textTem = (TextView) findViewById(R.id.textTem);
    textTem.setText("ssss");

public class DayItem extends RelativeLayout {
            ...
        }

<com.example.a28210.weathpredict.DayItem
            android:id="@+id/days1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            item:dayweather="snow"
            item:daymaxtem="-2°"
            item:daymintem="-12°"
            item:daydate="12.8" />

<?xml version="1.0" encoding="utf-8"?>
            <resources>
                <declare-styleable name="DayItem">
                    <attr name="daydate" format="string" />
                    <attr name="dayweather" format="string" />
                    <attr name="daymaxtem" format="string" />
                    <attr name="daymintem" format="string" />
                </declare-styleable>
            </resources>

DayItem d=(DayItem)view.findViewById(R.id.days1);
                    d.     //?????