另一个类的片段获取方法

Question

我有一个使用片段的 Android 应用。我也在按照教程 (CallLogs Tutorial) 来获取通话记录。

我有一个由链接中的教程制作的类，但现在我想从这个类中获取数据并在我的一个片段中使用它。

我尝试过类似以下的方法；

    int callsMade = new GetUsage().getCallDetails();
    String callsmade = String.valueOf(callsMade);

    Log.e("Calls Made:", "Texts: " + callsmade);

但我一直在“Cursor managedCursor”行收到错误（注意：我已将 managedCursor 更改为 getContentResolver，因为 managedCursor 已被弃用并且也出现错误）

我在这里做错了吗？你能想到我能改变的事情吗？

非常感谢您提供的任何帮助。

编辑： getCallDetails() 的代码；

public int getCallDetails() 
{

    StringBuffer sb = new StringBuffer();
    Cursor callsCursor = getContentResolver().query( CallLog.Calls.CONTENT_URI,null, null,null, CallLog.Calls.DATE + " DESC");
    //Cursor planCursor=PlansHelper.query("plans", null, null, null, null);
    int name = callsCursor.getColumnIndex( CallLog.Calls.CACHED_NAME );
    int number = callsCursor.getColumnIndex( CallLog.Calls.NUMBER ); 
    int type = callsCursor.getColumnIndex( CallLog.Calls.TYPE );
    int date = callsCursor.getColumnIndex( CallLog.Calls.DATE);
    int duration = callsCursor.getColumnIndex( CallLog.Calls.DURATION);
    int allduration = 0;


    sb.append( "Call Details :");
    while ( callsCursor.moveToNext() ) 
    {

        String phName = callsCursor.getString( name );
        String phNumber = callsCursor.getString( number );

        String callType = callsCursor.getString( type );
        int callTypeCode = Integer.parseInt(callType);

        String callDate = callsCursor.getString( date );
        Date formatDate = new Date(Long.valueOf(callDate));
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
        String dateStr = sdf.format(formatDate);

        String userdate = "18/03/2014";

        //Date parseddate = sdf.parse(userdate1);

        Calendar c = Calendar.getInstance();
        try {
            c.setTime(sdf.parse(userdate));
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        c.add(Calendar.DATE, -5);  // number of days to add
        userdate = sdf.format(c.getTime());  // dt is now the new date


        String callDuration = callsCursor.getString(duration);
        float durationToFloat =Float.parseFloat(callDuration);
        float durationToMins = durationToFloat/60;
        int durationRounded = Math.round(durationToMins);
        int callDurationMin = durationRounded;


        if(callTypeCode==CallLog.Calls.OUTGOING_TYPE)
        {

            //if(dateStr.equals(userdate) || dateStr.equals(userdate1))
            if(formatDate.after(c.getTime()))
            {
                sb.append("\nName:--- " + phName + "\nPhone Number:--- " + phNumber + " \nCall Date:--- " + dateStr
                        + " \nCall duration in min :--- " + callDurationMin);
                sb.append("\n----------------------------------");
                allduration = allduration + callDurationMin;
                Log.d(getClass().getSimpleName(), "Done");
            }
        }


    }

    sb.append("##" + allduration + "##");
    getCalls.setText(sb.toString());
    callsCursor.close();

    return allduration;

}

Answer 1

将int callsMade = new GetUsage().getCallDetails();行改为以下代码

 Activity activity = getActivity();
 if(activity instanceof GetUsage)
  {
  GetUsage myactivity = (GetUsage) activity;
  myactivity.getCallDetails();
  }