java - Android 在屏幕更改时保存和恢复 ArrayList

Question

我有我用计时器拍摄的时间列表，如果我旋转屏幕，它们就会被删除。我尝试了以下代码，但它崩溃了。我认为保存/恢复格式有问题。

ArrayList<Long> timesList = new ArrayList<Long>(); // List of partial times in milliseconds

/** Save state while screen orientation changes */

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.    

  savedInstanceState.putSerializable("PartialTimes", timesList);

}


/** Restore state while screen orientation changes */

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.

  timesList = (ArrayList<Long>) savedInstanceState.getSerializable("PartialTimes");

}

Answer 1

仅用于保存

Long[] array = new Long[list.size()];
array = list.toArray(array);
savedInstanceState.putLongArray("PartialTimes", array);

并用于检索

ArrayList<Long> list = Arrays.asList(savedInstanceState.getLongArray("PartialTimes"));