我用androidplot从我的数据库制作了一个图表，但是当我用按钮重置数据库时，图表dosnt更新，我如何在不重新创建活动的情况下更新图表？
public class Overview extends Activity {
Number[] seriesOfNumbers;
private XYPlot mySimpleXYPlot;
// double totalprofitd;
private BetsDbAdapter dbHelper;
TextView NBtext;
TextView TOtext;
TextView TPtext;
TextView ROItext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.c_overview);
dbHelper = new BetsDbAdapter(this);
TOtext = (TextView) findViewById(R.id.turnover);
TPtext = (TextView) findViewById(R.id.totalprofit);
NBtext = (TextView) findViewById(R.id.numberOfBet);
ROItext = (TextView) findViewById(R.id.roi);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.android_tab_layout, menu);
return true;
}
public void resetClick(View v) {
dbHelper.open();
dbHelper.deleteDatabase();
dbHelper.close();
CalculateProfit();
graph();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
CalculateProfit();
graph();
}
public void CalculateProfit() {
dbHelper.open();
List<String> tip = dbHelper.getTip();
List<String> betamount = dbHelper.getBetAmount();
ArrayList<String> sbodds = dbHelper.getSBodds();
dbHelper.close();
int NumberOfBets = tip.size();
double turnover = 0;
double ROI = 0;
double totalprofit = 0;
double profit = 0;
seriesOfNumbers = new Number[NumberOfBets];
for (int i = 0; i < NumberOfBets; i++) {
String WLV = tip.get(i);
String arrpct[] = WLV.split(" ", 2);
String WLV1 = arrpct[0];
if (WLV1.equals("W")) {
profit = Double.parseDouble(betamount.get(i).replaceAll(",",
"."))
* (Double.parseDouble(sbodds.get(i)) - 1);
}
else if (WLV1.equals("L")) {
profit = -Double.parseDouble(betamount.get(i).replaceAll(",",
"."));
} else {
profit = 0;
}
//Add total turnover
turnover += Double.parseDouble(betamount.get(i).replaceAll(",", "."));
//Add total profit
totalprofit += profit;
//For the graph
seriesOfNumbers[i] = totalprofit;
}
ROI = ((turnover + totalprofit) / turnover) * 100;
TPtext.setText(new DecimalFormat("##.##").format(totalprofit));
TOtext.setText(new DecimalFormat("##.##").format(turnover));
NBtext.setText(Integer.toString(NumberOfBets));
ROItext.setText(new DecimalFormat("##.##").format(ROI));
}
public void graph() {
dbHelper.open();
// initialize our XYPlot reference:
mySimpleXYPlot = (XYPlot) findViewById(R.id.mySimpleXYPlot);
// Turn the above arrays into XYSeries':
XYSeries series1 = new SimpleXYSeries(Arrays.asList(seriesOfNumbers),
// SimpleXYSeries takes a List so turn our array into a list
SimpleXYSeries.ArrayFormat.Y_VALS_ONLY,
// Y_VALS_ONLY means use the element index as the x value
"Series1"); // Set the display title of the series
// Create a formatter to use for drawing a series using
// LineAndPointRenderer:
LineAndPointFormatter series1Format = new LineAndPointFormatter(
Color.rgb(0, 200, 0), // line color
null, // point color
Color.rgb(0, 200, 0)); // fill color (none)
// add a new series' to the xyplot:
mySimpleXYPlot.addSeries(series1, series1Format);
// reduce the number of range labels
mySimpleXYPlot.setTicksPerRangeLabel(3);
// by default, AndroidPlot displays developer guides to aid in laying
// out your plot.
// To get rid of them call disableAllMarkup():
mySimpleXYPlot.disableAllMarkup();
dbHelper.close();
}
}
不知道它是否重要，但这是我的：
c_overview.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/Profit_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="6"
android:text="Profit:" />
<TextView
android:id="@+id/ROI_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="6"
android:text="ROI:" />
<TextView
android:id="@+id/Bet_Counter_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="6"
android:text="No. of Bets:" />
<TextView
android:id="@+id/Turnover_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="6"
android:text="Turnover:" />
</LinearLayout>
<LinearLayout
android:layout_width="130dp"
android:layout_height="wrap_content"
android:layout_weight="0.75"
android:orientation="vertical" >
<TextView
android:id="@+id/totalprofit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:text="total profit" />
<TextView
android:id="@+id/roi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:text="Return Of Interest" />
<TextView
android:id="@+id/numberOfBet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="number of bets" />
<TextView
android:id="@+id/turnover"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:text="Turnover" />
</LinearLayout>
<Button
android:id="@+id/reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="resetClick"
android:text="Reset" />
</LinearLayout>
<com.androidplot.xy.XYPlot
android:id="@+id/mySimpleXYPlot"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="10px"
android:layout_marginLeft="10px"
android:layout_marginRight="10px"
title="A Simple XYPlot Example"/>
</LinearLayout>