代码旋转相机意图捕获的图像不工作在Android

Question

我有一个问题，我的图像捕获使用相机意图旋转，我问为什么使用相机意图捕获的图像在Android上的一些设备上旋转?

所以根据建议的答案那里，我现在试图旋转图像，我得到使用相机(我已经使用相机意图)。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。但是没有代码在工作。rotateImage2()是工作的，但它严重影响质量，所以不能使用

我从Android上得到了这些代码:如何在中心点上旋转位图，用户说它有效，但我不这么认为。我做错了什么

Answer 1

继续使用rotateImage2()，并使用更少的转换。下面的代码为我工作:

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);        
}

要获得图像旋转，请查看您的其他帖子。有关矩阵操作及其区别的更多信息，例如setRotate和postRotate，请查看这篇文章。