Android拍照，上传，预览综合

附上流程图：

拍照功能：【预览尺寸有知道的朋友留言告知。】

import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; 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.os.Environment; import android.util.Log; import android.view.KeyEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import com.peacemap.photo.po.Const; /** * 拍照 * @author Administrator */ public class TakePhotoAct extends Activity implements SurfaceHolder.Callback{ private static String imgPath = Environment.getExternalStorageDirectory().getPath() + "/"+Const.imageDir; private SurfaceView surfaceView; //相机画布 private SurfaceHolder surfaceHolder; private Button takePicView,exitView; private Camera mCamera; //照相机 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //这里我在AndroidManifest.xml的activity中添加了android:theme="@android:style/Theme.NoTitleBar.Fullscreen" /** * 隐藏状态栏和标题栏 this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); requestWindowFeature(Window.FEATURE_NO_TITLE); */ //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); //横屏 /** * 获取Button并且设置事件监听 */ takePicView = (Button)this.findViewById(R.id.takepic); takePicView.setOnClickListener(TakePicListener); exitView = (Button)this.findViewById(R.id.exit); exitView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finish(); } }); surfaceView = (SurfaceView)this.findViewById(R.id.surface_camera); surfaceHolder = surfaceView.getHolder(); surfaceHolder.addCallback(this); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); checkSoftStage(); //首先检测SD卡是否存在 } /** * 检测手机是否存在SD卡,网络连接是否打开 */ private void checkSoftStage(){ if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ //判断是否存在SD卡 // String rootPath = Environment.getExternalStorageDirectory().getPath(); //获取SD卡的根目录 File file = new File(imgPath); if(!file.exists()){ file.mkdir(); } }else{ new AlertDialog.Builder(this).setMessage("检测到手机没有存储卡！请插入手机存储卡再开启本应用。") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).show(); } } /** * 点击拍照按钮,启动拍照 */ private final OnClickListener TakePicListener = new OnClickListener(){ @Override public void onClick(View v) { mCamera.autoFocus(new AutoFoucus()); //自动对焦 } }; /** * 自动对焦后拍照 * @author aokunsang * @Date 2011-12-5 */ private final class AutoFoucus implements AutoFocusCallback{ @Override public void onAutoFocus(boolean success, Camera camera) { if(success && mCamera!=null){ mCamera.takePicture(mShutterCallback, null, mPictureCallback); } } } /** * 重点对象、 此处实例化了一个本界面的PictureCallback * 当用户拍完一张照片的时候触发，这时候对图片处理并保存操作。 * */ private final PictureCallback mPictureCallback = new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { try { String fileName = System.currentTimeMillis()+".jpg"; File file = new File(imgPath,fileName); Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file)); bm.compress(Bitmap.CompressFormat.JPEG, 60, bos); bos.flush(); bos.close(); Intent intent = new Intent(TakePhotoAct.this,PictureViewAct.class); intent.putExtra("imagePath", file.getPath()); startActivity(intent); } catch (Exception e) { e.printStackTrace(); } } }; /** * 在相机快门关闭时候的回调接口，通过这个接口来通知用户快门关闭的事件， * 普通相机在快门关闭的时候都会发出响声，根据需要可以在该回调接口中定义各种动作， 例如：使设备震动 */ private final ShutterCallback mShutterCallback = new ShutterCallback() { public void onShutter() { Log.d("ShutterCallback", "...onShutter..."); } }; @Override /** * 初始化相机参数，比如相机的参数: 像素, 大小,格式 */ public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Camera.Parameters param = mCamera.getParameters(); /** * 设置拍照图片格式 */ param.setPictureFormat(PixelFormat.JPEG); /** * 设置预览尺寸【这里需要注意：预览尺寸有些数字正确，有些会报错，不清楚为啥】 */ //param.setPreviewSize(320, 240); /** * 设置图片大小 */ param.setPictureSize(Const.width, Const.height); mCamera.setParameters(param); /** * 开始预览 */ mCamera.startPreview(); } @Override /** * 打开相机,设置预览 */ public void surfaceCreated(SurfaceHolder holder) { try { mCamera = Camera.open(); //打开摄像头 mCamera.setPreviewDisplay(holder); } catch (IOException e) { mCamera.release(); mCamera = null; } } @Override /** * 预览界面被关闭时，或者停止相机拍摄;释放相机资源 */ public void surfaceDestroyed(SurfaceHolder holder) { mCamera.stopPreview(); if(mCamera!=null) mCamera.release(); mCamera = null; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_CAMERA){ //按下相机实体按键，启动本程序照相功能 mCamera.autoFocus(new AutoFoucus()); //自动对焦 return true; }else{ return false; } } }

xml：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <SurfaceView android:id="@+id/surface_camera" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" /> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <Button android:text="拍照" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/takepic" /> <Button android:text="退出" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/exit" /> </LinearLayout> </LinearLayout>

预览功能：

import java.io.File; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.AlertDialog; import android.content.ComponentName; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.LinearLayout.LayoutParams; import android.widget.ViewSwitcher.ViewFactory; import com.peacemap.photo.adapter.ImageAdapter; import com.peacemap.photo.po.Const; /** * 图片浏览 * @author aokunsang * @Date 2011-12-6 */ public class PhotoScanAct extends Activity implements ViewFactory{ private static String imgPath = Environment.getExternalStorageDirectory().getPath() + "/"+Const.imageDir; private ImageSwitcher imageSwitcher; private Gallery gallery; private List<String> photoList; private int downX,upX; private String newFilePath; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.photoscan); photoList = readFileList(); imageSwitcher = (ImageSwitcher)findViewById(R.id.switcher); imageSwitcher.setFactory(this); /* * 淡入淡出效果 */ imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); imageSwitcher.setOnTouchListener(touchListener); gallery = (Gallery)findViewById(R.id.gallery); gallery.setAdapter(new ImageAdapter(this, photoList)); gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long when) { newFilePath = photoList.get(position); Bitmap bm = BitmapFactory.decodeFile(photoList.get(position)); BitmapDrawable bd = new BitmapDrawable(bm); imageSwitcher.setImageDrawable(bd); } @Override public void onNothingSelected(AdapterView<?> arg0) {} }); } /** * 注册一个触摸事件 */ private OnTouchListener touchListener = new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if(event.getAction()==MotionEvent.ACTION_DOWN) { downX=(int) event.getX();//取得按下时的坐标 return true; } else if(event.getAction()==MotionEvent.ACTION_UP) { upX=(int) event.getX();//取得松开时的坐标 int index=0; if(upX-downX>100)//从左拖到右，即看前一张 { //如果是第一，则去到尾部 if(gallery.getSelectedItemPosition()==0) index=gallery.getCount()-1; else index=gallery.getSelectedItemPosition()-1; } else if(downX-upX>100)//从右拖到左，即看后一张 { //如果是最后，则去到第一 if(gallery.getSelectedItemPosition()==(gallery.getCount()-1)) index=0; else index=gallery.getSelectedItemPosition()+1; } //改变gallery图片所选，自动触发ImageSwitcher的setOnItemSelectedListener gallery.setSelection(index, true); return true; } return false; } }; /** * 获取SD卡中的所有图片路径 * @return */ private List<String> readFileList(){ List<String> fileList = new ArrayList<String>(); File fileDir = new File(imgPath); File[] files = fileDir.listFiles(); if(files!=null){ for(File file:files){ String fileName = file.getName(); if (fileName.lastIndexOf(".") > 0 && fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()).equals("jpg")){ fileList.add(file.getPath()); } } } return fileList; } @Override public View makeView() { ImageView imageView = new ImageView(this); imageView.setScaleType(ImageView.ScaleType.CENTER); imageView.setLayoutParams(new ImageSwitcher.LayoutParams(//自适应图片大小 LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return imageView; } //声明2个menu键按钮 public final static int ITEM_1_ID = Menu.FIRST; public final static int ITEM_2_ID = Menu.FIRST+1; @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0, ITEM_1_ID, 0, "我要上传"); menu.add(0, ITEM_2_ID, 1, "我要拍照"); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch(item.getItemId()){ case 1:{ //调出系统设置界面 Intent intent = new Intent(PhotoScanAct.this,PictureViewAct.class); intent.putExtra("imagePath",newFilePath); startActivity(intent); break; } case 2:{ //拍照 startActivity(new Intent(this,TakePhotoAct.class)); break; } } return true; } }

ImageAdapter适配器：

import java.util.List; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; /** * 图片适配器 * @author aokunsang * @Date 2011-12-6 */ public class ImageAdapter extends BaseAdapter { private List<String> picList; private Context mContext; public ImageAdapter(Context mContext,List<String> picList){ this.mContext = mContext; this.picList = picList; } @Override public int getCount() { return picList.size(); } /* (non-Javadoc) * @see android.widget.Adapter#getItem(int) */ @Override public Object getItem(int position) { // TODO Auto-generated method stub return picList.get(position); } /* (non-Javadoc) * @see android.widget.Adapter#getItemId(int) */ @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView image = new ImageView(mContext); Bitmap bm = BitmapFactory.decodeFile(picList.get(position)); image.setImageBitmap(bm); image.setScaleType(ImageView.ScaleType.CENTER_CROP); image.setLayoutParams(new Gallery.LayoutParams(100, 100)); return image; } }

xml:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageSwitcher android:id="@+id/switcher" android:layout_width="match_parent" android:layout_height="match_parent" ></ImageSwitcher> <Gallery android:id="@+id/gallery" android:layout_width="match_parent" android:background="#55000000" android:layout_height="100dip" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:gravity="center_vertical" android:spacing="8dip" /> </RelativeLayout>

上传工具类：

import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.Map; import java.util.Map.Entry; import android.util.Log; import com.peacemap.photo.po.FileInfo; /** * POST上传文件 * @author aokunsang * @Date 2011-12-6 */ public class PostFile { private static PostFile postFile = new PostFile(); private final static String LINEND = "\r\n"; private final static String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线 private final static String PREFIX = "--"; private final static String MUTIPART_FORMDATA = "multipart/form-data"; private final static String CHARSET = "utf-8"; private final static String CONTENTTYPE = "application/octet-stream"; private PostFile(){} public static PostFile getInstance(){ return postFile; } /** * HTTP上传文件 * @param actionUrl 请求服务器的路径 * @param params 传递的表单内容 * @param files 多个文件信息 * @return */ public String post(String actionUrl,Map<String,String> params,FileInfo[] files){ try { URL url = new URL(actionUrl); HttpURLConnection urlConn = (HttpURLConnection)url.openConnection(); urlConn.setDoOutput(true); //允许输出 urlConn.setDoInput(true); //允许输入 urlConn.setUseCaches(false); urlConn.setRequestMethod("POST"); urlConn.setRequestProperty("connection", "Keep-Alive"); urlConn.setRequestProperty("Charset", CHARSET); urlConn.setRequestProperty("Content-Type", MUTIPART_FORMDATA+";boundary="+BOUNDARY); DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream()); //构建表单数据 String entryText = bulidFormText(params); Log.i("-------描述信息---------------", entryText); dos.write(entryText.getBytes()); StringBuffer sb = new StringBuffer(""); for(FileInfo file : files){ sb.append(PREFIX).append(BOUNDARY).append(LINEND); sb.append("Content-Disposition: form-data; name=\""+file.getFileTextName()+"\"; filename=\""+file.getFile().getAbsolutePath()+"\""+LINEND); sb.append("Content-Type:"+CONTENTTYPE+";charset="+CHARSET+LINEND); sb.append(LINEND); dos.write(sb.toString().getBytes()); InputStream is = new FileInputStream(file.getFile()); byte[] buffer = new byte[1024]; int len = 0; while ((len = is.read(buffer)) != -1) { dos.write(buffer, 0, len); } is.close(); dos.write(LINEND.getBytes()); } //请求的结束标志 byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes(); dos.write(end_data); dos.flush(); //----------------------------------- 发送请求数据结束 ---------------------------- //---------------------------------- 接收返回信息 ------------------------ int code = urlConn.getResponseCode(); if(code!=200){ urlConn.disconnect(); return ""; }else{ BufferedReader br = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); String result = ""; String line = null; while((line = br.readLine())!=null){ result += line; } br.close(); urlConn.disconnect(); return result; } } catch (Exception e) { Log.e("--------上传图片错误--------", e.getMessage()); return null; } } /** * HTTP上传单个文件 * @param actionUrl 请求服务器的路径 * @param params 传递的表单内容 * @param files 单个文件信息 * @return */ public String post(String actionUrl,Map<String,String> params,FileInfo fileInfo){ return post(actionUrl, params, new FileInfo[]{fileInfo}); } /** * 封装表单文本数据 * @param paramText * @return */ private String bulidFormText(Map<String,String> paramText){ if(paramText==null || paramText.isEmpty()) return ""; StringBuffer sb = new StringBuffer(""); for(Entry<String,String> entry : paramText.entrySet()){ sb.append(PREFIX).append(BOUNDARY).append(LINEND); sb.append("Content-Disposition:form-data;name=\"" + entry.getKey() + "\"" + LINEND); // sb.append("Content-Type:text/plain;charset=" + CHARSET + LINEND); sb.append(LINEND); sb.append(entry.getValue()); sb.append(LINEND); } return sb.toString(); } /** * 封装文件文本数据 * @param files * @return */ private String buildFromFile(FileInfo[] files){ StringBuffer sb = new StringBuffer(); for(FileInfo file : files){ sb.append(PREFIX).append(BOUNDARY).append(LINEND); sb.append("Content-Disposition: form-data; name=\""+file.getFileTextName()+"\"; filename=\""+file.getFile().getAbsolutePath()+"\""+LINEND); sb.append("Content-Type:"+CONTENTTYPE+";charset="+CHARSET+LINEND); sb.append(LINEND); } return sb.toString(); } }

(1)根据Camera Activity返回的时候，会带一个名为data的Bitmap对象，照片的缩略图（这个地方可以做各种修改，我没用到不说了），上代码：

@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); checkSoftStage(); try { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, TAKE_PICTURE); } catch (Exception e) { e.printStackTrace(); } } /** * 检测手机是否存在SD卡,网络连接是否打开 */ private void checkSoftStage(){ if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ //判断是否存在SD卡 File file = new File(imgPath); if(!file.exists()){ file.mkdir(); } }else{ new AlertDialog.Builder(this).setMessage("检测到手机没有存储卡！请插入手机存储卡再开启本应用。") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).show(); } } protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == TAKE_PICTURE) { // 拍照Activity保存图像数据的key是data，返回的数据类型是Bitmap对象 Bitmap cameraBitmap = (Bitmap) data.getExtras().get("/sdcard/rtest.jpg"); // 在ImageView组件中显示拍摄的照片 image.setImageBitmap(cameraBitmap); // 做自己的业务操作。。。。 } super.onActivityResult(requestCode, resultCode, data); }

(2)以上代码在我的小米手机上测试时，出现问题了。 返回的name为data的Bitmap对象是个Null,我发现小米照完相片之后，他会先跳到一个预览的界面(系统自带的页面)，所以得不到Bitmap对象了。