0

我一生都无法弄清楚如何保存一个int。我要做的就是保存leftCounter到一个文件中，并在我重新启动代码时检索它。

public class SalesTrack extends Activity {

   byte leftCounter = 0;
   byte centerCounter = 0;
   byte rightCounter = 0;
   int total;
   int x, y, z;

   public static final String PREFS = "data";

   TextView counterAAL, counterUPG, counterNL, counterTotal;

   private final String LEFTY = "6";

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_sales_track);

       counterAAL = (TextView) findViewById(R.id.left_number);
       counterUPG = (TextView) findViewById(R.id.center_number);
       counterNL = (TextView) findViewById(R.id.right_number);
       counterTotal = (TextView) findViewById(R.id.total);

       SharedPreferences sharedPref = this.getSharedPreferences(LEFTY, 0);
       sharedPref.getInt("data", leftCounter);
       counterAAL.setText(PREFS);
   }

   public void LeftInc(View v) {
       leftCounter++;
       counterAAL.setText("" + leftCounter);
       Refresh();
   }

   public void LeftDec(View v) {
       leftCounter--;
       counterAAL.setText("" + leftCounter);
       Refresh();
   }

   public void CenterInc(View v) {
       centerCounter++;
       counterUPG.setText("" + centerCounter);
       Refresh();
   }

   public void CenterDec(View v) {
       centerCounter--;
       counterUPG.setText("" + centerCounter);
       Refresh();
   }

   public void RightInc(View v) {
       rightCounter++;
       counterNL.setText("" + rightCounter);
       Refresh();
   }

   public void RightDec(View v) {
       rightCounter--;
       counterNL.setText("" + rightCounter);
       Refresh();
   }

   // Refresh Total after every click.
   public void Refresh() {
       x = leftCounter * 10;
       y = centerCounter * 20;
       z = rightCounter * 35;
       total = x + y + z;
       counterTotal.setText("" + total);

       SharedPreferences sharedPref = getSharedPreferences(PREFS, 0);
       SharedPreferences.Editor editor = sharedPref.edit();
       editor.putInt("data", leftCounter);
       editor.commit();
   }
}
4

6 回答 6

2

你的代码有错误。

// SharedPreferences sharedPref = getSharedPreferences(PREFS, 0); (This line is wrong)
      SharedPreferences sharedPref = getSharedPreferences(LEFTY, 0);
      SharedPreferences.Editor editor = sharedPref.edit();
      editor.putInt("data", leftCounter);
      editor.commit();
于 2013-01-23T06:25:52.693 回答
0

您将获得具有两个不同名称的首选项LEFTY和PREFS. 鉴于名称，我认为您想更改以下行onCreate 

SharedPreferences sharedPref = this.getSharedPreferences(LEFTY, 0);

至

SharedPreferences sharedPref = this.getSharedPreferences(PREFS, 0);
于 2013-01-23T06:30:09.570 回答
0 
SharedPreferences sharedPref = getSharedPreferences(LEFTY, 0);
SharedPreferences.Editor editor = sharedPref .edit();               
editor.putInt("data", leftCounter);
editor.commit();
于 2013-01-23T06:30:22.653 回答
0

您正在保存名为的data内部首选项PREFS并通过首选项名称获取LEFTY

尝试将您的首选项名称从更改LEFTY为PREFSunder onCreate()。

protected void onCreate(Bundle savedInstanceState) 
{
...
SharedPreferences sharedPref = this.getSharedPreferences(PREFS, 0);
}
于 2013-01-23T06:35:38.930 回答
0

所以你从文件中获取数据，但它被检测为String？

您可以使用 parse 函数将其转换String为Integer

int counter = Integer.parseInt(stringvalue);
于 2013-01-23T06:24:11.353 回答
0

改成这样

SharedPreferences sharedPref = = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt("data", leftCounter);
editor.commit();
于 2013-01-23T06:34:48.107 回答