无法在使用phonegap 2.4的android上播放录音

Question

我试图在phonegap中使用Media对象录制音频文件，然后播放它。我没有录制问题，但是当我试图播放它时，我的应用程序在我的模拟器和我的设备上都关闭了。在日志上它说:"空指针异常在org.apache.cordova.readyPlayer (AudioPlayer.java)"。非常感谢任何愿意帮助我的人，我花了一段时间才意识到我完全迷失在这里。这是我从http://docs.phonegap.com/en/2.4.0/cordova_media_media.md.html#media.stopRecord复制的代码，并在。stoprecord()之后添加。play()。如果需要，我可以添加清单和活动，我怀疑问题在那里，但我可能错了。 index . html:

<script type="text/javascript" charset="utf-8" src="cordova-2.4.0.js"></script>
<script type="text/javascript" charset="utf-8">
// Wait for Cordova to load
//
document.addEventListener("deviceready", onDeviceReady, false);
// Record audio
// 
function recordAudio() {
    var src = "myrecording.amr";
    var mediaRec = new Media(src, onSuccess, onError);
    // Record audio
    mediaRec.startRecord();
    // Stop recording after 10 sec
    var recTime = 0;
    var recInterval = setInterval(function() {
        recTime = recTime + 1;
        setAudioPosition(recTime + " sec");
        if (recTime >= 10) {
            clearInterval(recInterval);
            mediaRec.stopRecord();
            document.getElementById('audio_position').innerHTML = "finished";
            **mediaRec.play();**
        }
    }, 1000);
}
// Cordova is ready
//
function onDeviceReady() {
    recordAudio();
}
// onSuccess Callback
//
function onSuccess() {
    console.log("recordAudio():Audio Success");
}
// onError Callback 
//
function onError(error) {
    alert('code: '    + error.code    + 'n' + 
          'message: ' + error.message + 'n');
}
// Set audio position
// 
function setAudioPosition(position) {
    document.getElementById('audio_position').innerHTML = position;
}
</script>

<p id="media">Recording audio...</p>
<p id="audio_position"></p>

、

Answer 1

我在Cordova 3.5(带有Media插件0.2.11)和Android 4.4中发现了同样的问题。解决方案如上所述。基本上，像这样的代码应该可以达到这个目的:

mediaRec.stopRecord();
src = mediaRec.src;  // if you don't have src defined anymore
mediaRec.release();
mediaPlay = new Media(src, onSuccess, onError);
mediaPlay.play();

Answer 2

不需要创建其他Media对象来播放先前录制的文件。只需执行以下操作-您必须在录制停止后释放媒体对象:

// variable in global scope
var mediaRec = 0;
// function to record an audio
function recordAudio() {
  // create media object for your recording
  mediaRec = new Media("phonegap_rec.amr", onMediaRecordSuccess, onMediaRecordError);
  // start recording
  mediaRec.startRecord();
  // recording for 5 seconds
  var recTime = 0;
    var recInterval = setInterval(function() {
        recTime = recTime + 1;
        if (recTime >= 5) {
            clearInterval(recInterval);
            // stop recording after 5 seconds
            mediaRec.stopRecord();
            // release the media object (THIS IS THE KEY SOLUTION HERE)
            mediaRec.release();
        }
    }, 1000);
}
// function to playback recorded audio
function playRecord() {
  // check if the object exists
  if (mediaRec) {
    // now you can playback the recording
    mediaRec.play();
  }
}