Rexsee API介绍：Android照片、视频拍摄，Camera扩展

Android的Camera包含取景（preview）和拍摄照片（take picture）的功能。其实Camera的功能还是比较简单，只是需要注意其架构分成客户端和服务器两个部分，它们建立在Android的进程间通讯Binder的结构上。
Rexsee的扩展中除了对于Camera的支持，同时还可结合外部的一些开源代码实现对照片的快速处理，可以实现类似于美图秀秀、Camera360等的效果。。关于一些具体的应用Demo可以在Rexsee项目中心查阅： http://www.rexsee.com/project/index.php
【函数】 void takePicture() 【函数】 void takePicture(int quality) 【说明】拍摄照片。拍摄成功触发事件onTakePictureSuccessed，失败则触发onTakePictureFailed。【返回】无【参数】 quality：0表示较低质量，1表示较高质量，为方便上传，默认为0。【示例】 rexseeCamera.takePicture();
【函数】 void takeVideo() 【函数】 void takeVideo(int quality) 【说明】拍摄视频。拍摄成功触发事件onTakeVideoSuccessed，失败则触发onTakeVideoFailed。【返回】无【参数】 quality：0表示较低质量，1表示较高质量，为方便上传，默认为0。【示例】 rexseeCamera.takeVideo();
【函数】 void upload(String action,String name) 【说明】将拍摄好的照片或视频直接上传。通常在onTakePictureSuccessed或onTakeVideoSuccessed事件中调用。【返回】无【参数】 action：上传的服务器程序url，等同于HTML中<form action="......">中的action。 name：上传名称，等同于HTML中<input type="file" name="......">中的name。 action指向的服务器程序和HTML中表单对应的程序相同，示例的服务器程序参见rexseeUpload对象。
rexseeCamera.java源码

/* * Copyright (C) 2011 The Rexsee Open Source Project * * Licensed under the Rexsee License, Version 1.0 (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.rexsee.com/CN/legal/license.html * * 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 rexsee.multimedia;   import rexsee.core.browser.ActivityResult.ActivityResultListener;  import rexsee.core.browser.JavascriptInterface;  import rexsee.core.browser.RexseeBrowser;  import rexsee.core.browser.UrlListener;  import rexsee.core.lang.RexseeLanguage;  import rexsee.core.transportation.RexseeUpload;  import android.app.Activity;  import android.content.ContentResolver;  import android.content.Context;  import android.content.Intent;  import android.database.Cursor;  import android.net.Uri;  import android.provider.MediaStore;   public class RexseeCamera implements JavascriptInterface {          private static final String INTERFACE_NAME = "Camera";         @Override         public String getInterfaceName() {                 return mBrowser.application.resources.prefix + INTERFACE_NAME;         }         @Override         public JavascriptInterface getInheritInterface(RexseeBrowser childBrowser) {                 return this;         }         @Override         public JavascriptInterface getNewInterface(RexseeBrowser childBrowser) {                 return new RexseeCamera(childBrowser);         }          public static final String EVENT_ONTAKEPICTURESUCCESSED = "onTakePictureSuccessed";         public static final String EVENT_ONTAKEPICTUREFAILED = "onTakePictureFailed";         public static final String EVENT_ONTAKEVIDEOSUCCESSED = "onTakeVideoSuccessed";         public static final String EVENT_ONTAKEVIDEOFAILED = "onTakeVideoFailed";          public static final String URI_MEDIA_IMAGE = "content://media/external/images/media";         public static final String URI_MEDIA_VIDEO = "content://media/external/video/media";          private String mediaFile = null;          private final RexseeBrowser mBrowser;         public RexseeCamera(RexseeBrowser browser) {                  mBrowser = browser;                 browser.eventList.add(EVENT_ONTAKEPICTURESUCCESSED);                 browser.eventList.add(EVENT_ONTAKEPICTUREFAILED);                 browser.eventList.add(EVENT_ONTAKEVIDEOSUCCESSED);                 browser.eventList.add(EVENT_ONTAKEVIDEOFAILED);                  browser.urlListeners.add(new UrlListener(mBrowser.application.resources.prefix + ":images") {                         @Override                         public void run(Context context, final RexseeBrowser browser, final String url) {                                 new Thread() {                                         @Override                                         public void run() {                                                 String html = "<HTML><HEAD><TITLE>" + url + "</TITLE></HEAD>";                                                 html += "<BODY style='margin:0px;background-color:black;color:white;'>";                                                 ContentResolver contentResolver = mBrowser.getContext().getContentResolver();                                                 browser.progressDialog.show(RexseeLanguage.PROGRESS_ONGOING);                                                 Cursor cursor = contentResolver.query(Uri.parse(URI_MEDIA_IMAGE), new String[]{"_id", "_data"}, null, null, "_id desc");                                                 html += "<table width=100% cellspacing=0 style='color:white;font-size:16px;'>";                                                 if (cursor.getCount() == 0) {                                                         html += "<tr><td style='padding:10px;'>No image found.</td></tr>";                                                 } else {                                                         for (int i = 0; i < cursor.getCount(); i++) {                                                                 cursor.moveToPosition(i);                                                                 html += "<tr><td onclick=\"" + browser.function.getInterfaceName() + ".go('" + URI_MEDIA_IMAGE + "/" + cursor.getInt(0) + "');\" style='border-bottom:1px solid #222222; padding:10 5 10 5;word-break:break-all;'>" + cursor.getString(1) + "</td></tr>";                                                         }                                                 }                                                 cursor.close();                                                 html += "</table>";                                                 html += "</BODY>";                                                 html += "</HTML>";                                                 browser.function.loadHTMLWithoutHistory(html);                                         }                                 }.start();                         }                         @Override                         public boolean shouldAddToHistory(Context context, RexseeBrowser browser, String url) {                                 return true;                         }                 });                 browser.urlListeners.add(new UrlListener(mBrowser.application.resources.prefix + ":video") {                         @Override                         public void run(Context context, final RexseeBrowser browser, final String url) {                                 new Thread() {                                         @Override                                         public void run() {                                                 String html = "<HTML><HEAD><TITLE>" + url + "</TITLE></HEAD>";                                                 html += "<BODY style='margin:0px;background-color:black;color:white;'>";                                                 ContentResolver contentResolver = mBrowser.getContext().getContentResolver();                                                 browser.progressDialog.show(RexseeLanguage.PROGRESS_ONGOING);                                                 Cursor cursor = contentResolver.query(Uri.parse(URI_MEDIA_VIDEO), new String[]{"_id", "_data"}, null, null, "_id desc");                                                 html += "<table width=100% cellspacing=0 style='color:white;font-size:16px;'>";                                                 if (cursor.getCount() == 0) {                                                         html += "<tr><td style='padding:10px;'>No video found.</td></tr>";                                                 } else {                                                         for (int i = 0; i < cursor.getCount(); i++) {                                                                 cursor.moveToPosition(i);                                                                 html += "<tr><td onclick=\"" + browser.function.getInterfaceName() + ".go('" + URI_MEDIA_VIDEO + "/" + cursor.getInt(0) + "');\" style='border-bottom:1px solid #222222; padding:10 5 10 5;word-break:break-all;'>" + cursor.getString(1) + "</td></tr>";                                                         }                                                 }                                                 cursor.close();                                                 html += "</table>";                                                 html += "</BODY>";                                                 html += "</HTML>";                                                 browser.function.loadHTMLWithoutHistory(html);                                         }                                 }.start();                         }                         @Override                         public boolean shouldAddToHistory(Context context, RexseeBrowser browser, String url) {                                 return true;                         }                 });          }         public String getLastMediaImage() {                 ContentResolver contentResolver = mBrowser.getContext().getContentResolver();                 Cursor cursor = contentResolver.query(Uri.parse(URI_MEDIA_IMAGE), new String[]{"_data"}, null, null, "_id desc");                 if (cursor == null || cursor.getCount() == 0) return null;                 cursor.moveToFirst();                 String rtn = "file://" + cursor.getString(0);                 cursor.close();                 return rtn;         }         public String getLastMediaVideo() {                 ContentResolver contentResolver = mBrowser.getContext().getContentResolver();                 Cursor cursor = contentResolver.query(Uri.parse(URI_MEDIA_VIDEO), new String[]{"_data"}, null, null, "_id desc");                 if (cursor == null || cursor.getCount() == 0) return "";                 cursor.moveToFirst();                 String rtn = "file://" + cursor.getString(0);                 cursor.close();                 return rtn;         }          // JavaScript Interface          public void takePicture() {                 takePicture(0);         }         public void takePicture(int quality) {                 try {                         Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);                         intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, (quality == 0) ? 0 : 1);                         mBrowser.activityResult.start(intent, new ActivityResultListener() {                                 @Override                                 public void run(int resultCode, Intent resultIntent) {                                         if (resultCode == Activity.RESULT_OK) {                                                 mediaFile = getLastMediaImage();                                                 mBrowser.eventList.run(EVENT_ONTAKEPICTURESUCCESSED, new String[]{mediaFile});                                         } else {                                                 mediaFile = null;                                                 mBrowser.eventList.run(EVENT_ONTAKEPICTUREFAILED);                                         }                                 }                         });                 } catch (Exception e) {                         mBrowser.exception(getInterfaceName(), e);                 }         }          public void takeVideo() {                 takeVideo(0);         }         public void takeVideo(int quality) {                 try {                         Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);                         intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, (quality == 0) ? 0 : 1);                         mBrowser.activityResult.start(intent, new ActivityResultListener() {                                 @Override                                 public void run(int resultCode, Intent resultIntent) {                                         if (resultCode == Activity.RESULT_OK) {                                                 mediaFile = getLastMediaVideo();                                                 mBrowser.eventList.run(EVENT_ONTAKEVIDEOSUCCESSED, new String[]{mediaFile});                                         } else {                                                 mediaFile = null;                                                 mBrowser.eventList.run(EVENT_ONTAKEVIDEOFAILED);                                         }                                 }                         });                 } catch (Exception e) {                         mBrowser.exception(getInterfaceName(), e);                 }         }          public void prepareUpload() {                 if (mediaFile == null || mediaFile == "") {                         mBrowser.exception(getInterfaceName(), "Picture or video is not ready.");                 } else {                         RexseeUpload uploadObject = (RexseeUpload) mBrowser.interfaceList.get(mBrowser.application.resources.prefix + RexseeUpload.INTERFACE_NAME);                         if (uploadObject == null) {                                 mBrowser.exception(getInterfaceName(), "Upload object is not ready.");                         } else {                                 uploadObject.selectedFiles.add(mediaFile);                         }                 }         }          public void upload(String action, String name) {                 if (mediaFile == null || mediaFile == "") {                         mBrowser.exception(getInterfaceName(), "Picture or video is not ready.");                 } else {                         RexseeUpload uploadObject = (RexseeUpload) mBrowser.interfaceList.get(mBrowser.application.resources.prefix + RexseeUpload.INTERFACE_NAME);                         if (uploadObject == null) {                                 mBrowser.exception(getInterfaceName(), "Upload object is not ready.");                         } else {                                 uploadObject.clear();                                 uploadObject.selectedFiles.add(mediaFile);                                 uploadObject.upload(action, name);                         }                 }         }   }

仅对Rexsee的源码和函数事件做了整理，相关的demo或源码解析可以在Rexsee社区了解，目前Rexsee已提供了近2000个扩展，覆盖Android原生功能超过90%，且全部开放： http://www.rexsee.com/

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