机器人 - 如何使用用户数据图 [英] android - how to make plot with user data
问题描述
我有一个计划，使根据用户数据的一些计算。
该程序工作正常，但是当我尝试为了使情节使用achartengine，它崩溃。（不会做图）
I have a program which makes some calculations according to user data. The program works fine ,but when i try to use achartengine in order to make the plot ,it crashes.(doesn't do the plot)
我不知道我是否正确传递中的数据线图类。
I am not sure if i am passing right the data in the LineGraph class.
据我了解，我必须用
包某事= getIntent.getExtras（）
但我不知道在哪里把它放在线图。
"Bundle sth=getIntent.getExtras()" but i am not sure where to put it in LineGraph.
我有在其中用户输入的数据，然后presses计算按钮，而在另一个活动显示结果的number_cores类。
在这方面，我有：
I have the number_cores class which in which the user enters the data and then presses the calculate button and in another activity shows the result. In this , i have :
public void cores_func(){
double initcores=Double.parseDouble(num_cores.getText().toString().trim());
double half_time=Double.parseDouble(halftimecores.getText().toString().trim());
double ttime=Double.parseDouble(timecores.getText().toString().trim());
double l=Math.log(2)/half_time;
double fcores=initcores*Math.exp(-l*ttime);
Intent i=new Intent(this,core_calcs.class);
i.putExtra("value",fcores);
i.putExtra("value2",initcores);
startActivity(i);
}
然后，在core_calcs类（你可以从上面的意图看），我显示的结果，也是我加入，当用户单击此按钮，显示了图（现在，它崩溃这里）。
Then , in the core_calcs class (as you can see from the intent above) , i show the result and also i added a button which when the user clicks it ,shows the graph (right now ,it crashes here).
我在onCreate方法（core_calcs）：
I have (core_calcs) in the onCreate method :
double fcores=getIntent().getExtras().getDouble("value");
double initcores=getIntent().getExtras().getDouble("value2");
和则：
public void onClick(View v) {
switch (v.getId()){
case R.id.show_cores_graph:
double fcores=getIntent().getExtras().getDouble("value");
double initcores=getIntent().getExtras().getDouble("value2");
Intent i = new Intent();
i.setClassName("com.wordpress.androiddevgeo.Radiation",LineGraph.class.getName());
i.putExtra("value", fcores);
i.putExtra("value2", initcores);
this.startActivity(i);
break;
}
}
（另外，我有公共无效LineGraphHandler（查看视图）这里）
(also, i have the public void LineGraphHandler (View view) here)
最后，在线图的类（上述的意图）：
Finally , in the LineGraph class (the intent above):
public class LineGraph extends Activity {
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Bundle extras=getIntent().getExtras();
String fcores=extras.getString("value");
String initcores=extras.getString("value2");
}
public Intent getIntent(Context context){
//double ttime=getIntent(context).getExtras().getDouble("value");
double [] x = {0,100}; //time axis
double [] y = {initcores,fcores}; //number of cores axis
TimeSeries series = new TimeSeries("Number of cores");
for (int i=0;i<x.length;i++){
series.add(x[i],y[i]);
}
XYMultipleSeriesDataset dataset=new XYMultipleSeriesDataset();
dataset.addSeries(series);
XYMultipleSeriesRenderer mRenderer =new XYMultipleSeriesRenderer();
XYSeriesRenderer renderer =new XYSeriesRenderer();
mRenderer.addSeriesRenderer(renderer);
Intent intent=ChartFactory.getLineChartIntent(context, dataset, mRenderer,"Decay");
return intent;
}
}
如何将数据（initcores和fcores）传递到线图？
How to pass the data (initcores and fcores ) to the LineGraph?
--------错误消息------------------------------------- --------
--------Error messages ---------------------------------------------
W / dalvikvm（734）：主题ID = 3：螺纹未捕获的异常退出
W/dalvikvm(734): threadid=3: thread exiting with uncaught exception
（组= 0x4000fe70）01-15 18：42：01.334：E / AndroidRuntime（734）：未捕获
处理：螺纹主力退出，由于未捕获的异常
(group=0x4000fe70) 01-15 18:42:01.334: E/AndroidRuntime(734): Uncaught handler: thread main exiting due to uncaught exception
E / AndroidRuntime（734）：android.content.ActivityNotFoundException：无法找到明确的活动类
E/AndroidRuntime(734): android.content.ActivityNotFoundException: Unable to find explicit activity class
有你在你的AndroidManifest.xml宣布这项活动？
have you declared this activity in your AndroidManifest.xml?
（我已宣布了线图，也有org.achartengine.GraphicalActivity活动）
谢谢！
(I have declared the activity for the LineGraph and also "org.achartengine.GraphicalActivity") Thanks!
推荐答案
捆绑的方式：
Intent searchIntent = new Intent();
searchIntent.setClassName("com.mypackage",searrchActivity.class.getName());
searchIntent.putExtra("value", initcores); // key/value pair, where key needs current package prefix.
searchIntent.putExtra("value2", fcores);
thisactivity.startActivity(searchIntent);
和你的线图的活动：
class LineGraph extends Activity{
private Double initcores;
private Double fcores;
public Double getInitcores(){ return this.initcores;}
public void setInitcores(Double initcores){ this.initcores=initcores;}
public Double getFcores(){ return this.fcores;}
public void setFcores(Double fcores){ this.fcores=fcores;}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
......
Bundle extras = getIntent().getExtras();
Double initcores= extras.getDouble("value");
setInitcores(initcores);
Double fcores= extras.getDouble("value2"));
setFcores(fcores);
}
public Intent getIntent(...){
Double initcores= getInitcores();
Double fcores= getFcores();
//yourcode
}
}
共享preferences方式：
SharedPreferences approach:
SharedPreferences sp =PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor ed= sp.edit();
ed.putInt("screen_width", 480);
ed.commit();
在你的下一个活动。
and in your next activity
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
int width = sp.getInt("screen_width",default_int_value);
希望这有助于升技
hope this helps abit
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