本文主要是介绍2013新春奉送：Android摄像头开发完美demo---(循环聚焦,缩放大小,旋转picture,查询支持的picturesize, ImageButton按键效果）...，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
除夕之夜，程序员还在编代码。http://blog.csdn.net/yanzi1225627/article/details/7926994这是我几个月前写的代码，现在看来真是垃圾不堪阿。变量名字不规范，整个架构拉杂，几乎没有注释，程序不稳键，没有安全退出，导致摄像头下次不可用。
这个代码几乎涉及到了摄像头开发的所有方面，（除了PreviewCallback，这块东西我会结合android摄像头自动识别人脸/火灾来谈)，且力求精简，是杂家的心血阿！相对之前改进之处有：
1,精简。只有一个ImageButton用来实现按下拍照。拍照后自动保存，进入预览界面。 不像原来的要三个按键：预览/拍照/保存。
2,聚焦方面实现不间断循环聚焦。 不像之前的，要按一下按键聚焦一次。
3,ImageButton增加了按下的效果。按之前示例如下：
，点击后背景变暗，有种风车旋转的感觉。
4,增加了查询摄像头PictureSizes和PreviewSize的代码，调试程序时应先查询出自己的参数然后配置。不同的手机参数不同。另外，预览surfaceView的高我设为800px，如果手机屏幕太小，这个参数要改。
5,改进了之前的按back返回按键退出程序后，再次进入程序camera没有释放，致使程序挂掉的问题。
6,改进了预览时手机横竖屏切换时，程序挂掉的毛病。但这里的布局还是采用默认的竖屏。
7,在实现循环聚焦的同时，保留了autoFocus（）接口。可以测试出，在使用FOCUS_MODE_CONTINUOUS_VIDEO聚焦模式下，autoFocus不发挥作用。
8,注释更加良好。
废话不说了请看源码：
第一部分：Manifinest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="yan.guoqi.rectphoto"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="8"android:targetSdkVersion="15" /><!-- 增加文件存储和访问摄像头的权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.CAMERA" /><uses-feature android:name="android.hardware.camera" /><applicationandroid:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name=".RectPhoto"android:label="@string/title_activity_rect_photo" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/BestWish"tools:context=".RectPhoto" /><FrameLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content" ><SurfaceViewandroid:id="@+id/previewSV"android:layout_width="fill_parent"android:layout_height="800px" /></FrameLayout><ImageButtonandroid:id="@+id/photoImgBtn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/photo_img_btn"android:layout_gravity="center" /></LinearLayout>package yan.guoqi.rectphoto;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;public class RectPhoto extends Activity implements SurfaceHolder.Callback{private static final String tag="yan";private boolean isPreview = false;private SurfaceView mPreviewSV = null; //预览SurfaceViewprivate SurfaceHolder mySurfaceHolder = null;private ImageButton mPhotoImgBtn = null;private Camera myCamera = null;private Bitmap mBitmap = null;private AutoFocusCallback myAutoFocusCallback = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//设置全屏无标题requestWindowFeature(Window.FEATURE_NO_TITLE);int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;Window myWindow = this.getWindow();myWindow.setFlags(flag, flag);setContentView(R.layout.activity_rect_photo);//初始化SurfaceViewmPreviewSV = (SurfaceView)findViewById(R.id.previewSV);mySurfaceHolder = mPreviewSV.getHolder();mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明 transparent透明mySurfaceHolder.addCallback(this);mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//自动聚焦变量回调myAutoFocusCallback = new AutoFocusCallback() {public void onAutoFocus(boolean success, Camera camera) {// TODO Auto-generated method stubif(success)//success表示对焦成功{Log.i(tag, "myAutoFocusCallback: success...");//myCamera.setOneShotPreviewCallback(null);}else{//未对焦成功Log.i(tag, "myAutoFocusCallback: 失败了...");}}};mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);//手动设置拍照ImageButton的大小为120×120,原图片大小是64×64LayoutParams lp = mPhotoImgBtn.getLayoutParams();lp.width = 120;lp.height = 120; mPhotoImgBtn.setLayoutParams(lp); mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());}/*下面三个是SurfaceHolder.Callback创建的回调函数*/public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) // 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用{// TODO Auto-generated method stub Log.i(tag, "SurfaceHolder.Callback:surfaceChanged!");initCamera();}public void surfaceCreated(SurfaceHolder holder) // SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。{// TODO Auto-generated method stub myCamera = Camera.open();try {myCamera.setPreviewDisplay(mySurfaceHolder);Log.i(tag, "SurfaceHolder.Callback: surfaceCreated!");} catch (IOException e) {// TODO Auto-generated catch blockif(null != myCamera){myCamera.release();myCamera = null;}e.printStackTrace();}}public void surfaceDestroyed(SurfaceHolder holder) //销毁时被调用{// TODO Auto-generated method stubLog.i(tag, "SurfaceHolder.Callback：Surface Destroyed");if(null != myCamera){myCamera.setPreviewCallback(null); /*在启动PreviewCallback时这个必须在前不然退出出错。这里实际上注释掉也没关系*/myCamera.stopPreview(); isPreview = false; myCamera.release();myCamera = null; }}//初始化相机public void initCamera(){if(isPreview){myCamera.stopPreview();}if(null != myCamera){ Camera.Parameters myParam = myCamera.getParameters();// //查询屏幕的宽和高// WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);// Display display = wm.getDefaultDisplay();// Log.i(tag, "屏幕宽度："+display.getWidth()+" 屏幕高度:"+display.getHeight());myParam.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式// //查询camera支持的picturesize和previewsize// List<Size> pictureSizes = myParam.getSupportedPictureSizes();// List<Size> previewSizes = myParam.getSupportedPreviewSizes();// for(int i=0; i<pictureSizes.size(); i++){// Size size = pictureSizes.get(i);// Log.i(tag, "initCamera:摄像头支持的pictureSizes: width = "+size.width+"height = "+size.height);// }// for(int i=0; i<previewSizes.size(); i++){// Size size = previewSizes.get(i);// Log.i(tag, "initCamera:摄像头支持的previewSizes: width = "+size.width+"height = "+size.height);//// }//设置大小和方向等参数myParam.setPictureSize(1280, 960);myParam.setPreviewSize(960, 720); //myParam.set("rotation", 90); myCamera.setDisplayOrientation(90); myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);myCamera.setParameters(myParam); myCamera.startPreview();myCamera.autoFocus(myAutoFocusCallback);isPreview = true;}}/*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/ShutterCallback myShutterCallback = new ShutterCallback() //快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。{public void onShutter() {// TODO Auto-generated method stubLog.i(tag, "myShutterCallback:onShutter...");}};PictureCallback myRawCallback = new PictureCallback() // 拍摄的未压缩原数据的回调,可以为null{public void onPictureTaken(byte[] data, Camera camera) {// TODO Auto-generated method stubLog.i(tag, "myRawCallback:onPictureTaken...");}};PictureCallback myJpegCallback = new PictureCallback() //对jpeg图像数据的回调,最重要的一个回调{public void onPictureTaken(byte[] data, Camera camera) {// TODO Auto-generated method stubLog.i(tag, "myJpegCallback:onPictureTaken...");if(null != data){mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//data是字节数据，将其解析成位图myCamera.stopPreview();isPreview = false;}//设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation", 90)失效。图片竟然不能旋转了，故这里要旋转下Matrix matrix = new Matrix();matrix.postRotate((float)90.0);Bitmap rotaBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, false);//保存图片到sdcardif(null != rotaBitmap){saveJpeg(rotaBitmap);}//再次进入预览myCamera.startPreview();isPreview = true;}};//拍照按键的监听public class PhotoOnClickListener implements OnClickListener{public void onClick(View v) {// TODO Auto-generated method stubif(isPreview && myCamera!=null){myCamera.takePicture(myShutterCallback, null, myJpegCallback); }}}/*给定一个Bitmap，进行保存*/public void saveJpeg(Bitmap bm){String savePath = "/mnt/sdcard/rectPhoto/";File folder = new File(savePath);if(!folder.exists()) //如果文件夹不存在则创建{folder.mkdir();}long dataTake = System.currentTimeMillis();String jpegName = savePath + dataTake +".jpg";Log.i(tag, "saveJpeg:jpegName--" + jpegName);//File jpegFile = new File(jpegName);try {FileOutputStream fout = new FileOutputStream(jpegName);BufferedOutputStream bos = new BufferedOutputStream(fout);// //如果需要改变大小(默认的是宽960×高1280),如改成宽600×高800// Bitmap newBM = bm.createScaledBitmap(bm, 600, 800, false);bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);bos.flush();bos.close();Log.i(tag, "saveJpeg：存储完毕！");} catch (IOException e) {// TODO Auto-generated catch blockLog.i(tag, "saveJpeg:存储失败！");e.printStackTrace();}}/*为了使图片按钮按下和弹起状态不同，采用过滤颜色的方法.按下的时候让图片颜色变淡*/public class MyOnTouchListener implements OnTouchListener{public final float[] BT_SELECTED=new float[]{ 2, 0, 0, 0, 2,0, 2, 0, 0, 2,0, 0, 2, 0, 2,0, 0, 0, 1, 0 }; public final float[] BT_NOT_SELECTED=new float[]{ 1, 0, 0, 0, 0,0, 1, 0, 0, 0,0, 0, 1, 0, 0,0, 0, 0, 1, 0 };public boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubif(event.getAction() == MotionEvent.ACTION_DOWN){v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));v.setBackgroundDrawable(v.getBackground());}else if(event.getAction() == MotionEvent.ACTION_UP){v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));v.setBackgroundDrawable(v.getBackground());}return false;}}@Overridepublic void onBackPressed()//无意中按返回键时要释放内存{// TODO Auto-generated method stubsuper.onBackPressed();RectPhoto.this.finish();}
}
源码下载链接： http://download.csdn.net/detail/yanzi1225627/5060323
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注：代码不能正常运行的请看上面第4条，修改相关参数。
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