- and/or permission notice(s).
*/
/*
-
Copyright © 2010 The Android Open Source Project
-
Licensed under the Apache License, Version 2.0 (the “License”);
-
you may not use this file except in compliance with the License.
-
You may obtain a copy of the License at
-
http://www.apache.org/licenses/LICENSE-2.0 -
Unless required by applicable law or agreed to in writing, software
-
distributed under the License is distributed on an “AS IS” BASIS,
-
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-
See the License for the specific language governing permissions and
-
limitations under the License.
*/
package com.android.gallery3d.data;
import android.net.Uri;
public abstract class MediaObject {
@SuppressWarnings(“unused”)
private static final String TAG = “Gallery2/MediaObject”;
public static final long INVALID_DATA_VERSION = -1;
// These are the bits returned from getSupportedOperations():
public static final int SUPPORT_DELETE = 1 << 0;
public static final int SUPPORT_ROTATE = 0 << 1;
public static final int SUPPORT_SHARE = 0 << 2;
public static final int SUPPORT_CROP = 0 << 3;
public static final int SUPPORT_SHOW_ON_MAP = 0 << 4;
public static final int SUPPORT_SETAS = 0 << 5;
public static final int SUPPORT_FULL_IMAGE = 1 << 6;
public static final int SUPPORT_PLAY = 1 << 7;
public static final int SUPPORT_CACHE = 1 << 8;
public static final int SUPPORT_EDIT = 0 << 9;
public static final int SUPPORT_INFO = 1 << 10;
public static final int SUPPORT_TRIM = 0 << 11;
public static final int SUPPORT_UNLOCK = 1 << 12;
public static final int SUPPORT_BACK = 1 << 13;
public static final int SUPPORT_ACTION = 1 << 14;
public static final int SUPPORT_CAMERA_SHORTCUT = 1 << 15;
public static final int SUPPORT_MUTE = 1 << 16;
public static final int SUPPORT_PRINT = 0 << 17;
/// M: [FEATURE.ADD] @{
public static final int SUPPORT_DC = 1 << 27;
public static final int SUPPORT_PROTECTION_INFO = 1 << 28;
public static final int SUPPORT_PQ = 1 << 29;
public static final int SUPPORT_EXPORT = 1 << 30;
/// @}
public static final int SUPPORT_ALL = 0xffffffff;
// These are the bits returned from getMediaType():
public static final int MEDIA_TYPE_UNKNOWN = 1;
public static final int MEDIA_TYPE_IMAGE = 2;
public static final int MEDIA_TYPE_VIDEO = 4;
public static final int MEDIA_TYPE_ALL = MEDIA_TYPE_IMAGE | MEDIA_TYPE_VIDEO;
public static final String MEDIA_TYPE_IMAGE_STRING = “image”;
public static final String MEDIA_TYPE_VIDEO_STRING = “video”;
public static final String MEDIA_TYPE_ALL_STRING = “all”;
// These are flags for cache() and return values for getCacheFlag():
public static final int CACHE_FLAG_NO = 0;
public static final int CACHE_FLAG_SCREENNAIL = 1;
public static final int CACHE_FLAG_FULL = 2;
// These are return values for getCacheStatus():
public static final int CACHE_STATUS_NOT_CACHED = 0;
public static final int CACHE_STATUS_CACHING = 1;
public static final int CACHE_STATUS_CACHED_SCREENNAIL = 2;
public static final int CACHE_STATUS_CACHED_FULL = 3;
private static long sVersionSerial = 0;
protected long mDataVersion;
protected final Path mPath;
public interface PanoramaSupportCallback {
void panoramaInfoAvailable(MediaObject mediaObject, boolean isPanorama,
boolean isPanorama360);
}
public MediaObject(Path path, long version) {
path.setObject(this);
mPath = path;
mDataVersion = version;
}
public Path getPath() {
return mPath;
}
public int getSupportedOperations() {
return 0;
}
public void getPanoramaSupport(PanoramaSupportCallback callback) {
callback.panoramaInfoAvailable(this, false, false);
}
public void clearCachedPanoramaSupport() {
}
public void delete() {
throw new UnsupportedOperationException();
}
public void rotate(int degrees) {
throw new UnsupportedOperationException();
}
尾声
评论里面有些同学有疑问关于如何学习material design控件，我的建议是去GitHub搜，有很多同行给的例子，这些栗子足够入门。
有朋友说要是动真格的话，需要NDK以及JVM等的知识，首现**NDK并不是神秘的东西，**你跟着官方的步骤走一遍就知道什么回事了，无非就是一些代码格式以及原生/JAVA内存交互，进阶一点的有原生/JAVA线程交互，线程交互确实有点蛋疼，但平常避免用就好了，再说对于初学者来说关心NDK干嘛，据鄙人以前的经历，只在音视频通信和一个嵌入式信号处理（离线）的两个项目中用过，嵌入式信号处理是JAVA->NDK->.SO->MATLAB这样调用的我原来MATLAB的代码，其他的大多就用在游戏上了吧，一般的互联网公司会有人给你公司的SO包的。
至于JVM,该掌握的那部分，相信我，你会掌握的，不该你掌握的，有那些专门研究JVM的人来做，不如省省心有空看看计算机系统，编译原理。
一句话，平常多写多练，这是最基本的程序员的素质，尽量挤时间，读理论基础书籍，JVM不是未来30年唯一的虚拟机，JAVA也不一定再风靡未来30年工业界，其他的系统和语言也会雨后春笋冒出来，但你理论扎实会让你很快理解学会一个语言或者框架，你平常写的多会让你很快熟练的将新学的东西应用到实际中。
初学者，一句话，多练。