如何保存應用程序關閉一個價值和檢索應用程序時，打開了再次

Question

我要救totalBalance在這場比賽中，當應用程序被關閉，再次檢索它變成textView5當用戶再次播放應用程序...但我試圖和它給我什麼請幫我...我怎麼需要在這做什麼？

public class Main extends Activity implements OnClickListener { 

private ArrayList<ToggleButton> mToggleButtons = new ArrayList<ToggleButton>(); 
public static TextView textView1, textView2, textView3, textView4, 
     textView5, textView6; 
Button button1; 
ToggleButton t; 
int i; 
int randomNumber; 
float winingPrize = 0; 
float totalBalance = 0; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.main); 

    textView1 = (TextView) findViewById(R.id.textView1); 
    textView2 = (TextView) findViewById(R.id.textView2); 
    textView3 = (TextView) findViewById(R.id.textView3); 
    textView4 = (TextView) findViewById(R.id.textView4); 
    textView5 = (TextView) findViewById(R.id.textView5); 
    textView6 = (TextView) findViewById(R.id.textView6); 

    button1 = (Button) findViewById(R.id.button1); 

    ToggleButton cb = null; 

    for (i = 1; i <= 9; i++) { 
     cb = new ToggleButton(this); 
     cb.setText(Integer.toString(i)); 
     cb.setTextOn(Integer.toString(i)); 
     cb.setTextOff(Integer.toString(i)); 
     cb.setBackgroundResource(R.drawable.check); 
     cb.setOnClickListener(this); 
     cb.setId(i); 
     registerForContextMenu(cb); 
     mToggleButtons.add(cb); 
    } 

    GridView gridView = (GridView) findViewById(R.id.gridview); 
    gridView.setAdapter(new CustomAdapter(mToggleButtons)); 
    gridView.setOnItemClickListener(new OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View v, 
       int position, long id) { 

      // Button b1 = (Button) findViewById(R.id.button1); 
      // TextView textView2 = (TextView) findViewById(R.id.textView1); 
      // textView2.setText(Integer.toString(i)); 

     } 
    }); 
} 

@Override 
public void onClick(View v) { 

    // Making a array list and when we click on button1 its checkes 
    // which of the togglebuttons are selected 
    final ArrayList<Integer> positive_IDs = new ArrayList<Integer>(); 
    for (int i = 0; i < mToggleButtons.size(); i++) { 
     ToggleButton b = mToggleButtons.get(i); 
     if (b.isChecked()) { 
      // putting all buttons id that are checked into 
      // arrayList 
      positive_IDs.add(b.getId()); 
     } 
    } 
    textView6.setText("Selected Numbers : " + positive_IDs.toString()); 
    // Toast.makeText(getBaseContext(), positive_IDs.toString() + 
    // " Enabled", Toast.LENGTH_SHORT).show(); 

    textView3.setText("Total Number Selected = " 
      + Integer.toString(positive_IDs.size())); 

    switch (positive_IDs.size()) { 
    case 1: { 
     winingPrize = .5f; 
     break; 
    } 
    case 2: { 
     winingPrize = .25f; 
     break; 
    } 
    case 3: { 
     winingPrize = .1f; 
     break; 
    } 
    case 4: { 
     winingPrize = .05f; 
     break; 
    } 
    case 5: { 
     winingPrize = .01f; 
     break; 
    } 
    case 6: { 
     winingPrize = .00f; 
     break; 
    } 
    } 
    textView4.setText("Wining Prize = Rs: " 
      + String.format("%.2f", winingPrize)); 

    final Button button = (Button) findViewById(R.id.button1); 
    button.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      // Do something in response to button click 

      // Genrating random number Random number 
      Random rn = new Random(); 
      randomNumber = (int) rn.nextInt(9) + 1; 

      // changes textView1 equals to random number 
      textView1.setText("Random Number is " 
        + Integer.toString(randomNumber)); 
      button.setText("Play Again"); 

      // Matching random number to ArrayList 
      if (positive_IDs.contains(randomNumber)) { 
       // if matched then changes textView2 to Matched Number 
       textView2.setText("Number: " 
         + Integer.toString(randomNumber) + " Matched"); 
       // Toast.makeText(getBaseContext(), "Number:" + 
       // Integer.toString(randomNumber) + " Matched", 
       // Toast.LENGTH_SHORT).show(); 

       totalBalance = totalBalance + winingPrize; 
       textView5.setText("Total Balance = Rs: " 
         + String.format("%.2f", totalBalance)); 

      } 

     } 
    }); 
} 

} 

Answer 1

有，通過它可以實現這一目標的方法數，其中有些是

使用靜態變量或

使用Shared preferences

看到這個link for more options

我會建議你使用共享偏好來存儲數據。

Answer 2

您可以使用共享偏好的方法是這樣的

public class PreferenceData { 

    public static SharedPreferences getSharedPreferences(Context ctx) { 
     return PreferenceManager.getDefaultSharedPreferences(ctx); 
    } 

    public static void setTempString(Context ctx, String str, int str1) { 
     Editor editor = getSharedPreferences(ctx).edit(); 
     editor.putInt(str, str1); 
     editor.commit(); 
    } 

    public static int getTempString(Context ctx, String str) { 
     return getSharedPreferences(ctx).getInt(str, 100); 
    } 

    public static void setString(Context ctx, String str, String str1) { 
     Editor editor = getSharedPreferences(ctx).edit(); 
     editor.putString(str, str1); 
     editor.commit(); 
    } 

在一類和檢索它在你的功能，當你需要這樣的：

int prfdata = PreferenceData.getTempString(context, 
            "downloadcount"); 
          prfdata = prfdata--; 
          PreferenceData.setTempString(context, 
            "downloadcount", prfdata);