メイン アクティビティ内のフレーム レイアウトでカメラをプレビューできる Android カメラ アプリケーションをセットアップしました。私がやりたいこと (カメラ固有の機能を使用せずに、これをハードウェアから完全に独立させたい) は、ピクセルの周りにボックスを表示するか、すべてをぼかして、プレビューの中央にある 150 X 150 ピクセルのアウトラインです。 150 x 150 以外のピクセル。さらに、写真を撮らずに、これらのピクセルを読み取りたいと思います。最終的に私が目指している効果は、カメラを動かすと、150 x 150 の領域内の赤、緑、青の色濃度の変化を表示することです。ネストされた for ループを実行してピクセルから色を取得する方法は知っていますが、高さと重量のオフセットを取得してピクセルの読み取りを開始する方法を知る必要があります。ご協力いただきありがとうございます。マイク
public class MyActivity extends Activity {
final public String TAG = "MyActivity";
static private Camera mCamera = null;
static public Camera getCamera() { return mCamera; }
private static boolean mBPreviewingCamera = false;
private PreviewSurface mPS;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String lMTH = "onCreate ";
Log.i(TAG, lMTH + "Start");
setContentView(R.layout.activity_color_temperature_estimator);
if (isThereACamera()) {
mPreviewCamera(true);
TextView lTVTemp = (TextView) findViewById(R.id.TV_TEMP);
lTVTemp.setText("Camera exists able to proceed");
lTVTemp = null;
} else {
Toast.makeText(this, "No camera! Uunable to proceed", Toast.LENGTH_LONG).show();
TextView lTVTemp = (TextView) findViewById(R.id.TV_TEMP);
lTVTemp.setText("No camera! Uunable to proceed");
lTVTemp = null;
}
}
public void mPreviewCamera(boolean pBPreviewingCamera) {
String lMTH = "mPreviewCamera ";
try {
if (pBPreviewingCamera) {
Log.i(TAG, lMTH + "Open Camera");
mCamera = Camera.open();
mPS = new PreviewSurface(this);
FrameLayout lFVPreview = (FrameLayout) findViewById(R.id.FL_Preview);
lFVPreview.addView(mPS);
lFVPreview = null;
mBPreviewingCamera = true;
Button lBTNTemp = (Button) findViewById(R.id.BTN_CLOSE);
lBTNTemp.setText(R.string.BTN_CLOSE);
lBTNTemp = null;
} else {
Log.i(TAG, lMTH + "Open Camera");
mCloseCamera();
Button lBTNTemp = (Button) findViewById(R.id.BTN_CLOSE);
lBTNTemp.setText(R.string.BTN_OPEN);
lBTNTemp = null;
}
} catch (Exception e) {
Log.i(TAG, lMTH + e.getMessage());
mCloseCamera();
e.printStackTrace();
}
}
public void mCloseCamera() {
String lMTH = "mCloseCamera ";
Log.i(TAG, lMTH + "Turn Camera Off");
if (mCamera != null) {
mCamera.stopPreview();
mCamera.release();
}
mCamera = null;
mBPreviewingCamera = false;
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
String lMTH = "onPause ";
Log.i(TAG, lMTH + "Turn Camera Off");
mPreviewCamera(false);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
String lMTH = "onDestroy ";
Log.i(TAG, lMTH + "Turn Camera Off");
mPreviewCamera(false);
}
/** Check if this phone has a camera */
private boolean isThereACamera() {
if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
// There is a camera
return true;
} else {
// There isn't a camera
return false;
}
}
public void mBTN(View view) {
mPreviewCamera(!mBPreviewingCamera);
}
}
public class PreviewSurface extends SurfaceView implements SurfaceHolder.Callback {
final static public String TAG = "PreviewSurface";
private SurfaceHolder mSH;
/**
* @param context
*/
public PreviewSurface(Context pContext) {
super(pContext);
// TODO Auto-generated constructor stub
String lMTH = "PreviewSurface(Context pContext) ";
Log.i(TAG, lMTH + "Constructor");
pContext = null;
mSH = getHolder();
mSH.addCallback(this);
mSH.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceChanged(android.view.SurfaceHolder, int, int, int)
*/
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
String lMTH = "surfaceChanged ";
// TODO Auto-generated method stub
Log.i(TAG, lMTH + "arg1 = " + arg1 + " arg2 " + arg2 + " arg3 " + arg3);
if (arg0.getSurface() != null) {
// stop old preview if it exists
try {
Log.i(TAG, lMTH + "Stop Preview ");
MyActivity.getCamera().stopPreview();
} catch (Exception e) {
Log.i(TAG, lMTH + "Stoping preview exception " + e.getMessage());
}
// start new preview
try {
Log.i(TAG, lMTH + "Set Preview ");
MyActivity.getCamera().setPreviewDisplay(arg0);
Log.i(TAG, lMTH + "Start Preview ");
MyActivity.getCamera().startPreview();
} catch (Exception e){
Log.i(TAG, lMTH + "Starting camera preview exception " + e.getMessage());
}
}
// stop preview before making changes
}
/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceCreated(android.view.SurfaceHolder)
*/
public void surfaceCreated(SurfaceHolder arg0) {
String lMTH = "surfaceCreated ";
// TODO Auto-generated method stub
try {
Log.i(TAG, lMTH + "Set Preview ");
MyActivity.getCamera().setPreviewDisplay(arg0);
Log.i(TAG, lMTH + "Start Preview ");
MyActivity.getCamera().startPreview();
} catch (Exception e) {
Log.i(TAG, lMTH + "Exception " + e.getMessage());
e.printStackTrace();
}
}
/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceDestroyed(android.view.SurfaceHolder)
*/
public void surfaceDestroyed(SurfaceHolder arg0) {
String lMTH = "surfaceDestroyed ";
// TODO Auto-generated method stub
Log.i(TAG, lMTH + "Activity will handle destroy");
}