我正在开发的自定义相机应用程序始终将图像旋转 90 度，我的相机的屏幕视图被扭曲并逆时针旋转 90 度，但是当它保存图像时，就好像我已经用我的手机在我拿着它时向左90度纵向，它可以拍摄横向照片。这是相机活动的代码，我该怎么做才能旋转相机的屏幕视图？
package fr.altimer.lost.collect.client;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.location.Location;
import android.os.Bundle;
import android.os.Environment;
import android.os.IBinder;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.Toast;
import fr.altimer.lost.collect.client.model.Data;
import fr.altimer.lost.collect.client.model.Image;
import fr.altimer.lost.collect.client.preferences.Configuration;
import fr.altimer.lost.collect.client.services.SearchService;
import fr.altimer.lost.collect.client.services.ServiceSensor;
public class CameraActivity extends Activity implements SurfaceHolder.Callback, Camera.PictureCallback {
private Camera camera;
private SurfaceView surfaceCamera;
private Boolean isPreview;
private ServiceSensor mService;
private boolean mBound;
private int routeGiven = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// On met l'application en plein écran et sans barre de titre
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
isPreview = false;
// On applique notre layout
setContentView(R.layout.camera);
// On récupère notre surface pour le preview
surfaceCamera = (SurfaceView) findViewById(R.id.surfaceViewCamera);
// Bouton pour prendre la photo
ImageButton picture = (ImageButton) findViewById(R.id.photo);
picture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
takepicture();
}
});
// Bouton retour
ImageButton back = (ImageButton) findViewById(R.id.TableLayout02);
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
// Méthode d'initialisation de la caméra
InitializeCamera();
if (savedInstanceState != null) {
routeGiven = savedInstanceState.getInt("routeGiven", 0);
}
}
public void InitializeCamera() {
// On attache nos retour du holder à notre activite
surfaceCamera.getHolder().addCallback(this);
surfaceCamera.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// Si le mode preview est lancé alors on le stop
if (isPreview) {
camera.stopPreview();
}
// On récupère les parametres de la camera
Camera.Parameters parameters = camera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size previewSize = getOptimalPreviewSize(sizes, width, height);
// On change la taille
parameters.setPreviewSize(previewSize.width, previewSize.height);
// On applique nos nouveaux parametres
camera.setParameters(parameters);
try {
// On attache notre previsualisation de la camera au holder de la
// surface
camera.setPreviewDisplay(surfaceCamera.getHolder());
} catch (IOException e) {
}
// On lance la previeuw
camera.startPreview();
isPreview = true;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// On prend le controle de la camera
if (camera == null)
camera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// On arrête la camera et on rend la main
if (camera != null) {
camera.stopPreview();
isPreview = false;
camera.release();
}
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
int routeid = 0;
// récupération de l'id du parcours
if (mBound && mService != null) {
routeid = mService.getIdCurrent();
} else {
routeid = routeGiven;
}
// Création et sauvegarde la photo
String pictureName = getFileName(routeid);
if (pictureName != null) {
File pictureFile = new File(pictureName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.flush();
Toast.makeText(getBaseContext(), "New Image saved", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// Enregistrement du path de l'image dans la bdd
if (mBound && mService != null) {
Location loc = mService.getLastLocation();
Data image;
if (loc == null)
image = new Image(pictureName, null, null);
else
image = new Image(pictureName, loc.getLatitude(), loc.getLongitude());
mService.saveData(image);
} else {
Intent intent = new Intent();
intent.putExtra("path", pictureName);
setResult(RESULT_OK, intent);
}
} else {
Toast.makeText(this, "Can't create directory to save image.", Toast.LENGTH_LONG).show();
}
finish();
}
/**
* Récupération du chemin de la carte SD
* @return
*/
private File getDir() {
String status = Environment.getExternalStorageState();
try {
if (status.equals(Environment.MEDIA_MOUNTED)) {
return Environment.getExternalStorageDirectory();
}
} catch (IllegalArgumentException e) {
status = Environment.MEDIA_REMOVED;
}
return null;
}
/**
* Création et récupération du nom du fichier jpg
* @param routeid
* @return
*/
private String getFileName(int routeid) {
SimpleDateFormat dateFormat1 = new SimpleDateFormat("ddMMyy-HHmmss");
String dateString = dateFormat1.format(new Date());
File fileDir = getDir();
if (fileDir != null) {
File filePath = new File(fileDir.getAbsolutePath() + Configuration.LOST_FOLDER);
if (!filePath.exists())
filePath.mkdir();
return filePath.getPath() + File.separator + "Picture_" + dateString + "_id_" + routeid + ".jpg";
} else {
return null;
}
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) w / h;
if (sizes == null)
return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (KeyEvent.KEYCODE_CAMERA == keyCode /* && event.isLongPress() */) {
takepicture();
return true;
}
if (KeyEvent.KEYCODE_BACK == keyCode) {
finish();
return true;
}
return false;
}
private void takepicture() {
camera.takePicture(null, null, this);
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
mService = ((ServiceSensor.LocalBinder) service).getService();
mService.setHandler(null);
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
@Override
protected void onStart() {
super.onStart();
Intent intent = new Intent(this, ServiceSensor.class);
if (SearchService.Search(this, "ServiceSensor")) {
bindService(intent, mConnection, Context.BIND_NOT_FOREGROUND);
}
}
@Override
protected void onStop() {
super.onStop();
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
}
（评论偶尔是法语，因为我和一位法国同事一起工作，虽然我不会说太多法语。）