轉載聲明:Ryan的博客文章歡迎您的轉載,但在轉載的同時,請註明文章的來源出處,不勝感激! :-) java
http://my.oschina.net/ryanhoo/blog/86865 android
上一篇博客中,咱們學習到了如何使用Android相冊截圖。在這篇博客中,我將向你們展現如何拍照截圖。 git
拍照截圖有點兒特殊,要知道,如今的Android智能手機的攝像頭都是幾百萬的像素,拍出來的圖片都是很是大的。所以,咱們不能像對待相冊截圖同樣使用Bitmap小圖,不管大圖小圖都統一使用Uri進行操做。 github
1、首先準備好須要使用到的Uri: 學習
private static final String IMAGE_FILE_LOCATION = "file:///sdcard/temp.jpg";//temp file Uri imageUri = Uri.parse(IMAGE_FILE_LOCATION);//The Uri to store the big bitmap
2、使用MediaStore.ACTION_IMAGE_CAPTURE能夠輕鬆調用Camera程序進行拍照: spa
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//action is capture intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); startActivityForResult(intent, TAKE_BIG_PICTURE);//or TAKE_SMALL_PICTURE3、接下來就能夠在 onActivityResult中拿到返回的數據(Uri),並將Uri傳遞給截圖的程序。
switch (requestCode) { case TAKE_BIG_PICTURE: Log.d(TAG, "TAKE_BIG_PICTURE: data = " + data);//it seems to be null //TODO sent to crop cropImageUri(imageUri, 800, 400, CROP_BIG_PICTURE); break; case TAKE_SMALL_PICTURE: Log.i(TAG, "TAKE_SMALL_PICTURE: data = " + data); //TODO sent to crop cropImageUri(imageUri, 300, 150, CROP_SMALL_PICTURE); break; default: break; }能夠看到,不管是拍大圖片仍是小圖片,都是使用的Uri,只是尺寸不一樣而已。咱們將這個操做封裝在一個方法裏面。
private void cropImageUri(Uri uri, int outputX, int outputY, int requestCode){ Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); intent.putExtra("crop", "true"); intent.putExtra("aspectX", 2); intent.putExtra("aspectY", 1); intent.putExtra("outputX", outputX); intent.putExtra("outputY", outputY); intent.putExtra("scale", true); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); intent.putExtra("return-data", false); intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); intent.putExtra("noFaceDetection", true); // no face detection startActivityForResult(intent, requestCode); }4、最後一步,咱們已經將數據傳入裁剪圖片程序,接下來要作的就是處理返回的數據了:
switch (requestCode) { case CROP_BIG_PICTURE://from crop_big_picture Log.d(TAG, "CROP_BIG_PICTURE: data = " + data);//it seems to be null if(imageUri != null){ Bitmap bitmap = decodeUriAsBitmap(imageUri); imageView.setImageBitmap(bitmap); } break; case CROP_SMALL_PICTURE: if(imageUri != null){ Bitmap bitmap = decodeUriAsBitmap(imageUri); imageView.setImageBitmap(bitmap); }else{ Log.e(TAG, "CROP_SMALL_PICTURE: data = " + data); } break; default: break; }
效果圖: .net
代碼託管於GitHub,會不按期更新:https://github.com/ryanhoo/PhotoCropper code
基礎篇: orm