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一个demo，实现调用系统相机拍照，将其显示在屏幕上，并且存到sd卡。     Android中实现拍照有两种方法，一种是调用系统自带的相机，然后使用其返回的照片数据。 还有一种是自己用Camera类和其他相关类实现相机功能，这种方法定制度比较高，洗染也比较复杂，一般平常的应用只需使用第一种即可。 用Intent启动相机的代码：Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(intent, 1); 拍完照后就可以在onActivityResult(int requestCode, int resultCode, Intent data)中获取到Bitmap对象了。Bitmap bitmap = (Bitmap) data.getExtras().get("data"); 要将图像存储到sd卡之前最好先检查一下sd卡是否可用     String sdStatus = Environment.getExternalStorageState();            if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用                Log.v("TestFile",                        "SD card is not avaiable/writeable right now.");                return;            }   以下代码可以实现将图像文件存到“sdcard/myImage/”文件夹下，名称为“111.jpg”            File file = new File("/sdcard/myImage/");            file.mkdirs();// 创建文件夹            String fileName = "/sdcard/myImage/111.jpg";             try {                b = new FileOutputStream(fileName);                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件            } catch (FileNotFoundException e) {                e.printStackTrace();            } finally {                try {                    b.flush();                    b.close();                } catch (IOException e) {                    e.printStackTrace();                }            } 另外要注意的是读写sd卡文件必须首先要在Mainifest.xml文件中配置权限：           一个demo，实现调用系统相机拍照，将其显示在屏幕上，并且存到sd卡。    

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