在Bean類調用字符串返回NULL

Question

我有一個bean類，它成功地檢索從另一個類的字符串值。=（它打印出它就好了bean類內）

當我嘗試並調用該類/串它返回爲null。

下面是相關代碼：

public class cityModel implements Serializable { 
    private String fajr; 

    public void setFajr(String fajr) { 
     this.fajr= fajr; 

    } 
    public String getFajr() { 

     return fajr; 
    } 
} 
public void mutePrayerTime(View view) { 
    cityModel cityObj= new cityModel(); 
    String fajr=cityObj.getFajr(); 
    Log.d("LOGCAT", "" + cityObj.getFajr()); 

    //StringBuilder newFajr = new StringBuilder(fajr); 
    //newFajr.delete(2,5); 
    //Log.d("newFajr", String.valueOf(newFajr)); 
    // Intent alarm = new Intent(AlarmClock.ACTION_SET_ALARM); 

    //alarm.putExtra(AlarmClock.EXTRA_HOUR, fajr); 

} 

的Log.d標籤logcat的返回爲空

編輯：

protected void outputTimings(JSONArray jsonArray) { 
     String[] prayers = {"fajr", "shurooq", "dhuhr", "asr", "maghrib", "isha"}; 
     cityModel cityObj; 
     try { 
      cityObj= new cityModel(); 
      for (int i = 0; i < jsonArray.length(); i++) { 
       JSONObject cityObject = 
         jsonArray.getJSONObject(i); 
       result = result + "fajr" + " : " 
         + cityObject.getString("fajr") + "\n" + result + "shurooq" + " : " 
         + cityObject.getString("shurooq") + "\n" + result + "dhuhr" + " : " 
         + cityObject.getString("dhuhr") + "\n" + result + "asr" + " : " 
         + cityObject.getString("asr") + "\n" + result + "maghrib" + " : " 
         + cityObject.getString("maghrib") + "\n" + result + "isha" + " : " 
         + cityObject.getString("isha") + "\n"; 

       cityObj.setFajr(""+cityObject.getString("fajr")); 


      } 

Answer 1

：該bean類從檢索串 代碼看看這個方法：

public void mutePrayerTime(View view) { 
    cityModel cityObj= new cityModel(); 
    String fajr=cityObj.getFajr(); 
    Log.d("LOGCAT", "" + cityObj.getFajr()); 

    //StringBuilder newFajr = new StringBuilder(fajr); 
    //newFajr.delete(2,5); 
    //Log.d("newFajr", String.valueOf(newFajr)); 
    // Intent alarm = new Intent(AlarmClock.ACTION_SET_ALARM); 

    //alarm.putExtra(AlarmClock.EXTRA_HOUR, fajr); 

} 

您剛剛創建了cityObj，就像這個cityModel cityObj= new cityModel();那時它的所有屬性都是null這就是爲什麼你在日誌中看到null的原因。你應該從你outputTimings方法傳遞cityObj到mutePrayerTime方法：

public void mutePrayerTime(View view,cityModel cityObj) { 
    Log.d("LOGCAT", "" + cityObj.getFajr()); 

    //StringBuilder newFajr = new StringBuilder(fajr); 
    //newFajr.delete(2,5); 
    //Log.d("newFajr", String.valueOf(newFajr)); 
    // Intent alarm = new Intent(AlarmClock.ACTION_SET_ALARM); 

    //alarm.putExtra(AlarmClock.EXTRA_HOUR, fajr); 

} 

，然後在outputTimings：

cityObj.setFajr(""+cityObject.getString("fajr")); 
someObj.mutePrayerTime(view, cityObj);