[置顶] Android 防内存泄露handler
16lz
2021-01-23
Android 防内存泄露handler
1.使用弱引用 WeakRefHander
/** * 作者: allen on 15/11/24.感谢开源作者https://coding.net/u/coding/p/Coding-Android/git */ /** * 弱引用 handler 防止内存泄露 */ public class WeakRefHander extends Handler { private final WeakReference<Handler.Callback> mRef; private final int mLoopTime; private int NO_LOOP = -1; private int what =0; /** * 循环 * * @param loopAction * @param loopTime */ public WeakRefHander(Handler.Callback loopAction, int loopTime) { super(); this.mRef = new WeakReference<>(loopAction); this.mLoopTime = loopTime; } /** * 不循环 * * @param loopAction */ public WeakRefHander(Handler.Callback loopAction) { super(); mRef = new WeakReference<>(loopAction); mLoopTime = NO_LOOP; } @Override public void handleMessage(Message msg) { Handler.Callback action = mRef.get(); if (action != null) { action.handleMessage(msg); if (mLoopTime != NO_LOOP) { sendEmptyMessageDelayed(what, mLoopTime); } } } public void start() { removeMessages(0); sendEmptyMessageDelayed(0, 0); } public void start(int what, long delay) { this.what = what; removeMessages(what); sendEmptyMessageDelayed(what, delay); } public void stop() { removeMessages(what); } public void clear() { removeMessages(what); mRef.clear(); } }2. 实现 Activity implements WeakRefHander.Callback
3. 在handleMessage处理业务逻辑
示例代码:
public class MainActivity extends AppCompatActivity implements WeakRefHander.Callback { private WeakRefHander weakRefHander; private static final int HANDLER_MESSAGE_START = 1001; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); weakRefHander = new WeakRefHander(this, 1); weakRefHander.start(HANDLER_MESSAGE_START, 1000 * 30); } @Override public boolean handleMessage(Message msg) { switch (msg.what) { case HANDLER_MESSAGE_START: //Todo 处理业务逻辑 break; default: break; } return true; } @Override public void onResume() { super.onResume(); weakRefHander.start(); } @Override public void onPause() { weakRefHander.stop(); super.onPause(); } @Override protected void onDestroy() { weakRefHander.clear(); super.onDestroy(); } }-Github示例参考代码
参考作者：-Coding-Android作者
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