ImageButton-设置background跟src

        <ImageButton
            android:id="@+id/tv3"
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:layout_marginTop="20dp"
            android:src="@drawable/ic_alarm"
            android:background="#ff0000" />

        imagebutton.setBackgroundResource(R.drawable.ic_alarm);
        imagebutton.setImageResource(R.drawable.ic_alarm);