Question

我正在使用相机来显示预览。应用程序始终处于纵向模式（禁用横向模式）。相机预览始终旋转90度ccw并且我无法更改它（既不使用setDisplayOrientation也不使用p.set（“orientation”，“portrait”）和p.set（“rotation”，90））。

预览总是像这样旋转还是取决于设备？如果在纵向模式下总是如此，我可以随后旋转图像。

我将手机置于“纵向模式”，但是相机预览处于模式环境中（即我看到旋转了90度的东西）。

可在许多设备上正常使用 LG Optimus 三星Galaxy S2

一些三星设备的问题（SAMSUNG GALAXY ACE DUOS）

                             /*
            Copyright Sergi Martínez (@sergiandreplace)

            Licensed under the Apache License, Version 2.0 (the "License");
            you may not use this file except in compliance with the License.
            You may obtain a copy of the License at

                http://www.apache.org/licenses/LICENSE-2.0

            Unless required by applicable law or agreed to in writing, software
            distributed under the License is distributed on an "AS IS" BASIS,
            WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
            See the License for the specific language governing permissions and
            limitations under the License.

            */

            package com.appunta.android.ui;

            import java.io.IOException;
            import java.lang.reflect.Method;

            import android.content.Context;
            import android.hardware.Camera;
            import android.util.AttributeSet;
            import android.util.Log;
            import android.view.Display;
            import android.view.Surface;
            import android.view.SurfaceHolder;
            import android.view.View;
            import android.view.SurfaceHolder.Callback;
            import android.view.SurfaceView;
            import android.view.WindowManager;

            public class CameraView extends SurfaceView implements Callback {

                Camera camera;
                SurfaceHolder previewHolder;
                private boolean isPreviewRunning;

                public CameraView(Context ctx) {
                    super(ctx);

                    init();
                }

                private void init() {
                    previewHolder = this.getHolder();
                    previewHolder.addCallback(this);
                    previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
                }

                public CameraView(Context context, AttributeSet attrs) {
                    super(context, attrs);
                    init();
                }

                public CameraView(Context context, AttributeSet attrs, int defStyle) {
                    super(context, attrs, defStyle);
                    init();
                }

                public void surfaceCreated(SurfaceHolder holder) {
                    camera = Camera.open();
                    setCameraDisplayOrientation(camera);
                    try {
                        camera.setPreviewDisplay(holder);
                    } catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                    camera.startPreview();
                }

                public void surfaceChanged(SurfaceHolder holder, int format, int width,
                        int height) {
                    if (isPreviewRunning) {
                        camera.stopPreview();
                    }
                    setCameraDisplayOrientation(camera);
                    previewCamera();
                }

                public void previewCamera() {
                    try {
                        camera.setPreviewDisplay(previewHolder);
                        camera.startPreview();
                        isPreviewRunning = true;
                    } catch (Exception e) {
                    }
                }

                public void surfaceDestroyed(SurfaceHolder arg0) {
                    camera.stopPreview();
                    camera.release();
                }

                public void startCamera() {
                    previewCamera();
                }

                public void stopCamera() {
                    camera.stopPreview();
                    camera.release();
                }

                protected static void setDisplayOrientation(Camera camera, int angle) {
                    Method downPolymorphic;

                    try {
                        downPolymorphic = camera.getClass().getMethod(
                                "setDisplayOrientation", new Class[] { int.class });
                        if (downPolymorphic != null)
                            downPolymorphic.invoke(camera, new Object[] { angle });
                    } catch (Exception e1) {
                    }

                }

                private void setCameraDisplayOrientation(Camera camera) {
                    // android.hardware.Camera.CameraInfo info = new
                    // android.hardware.Camera.CameraInfo();
                    // android.hardware.Camera.getCameraInfo(0, info);
                    // Display display = ((WindowManager) getContext().getSystemService(
                    // Context.WINDOW_SERVICE)).getDefaultDisplay();
                    // int rotation = display.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;
                    // }
                    // setDisplayOrientation(camera, result);

                    setDisplayOrientation(camera, 90);
                }

            }

Answer 1

这是我对SurfaceHolder.Callback的surfaceCreated方法的实现，它工作正常，请检查你的实现中是否缺少任何内容

public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell it where
        // to draw.
        try {
            Log.d(TAG, "surfaceCreated(), holder"+holder.toString());
            mCamera = null;
            mCamera = Camera.open();
            Log.d(TAG, "surfaceCreated(), mCamera="+mCamera);
            mCamera.setDisplayOrientation(90);
            mCamera.setPreviewDisplay(holder);
            Camera.Parameters params= mCamera.getParameters();
            params.set("jpeg-quality", 72);
            params.set("rotation", 90);
            params.set("orientation", "portrait");
            params.setPictureFormat(PixelFormat.JPEG);
                    mCamera.setParameters(params);
            createZoomlayout();

        } catch (Exception e) {
            Toast.makeText(CameraInterface.this,
                    " surfaceCreated " + e.getMessage(), Toast.LENGTH_LONG)
                    .show();
            e.printStackTrace();
        }
    }

Answer 2

使用 - setDisplayOrientation（90）; 如果它不起作用，回复..

纵向模式下的相机预览方向（三星设备）

2 个答案: