在微调器中进行用户选择，将其存储在sharedPreferences中，并在其他活动中使用它 [英] Taking user selection in a spinner, storing it in sharedPreferences, and using it in another activity

问题描述

我需要用户选择一家餐馆，并获得了很多不同选择的清单. 然后，我需要保存该选择，最好保存在诸如sharedPreferences之类的东西中.并在另一个活动中使用它来显示来自excel文档的一些数据.

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.

当前我的代码如下:

在onCreate中:

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();
}

并在另一个活动中检索数据:

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);

我只是使用textView查看它保存的内容，目前它只显示-1

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

不妨添加此内容，userChoice值为0.

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

推荐答案

尝试一下:

像这样添加SharedPreferences sharedPref = getSharedPreferences("resturantFile",Activity.MODE_PRIVATE)而不是
SharedPreferences sharedPref = getSharedPreferences("resturantFile",0).

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

例如:保存方式

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

在另一个活动中检索数据的方式:

The way to retrieve data in another activity:

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

如果这对您不起作用，请尝试以下一种方法: 将默认值-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);

有关更多信息，请使用此问题.

For more information use this question.

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