android釋放記憶體的一個辦法，android釋放記憶體

android釋放記憶體的一個辦法，android釋放記憶體

step 1:定義一個監聽介面

public static interface OnLowMemoryListener {          void onLowMemoryReceived();      }  /* 何問起 hovertree.com */

step 2:android application檔案中添加如下代碼

 

//初始化

private ArrayList<WeakReference<OnLowMemoryListener>> mLowMemoryListeners;  /* 何問起 hovertree.com */

public MyApp() {          mLowMemoryListeners = new ArrayList<WeakReference<OnLowMemoryListener>>();      }  /* 何問起 hovertree.com */

//註冊監聽

public void registerOnLowMemoryListener(OnLowMemoryListener listener) {          if (listener != null) {              mLowMemoryListeners                      .add(new WeakReference<MyApp.OnLowMemoryListener>(listener));          }      }  //移除監聽      public void unregisterOnLowMemoryListener(OnLowMemoryListener listener) {          if (listener != null) {              int i = 0;              while (i < mLowMemoryListeners.size()) {                  final OnLowMemoryListener l = mLowMemoryListeners.get(i).get();                  if (l == null || l == listener) {                      mLowMemoryListeners.remove(i);                  } else {                      i++;                  }              }          }      }  /* 何問起 hovertree.com */

//記憶體空間過低的時候，被系統調用

@Override      public void onLowMemory() {          super.onLowMemory();          int i = 0;          while (i < mLowMemoryListeners.size()) {              final OnLowMemoryListener l = mLowMemoryListeners.get(i).get();              if (l == null) {                  mLowMemoryListeners.remove(i);              } else {                  l.onLowMemoryReceived();                  i++;              }          }      }  /* 何問起 hovertree.com */

step 3：那些浪費記憶體的地方，比片緩衝，可以實現並註冊這個監聽

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