getActiveNetworkInfo 后未释放 android wakelock

Question

我想每隔 x 分钟自动检查一次互联网连接并将数据发送到服务器。然而，以下(最少的)代码在 Eclipse 中给出了警告，表示 release() 调用并不总是到达。

PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
wl.acquire();

// check active network
ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
// start a service that uploads data
wl.release();

我不明白 wl.release() 怎么可能不会被调用所以这是 Eclipse 中的错误还是我遗漏了什么？我绝对不希望我的应用导致唤醒锁定。

Answer 1

I don't see how wl.release() could possibly not be called

好吧，如果不出意外，您没有处理任何异常。如果 acquire() 和 release() 之间的某些东西引发了 RuntimeException，您将崩溃并泄漏 WakeLock。使用这个:

PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
wl.acquire();

try {
  // check active network
  ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
  NetworkInfo info = cm.getActiveNetworkInfo();
  // start a service that uploads data
}
finally {
  wl.release();
}