Question

我有关于在字符串数组中传递字符串数组的问题。当moduleType =“v”时，我编写了以下代码来存储标题，信息和发言人。代码使用bundle将字符串数组放入PopulateData活动中，并将其传递给下一个actvity，即DataList Activity。我的代码如下：

PopulateData.java

for(int i = 0; i < moduleTypes.length; i++){
            String moduleType = moduleTypes[i];
            JSONObject jsonModule = new JSONObject(content[i]);
            //Bundle[] bundle = new Bundle[jsonModule.length()];
            Log.i(TAG, "ModuleType = v " + (moduleType == "v"));
            Log.i(TAG, "ModuleType = v " + moduleType.equals("v"));
            Log.i(TAG, "ModuleType =  " + moduleType);
            Log.i(TAG, "ModuleType Length =  " + moduleTypes.length);
            if(moduleType.equals("v")){
                //String[] title = new String[jsonModule.length()];
                //String[] info = new String[jsonModule.length()];
                //String[] speaker = new String[jsonModule.length()];
                String[] videoTypes = dbAdapter.collectVideoTypeFromListTable();
                String[] title = new String[videoTypes.length];
                String[] info = new String[videoTypes.length];
                String[] speaker = new String[videoTypes.length];
                title[i] = jsonModule.getString("title");
                info[i] = jsonModule.getString("info");
                speaker[i] = jsonModule.getString("speaker");
                Log.i(TAG, "titleArray");
                Log.i(TAG,title[i]);
                Log.i(TAG, "infoArray");
                Log.i(TAG,info[i]);
                Log.i(TAG, "speakerArray");
                Log.i(TAG,speaker[i]);

                bundle.putStringArray("titleArray", title);
                bundle.putStringArray("infoArray", info);
                bundle.putStringArray("speakerArray", speaker);
                bundle.putString("date", strDate);

            }
            intent.putExtras(bundle);

        }

DataList.java

bundle = getIntent().getExtras();
        title = bundle.getStringArray("titleArray");
        Log.i(TAG, "Title Size="+String.valueOf(title.length));
        info = bundle.getStringArray("infoArray");
        Log.i(TAG, "Info Size="+String.valueOf(info.length));
        speaker = bundle.getStringArray("speakerArray");
        Log.i(TAG, "Speaker Size="+String.valueOf(speaker.length));
        date = bundle.getString("date");
        Log.i(TAG, "Bundle Size="+String.valueOf(bundle.size()));
        Log.i(TAG, ""+title[0]);
        //bundle.p
        //title = bundle.getString("title");
        //info = bundle.getString("info");
        //speaker = bundle.getString("speaker");
        for(int i = 0; i < title.length; i++){
            Log.i(TAG, "title["+i+"]"+title[i]);
            Log.i(TAG, "info["+i+"]"+info[i]);
            Log.i(TAG, "speaker["+i+"]"+speaker[i]);
            Log.i(TAG, date);
            Content content = new Content(title[i], info[i], speaker[i], date);
            contentList.add(content);
        }

DDMS：

01-09 18:53:04.305: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.305: INFO/PopulateData(435): ModuleType = v true
01-09 18:53:04.305: INFO/PopulateData(435): ModuleType =  v
01-09 18:53:04.305: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.315: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.315: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.315: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.325: INFO/PopulateData(435): titleArray
01-09 18:53:04.325: INFO/PopulateData(435): Capital Budgeting
01-09 18:53:04.325: INFO/PopulateData(435): infoArray
01-09 18:53:04.325: INFO/PopulateData(435): Bhaavesh bhai will give full to training of Capital budgeting to team deltecs. All the best for him.
01-09 18:53:04.325: INFO/PopulateData(435): speakerArray
01-09 18:53:04.325: INFO/PopulateData(435): Bhaavesh Bhai
01-09 18:53:04.325: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.325: INFO/PopulateData(435): ModuleType = v true
01-09 18:53:04.335: INFO/PopulateData(435): ModuleType =  v
01-09 18:53:04.335: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.345: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.345: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.345: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.345: INFO/PopulateData(435): titleArray
01-09 18:53:04.345: INFO/PopulateData(435): Nixon Cameras
01-09 18:53:04.345: INFO/PopulateData(435): infoArray
01-09 18:53:04.355: INFO/PopulateData(435): Nixon India is a leading camera manufacters in India.
01-09 18:53:04.355: INFO/PopulateData(435): speakerArray
01-09 18:53:04.355: INFO/PopulateData(435): Nixon India
01-09 18:53:04.355: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.365: INFO/PopulateData(435): ModuleType = v true
01-09 18:53:04.365: INFO/PopulateData(435): ModuleType =  v
01-09 18:53:04.365: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.375: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.375: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.375: INFO/DronaDBAdapter(435): Type: v
01-09 18:53:04.385: INFO/PopulateData(435): titleArray
01-09 18:53:04.385: INFO/PopulateData(435): Nixon Cameras
01-09 18:53:04.385: INFO/PopulateData(435): infoArray
01-09 18:53:04.385: INFO/PopulateData(435): Nixon India is a leading camera manufacters in India.
01-09 18:53:04.385: INFO/PopulateData(435): speakerArray
01-09 18:53:04.395: INFO/PopulateData(435): Nixon India
01-09 18:53:04.395: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.395: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.395: INFO/PopulateData(435): ModuleType =  n
01-09 18:53:04.405: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.405: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.405: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.415: INFO/PopulateData(435): ModuleType =  n
01-09 18:53:04.415: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.415: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.415: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.425: INFO/PopulateData(435): ModuleType =  n
01-09 18:53:04.425: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.425: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.425: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.435: INFO/PopulateData(435): ModuleType =  e
01-09 18:53:04.435: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.445: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.445: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.445: INFO/PopulateData(435): ModuleType =  q
01-09 18:53:04.445: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.455: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.455: INFO/PopulateData(435): ModuleType = v false
01-09 18:53:04.455: INFO/PopulateData(435): ModuleType =  s
01-09 18:53:04.465: INFO/PopulateData(435): ModuleType Length =  9
01-09 18:53:04.465: INFO/ActivityManager(59): Starting activity: Intent { cmp=com.drona.app/.DataList (has extras) }
01-09 18:53:04.545: INFO/DataList(435): Title Size=3
01-09 18:53:04.545: INFO/DataList(435): Info Size=3
01-09 18:53:04.545: INFO/DataList(435): Speaker Size=3
01-09 18:53:04.545: INFO/DataList(435): Bundle Size=4
01-09 18:53:04.555: INFO/DataList(435): null
01-09 18:53:04.555: INFO/DataList(435): title[0]null
01-09 18:53:04.555: INFO/DataList(435): info[0]null
01-09 18:53:04.555: INFO/DataList(435): speaker[0]null
01-09 18:53:04.565: INFO/DataList(435): Jan 09
01-09 18:53:04.565: INFO/DataList(435): title[1]null
01-09 18:53:04.565: INFO/DataList(435): info[1]null
01-09 18:53:04.565: INFO/DataList(435): speaker[1]null
01-09 18:53:04.565: INFO/DataList(435): Jan 09
01-09 18:53:04.565: INFO/DataList(435): title[2]Nixon Cameras
01-09 18:53:04.575: INFO/DataList(435): info[2]Nixon India is a leading camera manufacters in India.
01-09 18:53:04.575: INFO/DataList(435): speaker[2]Nixon India
01-09 18:53:04.575: INFO/DataList(435): Jan 09

正如DDMS中出现的那样，我在第一个活动中作为bundle传递给数组的值正在正确显示，但是当它们转到下一个活动时，它们变为空。为什么会这样？我做错了什么？

Answer 1

这段代码可能是您的问题：

bundle.putStringArray("titleArray", title);
bundle.putStringArray("infoArray", info);
bundle.putStringArray("speakerArray", speaker);
bundle.putString("date", strDate);

每次循环时，您都要替换以前的值，因为每个捆绑的值都会在迭代中键入相同的键。你可以通过几种方式解决这个问题：

使用数组数组
在每个数据的末尾添加一个数字，并放置并跟踪数据包中应该可用的总数，以便了解循环的时间
将所有这些信息放入某种可分配的bean中，然后将这些bean中的每一个包裹在PopulateData中

Answer 2

您还需要将信息发送到下一个活动视图包。数据仅发送给它发送的活动。

我认为没关系，因为它只是持久存在的键值对。像这样......

// my list of names, icon locations
Map<String, String> info = new HashMap<String, String>();
nameIcons.put("titleArray", title);
nameIcons.put("infoArray", info);

然后将它们存储在共享首选项中。

SharedPreferences keyValues = getContext().getSharedPreferences("info_preferences"), Context.MODE_PRIVATE);
SharedPreferences.Editor keyValuesEditor = keyValues.edit();

for (String s : info.keySet()) {

keyValuesEditor.pustString(s, info.get(s));
}

为什么存储在数组中的值作为在android中显示为null的bundle传递

2 个答案: