共享偏好項目存儲

Question

我重新發布這個問題，因爲我仍然堅持這一點。

所以我正在創建一個簡單的android應用程序。我有一個菜單項，其中有3個複選框。只要我的應用程序啓動，用戶可以從給定的複選框中選擇一個或多個。但是，我想保存用戶選擇以供進一步參考。我使用共享首選項爲其中的一個複選框實現了這一目標，但如果選中多個複選框，則無法實現此目的。這是我的代碼：

public class MainActivity extends AppCompatActivity { 
    static Switch swch; 
    public static boolean red = false; 
    public static boolean blue = false; 
    public static boolean green = false; 

    private static final String TAG = "MainActivity"; 

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

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main_menu, menu); 
     SharedPreferences settings = getSharedPreferences("settings", 0); 
     boolean isChecked = settings.getBoolean("checkbox", false); 

     MenuItem item = menu.findItem(R.id.red); 
//  MenuItem item1 = menu.findItem(R.id.blue); 
//  MenuItem item2 = menu.findItem(R.id.green); 
     item.setChecked(isChecked); 
//  item1.setChecked(isChecked); 
//  item2.setChecked(isChecked); 
     //return super.onCreateOptionsMenu(menu); 
     return true; 
    } 


    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     SharedPreferences settings = getSharedPreferences("settings", 0); 
     SharedPreferences.Editor editor = settings.edit(); 
     switch (item.getItemId()) { 
      case R.id.red: 
       item.setChecked(!item.isChecked()); 

       editor.putBoolean("checkbox", item.isChecked()); 
       editor.commit(); 
       return true; 
      case R.id.blue: 
       item.setChecked(!item.isChecked()); 

       editor.putBoolean("checkbox", item.isChecked()); 
       editor.commit(); 
       return true; 
      case R.id.green: 
       item.setChecked(!item.isChecked()); 

       editor.putBoolean("checkbox", item.isChecked()); 
       editor.commit(); 
       return true; 

      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 

如何使用共享首選項來實現所有開關箱選項？

謝謝。

Answer 1

更新您的兩種方法 - onCreateOptionsMenu和onOptionsItemSelected，如下所示。

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 

     getMenuInflater().inflate(R.menu.main_menu, menu); 
     SharedPreferences settings = getSharedPreferences("settings", 0); 
     boolean red = settings.getBoolean("red", false); 
     boolean blue = settings.getBoolean("blue", false); 
     boolean green = settings.getBoolean("green", false); 

     MenuItem item = menu.findItem(R.id.color1); 
     MenuItem item1 = menu.findItem(R.id.color2); 
     MenuItem item2 = menu.findItem(R.id.color3); 
     item.setChecked(red); 
     item1.setChecked(blue); 
     item2.setChecked(green); 
     //return super.onCreateOptionsMenu(menu); 
     return true; 
    } 


    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     SharedPreferences settings = getSharedPreferences("settings", 0); 
     SharedPreferences.Editor editor = settings.edit(); 
     switch (item.getItemId()) { 
      case R.id.color1: 
       item.setChecked(!item.isChecked()); 


       editor.putBoolean("1", item.isChecked()); 
       editor.commit(); 
       return true; 
      case R.id.color2: 
       item.setChecked(!item.isChecked()); 

       editor.putBoolean("2", item.isChecked()); 
       editor.commit(); 
       return true; 
      case R.id.color3: 
       item.setChecked(!item.isChecked()); 

       editor.putBoolean("3", item.isChecked()); 
       editor.commit(); 
       return true; 
      case R.id.item_accessibility_services: 
       startActivity(new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS)); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    }