如何在两个点之间填充阵列从另一个活动数据 [英] how to fill array between two points with data from another activity
问题描述
-------已更新-------------------------------------
在这个类我做了算了一笔账:
...
ArrayList的<双> final_cores =新的ArrayList<双>();
...
公共无效cores_func(){
双initcores = Double.parseDouble(。num_cores.getText()的toString()修剪());
双half_time = Double.parseDouble(。halftimecores.getText()的toString()修剪());
双TTIME = Double.parseDouble(timecores.getText()的toString()修剪());
双L =将Math.log(2)/ half_time;
双fcores = initcores * Math.exp(-l * TTIME);
的for(int i = 0; I< = TTIME;我++){
final_cores.add(initcores * Math.exp(-l * TTIME));
} //转换ArrayList的加倍[] 双[] = MYDATA新的双[final_cores.size()];
的for(int i = 0; I< final_cores.size();我++){
MYDATA [I] = final_cores.get(ⅰ);
}
意图I =新意图(这一点,core_calcs.class);
i.putExtra(价值,fcores);
i.putExtra(值2,initcores);
i.putExtra(值3,TTIME);
i.putExtra(final_cores,MYDATA);
startActivity(ⅰ);
}
...
和在线图类:
...
私人双[] = final_cores新的双[100];
市民双[] getFinal_cores(){返回this.mydata;}
公共无效setFinal_cores(双[] final_cores){this.mydata = MYDATA;}
公共无效的onCreate(捆绑savedInstanceState){ super.onCreate(savedInstanceState); 捆绑额外= getIntent()getExtras()。
...
双[] = MYDATA extras.getDoubleArray(final_cores);
setFinal_cores(MYDATA);公共意向getIntent(上下文的背景下){
...
双[] = MYDATA getFinal_cores();ArrayList的<双> X =新的ArrayList<双>();
ArrayList的<双> Y =新的ArrayList<双>();
// ArrayList的<双>数据=新的ArrayList<双>(); //填写的x,y值
的for(int i = 0; I< = 10;我++){
x.add(TTIME / 10.0 * I);
} 的for(int i = 0; I< = 10;我++){
y.add(initcores +((MYDATA [I])/ 10.0 * I)); }
TimeSeries的系列=新的TimeSeries(衰减);
的for(int i = 0; I< x.size();我++){
series.add(x.get(ⅰ),y.get(ⅰ));
}
1),不幸的是,你把它似乎并不存在通过双重的ArrayList的简单方法。有两种方法可以解决这个:
a)你需要创建一个围绕双(注意包装类:原始而不是类),并扩展了Parcelable(指南是在这里:的 http://developer.android.com/reference/android/os/Parcelable.html )。如果这个类被称为NewDouble,您可以使用下面的code:
的ArrayList< NewDouble> final_cores =(ArrayList的&所述; NewDouble&GT)extras.getParcelableArrayList(final_cores);
b)如果您ArrayList中转换为双[]把它放在包之前,你可以使用getDoubleArray()为双阵列。
快速code到一个ArrayList转换为双数组:
双击[] =的doubleArray新的双[final_cores.size()];
的for(int i = 0; I< final_cores.size();我++){
的doubleArray [I] = final_cores.get(ⅰ);
}
-------UPDATED-------------------------------------
In this class i do the calculations:
...
ArrayList<Double> final_cores =new ArrayList<Double>();
...
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);
for (int i=0;i<=ttime;i++){
final_cores.add(initcores*Math.exp(-l*ttime));
}
//convert ArrayList to double[]
double[] mydata = new double[final_cores.size()];
for(int i = 0; i < final_cores.size(); i++) {
mydata[i] = final_cores.get(i);
}
Intent i=new Intent(this,core_calcs.class);
i.putExtra("value",fcores);
i.putExtra("value2",initcores);
i.putExtra("value3",ttime);
i.putExtra("final_cores",mydata);
startActivity(i);
}
...
and in the linegraph class :
...
private double [] final_cores =new double [100];
public double [] getFinal_cores(){ return this.mydata;}
public void setFinal_cores( double [] final_cores){ this.mydata=mydata;}
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Bundle extras=getIntent().getExtras();
...
double [] mydata = extras.getDoubleArray("final_cores");
setFinal_cores(mydata);
public Intent getIntent(Context context){
...
double []mydata=getFinal_cores();
ArrayList<Double> x =new ArrayList<Double>();
ArrayList<Double> y =new ArrayList<Double>();
// ArrayList<Double> data =new ArrayList<Double>();
//fill x,y values
for (int i=0;i<=10;i++){
x.add(ttime / 10.0 * i);
}
for (int i=0;i<=10;i++){
y.add(initcores + ((mydata[i]) / 10.0 * i));
}
TimeSeries series = new TimeSeries("Decay");
for (int i=0;i<x.size();i++){
series.add(x.get(i),y.get(i));
}
1) Unfortunately for you it does not seem that there is an easy way to pass double ArrayLists. There are two ways you can approach this:
a) You need to create a class that wraps around a double (note: the primitive not the class) and extends Parcelable (guide is here: http://developer.android.com/reference/android/os/Parcelable.html). If this class is called NewDouble, you can use the code below:
ArrayList<NewDouble> final_cores = (ArrayList<NewDouble>)extras.getParcelableArrayList("final_cores");
b) If you convert the ArrayList to a double[] before putting it in the bundle, you can use getDoubleArray() to a double array.
Quick code to convert an ArrayList to a double array:
double[] doubleArray = new double[final_cores.size()];
for(int i = 0; i < final_cores.size(); i++) {
doubleArray[i] = final_cores.get(i);
}
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