Switch isChecked 布尔值 Android

Question

我有一个如下图所示的开关。

我输入联盟的名称，然后通过网络服务创建了一个联盟。

开关密码是。

aSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    openLeague="OPEN";
                }else{
                    openLeague = "CLOSED";
                }
            }
        });

按钮代码...

 btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                session = new SessionManager(getApplicationContext());
                leagueName = teamTextField.getText().toString();


                if (!leagueName.isEmpty()) {

                    createLeague(leagueName, username, password, start, end, openLeague);

                } else {
                    Toast.makeText(getApplicationContext(),
                            "Please enter your details!", Toast.LENGTH_LONG)
                            .show();
                }
            }
        });

createLeague(...) 包含网络服务。我发布了六个变量。我感兴趣的是 open_league.

private void createLeague(final String leagueName, final String username, final String password,final String start,final String end,final String openLeague) {
    String tag_json_obj = "json_obj_req";



    final HashMap<String, String> postParams = new HashMap<String, String>();

    postParams.put("league_name",leagueName);

    postParams.put("username",username);
    postParams.put("password",password);
    postParams.put("league_start",start);

    postParams.put("league_finish",end);
    postParams.put("open_league",openLeague);

    Response.Listener<JSONObject>  listener;
    Response.ErrorListener errorListener;
    final JSONObject jsonObject = new JSONObject(postParams);

    JsonObjectRequest jsonObjReq = new JsonObjectRequest(AppConfig.URL_CREATE_LEAGUE, jsonObject,
            new com.android.volley.Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {
                    Log.d("TAG", response.toString());
                    try {

                        if (response.getString("status").equals("success")){

                            Intent i = new Intent(CreateLeague.this, League.class);
                            startActivity(i);
                            finish();

                        }
                    } catch (JSONException e) {
                        Log.e("TAG", e.toString());
                    }
                    //pDialog.dismiss();
                }
            }, new com.android.volley.Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            //VolleyLog.d("TAG", "Error: " + error.getMessage());
            //pDialog.dismiss();

        }
    }) {

        @Override
        public String getBodyContentType() {
            return "application/json; charset=utf-8";
        }


    };

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
    // VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(jsonObjRequest);
}

我在这行之前打了个断点

sonObjectRequest jsonObjReq = new JsonObjectRequest(AppConfig.URL_CREATE_LEAGUE, jsonObject,
            new com.android.volley.Response.Listener<JSONObject>()

检查我发送的json。所以当开关打开时我得到。

{
 "league_start":"28-07-2015 09:37:43",
 "username":"cerberus_30@gmail.com",
 "league_finish":"11-08-2015 09:37:43",
 "league_name":"Samsung League",
 "password":"larissa",
 "open_league":"OPEN"
}

您看到 open_league json 变量已打开。但是，当开关关闭时，open_league 变量为空！为什么是这样？我已将 open_league 放入我的开关侦听器中，当它打开时关闭时关闭时 "OPEN" 。谢谢。

Answer 1

你的错误很简单，修正一下，

open_league = "CLOSED";

您尚未初始化变量但正在尝试使用它。

打开开关没有问题，因为变量已经赋值给"OPEN"
但是当您尝试在关闭状态下使用它时，您会得到 null 值，因为变量尚未初始化

永远记得在这种情况下将变量初始化为默认值。在您的情况下，默认值是 "CLOSED" 以将其初始化为 "CLOSED".

Switch isChecked 布尔值 Android

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