Android
Caméra et Galerie

Prendre une photo pleine grandeur à partir de l'appareil photo

Pour prendre une photo, nous devons d'abord déclarer les autorisations requises dans AndroidManifest.xml . Nous avons besoin de deux autorisations:

• Camera - pour ouvrir l'application de la caméra. Si l'attribut required est défini sur true vous ne pourrez pas installer cette application si vous n'avez pas de caméra matérielle.
• WRITE_EXTERNAL_STORAGE - Cette autorisation est nécessaire pour créer un nouveau fichier, dans lequel la photo capturée sera enregistrée.

AndroidManifest.xml

<uses-feature android:name="android.hardware.camera"
          android:required="true" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

L'idée principale en prenant des photos en taille réelle de l'appareil photo est que nous devons créer un nouveau fichier pour la photo, avant d'ouvrir l'application appareil photo et de capturer des photos.

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            Log.e("DEBUG_TAG", "createFile", ex);
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getAlbumDir();
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}

private File getAlbumDir() {
    File storageDir = null;

    if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {

        storageDir = new File(Environment.getExternalStorageDirectory()
                + "/dcim/"
                + "MyRecipes");

        if (!storageDir.mkdirs()) {
            if (!storageDir.exists()) {
                Log.d("CameraSample", "failed to create directory");
                return null;
            }
        }

    } else {
        Log.v(getString(R.string.app_name), "External storage is not mounted READ/WRITE.");
    }

    return storageDir;
}

private void setPic() {

    /* There isn't enough memory to open up more than a couple camera photos */
    /* So pre-scale the target bitmap into which the file is decoded */

    /* Get the size of the ImageView */
    int targetW = recipeImage.getWidth();
    int targetH = recipeImage.getHeight();

    /* Get the size of the image */
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

    /* Figure out which way needs to be reduced less */
    int scaleFactor = 2;
    if ((targetW > 0) && (targetH > 0)) {
        scaleFactor = Math.max(photoW / targetW, photoH / targetH);
    }

    /* Set bitmap options to scale the image decode target */
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;
    bmOptions.inPurgeable = true;

    Matrix matrix = new Matrix();
    matrix.postRotate(getRotation());

    /* Decode the JPEG file into a Bitmap */
    Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
    bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, false);

    /* Associate the Bitmap to the ImageView */
    recipeImage.setImageBitmap(bitmap);
}

private float getRotation() {
    try {
        ExifInterface ei = new ExifInterface(mCurrentPhotoPath);
        int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);

        switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                return 90f;
            case ExifInterface.ORIENTATION_ROTATE_180:
                return 180f;
            case ExifInterface.ORIENTATION_ROTATE_270:
                return 270f;
            default:
                return 0f;
        }
    } catch (Exception e) {
        Log.e("Add Recipe", "getRotation", e);
        return 0f;
    }
}

private void galleryAddPic() {
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(mCurrentPhotoPath);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    sendBroadcast(mediaScanIntent);
}

private void handleBigCameraPhoto() {

    if (mCurrentPhotoPath != null) {
        setPic();
        galleryAddPic();
    }
}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == Activity.RESULT_OK) {
        handleBigCameraPhoto();
    }
}

Prendre une photo

Ajoutez une autorisation pour accéder à la caméra au fichier AndroidManifest:

<uses-permission android:name="android.permission.CAMERA"></uses-permission>  
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Fichier Xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<SurfaceView android:id="@+id/surfaceView" android:layout_height="0dip" android:layout_width="0dip"></SurfaceView>
<ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imageView"></ImageView>
</LinearLayout>

Activité

import java.io.IOException;  
  
import android.app.Activity;  
import android.graphics.Bitmap;  
import android.graphics.BitmapFactory;  
import android.hardware.Camera;  
import android.hardware.Camera.Parameters;  
import android.os.Bundle;  
import android.view.SurfaceHolder;  
import android.view.SurfaceView;  
import android.widget.ImageView;  
  
public class TakePicture extends Activity implements SurfaceHolder.Callback  
{  
    //a variable to store a reference to the Image View at the main.xml file  
    private ImageView iv_image;  
    //a variable to store a reference to the Surface View at the main.xml file  
    private SurfaceView sv;  
  
    //a bitmap to display the captured image  
    private Bitmap bmp;  
  
    //Camera variables  
    //a surface holder  
    private SurfaceHolder sHolder;  
    //a variable to control the camera  
    private Camera mCamera;  
    //the camera parameters  
    private Parameters parameters;  
  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState)  
    {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
  
        //get the Image View at the main.xml file  
        iv_image = (ImageView) findViewById(R.id.imageView);  
  
        //get the Surface View at the main.xml file  
        sv = (SurfaceView) findViewById(R.id.surfaceView);  
  
        //Get a surface  
        sHolder = sv.getHolder();  
  
        //add the callback interface methods defined below as the Surface View callbacks  
        sHolder.addCallback(this);  
  
        //tells Android that this surface will have its data constantly replaced  
        sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);  
    }  
  
    @Override  
    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)  
    {  
         //get camera parameters  
         parameters = mCamera.getParameters();  
  
         //set camera parameters  
         mCamera.setParameters(parameters);  
         mCamera.startPreview();  
  
         //sets what code should be executed after the picture is taken  
         Camera.PictureCallback mCall = new Camera.PictureCallback()  
         {  
             @Override  
             public void onPictureTaken(byte[] data, Camera camera)  
             {  
                 //decode the data obtained by the camera into a Bitmap  
                 bmp = BitmapFactory.decodeByteArray(data, 0, data.length);  
                String filename=Environment.getExternalStorageDirectory()
                                + File.separator + "testimage.jpg";
                FileOutputStream out = null;
                try {
                    out = new FileOutputStream(filename);
                    bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
                    // PNG is a lossless format, the compression factor (100) is ignored
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    try {
                        if (out != null) {
                            out.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                 //set the iv_image  
                 iv_image.setImageBitmap(bmp);  
             }  
         };  
  
         mCamera.takePicture(null, null, mCall);  
    }  
  
    @Override  
    public void surfaceCreated(SurfaceHolder holder)  
    {  
        // The Surface has been created, acquire the camera and tell it where  
        // to draw the preview.  
        mCamera = Camera.open();  
        try {  
           mCamera.setPreviewDisplay(holder);  
  
        } catch (IOException exception) {  
            mCamera.release();  
            mCamera = null;  
        }  
    }  
  
    @Override  
    public void surfaceDestroyed(SurfaceHolder holder)  
    {  
        //stop the preview  
        mCamera.stopPreview();  
        //release the camera  
        mCamera.release();  
        //unbind the camera from this object  
        mCamera = null;  
    }  
}  

Comment démarrer la caméra ou la galerie et enregistrer le résultat de la caméra dans le stockage

Tout d'abord, vous avez besoin des dossiers Uri et temporaire et des codes de demande:

public final int REQUEST_SELECT_PICTURE = 0x01;
public final int REQUEST_CODE_TAKE_PICTURE = 0x2;
public static String TEMP_PHOTO_FILE_NAME ="photo_";
Uri mImageCaptureUri;
File mFileTemp;

Puis lancez mFileTemp:

public void initTempFile(){
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {

        mFileTemp = new File(Environment.getExternalStorageDirectory() + File.separator
                + getResources().getString(R.string.app_foldername) + File.separator
                + getResources().getString(R.string.pictures_folder)
                , TEMP_PHOTO_FILE_NAME
                + System.currentTimeMillis() + ".jpg");
        mFileTemp.getParentFile().mkdirs();
    } else {
        mFileTemp = new File(getFilesDir() + File.separator
                + getResources().getString(R.string.app_foldername)
                + File.separator + getResources().getString(R.string.pictures_folder)
                , TEMP_PHOTO_FILE_NAME + System.currentTimeMillis() + ".jpg");
        mFileTemp.getParentFile().mkdirs();
    }
}

Ouverture de la Camera et de la Gallery :

public void openCamera(){
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    try {
        mImageCaptureUri = null;
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            mImageCaptureUri = Uri.fromFile(mFileTemp);

        } else {

            mImageCaptureUri = InternalStorageContentProvider.CONTENT_URI;

        }
        intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);
    } catch (Exception e) {

        Log.d("error", "cannot take picture", e);
    }
}

public void openGallery(){
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        requestPermission(Manifest.permission.READ_EXTERNAL_STORAGE,
                getString(R.string.permission_read_storage_rationale),
                REQUEST_STORAGE_READ_ACCESS_PERMISSION);
    } else {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(Intent.createChooser(intent, getString(R.string.select_image)), REQUEST_SELECT_PICTURE);
    }

}

Puis dans la méthode onActivityResult :

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (resultCode != RESULT_OK) {
        return;
    }
    Bitmap bitmap;

    switch (requestCode) {

        case REQUEST_SELECT_PICTURE:
            try {
                Uri uri = data.getData();
                try {
                    bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
                    Bitmap bitmapScaled = Bitmap.createScaledBitmap(bitmap, 800, 800, true);
                    Drawable drawable=new BitmapDrawable(bitmapScaled);
                    mImage.setImageDrawable(drawable);
                    mImage.setVisibility(View.VISIBLE);
                } catch (IOException e) {
                    Log.v("act result", "there is an error : "+e.getContent());
                }
            } catch (Exception e) {
                Log.v("act result", "there is an error : "+e.getContent());
            }
            break;
        case REQUEST_CODE_TAKE_PICTURE:
            try{
               Bitmap bitmappicture = MediaStore.Images.Media.getBitmap(getContentResolver() , mImageCaptureUri);
               mImage.setImageBitmap(bitmappicture);
               mImage.setVisibility(View.VISIBLE);
           }catch (IOException e){
              Log.v("error camera",e.getMessage());
           }
           break; 
    }
    super.onActivityResult(requestCode, resultCode, data);
}

Vous avez besoin de ces autorisations dans AndroidManifest.xml :

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />

Et vous devez gérer les autorisations d'exécution telles que le stockage externe en lecture / écriture, etc.

Je vérifie l'autorisation READ_EXTERNAL_STORAGE dans ma méthode openGallery :

Ma méthode requestPermission :

protected void requestPermission(final String permission, String rationale, final int requestCode) {
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
        showAlertDialog(getString(R.string.permission_title_rationale), rationale,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(BasePermissionActivity.this,
                                new String[]{permission}, requestCode);
                    }
                }, getString(android.R.string.ok), null, getString(android.R.string.cancel));
    } else {
        ActivityCompat.requestPermissions(this, new String[]{permission}, requestCode);
    }
}

Ensuite, remplacez la méthode onRequestPermissionsResult :

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        case REQUEST_STORAGE_READ_ACCESS_PERMISSION:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                handleGallery();
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

méthode showAlertDialog :

protected void showAlertDialog(@Nullable String title, @Nullable String message,
                               @Nullable DialogInterface.OnClickListener onPositiveButtonClickListener,
                               @NonNull String positiveText,
                               @Nullable DialogInterface.OnClickListener onNegativeButtonClickListener,
                               @NonNull String negativeText) {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.setPositiveButton(positiveText, onPositiveButtonClickListener);
    builder.setNegativeButton(negativeText, onNegativeButtonClickListener);
    mAlertDialog = builder.show();
}

Définir la résolution de la caméra

Définissez Haute résolution par programmation.

Camera mCamera = Camera.open();
Camera.Parameters params = mCamera.getParameters();

// Check what resolutions are supported by your camera
List<Size> sizes = params.getSupportedPictureSizes();

// Iterate through all available resolutions and choose one.
// The chosen resolution will be stored in mSize.
Size mSize;
for (Size size : sizes) {
    Log.i(TAG, "Available resolution: "+size.width+" "+size.height);
        mSize = size;
    }
}

Log.i(TAG, "Chosen resolution: "+mSize.width+" "+mSize.height);
params.setPictureSize(mSize.width, mSize.height);
mCamera.setParameters(params); 

Décoder le bitmap correctement pivoté à partir de l'URI récupéré avec l'intention

private static final String TAG = "IntentBitmapFetch";
private static final String COLON_SEPARATOR = ":";
private static final String IMAGE = "image";

@Nullable
public Bitmap getBitmap(@NonNull Uri bitmapUri, int maxDimen) {
    InputStream is = context.getContentResolver().openInputStream(bitmapUri);
    Bitmap bitmap = BitmapFactory.decodeStream(is, null, getBitmapOptions(bitmapUri, maxDimen));
    
    int imgRotation = getImageRotationDegrees(bitmapUri);

    int endRotation = (imgRotation < 0) ? -imgRotation : imgRotation;
    endRotation %= 360;
    endRotation = 90 * (endRotation / 90);
    if (endRotation > 0 && bitmap != null) {
        Matrix m = new Matrix();
        m.setRotate(endRotation);
        Bitmap tmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m, true);
        if (tmp != null) {
            bitmap.recycle();
            bitmap = tmp;
        }
    }

    return bitmap;
}

private BitmapFactory.Options getBitmapOptions(Uri uri, int imageMaxDimen){
    BitmapFactory.Options options = new BitmapFactory.Options();
    if (imageMaxDimen > 0) {
        options.inJustDecodeBounds = true;
        decodeImage(null, uri, options);
        options.inSampleSize = calculateScaleFactor(options, imageMaxDimen);
        options.inJustDecodeBounds = false;
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        addInBitmapOptions(options);
    }
}

private int calculateScaleFactor(@NonNull BitmapFactory.Options bitmapOptionsMeasureOnly, int imageMaxDimen) {
    int inSampleSize = 1;
    if (bitmapOptionsMeasureOnly.outHeight > imageMaxDimen || bitmapOptionsMeasureOnly.outWidth > imageMaxDimen) {
        final int halfHeight = bitmapOptionsMeasureOnly.outHeight / 2;
        final int halfWidth = bitmapOptionsMeasureOnly.outWidth / 2;
        while ((halfHeight / inSampleSize) > imageMaxDimen && (halfWidth / inSampleSize) > imageMaxDimen) {
            inSampleSize *= 2;
        }
    }
    return inSampleSize;
}

    public int getImageRotationDegrees(@NonNull Uri imgUri) {
    int photoRotation = ExifInterface.ORIENTATION_UNDEFINED;

    try {
        boolean hasRotation = false;
        //If image comes from the gallery and is not in the folder DCIM (Scheme: content://)
        String[] projection = {MediaStore.Images.ImageColumns.ORIENTATION};
        Cursor cursor = context.getContentResolver().query(imgUri, projection, null, null, null);
        if (cursor != null) {
            if (cursor.getColumnCount() > 0 && cursor.moveToFirst()) {
                photoRotation = cursor.getInt(cursor.getColumnIndex(projection[0]));
                hasRotation = photoRotation != 0;
                Log.d("Cursor orientation: "+ photoRotation);
            }
            cursor.close();
        }

        //If image comes from the camera (Scheme: file://) or is from the folder DCIM (Scheme: content://)
        if (!hasRotation) {
            ExifInterface exif = new ExifInterface(getAbsolutePath(imgUri));
            int exifRotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                    ExifInterface.ORIENTATION_NORMAL);
            switch (exifRotation) {
                case ExifInterface.ORIENTATION_ROTATE_90: {
                    photoRotation = 90;
                    break;
                }
                case ExifInterface.ORIENTATION_ROTATE_180: {
                    photoRotation = 180;
                    break;
                }
                case ExifInterface.ORIENTATION_ROTATE_270: {
                    photoRotation = 270;
                    break;
                }
            }
            Log.d(TAG, "Exif orientation: "+ photoRotation);
        }
    } catch (IOException e) {
        Log.e(TAG, "Error determining rotation for image"+ imgUri, e);
    }
    return photoRotation;
}

@TargetApi(Build.VERSION_CODES.KITKAT)
private String getAbsolutePath(Uri uri) {
    //Code snippet edited from: http://stackoverflow.com/a/20559418/2235133
    String filePath = uri.getPath();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, uri)) {
        // Will return "image:x*"
        String[] wholeID = TextUtils.split(DocumentsContract.getDocumentId(uri), COLON_SEPARATOR);
        // Split at colon, use second item in the array
        String type = wholeID[0];
        if (IMAGE.equalsIgnoreCase(type)) {//If it not type image, it means it comes from a remote location, like Google Photos
            String id = wholeID[1];
            String[] column = {MediaStore.Images.Media.DATA};
            // where id is equal to
            String sel = MediaStore.Images.Media._ID + "=?";
            Cursor cursor = context.getContentResolver().
                    query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                            column, sel, new String[]{id}, null);
            if (cursor != null) {
                int columnIndex = cursor.getColumnIndex(column[0]);
                if (cursor.moveToFirst()) {
                    filePath = cursor.getString(columnIndex);
                }
                cursor.close();
            }
            Log.d(TAG, "Fetched absolute path for uri" + uri);
        }
    }
    return filePath;
}