在我的应用程序中,我使用共享首选项,它在 onResume() 中工作正常,只是它在 onCreate() 中不起作用。有人知道原因吗?在 onCreate 中,共享首选项值始终仅为 null。
这是我的代码
@Override
protected void onResume() {
setTextValues();
super.onResume();
}
private void setTextValues(){
txt1.setText(PreferenceConnector.readString(this,PreferenceConnector.MILEAGE, null));
txt2.setText(PreferenceConnector.readString(this,PreferenceConnector.YEAR, null));
txt3.setText(PreferenceConnector.readString(this,PreferenceConnector.CAPACITY, null));
}
package com.InternetGMBH.Sample.Utilities;
import com.InternetGMBH.Tample.Activities.WheelActivity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class PreferenceConnector{
public static final String PREF_NAME = "PEOPLE_PREFERENCES";
public static final int MODE = Context.MODE_PRIVATE;
public static final String MILEAGE= "MILEAGE";
public static final String YEAR= "YEAR";
public static final String CAPACITY= "CAPACITY";
public static void writeBoolean(Context context, String key, boolean value) {
getEditor(context).putBoolean(key, value).commit();
}
public static boolean readBoolean(Context context, String key, boolean defValue) {
return getPreferences(context).getBoolean(key, defValue);
}
public static void writeInteger(Context context, String key, int value) {
getEditor(context).putInt(key, value).commit();
}
public static int readInteger(Context context, String key, int defValue) {
return getPreferences(context).getInt(key, defValue);
}
public static void writeString(Context context, String key, String value) {
getEditor(context).putString(key, value).commit();
}
public static String readString(Context context, String key, String defValue) {
return getPreferences(context).getString(key, defValue);
}
public static void writeFloat(Context context, String key, float value) {
getEditor(context).putFloat(key, value).commit();
}
public static float readFloat(Context context, String key, float defValue) {
return getPreferences(context).getFloat(key, defValue);
}
public static void writeLong(Context context, String key, long value) {
getEditor(context).putLong(key, value).commit();
}
public static long readLong(Context context, String key, long defValue) {
return getPreferences(context).getLong(key, defValue);
}
public static SharedPreferences getPreferences(Context context) {
return context.getSharedPreferences(PREF_NAME, MODE);
}
public static Editor getEditor(Context context) {
return getPreferences(context).edit();
}
}
如果我在 onCreate() 中调用 setTextValues() 它只显示空值。但 onResume 工作正常。