保存ArrayList的哈希映射

Question

在我的應用程序我想保存數據在savedInstanceState()。我想保存ArrayList<HashMap<String,String>>。到目前爲止，我無法做到這一點。 這裏是我的代碼是困擾我

@Override 
    protected void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     outState.putParcelableArrayList("places", (ArrayList<? extends Parcelable>) places); 

    } 

恢復（）方法

private void restore(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     //What should i do here! i have try many things but none of them is helping 

    } 

Answer 1

由於ArrayList，HashMap和String是Serializable可以使用Bundle.putSerializable和Bundle.getSerializable

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putSerializable("places", places); 
} 

private void restore(Bundle savedInstanceState) { 
    if (savedInstanceState != null) { 
     places = (ArrayList<HashMap<String,String>>) savedInstanceState.getSerializable("places"); 
    } 
} 

而且，確保你打電話給restore fr OM onRestoreInstanceState或onCreate

Answer 2

可以說u有：

ArrayList< HashMap< String,String>> arr = new ArrayList< HashMap< String,String>>(); 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putParcelableArrayList("places", (ArrayList< ? extends Parcelable>) arr); 
    } 

    @Override 
    protected void onRestoreInstanceState(Bundle savedInstanceState) { 

    ArrayList<HashMap<String,String>> a = (ArrayList<HashMap<String,String>>)savedInstanceState.get("places"); 
    /*for(int i =0; i< a.size(); i++){ 
     HashMap<String,String> map = a.get(i); 
     for(String s : map.keySet()){ 
      Log.d("log",s+" :: "+map.get(s)); 
     } 
    }*/ 
}