用于旋转相机意图捕获的图像的代码在 Android 中不起作用

我有一个问题，使用相机意图捕获的图像被旋转，我在为什么使用相机意图捕获的图像在某些 Android 设备上会旋转？ https://stackoverflow.com/questions/14066038/why-image-captured-using-camera-intent-gets-rotated-on-some-devices-in-android

因此，根据那里的建议答案，我现在尝试旋转使用相机获得的图像（我已使用相机意图）。我的代码是，

public class SimpleCameraActivity extends Activity {
private static final int TAKE_PICTURE = 1888;
private Uri imageUri;
ImageView imageView;
Bitmap bitmap;
Button btnOK, btnDiscard;
RelativeLayout rLButtons;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.simple_camera);
    imageView = (ImageView) findViewById(R.id.image_view_sc);
    captureImage();
}

public void captureImage() {
    Intent intentCamera = new Intent("android.media.action.IMAGE_CAPTURE");
    File filePhoto = new File(Environment.getExternalStorageDirectory(), "Pic.jpg");
    imageUri = Uri.fromFile(filePhoto);
    MyApplicationGlobal.imageUri = imageUri.getPath();
    intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(intentCamera, TAKE_PICTURE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intentFromCamera) {
    super.onActivityResult(requestCode, resultCode, intentFromCamera);
    if (resultCode == RESULT_OK && requestCode == TAKE_PICTURE) {
        if (intentFromCamera != null) {
            Bundle extras = intentFromCamera.getExtras();
            if (extras.containsKey("data")) {
                bitmap = (Bitmap) extras.get("data");
            } else {
                bitmap = getBitmapFromUri();
            }
        } else {
            bitmap = getBitmapFromUri();
        }
        checkForRotation();
        //rotateImage();
        //rotateImage1();
        rotateImage3();
        //imageView.setImageBitmap(bitmap);
        // imageView.setImageURI(imageUri);
    } else {
        finish();
    }
}

public void rotateImage() {
    Bitmap targetBitmap = Bitmap.createBitmap(100, 80, bitmap.getConfig());
    Canvas canvas = new Canvas(targetBitmap);
    Matrix matrix = new Matrix();
    matrix.setRotate(180, bitmap.getWidth() / 2, bitmap.getHeight() / 2);
    matrix.setRotate(90);
    canvas.drawBitmap(bitmap, matrix, new Paint());
    imageView.setImageBitmap(bitmap);
}

public void rotateImage1() {
    Matrix matrix = new Matrix();
    matrix.setRotate(90, bitmap.getWidth() / 2, bitmap.getHeight() / 2);
    RectF rectF = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());
    matrix.mapRect(rectF);
    Bitmap targetBitmap = Bitmap.createBitmap((int) rectF.width(), (int) rectF.height(), bitmap.getConfig());
    Canvas canvas = new Canvas(targetBitmap);
    canvas.drawBitmap(bitmap, matrix, new Paint());
    imageView.setImageBitmap(bitmap);
}

public void rotateImage2() {
    Matrix mtx = new Matrix();
    mtx.reset();
    mtx.preTranslate(20, 30);
    mtx.setRotate((float) 90, 25, 35);
    mtx.postTranslate(30, 40);
    Bitmap rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0, 100, 100, mtx, true);
    this.bitmap = rotatedBMP;
    imageView.setImageBitmap(bitmap);
}

public void rotateImage3() {
    Bitmap bmpOriginal = bitmap;
    Bitmap targetBitmap = Bitmap.createBitmap((bmpOriginal.getWidth()), (bmpOriginal.getHeight()), Bitmap.Config.ARGB_8888);
    Paint p = new Paint();
    p.setAntiAlias(true);

    Matrix matrix = new Matrix();
    matrix.setRotate((float) 90, (float) (bmpOriginal.getWidth() / 2), (float) (bmpOriginal.getHeight() / 2));

    RectF rectF = new RectF(0, 0, bmpOriginal.getWidth(), bmpOriginal.getHeight());
    matrix.mapRect(rectF);

    targetBitmap = Bitmap.createBitmap((int) rectF.width(), (int) rectF.height(), Bitmap.Config.ALPHA_8);

    Canvas tempCanvas = new Canvas(targetBitmap);
    tempCanvas.drawBitmap(bmpOriginal, matrix, p);
    imageView.setImageBitmap(bmpOriginal);
}

public Bitmap getBitmapFromUri() {
    getContentResolver().notifyChange(imageUri, null);
    ContentResolver cr = getContentResolver();
    Bitmap bitmap;
    try {
        bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}
}

我尝试过不同的代码rotateImage、1、2、3等。但没有代码工作。 rotateImage2() 正在工作，但它严重影响质量，所以不能使用它。

我从这里得到这些代码Android：如何以中心点旋转位图 https://stackoverflow.com/questions/4166917/android-how-to-rotate-a-bitmap-on-a-center-point那里的用户说它有效，但对我来说不行。 那么我做错了什么。

坚持旋转图像2()并使用较少的转换。这段代码对我有用：

private Bitmap rotateImage(String pathToImage) {

    // 1. figure out the amount of degrees
    int rotation = getImageRotation();

    // 2. rotate matrix by postconcatination
    Matrix matrix = new Matrix();
    matrix.postRotate(rotation);

    // 3. create Bitmap from rotated matrix
    Bitmap sourceBitmap = BitmapFactory.decodeFile(pathToImage);
    return Bitmap.createBitmap(sourceBitmap, 0, 0, sourceBitmap.getWidth(), sourceBitmap.getHeight(), matrix, true);        
}

获取图像旋转查看你的其他帖子 https://stackoverflow.com/questions/14066038/why-image-captured-using-camera-intent-gets-rotated-on-some-devices-in-android。有关 Matrix 操作及其差异的更多信息，例如 setRotate 和 postRotate看看这个帖子 https://stackoverflow.com/questions/3855578/android-matrix-what-is-the-different-between-preconcat-and-postconcat.