android - 如何使用摄像头直播作为活动背景？

Question

我正在尝试制作一个需要使用摄像头实时供稿作为背景的应用程序。（我知道这是一件愚蠢的事情，但无能为力，这是客户的需求）。

我已经尝试过使用SurfaceView但到目前为止没有成功。

到目前为止，我在 Stack Overflow 上发现的更多是猜测或指导如何去做，但没有实时示例或代码帮助。如果有人在与像我这样的 Stack Overflow 用户共享一段代码之前这样做过，那就太好了。

Answer 1

看看这里：

http://developer.android.com/guide/topics/media/camera.html

制作显示相机预览的活动所需的所有代码。

Answer 2

package com.example.CameraPreview;

import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.io.IOException;

public class CameraView extends SurfaceView implements SurfaceHolder.Callback {

    private SurfaceHolder mHolder;
    private Camera mCamera;

    public CameraView(Context context) {
        super(context);
        if(checkCameraHardware(context))  {
            mCamera = getCameraInstance();
        }
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

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

        if(checkCameraHardware(context))  {
            mCamera = getCameraInstance();
        }
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        // The Surface has been created, now tell the camera where to draw the preview.
        try {
            mCamera.setPreviewDisplay(surfaceHolder);
            mCamera.startPreview();
        } catch (IOException e) {
            Log.d("CameraView", "Error setting camera preview: " + e.getMessage());
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {

        if (mHolder.getSurface() == null){
            return;
        }

        try {
            mCamera.stopPreview();
        } catch (Exception e){

        }
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();

        } catch (Exception e){
            Log.d("CameraView", "Error starting camera preview: " + e.getMessage());
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {

    }

    private boolean checkCameraHardware(Context context) {
        if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
            return true;
        } else {
            return false;
        }
    }

    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open();
        }
        catch (Exception e){
        }
        return c;
    }

}