TAG, "width  : " + width);  
40.       Log.i(TAG, "height : " + height);  
41.     }  
42.   };  
43.   
44.   private Camera.AutoFocusCallback mAutoFocusListener =  
45.     new Camera.AutoFocusCallback() {    
46.     @Override  
47.     public void onAutoFocus(boolean success, Camera camera) {  
48.       Log.i(TAG,"AutoFocus : " + success);  
49.       camera.autoFocus(null);  
50.       camera.takePicture(mShutterListener, null, mPictureListener);  
51.       mInProgress = true;  
52.     }  
53.   };  
54.     
55.   private Camera.ShutterCallback mShutterListener =   
56.     new Camera.ShutterCallback() {  
57.     @Override  
58.     public void onShutter() {  
59.       Log.i(TAG, "onShutter");  
60.     }  
61.   };  
62.     
63.   private View.OnClickListener mButtonListener =   
64.     new View.OnClickListener() {     
65.     @Override  
66.     public void onClick(View v) {  
67.       if(mCamera != null && mInProgress == false){  
68.         mCamera.autoFocus(mAutoFocusListener);  
69.       }  
70.     }  
71.   };  
72.     
73.   private Camera.PictureCallback mPictureListener =   
74.     new Camera.PictureCallback() {     
75.     @Override  
76.     public void onPictureTaken(byte[] data, Camera camera) {  
77.       Log.i(TAG, "Picture taken");  
78.       if(data != null) {  
79.         Log.i(TAG, "JPEG Picture Taken");  
80.         BitmapFactory.Options options = new BitmapFactory.Options();  
81.         options.inSampleSize = IN_SAMPLE_SIZE;  
82.         Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);  
83.        
84.         mImage.setImageBitmap(bitmap);  
85.         mImage.setVisibility(View.VISIBLE);  
86.       }  
87.     }  
88.   };  
89.     
90.   @Override  
91.   public void onCreate(Bundle savedInstanceState) {  
92.     super.onCreate(savedInstanceState);  
93.     setContentView(R.layout.camera2);  
94.     
95.     mImage = (ImageView) findViewById(R.id.handpreview);  
96.     SurfaceView surface = (SurfaceView) findViewById(R.id.surfaceview);  
97.     SurfaceHolder holder = surface.getHolder();  
98.     
99.     holder.addCallback(mSurfaceListener);  
100.     holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  
101.     
102.     ImageButton button = (ImageButton) findViewById(R.id.shutter);  
103.     button.setOnClickListener(mButtonListener);  
104.   }   
105. }  

public class MyPic extends Activity {

  private static final String TAG = "MyPic";
  private static final int IN_SAMPLE_SIZE = 1;
 
  private Camera mCamera;
  private ImageView mImage;
  private boolean mInProgress;
 
  private SurfaceHolder.Callback mSurfaceListener =
    new SurfaceHolder.Callback() {
   
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
      mCamera = Camera.open();
      Log.i(TAG, "Camera opened");
      try {
        mCamera.setPreviewDisplay(holder);
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }
   
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
      mCamera.release();
      mCamera = null;
      Log.i(TAG, "Camera released");
    }
   
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
      Camera.Parameters parameters = mCamera.getParameters();
      parameters.setPreviewSize(width, height);
      mCamera.setParameters(parameters);
      mCamera.startPreview();
      Log.i(TAG, "Camera preview started");
      Log.i(TAG, "width  : " + width);
      Log.i(TAG, "height : " + height);
    }
  };

  private Camera.AutoFocusCallback mAutoFocusListener =
    new Camera.AutoFocusCallback() {  
    @Override
    public void onAutoFocus(boolean success, Camera camera) {
      Log.i(TAG,"AutoFocus : " + success);
      camera.autoFocus(null);
      camera.takePicture(mShutterListener, null, mPictureListener);
      mInProgress = true;
    }
  };
  
  private Camera.ShutterCallback mShutterListener = 
    new Camera.ShutterCallback() {
    @Override
    public void onShutter() {
      Log.i(TAG, "onShutter");
    }
  };
  
  private View.OnClickListener mButtonListener = 
    new View.OnClickListener() {   
    @Override
    public void onClick(View v) {
      if(mCamera != null && mInProgress == false){
        mCamera.autoFocus(mAutoFocusListener);
      }
    }
  };
  
  private Camera.PictureCallback mPictureListener = 
    new Camera.PictureCallback() {   
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
      Log.i(TAG, "Picture taken");
      if(data != null) {
        Log.i(TAG, "JPEG Picture Taken");
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = IN_SAMPLE_SIZE;
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);
     
        mImage.setImageBitmap(bitmap);
        mImage.setVisibility(View.VISIBLE);
      }
    }
  };
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.camera2);
  
    mImage = (ImageView) findViewById(R.id.handpreview);
    SurfaceView surface = (SurfaceView) findViewById(R.id.surfaceview);
    SurfaceHolder holder = surface.getHolder();
  
    holder.addCallback(mSurfaceListener);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  
    ImageButton button = (ImageButton) findViewById(R.id.shutter);
    button.setOnClickListener(mButtonListener);
  } 
}