Hi,
We are trying to capture images using phone's camera, which is HTC Hero in this
case, using the Camera class in Android. However, we haven't been able to let
the phone's camera to autofocus on any object it is pointing at for some
reason. Has anybody experienced a similar problem before? Any suggestions on
how to fix it ?
The code is pasted below in case you'd like to have a look at it. In short,
here's what we have in the AndroidManifest file:
...
<activity android:name=".CameraActivity" android:launchMode="standard"/>
...
</application>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-sdk android:minSdkVersion="3" />
What is the proper way of using the AutoFocusCallback class ? Any ideas ?
Cheers,
Emre
***************************************************************************
package ...;
import ...;
public class CameraActivity extends Activity implements SurfaceHolder.Callback{
private SurfaceHolder mHolder;
private Camera mCamera;
private SurfaceView mSurfaceView;
private boolean isFocused = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Create the preview view and set it as the content of the activity.
setContentView(R.layout.surfaceview);
mSurfaceView = (SurfaceView)findViewById(R.id.surface);
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
}
@Override
protected void onResume() {
Log.e(getClass().getSimpleName(), "onResume");
super.onResume();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
@Override
protected void onStop() {
Log.e(getClass().getSimpleName(), "onStop");
super.onStop();
}
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.
// Since 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.setPreviewFormat(PixelFormat.JPEG);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
private class autoFocusCallback implements AutoFocusCallback {
public void onAutoFocus(boolean focused, Camera camera) {
isFocused = focused;
Log.d("auto focus", "isFocused = " + isFocused);
}
}
Camera.PictureCallback mPictureCallback = new Camera.PictureCallback () {
public void onPictureTaken(byte [] data, Camera camera) {
//mCamera.startPreview();
}
};
Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
}
};
private class ImageCaptureCallback implements PictureCallback {
private OutputStream os;
private String filename;
public ImageCaptureCallback(OutputStream os, String filename){
this.os = os;
this.filename = filename;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Log.v(getClass().getSimpleName(), "onPictureTaken=" + data + "
length = " + data.length);
this.os.write(data);
this.os.flush();
} catch(Exception ex) {
ex.printStackTrace();
} finally {
if (this.os != null)
try{
this.os.close();
} catch (Exception ex) {
ex.printStackTrace();
Log.d(getClass().getSimpleName(), "*** Error while taking photo!!");
}
}
isFocused = false;
Bundle bundle = new Bundle();
if (this.filename != null) {
bundle.putString("uri", this.filename);
Log.d("On Picture Taken", "filename = " + this.filename);
Intent intent = new Intent();
intent.putExtras(bundle);
setResult(RESULT_OK, intent);
finish();
}
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
setResult(RESULT_CANCELED);
return super.onKeyDown(keyCode, event);
}
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode ==
KeyEvent.KEYCODE_CAMERA) {
ImageCaptureCallback imageCaptureCallback = null;
try {
String filename = "sample1.jpg";
ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DISPLAY_NAME, filename);
values.put(MediaStore.Images.ImageColumns.DESCRIPTION, "Image capture by
camera");
Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
imageCaptureCallback = new
ImageCaptureCallback(getContentResolver().openOutputStream(uri),
uri.toString());
} catch(Exception ex ){
ex.printStackTrace();
Log.e(getClass().getSimpleName(), ex.getMessage(), ex);
}
mCamera.takePicture(mShutterCallback, mPictureCallback,
imageCaptureCallback);
return true;
}
return false;
}
}
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