主要实现自定义图表绘制动画，实现如下效果：
预览gif有点卡。 博客链接：Android自定义控件：动态绘制图表
<com.zyw.horrarndoo.animtestprj.view.HistoryChartView
android:id="@+id/mutiHistoryChartView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
custom:circle_radius="@dimen/history_circle_radius"
custom:data_stroke_width="@dimen/history_data_stroke_width"
custom:first_data_line_color="@color/saswell_indoor_temp"
custom:line_color="@color/saswell_yellow"
custom:line_stroke_width="@dimen/history_line_stroke_width"
custom:margin_bottom="@dimen/history_margin_bottom"
custom:margin_left="@dimen/history_margin_left"
custom:margin_right="@dimen/history_margin_right"
custom:margin_top="@dimen/history_margin_top"
custom:rect_background_color="@color/saswell_power_time"
custom:second_data_line_color="@color/saswell_setpoint_temp"
custom:unit_color="@color/saswell_light_grey"
custom:x_first_point_offset="@dimen/history_x_first_point_offset"
custom:x_unit_text="@string/history_x_unit_day"
custom:x_unit_text_size="@dimen/history_x_unit_text_size"
custom:xlabel_text_size="@dimen/history_xlabel_text_size"
custom:y1_unit_text="@string/history_y1_unit"
custom:y2_unit_text="@string/history_y2_unit"
custom:y_unit_text_size="@dimen/history_y_unit_text_size"
custom:ylabel_text_size="@dimen/history_ylabel_text_size" />