仅将一部分数据显示到列表视图中并获取新活动 android studio 中的所有值？

Posted 2023-04-19

【中文标题】仅将一部分数据显示到列表视图中并获取新活动 android studio 中的所有值？

【英文标题】：Show only one part of data into listview and get all values in new activity android studio?

【发布时间】：2020-08-04 11:36:33

【问题描述】：

我有一个问题。 我是 android studio 的新手，尝试了很多不同的测试方法。 现在我制作了一个小程序，我可以在其中单击一个按钮，它会使用一个列表视图启动一个新活动，该列表视图向我显示从 json 数据中提取的 mysql 中的一些数据。

到目前为止，当您单击列表视图中的产品时，它会打开一个带有 textview 的新活动测试，并显示列表视图中过去的数据。

我的问题如下。

我想从列表视图中的选定行加载所有数据并在新活动中显示该数据。

但是我该怎么做呢？

我对 loadintolistview 的代码部分是这样的。：

    private void loadIntoListView(String json) throws JSONException 
    JSONArray jsonArray = new JSONArray(json);
    String[] stocks = new String[jsonArray.length()];
    //String[] stockstot = new String[jsonArray.length()];
    for (int i = 0; i < jsonArray.length(); i++) 
        JSONObject obj = jsonArray.getJSONObject(i);
        stocks[i] = obj.getString("DatumTot") + " " +  obj.getString("Product")+ " " + obj.getString("Prod_Nr")+ " " + obj.getString("Batch_Nr")+ " " + obj.getString("Orders")+ " " + obj.getString("Lijn")+ " " + obj.getString("FP");
        //stockstot[i] = obj.getString("DatumTot") + " " +obj.getString("Product")+ " " +obj.getString("Prod_Nr")+ " " +obj.getString("Batch_Nr")+ " " +obj.getString("Orders")+ " " +obj.getString("Lijn")+ " " +obj.getString("FP")+ " " +obj.getString("PeroxideType")+ " " +obj.getString("PeroxideProcent")+ " " +obj.getString("FlakeA")+ " " +obj.getString("FlakeSiloA")+ " " +obj.getString("FlakeB")+ " " +obj.getString("FlakeSiloB")+ " " +obj.getString("AggloProcent")+ " " +obj.getString("AggloSilo")+ " " +obj.getString("RecycleProcent")+ " " +obj.getString("RecycleSilo")+ " " +obj.getString("MVRml10ml")+ " " +obj.getString("MVRSTD")+ " " +obj.getString("MFRg10ml")+ " " +obj.getString("AshProcent")+ " " +obj.getString("VochtProcent")+ " " +obj.getString("KleurL")+ " " +obj.getString("KleurA")+ " " +obj.getString("KleurB")+ " " +obj.getString("Operator1")+ " " +obj.getString("FlakeType1")+ " " +obj.getString("FlakeType2")+ " " +obj.getString("Productielijn1")+ " " +obj.getString("Productielijn2")+ " " +obj.getString("FlakeBatchNr1")+ " " +obj.getString("FlakeBatchNr2")+ " " +obj.getString("FlakeVochtProcent1")+ " " +obj.getString("FlakeVochtProcent2")+ " " +obj.getString("FlakeKleurL1")+ " " +obj.getString("FlakeKleurL2")+ " " +obj.getString("FlakeKleurA1")+ " " +obj.getString("FlakeKleurA2")+ " " +obj.getString("FlakeKleurB1")+ " " +obj.getString("FlakeKleurB2")+ " " +obj.getString("Remark1")+ " " +obj.getString("Remark2")+ " " +obj.getString("Remark3")+ " " +obj.getString("MeltDens")+ " " +obj.getString("Reg_sample");

    
    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, stocks);
    listView.setAdapter(arrayAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
            String selectedItem = (String) parent.getItemAtPosition(position);

            //Create the bundle
            Bundle bundle = new Bundle();

            //Add your data to bundle
            bundle.putString("stuff", selectedItem);

            Toast.makeText(getApplicationContext(), selectedItem, Toast.LENGTH_LONG).show();//display the text of button1
            Intent appInfo = new Intent(Extrusie1Activity.this, Extrusion1infoActivity.class);

            //Add the bundle to the intent
            appInfo.putExtras(bundle);

            startActivity(appInfo);
        
    );

如您所见，带有 String[] stocktot 的部分是我希望在新活动中看到的所有数据。 有人可以帮助我吗？

【问题讨论】：

启用 String[] stocktot 和 onItemClick 的注释代码，将 String selectedItem = (String) parent.getItemAtPosition(position); 更改为 String selectedItem = stockstot[position]; 希望有帮助！

【参考方案1】：

当你点击一个你已经访问过字符串的项目时，只需通过意图将它传递给下一个活动，如下所示：

更新

这样做：

 ..........
 JSONArray jsonArray = new JSONArray(json);
 //add this
 List<String> items = new ArrayList<String>();
 String[] stocks = new String[jsonArray.length()];

循环

for (int i = 0; i < jsonArray.length(); i++) 

    JSONObject obj = jsonArray.getJSONObject(i);
    stocks[i] = obj.getString("DatumTot") + " " +  obj.getString("Product")+ " " + obj.getString("Prod_Nr")+ " " + obj.getString("Batch_Nr")+ " " + obj.getString("Orders")+ " " + obj.getString("Lijn")+ " " + obj.getString("FP");


    String full = obj.getString("DatumTot") + " " +obj.getString("Product")+ " " +obj.getString("Prod_Nr")+ " " +obj.getString("Batch_Nr")+ " " +obj.getString("Orders")+ " " +obj.getString("Lijn")+ " " +obj.getString("FP")+ " " +obj.getString("PeroxideType")+ " " +obj.getString("PeroxideProcent")+ " " +obj.getString("FlakeA")+ " " +obj.getString("FlakeSiloA")+ " " +obj.getString("FlakeB")+ " " +obj.getString("FlakeSiloB")+ " " +obj.getString("AggloProcent")+ " " +obj.getString("AggloSilo")+ " " +obj.getString("RecycleProcent")+ " " +obj.getString("RecycleSilo")+ " " +obj.getString("MVRml10ml")+ " " +obj.getString("MVRSTD")+ " " +obj.getString("MFRg10ml")+ " " +obj.getString("AshProcent")+ " " +obj.getString("VochtProcent")+ " " +obj.getString("KleurL")+ " " +obj.getString("KleurA")+ " " +obj.getString("KleurB")+ " " +obj.getString("Operator1")+ " " +obj.getString("FlakeType1")+ " " +obj.getString("FlakeType2")+ " " +obj.getString("Productielijn1")+ " " +obj.getString("Productielijn2")+ " " +obj.getString("FlakeBatchNr1")+ " " +obj.getString("FlakeBatchNr2")+ " " +obj.getString("FlakeVochtProcent1")+ " " +obj.getString("FlakeVochtProcent2")+ " " +obj.getString("FlakeKleurL1")+ " " +obj.getString("FlakeKleurL2")+ " " +obj.getString("FlakeKleurA1")+ " " +obj.getString("FlakeKleurA2")+ " " +obj.getString("FlakeKleurB1")+ " " +obj.getString("FlakeKleurB2")+ " " +obj.getString("Remark1")+ " " +obj.getString("Remark2")+ " " +obj.getString("Remark3")+ " " +obj.getString("MeltDens")+ " " +obj.getString("Reg_sample");

   //add to list

   items.add(full);

点击项目：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
        String selectedItem = (String) parent.getItemAtPosition(position);

        //get the full item to pass

        String fullItem = items.get(postion);

        Intent appInfo = new Intent(Extrusie1Activity.this, Extrusion1infoActivity.class);

        appInfo.putExtra("data",fullItem);

        startActivity(appInfo);
    
);

在Extrusion1infoActivity活动中create()：

String dataToShow = getIntent().getStringExtra("data");

【讨论】：

但是，如果您查看 //stockstot[i] 部分，这并不是我的全部数据。如果我加载所有这些，那么它会为列表视图而努力。我只想在我的列表视图中查看 json 文件的某些部分，如果我点击它，那么我想查看点击项目的所有数据

谢谢你，mutch，它的工作原理，就是我喜欢它:)

1 个问题，是否也可以拆分 JSON 文件，以便我可以将这些值用于数组列表？也许在那个屏幕上也是全局的？