Android 应用程序启动时打开摄像头

我正在制作一个应用程序，在应用程序启动时打开相机作为背景，类似于snapchat。我当前使用的代码中有不推荐的部分，我不知道如何修复它们。感谢您的帮助。我的代码如下

public class CameraView extends SurfaceView implements SurfaceHolder.Callback {

private SurfaceHolder mHolder;
private Camera mCamera;

public CameraView(Context context, Camera camera) {

    super(context);
    mCamera = camera;
    mCamera.setDisplayOrientation(90);
    //get the holder and set this class as the callback, so we can get camera data here
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_NORMAL);
}

public CameraView(Launcher launcher, android.hardware.Camera mCamera) {
    super(launcher, (AttributeSet) mCamera);
}

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    try{
        //when the surface is created, we can set the camera to draw images in this surfaceholder
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d("ERROR", "Camera error on surfaceCreated " + e.getMessage());
    }
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {
    //before changing the application orientation, you need to stop the preview, rotate and then start it again
    if(mHolder.getSurface() == null)//check if the surface is ready to receive camera data
        return;

    try{
        mCamera.stopPreview();
    } catch (Exception e){
        //this will happen when you are trying the camera if it's not running
    }

    //now, recreate the camera preview
    try{
        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d("ERROR", "Camera error on surfaceChanged " + e.getMessage());
    }
}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    mCamera.stopPreview();
    mCamera.release();
}

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/camera_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>

</FrameLayout>

问题是这些行已被弃用

mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
mCamera.stopPreview();
mCamera.release();

下面是我的Xml

public class CameraView extends SurfaceView implements SurfaceHolder.Callback {

private SurfaceHolder mHolder;
private Camera mCamera;

public CameraView(Context context, Camera camera) {

    super(context);
    mCamera = camera;
    mCamera.setDisplayOrientation(90);
    //get the holder and set this class as the callback, so we can get camera data here
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_NORMAL);
}

public CameraView(Launcher launcher, android.hardware.Camera mCamera) {
    super(launcher, (AttributeSet) mCamera);
}

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    try{
        //when the surface is created, we can set the camera to draw images in this surfaceholder
        mCamera.setPreviewDisplay(surfaceHolder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d("ERROR", "Camera error on surfaceCreated " + e.getMessage());
    }
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {
    //before changing the application orientation, you need to stop the preview, rotate and then start it again
    if(mHolder.getSurface() == null)//check if the surface is ready to receive camera data
        return;

    try{
        mCamera.stopPreview();
    } catch (Exception e){
        //this will happen when you are trying the camera if it's not running
    }

    //now, recreate the camera preview
    try{
        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();
    } catch (IOException e) {
        Log.d("ERROR", "Camera error on surfaceChanged " + e.getMessage());
    }
}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    mCamera.stopPreview();
    mCamera.release();
}

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/camera_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </FrameLayout>

</FrameLayout>

---

您的项目设置或导入有问题-旧的camera API已被弃用，但这并不妨碍以任何方式使用它

如果您的代码段是所有代码，则至少缺少包导入。如果没有，请发布您收到的实际错误消息

---

Android Studio可能会发出警告，但如果一切都设置正确的话，就是这样。

它唯一不推荐的版本。这并不意味着它就不工作了。如果您想使用最新的代码，请使用

Camera2 API

。我如何实现这一点，当我运行应用程序时，它不起作用，并且不推荐的代码显示为错误。它显示了什么错误？它说它无法解决方法SDK的最低版本是什么？