由网友(逆流)分享简介：我开始学习Android和我有几个问题。我有我的主要程序为：I am starting to learn android and i have a few questions.I have my main program as:public class Radiation_overflowActivity e...

我开始学习Android和我有几个问题。 我有我的主要程序为：

I am starting to learn android and i have a few questions. I have my main program as:

public class Radiation_overflowActivity  extends Activity implements OnClickListener {

    EditText init_cores;
        View final_cores;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    //Set up click listeners
    init_cores=(EditText) findViewById(R.id.init_cores);
    //init_cores.setOnClickListener(this);
    final_cores=(View) findViewById(R.id.final_cores);
    final_cores.setOnClickListener(this);

     }

    //called when a button is clicked
    public void onClick(View v) {

        switch (v.getId()){

        case R.id.final_cores:
            //int r = Integer.parseInt(init_cores.getText().toString().trim());
            double initcores=Double.parseDouble(init_cores.getText().toString().trim());
            double l=2,t=2;
            double fcores=initcores*Math.exp(-l*t);
            Intent i=new Intent(this,calcs.class);
            i.putExtra("value",fcores);
            startActivity(i);
            break;
         }

       }
      }

另外，我的main.xml：

Also, my main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/initial_cores" />
<EditText
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/init_cores"
    android:inputType="numberDecimal" />
<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/final_cores"
    android:text="@string/calculate" />
</LinearLayout>

我的calcs.java：

My calcs.java:

public class calcs extends Activity{

    TextView calcs_final;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.calcs);

        calcs_final=(TextView) findViewById(R.id.calcs_final);

        double f=getIntent().getExtras().getDouble("value");

        calcs_final.setText(Double.toString(f));


}

}

我的calcs.xml：

My calcs.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/calcs_final" 
        android:text="@string/result" />


</LinearLayout>

我想这样做：

I want to do this:

用户输入数据到的EditText（init_cores），然后我希望做一些计算来计算final_cores并显示给用户。

The user enters data into the edittext (init_cores) and then i want to make some calculations to compute the final_cores and show it to the user.

我有显示results.I我开始另一个活动（calcs.class和calcs.xml）的麻烦。 当我必须这样做计算？到calcs.class？ 现在，用户输入一个号码，presses计算按钮，然后它显示的文本（从strings.xml中）核心数，但不是结果

I have trouble for showing the results.I am starting another activity (calcs.class and calcs.xml). Where i must do the calculations?To the calcs.class? Right now,the user enters a number ,presses the "Calculate" button and then it shows the text (from the strings.xml) "Number of cores"" ,but not the result.

另外，我可以使用输入的数据，并从我的计算，使一个阴谋吗？如果你能给我一些这方面的方向。

Also, can i use the input from the data and from my calculations and make a plot?If you could give me some directions to this.

最后，就是我的做法对吗？

Finally,is my approach right?

感谢您！

推荐答案

根据我觉得你的 final_cores 是，你想要得到你的EditText的价值观点计算（希望我没看错）

As per I think your final_cores is a view on which, you want to get your edittext's value for calculation(Hope I am not wrong)

于是，在做这样的事情，

So, just do Something like,

public void OnClick(View v) {

    switch (v.getId()){

    case R.id.final_cores:
        int r = Integer.parseInt(init_cores.getText().toString().trim());
        Intent i=new Intent(this,calcs.class);
        i.putExtra("value",r);
        startActivity(i);
        break;
    }

}

从 init_cores 的EditText删除 onClickListener 。并获得研究值的 Calcs.class 用

Remove onClickListener from your init_cores edittext. And get values of r in your Calcs.class using

int r = getIntent().getExtras().getInt("value");

另外，请务必在总您输入数值的编辑文本，以便它可以是可解析为整数。

Also be sure in your edit text always you are entering numeric values so it can be parsable into Integer..

试试这个，让我知道发生什么事。

Try this and let me know what happen..

谢谢