NumberPicker自定義DialogPreference的值永遠不會保存（或永遠不能恢復）

Question

我用兩個NumberPicker（在自定義類MinuteSecondPicker中）定製了DialogPreference。我選擇兩個numberPicker的值，當我再次打開我的DialogPreference時，我的值不會恢復（nerver保存我想） 我試過 在onSetInitialValue方法中defaultValue總是'NULL' 在onDialogClosed中，我嘗試了這些3種方法：persistString（字符串myvalue的），shouldCommit和shouldPersist - >所有返回 'TRUE' ：

public class TimePreference extends DialogPreference { 
private int lastMinute = Constante.DEFAULT_WATER_MINUTE; //10 
private int lastSecond = Constante.DEFAULT_WATER_SECOND; //00 
private MinuteSecondPicker minuteSecondPicker = null; 


public static int getMinute(String time) { 
    String[] pieces=time.split(":"); 

    return(Integer.parseInt(pieces[0])); 
} 

public static int getSecond(String time) { 
    String[] pieces=time.split(":"); 

    return(Integer.parseInt(pieces[1])); 
} 

public TimePreference(Context ctxt, AttributeSet attrs) { 
    super(ctxt, attrs); 

    this.setPositiveButtonText(Constante.BT_VALIDER); 
    this.setNegativeButtonText(Constante.BT_ANNULER); 
} 

@Override 
protected View onCreateDialogView() { 
    minuteSecondPicker = new MinuteSecondPicker(getContext()); 

    return(minuteSecondPicker); 
} 

@Override 
protected void onBindDialogView(View v) { 
    super.onBindDialogView(v); 

    minuteSecondPicker.getMinutePicker().setValue(lastMinute); 
    minuteSecondPicker.getSecondPicker().setValue(lastSecond); 
} 

@Override 
protected void onDialogClosed(boolean positiveResult) { 
    super.onDialogClosed(positiveResult); 

    if (positiveResult) { 

     lastMinute = minuteSecondPicker.getMinutePicker().getValue(); 
     lastSecond = minuteSecondPicker.getSecondPicker().getValue(); 

     String time = String.valueOf(lastMinute)+":"+String.valueOf(lastSecond); 

     //Insertion dans la persistence du téléphone 
     if(callChangeListener(time)){ 
      persistString(time); //Return True 

     } 
    } 
} 

@Override 
protected Object onGetDefaultValue(TypedArray a, int index) { 
    return(a.getString(index)); 
} 

@Override 
protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { 
    String time = null; 
    int test = 0; 
    //recupération des valeurs stockées en persistence du mobile 
    if (restoreValue) { 
     if(defaultValue == null){ 
      time = String.valueOf(Constante.DEFAULT_WATER_MINUTE)+":"+String.valueOf(Constante.DEFAULT_WATER_SECOND); 
     }else{ 
      time = getPersistedString(defaultValue.toString()); 
     } 

    }else{ 
     time = defaultValue.toString(); 
    } 
    lastMinute = getMinute(time); 
    lastSecond = getSecond(time); 

} 

}

我試過很多東西，但沒有工作，只要靠近我的應用程序放鬆我嘗試保存的偏好。

Answer 1

您可以使用以下代碼保存您的偏好。不要忘記在你自定義的Numberpicker中添加android：persistent =「true」。

public class NumberPickerPreference extends DialogPreference{ 


private NumberPicker numberPicker; 
private static int DEFAULT_VALUE = 2; 
private int date; 

public NumberPickerPreference(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
} 

public NumberPickerPreference(Context context, AttributeSet attrs) { 
    super(context, attrs); 
} 
@Override 
protected View onCreateDialogView() { 

    final FrameLayout parent = new FrameLayout(getContext()); 
    parent.addView(generateNumberPicker(), new FrameLayout.LayoutParams(
      FrameLayout.LayoutParams.WRAP_CONTENT, 
      FrameLayout.LayoutParams.WRAP_CONTENT, 
      Gravity.CENTER)); 

    return parent; 
} 

public NumberPicker generateNumberPicker() { 
    numberPicker = new NumberPicker(getContext()); 
    numberPicker.setMinValue(1); 
    numberPicker.setMaxValue(30); 
    numberPicker.setValue(2); 

    /* 
    * Anything else you want to add to this. 
    */ 

    return numberPicker; 
} 

@Override 
protected void onDialogClosed(boolean positiveResult) { 

    if (positiveResult) { 
     persistInt(numberPicker.getValue()); 
    } 
} 

@Override 
protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) { 
    if (restorePersistedValue) { 
     // Restore existing state 
     date = this.getPersistedInt(DEFAULT_VALUE); 
    } else { 
     // Set default state from the XML attribute 
     date = (Integer) defaultValue; 
     persistInt(date); 
    } 
} 

@Override 
protected Object onGetDefaultValue(TypedArray a, int index) { 
    return a.getInteger(index, DEFAULT_VALUE); 
} 

@Override 
public void onClick(DialogInterface dialog, int which) { 
    switch (which){ 
     case BUTTON_POSITIVE: 
      setSummary(String.valueOf(numberPicker.getValue())); 
      //Message.message(mContext,"ok clicked"); 
      break; 

     case BUTTON_NEGATIVE: 
      // Put your logic here for Cancel button press 
      //Message.message(mContext, "cancel clicked"); 
      break; 
    } 
    super.onClick(dialog, which); 
} 

// This code copied from android's settings guide. 

private static class SavedState extends BaseSavedState { 
    // Member that holds the setting's value 
    // Change this data type to match the type saved by your Preference 
    int value; 

    public SavedState(Parcelable superState) { 
     super(superState); 
    } 

    public SavedState(Parcel source) { 
     super(source); 
     // Get the current preference's value 
     value = source.readInt(); // Change this to read the appropriate data type 
    } 

    @Override 
    public void writeToParcel(Parcel dest, int flags) { 
     super.writeToParcel(dest, flags); 
     // Write the preference's value 
     dest.writeInt(value); // Change this to write the appropriate data type 
    } 

    // Standard creator object using an instance of this class 
    public static final Parcelable.Creator<SavedState> CREATOR = 
      new Parcelable.Creator<SavedState>() { 

       public SavedState createFromParcel(Parcel in) { 
        return new SavedState(in); 
       } 

       public SavedState[] newArray(int size) { 
        return new SavedState[size]; 
       } 
      }; 
} 



@Override 
protected Parcelable onSaveInstanceState() { 
    final Parcelable superState = super.onSaveInstanceState(); 
    // Check whether this Preference is persistent (continually saved) 
    if (isPersistent()) { 
     // No need to save instance state since it's persistent, use superclass state 
     return superState; 
    } 

    // Create instance of custom BaseSavedState 
    final SavedState myState = new SavedState(superState); 
    // Set the state's value with the class member that holds current setting value 
    myState.value = date; 
    return myState; 
} 

@Override 
protected void onRestoreInstanceState(Parcelable state) { 
    // Check whether we saved the state in onSaveInstanceState 
    if (state == null || !state.getClass().equals(SavedState.class)) { 
     // Didn't save the state, so call superclass 
     super.onRestoreInstanceState(state); 
     return; 
    } 

    // Cast state to custom BaseSavedState and pass to superclass 
    SavedState myState = (SavedState) state; 
    super.onRestoreInstanceState(myState.getSuperState()); 

    // Set this Preference's widget to reflect the restored state 
    numberPicker.setValue(myState.value); 
}