保存多個Seekbar的sharedpreferences

Question

我有一個活動，其中y有3個seekbar，我看到每個seekbar的textview上的每個seekbar的值。

現在，我想用sharedPreferences存儲每個seekbar的值。我嘗試過幾種方式，但我無法得到它。

我已經意識到，相應的方法是在調用onPause時保存值，並在調用onResume時恢復它們。

public class Configuration extends Activity implements OnSeekBarChangeListener { 

    public TextView progress1; 
    public TextView progress2; 
    public TextView progress3; 
    private SeekBar bar1; 
    private SeekBar bar2; 
    private SeekBar bar3; 

    private int savedProgress1; 
    private int savedProgress2; 
    private int savedProgress3; 
    private int loadedProgress1; 
    private int loadedProgress2; 
    private int loadedProgress3; 
    private String Key_PROGRESS_1 = "bar1_progress"; 
    private String Key_PROGRESS_2 = "bar2_progress"; 
    private String Key_PROGRESS_3 = "bar3_progress"; 

    SharedPreferences mPreferences; 
    SharedPreferences.Editor editor; 



    /********************* 
    * 
    * ONCREATE 
    * 
    ********************/ 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.configuracion2); 



     bar1 = (SeekBar)findViewById(R.id.fast_bar); //make seekbar object 
     bar1.setOnSeekBarChangeListener(this); //set seekbar listener 
     progress1 = (TextView)findViewById(R.id.salida1); 

     bar2 = (SeekBar)findViewById(R.id.climb_bar); 
     bar2.setOnSeekBarChangeListener(this);  
     progress2 = (TextView)findViewById(R.id.salida2); 

     bar3 = (SeekBar)findViewById(R.id.platform_bar); 
     bar3.setOnSeekBarChangeListener(this);  
     progress3 = (TextView)findViewById(R.id.salida3); 


     mPreferences = PreferenceManager.getDefaultSharedPreferences(this); 
     editor = mPreferences.edit(); 



    } 


    public void onProgressChanged(SeekBar bar, int progress, boolean fromUser) { 
     Log.v("", "" + bar); 
     switch (bar.getId()) { 
      case R.id.fast_bar: 
       progress1.setText(progress + "%"); 
       break; 
      case R.id.climb_bar: 
       progress2.setText(progress + "%"); 
       break; 
      case R.id.platform_bar: 
       progress3.setText(progress + "%"); 
       break; 
     } 
    } 

    @Override 
    public void onStartTrackingTouch(SeekBar seekBar) {  
    } 
    @Override 
    public void onStopTrackingTouch(SeekBar seekBar) { 
     seekBar.setSecondaryProgress(seekBar.getProgress());  
    } 




    protected void onResume() {  
     super.onResume(); 

      loadedProgress1 = mPreferences.getInt("Key_PROGRESS_1", 0); 
      bar1.setProgress(loadedProgress1);   

      loadedProgress2 = mPreferences.getInt("Key_PROGRESS_2", 0); 
      bar2.setProgress(loadedProgress2); 

      loadedProgress2 = mPreferences.getInt("Key_PROGRESS_3", 0); 
      bar3.setProgress(loadedProgress3); 

    } 




    protected void onPause(/*SeekBar seekBar*/) { 
     super.onPause(); 

       savedProgress1 = bar1.getProgress(); 
       editor.putInt(Key_PROGRESS_1, savedProgress1); 
       savedProgress2 = bar2.getProgress(); 
       editor.putInt(Key_PROGRESS_2, savedProgress2); 
       savedProgress3 = bar3.getProgress(); 
       editor.putInt(Key_PROGRESS_3, savedProgress3); 
       editor.commit(); 


    } 

} 

Answer 1

不要保持相同的SharedPreferences.Editor對象作爲私人成員。

呼叫mPreferences.edit()內onPause()：

SharedPreferences.Editor editor = mPreferences.edit(); 
savedProgress1 = bar1.getProgress(); 
editor.putInt(Key_PROGRESS_1, savedProgress1); 
savedProgress2 = bar2.getProgress(); 
editor.putInt(Key_PROGRESS_2, savedProgress2); 
savedProgress3 = bar3.getProgress(); 
editor.putInt(Key_PROGRESS_3, savedProgress3); 
editor.commit(); 

---

此外，它可以因爲你使用字符串"Key_PROGRESS_X"不是變量Key_PROGRESS_X的，在你的onResume()方法不起作用。