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J'essaie de lire la distance de mise au point (distance du sujet dans une photo) d'un appareil photo Android. Je continue à obtenir 0 pour toutes les distances de mise au point sur mon HTC Desire même quand il se autofocus correctement. Voici l'application entière, ne fonctionne que sur les versions 2.3.3 et supérieures.Distances de mise au point de l'appareil photo
ImageCapture.java
package test.test;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import android.app.Activity;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images.Media;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
//THIS CLASS READS THE FOCUS DISTANCES
class ImageFocusCallback implements AutoFocusCallback {
@Override
public void onAutoFocus(boolean success, Camera camera) {
//READ FOCUS DISTANCES HERE
Camera.Parameters parameters = camera.getParameters();
float[] distances = new float[3];
if (success) {
// Only available with Android 9 (2.3)
// Focus Mode is always reported as auto but
// distances do not appear to be updating
// always: 0.1, 1.2, Infinity, (on my device it's 0,0,0)
Log.d("Focus Mode: ", parameters.getFocusMode());
parameters.getFocusDistances(distances);
Log.d("focus distance near", Float.toString(distances[0]));
Log.d("focus distance optimum", Float.toString(distances[1]));
Log.d("focus distance far", Float.toString(distances[2]));
}
}
}
public class ImageCapture extends Activity implements SurfaceHolder.Callback {
//CALL AUTO FOCUS HERE
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
ImageFocusCallback autoFocusCallBack = new ImageFocusCallback();
//AUTOFOCUS IS CALLED HERE
camera.autoFocus(autoFocusCallBack);
return true;
}
return false;
}
//REST OF THE CODE
private Camera camera;
private boolean isPreviewRunning = false;
private SimpleDateFormat timeStampFormat = new SimpleDateFormat("yyyyMMddHHmmssSS");
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Uri target = Media.EXTERNAL_CONTENT_URI;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Log.e(getClass().getSimpleName(), "onCreate");
getWindow().setFormat(PixelFormat.TRANSLUCENT);
setContentView(R.layout.main);
surfaceView = (SurfaceView) findViewById(R.id.surface);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public boolean onCreateOptionsMenu(android.view.Menu menu) {
MenuItem item = menu.add(0, 0, 0, "goto gallery");
item.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
Intent intent = new Intent(Intent.ACTION_VIEW, target);
startActivity(intent);
return true;
}
});
return true;
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
}
Camera.PictureCallback mPictureCallbackRaw = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera c) {
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK RAW: " + data);
camera.startPreview();
}
};
Camera.PictureCallback mPictureCallbackJpeg = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera c) {
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data);
}
};
Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() {
@Override
public void onShutter() {
Log.e(getClass().getSimpleName(), "SHUTTER CALLBACK");
}
};
// ImageCaptureCallback iccb = null;
// if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
// try {
// String filename = timeStampFormat.format(new Date());
// ContentValues values = new ContentValues();
// values.put(Media.TITLE, filename);
// values.put(Media.DESCRIPTION, "Image capture by camera");
// Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI,
// values);
// // String filename = timeStampFormat.format(new Date());
// iccb = new
// ImageCaptureCallback(getContentResolver().openOutputStream(uri));
// } catch (Exception ex) {
// ex.printStackTrace();
// Log.e(getClass().getSimpleName(), ex.getMessage(), ex);
// }
// }
// if (keyCode == KeyEvent.KEYCODE_BACK) {
// return super.onKeyDown(keyCode, event);
// }
//
// if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
// camera.takePicture(mShutterCallback, mPictureCallbackRaw, iccb);
// return true;
// }
//
// return false;
// }
@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();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.e(getClass().getSimpleName(), "surfaceCreated");
camera = Camera.open();
Camera.Parameters parameters = camera.getParameters();
float[] distances = new float[3];
Log.d("Focus Mode: ", parameters.getFocusMode());
parameters.getFocusDistances(distances);
Log.d("focus distance 0", Float.toString(distances[0]));
Log.d("focus distance 1", Float.toString(distances[1]));
Log.d("focus distance 2", Float.toString(distances[2]));
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.e(getClass().getSimpleName(), "surfaceChanged");
if (isPreviewRunning) {
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(w, h);
camera.setParameters(p);
try {
camera.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();
isPreviewRunning = true;
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.e(getClass().getSimpleName(), "surfaceDestroyed");
camera.stopPreview();
isPreviewRunning = false;
camera.release();
}
}
class ImageCaptureCallback implements PictureCallback {
private OutputStream filoutputStream;
public ImageCaptureCallback(OutputStream filoutputStream) {
this.filoutputStream = filoutputStream;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Log.v(getClass().getSimpleName(), "onPictureTaken=" + data + " length = " + data.length);
filoutputStream.write(data);
filoutputStream.flush();
filoutputStream.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<SurfaceView android:id="@+id/surface"
android:layout_width="fill_parent"
android:layout_height="10dip"
android:layout_weight="1">
</SurfaceView>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="test.test"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".ImageCapture"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Se pourrait-il que qu'il ya un bogue dans le pilote de périphérique? Dans la source Android Camera.java, appelez native_autoFocus() et native_getParameters() pour lire les distances. Est-ce que quelqu'un sait où trouver la source pour les appels natifs?
la partie problématique est getFocusDistances(). AutoFocus() fonctionne correctement. – siamii
Je pourrais essayer le programme sur quelques appareils Froyo, mais vous appelez explicitement 2.3.3/Gingerbread. Quels appels que vous utilisez en ont réellement besoin? –