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    如何从出toinside主要方法主要方法打印值方法、toinside

    2023-09-04 07:34:52 作者：张狂的°青春╮

    如何访问值超出主类的？我想打印elementarytxtview价值 在主类的参数，但在参数我想在参数传递elementarytextview价值的其他活动打印空值

     公共类HomeMenu延伸活动​​{
的ImageButton imgNews，imgContact，imgSetting;
ListView控件listMainMenu;
ListView的Middleschoollist，HighSchoollist，Atipicalschoollist;
字符串状态;
firstscreenadapter MMA;
字符串SelectMenuAPI;
字符串SelectMenuAPI2;
字符串URL1;
字符串初等;

//串高;
字符串消息;
TextView的Elementarytxt，Middletxt，Hightxt，Atypicaltxt;
静态的ArrayList＆LT;龙＆GT; CATEGORY_ID =新的ArrayList＆LT;龙＆GT;（）;
静态的ArrayList＆LT;字符串＆GT; CATEGORY_NAME =新的ArrayList＆LT;字符串＆GT;（）;
字符串elementarytxtview;

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.firstscreenfinal）;

    ExpandableHeightListView listMainMenu =（ExpandableHeightListView）
   findViewById（R.id.listMainMenu11）;
    ExpandableHeightListView Middleschoollist =（ExpandableHeightListView）
    findViewById（R.id.listMainMenu22）;
    ExpandableHeightListView HighSchoollist =（ExpandableHeightListView）
   findViewById（R.id.listMainMenu33）;
    ExpandableHeightListView Atipicalschoollist =（ExpandableHeightListView）
         findViewById（R.id.listMainMenu44）;

    Elementarytxt =（TextView中）findViewById（R.id.Elementaryschool）;
    Middletxt =（TextView中）findViewById（R.id.MiddleSchool）;
    Hightxt =（TextView中）findViewById（R.id.HighSchool）;
    Atypicaltxt =（TextView中）findViewById（R.id.AtipicalSchool）;

    MMA =新firstscreenadapter（本）;

    如果（！Utils.isNetworkAvailable（HomeMenu.this））{
        Toast.makeText（HomeMenu.this，无网络可用，
                Toast.LENGTH_SHORT）.show（）;
    }

    如果（！Utils.isUserOnline（本））{
        Toast.makeText（这一点，无网络，Toast.LENGTH_LONG）.show（）;
    }

    为url1 =htt​​p://198.57.208.46/~school/ajax.php?action=get_school;


    listMainMenu.setAdapter（MMA）;
    Middleschoollist.setAdapter（MMA）;
    HighSchoollist.setAdapter（MMA）;
    Atipicalschoollist.setAdapter（MMA）;


    listMainMenu.setExpanded（真正的）;
    Middleschoollist.setExpanded（真正的）;
    HighSchoollist.setExpanded（真正的）;
    Atipicalschoollist.setExpanded（真正的）;
    Toast.makeText（这一点，elementarytxtview，Toast.LENGTH_SHORT）.show（）;
    listMainMenu.setOnItemClickListener（新OnItemClickListener（）{

        公共无效onItemClick（适配器视图＆LT;＆GT;为arg0，查看ARG1，
                INT位置，长ARG3）{
            // TODO自动生成方法存根
            意图iMenuList =新的意图（HomeMenu.this，
          SecondStep.class）;
iMenuList.putExtra（CATEGORY_NAME，xxx.xxx.xxxx /〜学校/ index.php文件
  / API /指数/ getschools毫克=+ Category_name.get（位置）+＆放大器; SL =+ elementarytxtview）;

            startActivity（iMenuList）;

        }
    }）;

    parseJSONData（）;
}

无效clearData（）{
    Category_ID.clear（）;
    Category_name.clear（）;

}

公共无效parseJSONData（）{

    SelectMenuAPI = Utils.Homemenu2;
    SelectMenuAPI2 = Utils.Homemenu;

    clearData（）;

    尝试 {

        HttpClient的客户端=新DefaultHttpClient（）;
        HttpConnectionParams
                .setConnectionTimeout（client.getParams（），15000）;
        HttpConnectionParams.setSoTimeout（client.getParams（），15000）;
        HttpUriRequest请求=新HTTPGET（SelectMenuAPI）;
        HTT presponse响应= client.execute（要求）;
        InputStream的atomInputStream = response.getEntity（）的getContent（）。
        的BufferedReader在=新的BufferedReader（新的InputStreamReader（
                atomInputStream））;

        串线;
        字符串str =;
        而（（行= in.readLine（））！= NULL）{
            STR + =行;
        }

        HttpClient的客户端2 =新DefaultHttpClient（）;
        HttpConnectionParams.setConnectionTimeout（client2.getParams（），
                15000）;
        HttpConnectionParams.setSoTimeout（client2.getParams（），15000）;
        HttpUriRequest请求2 =新HTTPGET（SelectMenuAPI2）;
        HTT presponse响应2 = client2.execute（请求2）;
        InputStream的atomInputStream2 = response2.getEntity（）的getContent（）。
        的BufferedReader IN2 =新的BufferedReader（新的InputStreamReader（
                atomInputStream2））;

        字符串2号线;
        字符串str2的=;
        而（（2号线= in2.readLine（））！= NULL）{
            STR2 + = 2号线;
        }

        JSONObject的json3 =新的JSONObject（STR2）;
        //消息= json2.getString（信息）;
        状态= json3.getString（状态）;
        如果（status.equals（1））{

            JSONArray school2 = json3.getJSONArray（数据）;

            的String [] MVAL =新的String [school2.length（）];

            的for（int i = 0; I＆LT; school2.length（）;我++）{
                MVAL [I] =
          school2.getJSONObject（我）.getString（标题）;

                Elementarytxt.setText（MVAL [0]）;

                Middletxt.setText（MVAL [1]）;
                Hightxt.setText（MVAL [2]）;
                Atypicaltxt.setText（MVAL [3]）;

            }

            elementarytxtview = MVAL [0];
        }

        JSONObject的json2 =新的JSONObject（STR）;
        //消息= json2.getString（信息）;
        状态= json2.getString（状态）;
        如果（status.equals（1））{

            // JSONObject的数据= json.getJSONObject（数据）;

            JSONArray学校= json2.getJSONArray（数据）;

            的for（int i = 0; I＆LT; school.length（）;我++）{
                的JSONObject对象= school.getJSONObject（我）;

                //
         Category_ID.add（的Long.parseLong（object.getString（ID）））;
                Category_ID.add（（长）一）;
                Category_name.add（object.getString（标题））;

            }

        } 其他 {

            Toast.makeText（此，信息，Toast.LENGTH_SHORT）.show（）;
        }

    }赶上（MalformedURLException异常E）{
        // TODO自动生成的catch块
        e.printStackTrace（）;
    }赶上（IOException异常E）{
        // TODO自动生成的catch块
        // IOConnect = 1;
        e.printStackTrace（）;
    }赶上（JSONException E）{
        // TODO自动生成的catch块
        e.printStackTrace（）;
    }
}

      }

    解决方案

    我不是100％肯定你的意思。

    但是，如果你想类之间方便地访问变量，你应该做的字符串elementarytxtview; 公共静态

    因此​​：公共静态字符串elementarytxtview;

    这也就意味着，基本上是在变量是共享的，可以各阶层之间使用。只需通过编写 HomeMenu.elementarytxtview;你的情况

    how to access value which is out of main class? i want to print value of elementarytxtview in main class in parameter but is print null value of in parameter i want to pass elementarytextview value in parameter to other activity

         public class HomeMenu extends Activity {
ImageButton imgNews, imgContact, imgSetting;
ListView listMainMenu;
ListView Middleschoollist, HighSchoollist, Atipicalschoollist;
String status;
firstscreenadapter mma;
String SelectMenuAPI;
String SelectMenuAPI2;
String url1;
String elementry;

// String High;
String message;
TextView Elementarytxt, Middletxt, Hightxt, Atypicaltxt;
static ArrayList<Long> Category_ID = new ArrayList<Long>();
static ArrayList<String> Category_name = new ArrayList<String>();
String elementarytxtview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.firstscreenfinal);

    ExpandableHeightListView listMainMenu = (ExpandableHeightListView) 
   findViewById(R.id.listMainMenu11);
    ExpandableHeightListView Middleschoollist = (ExpandableHeightListView) 
    findViewById(R.id.listMainMenu22);
    ExpandableHeightListView HighSchoollist = (ExpandableHeightListView) 
   findViewById(R.id.listMainMenu33);
    ExpandableHeightListView Atipicalschoollist = (ExpandableHeightListView) 
         findViewById(R.id.listMainMenu44);

    Elementarytxt = (TextView) findViewById(R.id.Elementaryschool);
    Middletxt = (TextView) findViewById(R.id.MiddleSchool);
    Hightxt = (TextView) findViewById(R.id.HighSchool);
    Atypicaltxt = (TextView) findViewById(R.id.AtipicalSchool);

    mma = new firstscreenadapter(this);

    if (!Utils.isNetworkAvailable(HomeMenu.this)) {
        Toast.makeText(HomeMenu.this, "NO NETWORK Available",
                Toast.LENGTH_SHORT).show();
    }

    if (!Utils.isUserOnline(this)) {
        Toast.makeText(this, "No NETWORK", Toast.LENGTH_LONG).show();
    }

    url1 = "http://198.57.208.46/~school/ajax.php?action=get_school";


    listMainMenu.setAdapter(mma);
    Middleschoollist.setAdapter(mma);
    HighSchoollist.setAdapter(mma);
    Atipicalschoollist.setAdapter(mma);


    listMainMenu.setExpanded(true);
    Middleschoollist.setExpanded(true);
    HighSchoollist.setExpanded(true);
    Atipicalschoollist.setExpanded(true);
    Toast.makeText(this, elementarytxtview, Toast.LENGTH_SHORT).show();
    listMainMenu.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0, View arg1,
                int position, long arg3) {
            // TODO Auto-generated method stub
            Intent iMenuList = new Intent(HomeMenu.this, 
          SecondStep.class);
iMenuList.putExtra("category_name",xxx.xxx.xxxx/~school/index.php
  /api/index/getschools?mg="+ Category_name.get(position)+  "&sl="+elementarytxtview);

            startActivity(iMenuList);

        }
    });

    parseJSONData();
}

void clearData() {
    Category_ID.clear();
    Category_name.clear();

}

public void parseJSONData() {

    SelectMenuAPI = Utils.Homemenu2;
    SelectMenuAPI2 = Utils.Homemenu;

    clearData();

    try {

        HttpClient client = new DefaultHttpClient();
        HttpConnectionParams
                .setConnectionTimeout(client.getParams(), 15000);
        HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
        HttpUriRequest request = new HttpGet(SelectMenuAPI);
        HttpResponse response = client.execute(request);
        InputStream atomInputStream = response.getEntity().getContent();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                atomInputStream));

        String line;
        String str = "";
        while ((line = in.readLine()) != null) {
            str += line;
        }

        HttpClient client2 = new DefaultHttpClient();
        HttpConnectionParams.setConnectionTimeout(client2.getParams(),
                15000);
        HttpConnectionParams.setSoTimeout(client2.getParams(), 15000);
        HttpUriRequest request2 = new HttpGet(SelectMenuAPI2);
        HttpResponse response2 = client2.execute(request2);
        InputStream atomInputStream2 = response2.getEntity().getContent();
        BufferedReader in2 = new BufferedReader(new InputStreamReader(
                atomInputStream2));

        String line2;
        String str2 = "";
        while ((line2 = in2.readLine()) != null) {
            str2 += line2;
        }

        JSONObject json3 = new JSONObject(str2);
        // message = json2.getString("message");
        status = json3.getString("status");
        if (status.equals("1")) {

            JSONArray school2 = json3.getJSONArray("data");

            String[] mVal = new String[school2.length()];

            for (int i = 0; i < school2.length(); i++) {
                mVal[i] = 
          school2.getJSONObject(i).getString("title");

                Elementarytxt.setText(mVal[0]);

                Middletxt.setText(mVal[1]);
                Hightxt.setText(mVal[2]);
                Atypicaltxt.setText(mVal[3]);

            }

            elementarytxtview = mVal[0];
        }

        JSONObject json2 = new JSONObject(str);
        // message = json2.getString("message");
        status = json2.getString("status");
        if (status.equals("1")) {

            // JSONObject data = json.getJSONObject("data");

            JSONArray school = json2.getJSONArray("data");

            for (int i = 0; i < school.length(); i++) {
                JSONObject object = school.getJSONObject(i);

                // 
         Category_ID.add(Long.parseLong(object.getString("id")));
                Category_ID.add((long) i);
                Category_name.add(object.getString("title"));

            }

        } else {

            Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
        }

    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        // IOConnect = 1;
        e.printStackTrace();
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

      }
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    解决方案

    I'm not a 100% sure of what you mean.

    But if you want to access variables easily between classes, you should make the String elementarytxtview; public static

    Thereby: public static String elementarytxtview;

    What that means is basically that the variable is shared and can be used between all classes. Just by writing HomeMenu.elementarytxtview; in your case.

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