安卓大图旋转

Question

我正在尝试以大约 5MP 的速度旋转使用 Android 设备的相机拍摄的图像。不幸的是它只工作一次。之后我得到一个“内存不足”的异常。即使我释放了以前使用过的图像，它看起来它的数据仍然占用内部图像堆/存储并以某种方式阻止进一步的旋转操作。是否有任何已知的解决此问题的好方法(例如，释放图像内存，旋转图像而不需要两倍的内存大小)？

Answer 1

让相机给你一个已经旋转的图像:

    public void setCameraDisplayOrientation(int cameraId, android.hardware.Camera camera) {
        android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
        android.hardware.Camera.getCameraInfo(cameraId, info);
        int rotation = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getRotation();
        int degrees = 0;
        switch (rotation) {
        case Surface.ROTATION_0:
            degrees = 0;
            break;
        case Surface.ROTATION_90:
            degrees = 90;
            break;
        case Surface.ROTATION_180:
            degrees = 180;
            break;
        case Surface.ROTATION_270:
            degrees = 270;
            break;
        }

        int result;
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            result = (info.orientation + degrees) % 360;
            result = (360 - result) % 360; // compensate the mirror
        } else { // back-facing
            result = (info.orientation - degrees + 360) % 360;
        }
        // set the right preview orientation
        camera.setDisplayOrientation(result);
        // make the camera output a rotated image
        Camera.Parameters cameraParameters = camera.getParameters();
        cameraParameters.setRotation(result);
        camera.setParameters(cameraParameters);
    }