Question

我是Android编程的新手，我想做的就是在表面视图中打开相机应用程序，以便我可以打开相机并设置一些参数如下？

Camera camera = Camera.open();
 Parameters p = camera.getParameters();
 p.setFlashMode(Parameters.FLASH_MODE_ON);
 camera.setParameters(p);
 camera.startPreview();        
 camera.release();

我发现评论说我必须通过表面。所以我创建了以下表面：

package com.example.fcloader;

import java.io.IOException;

import android.content.Context;
import android.view.SurfaceView;
import android.view.SurfaceHolder;
import android.hardware.Camera;


public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback
{
        private SurfaceHolder holder;
        private Camera camera;

        public CameraSurfaceView(Context context) 
        {
                super(context);

                //Initiate the Surface Holder properly
                this.holder = this.getHolder();
                this.holder.addCallback(this);
                this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) 
        {
                try
                {
                        //Open the Camera in preview mode
                        this.camera = Camera.open();
                        this.camera.setPreviewDisplay(this.holder);
                }
                catch(IOException ioe)
                {
                        ioe.printStackTrace(System.out);
                }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) 
        {
                // Now that the size is known, set up the camera parameters and begin
                // the preview.
                Camera.Parameters parameters = camera.getParameters();
                parameters.setPreviewSize(width, height);
                camera.setParameters(parameters);
                camera.startPreview();
        }


        @Override
        public void surfaceDestroyed(SurfaceHolder holder) 
        {
                // Surface will be destroyed when replaced with a new screen
                //Always make sure to release the Camera instance
                camera.stopPreview();
                camera.release();
                camera = null;
        }

        public Camera getCamera()
        {
                return this.camera;
        }
}

这是我上网的基本表面代码。我的问题是，我应该改变什么来使这些事情相互协调？

Answer 1

在camera.startPreview()之后，你必须写preview.setCamera(camera)来设置相机。 preview是您的类的对象，它扩展SurfaceView并实现SurfaceHolder.Callback。

camera.startPreview();
preview.setCamera(camera);

Answer 2

清单应包括以下内容：

 <uses-permission android:name="android.permission.CAMERA" />
 <uses-feature android:name="android.hardware.camera" />
 <uses-feature android:name="android.hardware.camera.autofocus" />

您是否在广告布局中添加了CameraSurfaceView？您可以在layout.xml中部署它，也可以通过onCreate()以编程方式将其添加到layout.addView。

在空白surfaceView中打开相机

2 个答案: