Rexsee API介绍：Android音频录制，AudioRecorder函数与源码

Audio系统在Android中负责音频方面输入/输出层次，一般负责播放PCM声音输出和从外部获取PCM声音，以及管理声音设备和设置。这里主要是谈谈其中录制这块：AudioRecorder。相对于MediaRecorder来说，AudioRecorder更接近底层，为我们封装的方法也更少。而且音频的采样率、声道等等都可以参数配置，但是问题是在模拟器中AudioRecorder却不怎么好用。
关于Audio系统中其它几个类，如AudioCapture、AudioPlayer，也可以在rexsee的开源社区里找到： http://www.rexsee.com/CN/helpReference.php
【函数】 void record() 【说明】录制音频。录制成功触发事件onRecordAudioSuccessed，失败则触发onRecordAudioFailed。【返回】无【示例】

rexseeAudioRecorder.record();

【函数】 void upload(String action,String name) 【说明】将录制好的音频直接上传，通常在onRecordAudioSuccessed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。
rexseeAudioRecorder.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.Audio.Media;   public class RexseeAudioRecorder implements JavascriptInterface {          private static final String INTERFACE_NAME = "AudioRecorder";         @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 RexseeAudioRecorder(childBrowser);         }          public static final String EVENT_ONRECORDAUDIOSUCCESSED = "onRecordAudioSuccessed";         public static final String EVENT_ONRECORDAUDIOFAILED = "onRecordAudioFailed";          public static final String URI_MEDIA_AUDIO = "content://media/external/audio/media";          private String mediaFile = null;          private final RexseeBrowser mBrowser;          public RexseeAudioRecorder(RexseeBrowser browser) {                  mBrowser = browser;                 browser.eventList.add(EVENT_ONRECORDAUDIOSUCCESSED);                 browser.eventList.add(EVENT_ONRECORDAUDIOFAILED);                  browser.urlListeners.add(new UrlListener(mBrowser.application.resources.prefix + ":audio") {                         @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_AUDIO), 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;'> audio 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_AUDIO + "/" + 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 getLastMediaAudio() {                 ContentResolver contentResolver = mBrowser.getContext().getContentResolver();                 Cursor cursor = contentResolver.query(Uri.parse(URI_MEDIA_AUDIO), 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;         }          public void record() {                 try {                         Intent intent = new Intent(Media.RECORD_SOUND_ACTION);                         mBrowser.activityResult.start(intent, new ActivityResultListener() {                                 @Override                                 public void run(int resultCode, Intent resultIntent) {                                         if (resultCode == Activity.RESULT_OK) {                                                 mediaFile = getLastMediaAudio();                                                 mBrowser.eventList.run(EVENT_ONRECORDAUDIOSUCCESSED, new String[]{mediaFile});                                         } else {                                                 mediaFile = null;                                                 mBrowser.eventList.run(EVENT_ONRECORDAUDIOFAILED);                                         }                                 }                         });                 } catch (Exception e) {                         mBrowser.exception(getInterfaceName(), e);                 }         }          public void prepareUpload() {                 if (mediaFile == null) {                         mBrowser.exception(getInterfaceName(), "Audio 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) {                         mBrowser.exception(getInterfaceName(), "Audio 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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