Android学习之简单的拍照功能
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本博客源码：Android学习之简单的拍照功能 http://download.csdn.net/detail/bq1073100909/7721211本代码里面有详细注释，就不再进行讲解，按照步骤一步一步来，并不难懂。图片保存路径因手机不同而不同，我没有使用系统提供的接口来获取路径，而是使用我手机的/mnt/sdcard2，推荐使用系统提供的接口，在前面的Android博客里面已经使用。CameraDemo.java代码：[java] view plain copy package org.dyb.camera; 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; import android.widget.Toast; public class CameraDemo extends Activity implements SurfaceHolder.Callback { private SurfaceView mPreviewSV = null; //预览SurfaceView private SurfaceHolder mySurfaceHolder = null; private AutoFocusCallback myAutoFocusCallback = null; private ImageButton mPhotoImgBtn = null; private Camera myCamera = null; private boolean isPreview = false; private Bitmap mBitmap = null; private String tag="camera"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //设置全屏无标题 requestWindowFeature(Window.FEATURE_NO_TITLE); Window myWindow = this.getWindow(); int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN; myWindow.setFlags(flag, flag); setContentView(R.layout.activity_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() { @Override public void onAutoFocus(boolean success, Camera camera) { if(success)//success表示对焦成功 { Toast.makeText(getApplicationContext(), "autofocus success", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getApplicationContext(), "autofocus false", Toast.LENGTH_SHORT).show(); } } }; 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()); } // SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。 @Override public void surfaceCreated(SurfaceHolder holder) { myCamera = Camera.open(); try { myCamera.setPreviewDisplay(mySurfaceHolder); } catch (IOException e) { if(null != myCamera){ myCamera.release(); myCamera = null; } e.printStackTrace(); } } // 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用 @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub initCamera(); } private void initCamera() { if(isPreview){ myCamera.stopPreview(); } if(myCamera != null){ 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; } } //销毁时被调用 @Override public void surfaceDestroyed(SurfaceHolder holder) { // 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; } } private class PhotoOnClickListener implements OnClickListener{ @Override public void onClick(View v) { if(isPreview && myCamera!=null){ myCamera.takePicture(myShutterCallback, null, myJpegCallback); } } } /*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; } } /*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; } private void saveJpeg(Bitmap rotaBitmap) { String savePath = "/mnt/sdcard2/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 = rotaBitmap.createScaledBitmap(rotaBitmap, 600, 800, false); rotaBitmap.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(); } } }; @Override public void onBackPressed() //无意中按返回键时要释放内存 { // TODO Auto-generated method stub super.onBackPressed(); CameraDemo.this.finish(); } } activity_photo.xml布局文件代码：[html] view plain copy <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/wish" 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> 全局配置文件：AndroidManifest.xml[html] view plain copy <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.dyb.camera" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".CameraDemo" 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> <!-- 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" /> </manifest> 0 0
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