所以我有我的主要活动,它拥有一个列表视图,并有一个地图,其中包含我的所有列表数据。单击项目后,您将进入详细信息显示。当我按下后退按钮从详细活动返回主活动时,如果我设置了一个断点,我的地图键仍然完好无损,但对象中的所有字符串都是“”,整数是-1。这是我的主要活动的样子:
public class MainActivity extends Activity {
private Map<String, Stunt> stunts = new LinkedHashMap<String, Stunt>();
private StuntsDao stuntsDao;
private ListAdapter listAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stuntsDao = new StuntsDao(getApplicationContext());
stunts = stuntsDao.getAllStunts();
listAdapter = new ListAdapter(this, R.layout.list_layout, new ArrayList<Stunt>(stunts.values()));
ListView listView = (ListView)findViewById(R.id.listView);
listView.setAdapter(listAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String stuntName = (String)((ViewHolder)view.getTag()).stuntName.getText();
Intent myIntent = new Intent(getApplicationContext(), StuntDetails.class);
getStuntDetailsIfNeeded(stuntName);
Stunt stunt = stunts.get(stuntName);
myIntent.putExtra("STUNT", stunt);
startActivity(myIntent);
}
});
}
...
}
为什么我的地图中的对象基本上是空的?