/**
 * 利用照相机拍照
 * @author Administrator
 *
 */
public class CameraAcitivity extends Activity{

    SurfaceView sView;
    SurfaceHolder surfaceHolder;
    int screenWidth, screenHeight;
    // 定义系统所用的照相机
    Camera camera;
    //是否在浏览中
    boolean isPreview = false;
    private static final int TAKE_PICTURE = 1;  
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.take_pic);
        Button btn = (Button) this.findViewById(R.id.btn_take_pic);
        btn.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //调用摄像头拍照  
                startActivityForResult(intent, TAKE_PICTURE);  
            }
        });
    
    }

    @Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
      String filename = "";  
      try {  
        if (resultCode == Activity.RESULT_OK && requestCode == TAKE_PICTURE) {  
          Bundle bundle = data.getExtras();  
          Bitmap bmp = (Bitmap)bundle.get("data");  
          filename = saveImage(bmp);  
　　　　　　//此处不知道该如何展示多次拍照保存的图片
          ImageView show = (ImageView) findViewById(R.id.show);
          show.setImageBitmap(bmp);
        }  
      } catch (Exception err) {  
          err.printStackTrace();
        Log.e("Exception", err.getLocalizedMessage());  
      }  
    }  
      
    
    public String saveImage(Bitmap bmp) throws Exception {  
          File file = new File(buildFileName());  
//          file.createNewFile();  
          FileOutputStream oStream = new FileOutputStream(file);  
          bmp.compress(Bitmap.CompressFormat.JPEG, 100, oStream); //100是照片质量，0-100，越大越好  
          oStream.flush();  
          oStream.close();  
          return file.getPath();  
        } 
    
    
    public String buildFileName(){  
          Date now = new Date();  
          SimpleDateFormat formater = new SimpleDateFormat("yyMMdd_HHmmss");  
          String newPath = "";
          newPath = newPath.replace("/mnt/sdcard", "");
          String SDCARD = Environment.getExternalStorageDirectory() + "/";  
          String basePath = SDCARD + "dier/photo/";  
          
          File dir = new File(basePath);  
          dir.mkdirs();  
            
          return basePath+formater.format(now) + ".jpg";  
        }
}

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".CameraActivity" >
<RelativeLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:paddingBottom="8dp"
        android:orientation="horizontal"
    >
  <Button 
      android:id="@+id/btn_take_pic"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="takePic"
      />
  </RelativeLayout>
  <RelativeLayout 
          android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="4dp"
        android:paddingBottom="8dp"
        android:orientation="horizontal">
       <ImageView
        android:id="@+id/show"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"/>
</RelativeLayout>
</RelativeLayout>