本文共 10522 字,大约阅读时间需要 35 分钟。
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。如果不支持不间断聚焦,setFocusMode就改成!!!
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-sdk
- android: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" />
- <application
- android:icon="@drawable/ic_launcher"
- android:label="@string/app_name"
- android:theme="@style/AppTheme" >
- <activity
- android: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" >
- <TextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/BestWish"
- tools:context=".RectPhoto" />
- <FrameLayout
- android:layout_width="wrap_content"
- android:layout_height="wrap_content" >
- <SurfaceView
- android:id="@+id/previewSV"
- android:layout_width="fill_parent"
- android:layout_height="800px" />
- </FrameLayout>
- <ImageButton
- android: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SurfaceView
- private SurfaceHolder mySurfaceHolder = null;
- private ImageButton mPhotoImgBtn = null;
- private Camera myCamera = null;
- private Bitmap mBitmap = null;
- private AutoFocusCallback myAutoFocusCallback = null;
- @Override
- public 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SurfaceView
- mPreviewSV = (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 stub
- if(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64×64
- LayoutParams 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 block
- if(null != myCamera){
- myCamera.release();
- myCamera = null;
- }
- e.printStackTrace();
- }
- }
- public void surfaceDestroyed(SurfaceHolder holder)
- //销毁时被调用
- {
- // TODO Auto-generated method stub
- Log.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 stub
- Log.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 stub
- Log.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 stub
- Log.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sdcard
- if(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 stub
- if(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 block
- Log.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 stub
- if(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;
- }
- }
- @Override
- public void onBackPressed()
- //无意中按返回键时要释放内存
- {
- // TODO Auto-generated method stub
- super.onBackPressed();
- RectPhoto.this.finish();
- }
- }
源码下载链接:
转载地址:https://blog.csdn.net/jdsjlzx/article/details/9103747 如侵犯您的版权,请留言回复原文章的地址,我们会给您删除此文章,给您带来不便请您谅解!