如何在for循环中自动增加变量名?

API Level: 12 (Android 3.1)

API级别:12 (Android 3.1)

App Background: Through my Android app I am sending a request to our web servers MySQL database to retrieve companies. All of that works fine. Originally I had the returned data populate a ListView, but to get the visual my boss prefers I have 6 TextView's evenly distributed. (This app is designed to only work on ONE device, the Samsung Galaxy Tab 10.1)

应用背景:通过我的Android应用程序，我向我们的web服务器MySQL数据库发送请求，以检索公司。所有这些都很有效。最初，我有返回的数据填充ListView，但是为了得到我的老板更喜欢的视觉，我有6个TextView的均匀分布。(这款应用只适用于三星Galaxy Tab 10.1)

Question: So, in parsing the returned data I have a for loop. What I would like to do, is auto increment a variable i.e. company_ + i then i++. Is this possible in Java or is there a better way?

问题:因此，在解析返回的数据时，我有一个for循环。我想做的是，自动递增一个变量，例如company_ + I然后I ++。这在Java中是可能的还是有更好的方法?

Here is an example of how I would think it would work:

这里有一个我认为它将如何工作的例子:

int length = 5;

//parse JSON data
try{
    JSONArray jArray = new JSONArray(result);
    for(int i=0; i < length; i++){

        TextView company = (TextView)findViewById(R.id.company_ + i);

        JSONObject jObject = jArray.getJSONObject(i);
            String businessName = jObject.getString("businessName");
            double distance = jObject.getDouble("distance");

            double distRound = 1e5;
            double roDistance = Math.round(distance * distRound) / distRound;

            company.setText(businessName);
            company.append(Html.fromHtml("<br>"));
            company.append("Approximate distance:   " + roDistance + " feet.");

Error Thrown: The operator + is undefined for the argument type(s) TextView, int. Which makes sense, however I am used to working in PHP where I do this often.

抛出错误:操作符+未定义为参数类型TextView (s) int.这是有意义的，但是我习惯在PHP中工作，我经常这样做。

Here is my layout:

这是我的布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/location_select"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/row_2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="2" >

        <TextView
            android:id="@+id/company_1"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="top|left"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />

        <TextView
            android:id="@+id/company_2"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="top|right"
            android:layout_marginTop="0dp"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/row_3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="2"
        android:layout_below="@id/row_2" >

        <TextView
            android:id="@+id/company_3"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="bottom|left"
            android:layout_marginLeft="0dp"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />

        <TextView
            android:id="@+id/company_4"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="bottom|right"
            android:layout_marginRight="0dp"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/row_4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="2"
        android:layout_below="@id/row_3" >

        <TextView
            android:id="@+id/company_5"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="bottom|left"
            android:layout_marginLeft="0dp"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />

        <TextView
            android:id="@+id/next_5"
            android:layout_width="0dp"
            android:layout_height="200dp"
            android:layout_gravity="bottom|right"
            android:layout_marginRight="0dp"
            android:layout_weight="1"
            android:textIsSelectable="true"
            android:textSize="25sp" />
    </LinearLayout>

</RelativeLayout>

4 个解决方案

#1

If Textview remains constant, then you can do this..

如果Textview保持不变，那么可以这样做。

int[] companyIds = { R.id.company_id_1,
        R.id.company_id_2, R.id.company_id_3,...};

and in code do this

在代码中做这个

TextView company_select = (TextView)findViewById(companyIds[i]);

#2

The way you are doing is not possible.

你这样做是不可能的。

You could use Reflection but that would be overkill. Try the following

你可以使用反射，但那是多余的。试试以下

List<Integer> companies= Arrays.asList(R.id.company_1,R.id.company_2,R.id.company_3,R.id.company_4,R.id.company_5);

And get it with:

并得到:

companies.get(i%5);

#3

Are you really sure about this line,

你真的确定这条线，

TextView company_select = company_ + i;

?? That line throws the error (Exception).

? ?这行抛出错误(异常)。

What's the meaning of that line, What you want to achieve?

这句话的意思是什么，你想要实现什么?

Just store your textview's id in int array..

只需将textview的id存储在int数组中。

int[] textviewIds = { R.id.company_id_1,
        R.id.company_id_2, R.id.company_id_3,R.id.company_id_4,R.id.company_id_5...};

and use this array in your for loop,

在for循环中使用这个数组，

TextView company_select = (TextView)findViewById(textviewIds[i]);

#4

You can use Integer.toString()
Then the call will be TextView company_select = company_ + Integer.toString(i);

可以使用Integer.toString()然后调用TextView company_select = company_ + Integer.toString(i);

#1