<manifest ... ><uses-feature android:name="android.hardware.camera" />...
</manifest ... >

private void dispatchTakePictureIntent(int actionCode) {Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(takePictureIntent, actionCode);
}

//查询是否有程序能够照相
public static boolean isIntentAvailable(Context context, String action) {final PackageManager packageManager = context.getPackageManager();final Intent intent = new Intent(action);List<ResolveInfo> list =packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);return list.size() > 0;
}

//获取Bitmap并显示
private void handleSmallCameraPhoto(Intent intent) {Bundle extras = intent.getExtras();mImageBitmap = (Bitmap) extras.get("data");mImageView.setImageBitmap(mImageBitmap);
}

//保存图像
storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), getAlbumName()
);
//或者用下面的目录
storageDir = new File (Environment.getExternalStorageDirectory()+ PICTURES_DIR+ getAlbumName()
);private File createImageFile() throws IOException {// Create an image file nameString timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_";File image = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX, getAlbumDir());mCurrentPhotoPath = image.getAbsolutePath();return image;
}

File f = createImageFile();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));

private void galleryAddPic() {Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);File f = new File(mCurrentPhotoPath);Uri contentUri = Uri.fromFile(f);mediaScanIntent.setData(contentUri);this.sendBroadcast(mediaScanIntent);
}

private void setPic() {// Get the dimensions of the Viewint targetW = mImageView.getWidth();int targetH = mImageView.getHeight();// Get the dimensions of the bitmapBitmapFactory.Options bmOptions = new BitmapFactory.Options();bmOptions.inJustDecodeBounds = true;BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);int photoW = bmOptions.outWidth;int photoH = bmOptions.outHeight;// Determine how much to scale down the imageint scaleFactor = Math.min(photoW/targetW, photoH/targetH);// Decode the image file into a Bitmap sized to fill the ViewbmOptions.inJustDecodeBounds = false;bmOptions.inSampleSize = scaleFactor;bmOptions.inPurgeable = true;Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);mImageView.setImageBitmap(bitmap);
}