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/

来源：oschina

链接：https://my.oschina.net/u/194999/blog/50950