Android调用摄像头

package cn.net.xuefei.myfacedetect;

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

import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MainActivity extends Activity implements SurfaceHolder.Callback {

    private SurfaceView surfaceview;
    private SurfaceHolder surfaceholder;
    private Camera camera = null;
    Camera.Parameters parameters;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        surfaceview = (SurfaceView) findViewById(R.id.surfaceview);
        surfaceholder = surfaceview.getHolder();
        surfaceholder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        surfaceholder.addCallback(MainActivity.this);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // TODO Auto-generated method stub

        camera.autoFocus(new AutoFocusCallback() {
            @Override
            public void onAutoFocus(boolean success, Camera camera) {
                if (success) {
                    initCamera();// 实现相机的参数初始化
                    camera.cancelAutoFocus();// 只有加上了这一句，才会自动对焦。
                }
            }

        });
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        // 获取camera对象
        camera = Camera.open();
        try {
            // 设置预览监听
            camera.setPreviewDisplay(holder);
            Camera.Parameters parameters = camera.getParameters();

            if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
                parameters.set("orientation", "portrait");
                camera.setDisplayOrientation(90);
                parameters.setRotation(90);
            } else {
                parameters.set("orientation", "landscape");
                camera.setDisplayOrientation(0);
                parameters.setRotation(0);
            }
            camera.setParameters(parameters);
            // 启动摄像头预览
            camera.startPreview();
            System.out.println("camera.startpreview");

        } catch (IOException e) {
            e.printStackTrace();
            camera.release();
            System.out.println("camera.release");
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        if (camera != null) {
            camera.stopPreview();
            camera.release();
        }
    }

    // 相机参数的初始化设置
    private void initCamera() {
        parameters = camera.getParameters();
        parameters.setPictureFormat(PixelFormat.JPEG);
        // parameters.setPictureSize(surfaceView.getWidth(),
        // surfaceView.getHeight()); // 部分定制手机，无法正常识别该方法。
        //parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
        parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦
        setDispaly(parameters, camera);
        camera.setParameters(parameters);
        camera.startPreview();
        camera.cancelAutoFocus();// 2如果要实现连续的自动对焦，这一句必须加上

    }

    // 控制图像的正确显示方向
    private void setDispaly(Camera.Parameters parameters, Camera camera) {
        if (Integer.parseInt(Build.VERSION.SDK) >= 8) {
            setDisplayOrientation(camera, 90);
        } else {
            parameters.setRotation(90);
        }

    }

    // 实现的图像的正确显示
    private void setDisplayOrientation(Camera camera, int i) {
        Method downPolymorphic;
        try {
            downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
            if (downPolymorphic != null) {
                downPolymorphic.invoke(camera, new Object[] { i });
            }
        } catch (Exception e) {
            Log.e("Came_e", "图像出错");
        }
    }
}

<RelativeLayout 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="${relativePackage}.${activityClass}" >

    <SurfaceView
        android:id="@+id/surfaceview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.net.xuefei.myfacedetect"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="14" />

    <!-- 摄像头权限 -->
    <uses-permission android:name="android.permission.CAMERA" />
    <!-- SD卡读写权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

参考文章
http://blog.sina.com.cn/s/blog_5a48dd2d0100tmcn.html

http://www.cnblogs.com/over140/archive/2011/11/16/2251344.html

http://blog.csdn.net/lin772662623/article/details/8578548

http://blog.csdn.net/geekstart/article/details/13630009

http://www.cnblogs.com/linlf03/p/3682385.html