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我使用MediaOnCompletionListener來釋放對象，所以它非常重要。但是，正如您從下面的logcat代碼片段中看到的那樣，它並不總是觸發的！爲什麼MediaPlayer的onCompletionListener如此不可靠？
12-30 17:24:41.448: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:41.638: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:41.818: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:49.866: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:24:50.136: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:24:50.186: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:24:55.902: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:56.152: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:56.322: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:24:56.552: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:25:04.340: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:25:04.560: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:25:04.670: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:25:04.910: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:25:37.312: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:25:37.592: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:25:37.773: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:25:37.953: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:25:46.161: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:25:46.351: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:26:09.423: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:26:35.108: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:26:42.215: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:26:50.594: I/myApp(5117): MediaOnCompletionListener triggered
12-30 17:27:17.059: I/myApp(5117): playSound(/mnt/sdcard/audio/clong-1.mp3 VolumePercent:100)
12-30 17:27:25.448: I/myApp(5117): MediaOnCompletionListener triggered
我在Android 2.3.5 測試這這是一個已知的問題？ MediaPlayer的可靠性在更高版本的Android上有所提高嗎？
您確定在沒有打印日誌的情況下，您的'OnCompletionListener'實際上已註冊到'MediaPlayer'嗎？可能需要附加一個調試器來確認相關字段在運行時是否爲非null。或者，IIRC，如果您在播放過程中的某個時刻設置了'setLooping（true）'，則在每個'循環'後都不會使用回調（除非在完成之前將其設置回「false」）。 –
當OnCompleition觸發時，確定啓動MediaPlayer的線程仍處於活動狀態嗎？ 檢查此問題可能有所幫助： http://stackoverflow.com/questions/13875146/ensure-mediaplayer-oncompletionlistener-is-called-and-the-thread-is-not-dead/14061862#14061862 – iTech