Android: This Handler class should be static or leaks might occur

0x00

private Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case 0: mTextView.setText("msg received"); break; } } };

以往我習慣這樣改變Android的UI,但是Android Studio Warning：
This Handler class should be static or leaks might occur.

0x01

原因比較簡單，msg發送的時候有一個delayed參數，如果在delayed參數以內該activity被destory了，但是mHandler還持有mContext等待接收消息，所以會引發內存泄漏。

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solve idea:

private final MyHandler mHandler = new MyHandler(this); private static class MyHandler extends Handler { private final WeakReference<VideoFragment> mVideoFragment; public MyHandler(VideoFragment m) { mVideoFragment = new WeakReference<VideoFragment>(m); } @Override public void handleMessage(Message msg) { VideoFragment m = mVideoFragment.get(); if (m != null) { switch (msg.what) { case 0: m.mTextView.setText("msg received"); break; default:break; } } }}

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