取用户选择在一个离心器，其存储在共享prefences，而在另一个活动使用它 [英] Taking user selection in a spinner, storing it in sharedPrefences, and using it in another activity

问题描述

我需要的用户选择一间餐厅，获得了pretty大名单不同的选择。
那么我就需要pferably保存的选择，$ P $在类似的共享preferences。并用它在另一个活动从Excel文档显示的一些数据。

I need the user to choose a restaurant, got a pretty large list with different selections. I then need to save that choice, preferably in something like sharedPreferences. And use it in another activity to display some data from an excel document.

目前我的code是这样的：

currently my code looks like this:

在的onCreate：

in onCreate:

resturantSpinner = (Spinner) findViewById(R.id.resturantSpinner);
     // Create an ArrayAdapter using the string array and a default spinner layout
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
            R.array.resturant_arrays, android.R.layout.simple_spinner_item);
    // Specify the layout to use when the list of choices appears
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
   // Apply the adapter to the spinner
    resturantSpinner.setAdapter(adapter);

onItemSelected：

onItemSelected:

public void onItemSelected(View view) {
      int userChoice = resturantSpinner.getSelectedItemPosition();
      SharedPreferences sharedPref = getSharedPreferences("resturantFile",0);
      SharedPreferences.Editor prefEditor = sharedPref.edit();
      prefEditor.putInt("userChoiceSpinner", userChoice);
      prefEditor.commit();

}

和检索数据，在另一个活动：

And retrieving the data, in another activity:

resturantTextView = (TextView) findViewById(R.id.resturantChoice);

    Intent intent = getIntent();

    SharedPreferences sharedPref = getSharedPreferences("resturantFile",MODE_PRIVATE);
    int resturantChoice = sharedPref.getInt("userChoiceSpinner",-1);

    resturantTextView.setText("" + resturantChoice);

我只是用TextView的，看看有什么可以节省就好了，目前它只是显示-1

I just use the textView to see what it saves like, and currently it just shows -1

编辑：还不如干脆添加此，userChoice值为0

edit:might as well just add this, userChoice value is 0.

推荐答案

试试这个：

添加这样的共享preferences共享preF = getShared preferences（resturantFile，Activity.MODE_PRIVATE），而不是结果
共享preferences共享preF = getShared preferences（resturantFile，0）。

Add like this SharedPreferences sharedPref = getSharedPreferences("resturantFile",Activity.MODE_PRIVATE) instead of
SharedPreferences sharedPref = getSharedPreferences("resturantFile",0).

例如：该方法来保存

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putInt("your_int_key", yourIntValue);
editor.commit();

要检索另一个活动数据的方式：

The way to retrieve data in another activity:

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
int myIntValue = sp.getInt("your_int_key", -1);

如果不工作的话，你试试这个：
默认值为-1更改为0，

If that is not working for you then try this one: Change the default value -1 to 0,

int myIntValue = sp.getInt("your_int_key", 0);

有关详细信息，使用此<一个href=\"http://stackoverflow.com/questions/14153286/not-getting-integer-value-from-shared$p$pference\">question.

For more information use this question.

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