从动态创建的布局中查找其他子视图答案

【问题标题】：Find other child Views from dynamically created layout从动态创建的布局中查找其他子视图
【发布时间】：2017-03-22 23:16:45
【问题描述】：

我有一个微调器，当用户选择一个值时，onItemSelectedListener 会打开一个对话框来放置更多详细信息

private AdapterView.OnItemSelectedListener spinnerListeners=new AdapterView.OnItemSelectedListener(){
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        switch (parent.getId()){
            case R.id.puttSpinner:
                // open dialog to enter Additional putt Stats
                if(position > 0 ) {
                    AlertDialog.Builder alertDialog = new AlertDialog.Builder(v.getContext());
                    LinearLayout layout = new LinearLayout(v.getContext());
                    LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,     LinearLayout.LayoutParams.WRAP_CONTENT);layout.setOrientation(LinearLayout.VERTICAL);layout.setLayoutParams(parms);
                    layout.setGravity(Gravity.CLIP_VERTICAL);
                    layout.setPadding(2, 2, 2, 2);
                    for (int i=1;i<position+1;i++){
                        LinearLayout ll = new LinearLayout(v.getContext());
                        LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(
                                LinearLayout.LayoutParams.MATCH_PARENT,
                                LinearLayout.LayoutParams.WRAP_CONTENT);
                        ll.setOrientation(LinearLayout.HORIZONTAL);
                        ll.setLayoutParams(llp);
                        TextView tv = new TextView(v.getContext());
                        tv.setText("Putt "+String.valueOf(i)+":");
                        tv.setPadding(40, 40, 40, 40);
                        tv.setGravity(Gravity.CENTER);
                        tv.setTextSize(20);
                        LinearLayout.LayoutParams tvParams = new LinearLayout.LayoutParams(
                                LinearLayout.LayoutParams.MATCH_PARENT,
                                LinearLayout.LayoutParams.WRAP_CONTENT);
                        tvParams.bottomMargin = 5;
                        //ll.addView(tv,tvParams);
                        ll.addView(tv);

                        Spinner s = new Spinner(v.getContext());
                        String[] puttDistList = getResources().getStringArray(R.array.putt_dist_list);
                        s.setAdapter(new ArrayAdapter<String>(v.getContext(),R.layout.putting_practice, puttDistList));
                        s.setOnItemSelectedListener(puttDistSelectListener);
                        LinearLayout.LayoutParams sParams = new LinearLayout.LayoutParams(
                                LinearLayout.LayoutParams.WRAP_CONTENT,
                                LinearLayout.LayoutParams.WRAP_CONTENT);
                        ll.addView(s,sParams);

                        layout.addView(ll);
                    }
                    alertDialog.setView(layout);
                    alertDialog.setTitle("Putting Stats - Distance to Pin");
                    alertDialog.setNegativeButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
                    alertDialog.show();
                }

                break;
        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
};

现在，当用户从 Dialog Spinner s 中选择值时，它的侦听器会使用用户输入更新数据库，但我如何获取与此微调器关联的 TextView tv 的文本值

TextView 和 Spinner 都包含在父布局“布局”中动态创建的线性布局“ll”中。两者都是动态创建的

提前致谢

final AdapterView.OnItemSelectedListener puttDistSelectListener = new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        //add the putt# and distance to temp_putt_stats table
        DbAdapter adapter = new DbAdapter(view.getContext());
         String distValue = parent.getItemAtPosition(position).toString();
        switch (position){
            case 0: //Inches
                break;
            case 1: //<3ft
                break;
            case 2: //<6 ft
                break;
            case 3: //<10 ft
                break;
            case 4: //10-20
                break;
            case 5: //20-30
                break;
            case 6: //30-40
                break;
            case 7: //> 40
                break;
        }
        Toast.makeText(view.getContext(), "Position :"+position+"  ListItem : " +distValue ,Toast.LENGTH_SHORT).show();

    }

【问题讨论】：

标签： android android-layout onitemselectedlistener

【解决方案1】：

你可以使用标签。

在生成布局时，您可以将标签 (setTag()) 分配给项目 (1-x)，然后您可以执行以下操作：

final AdapterView.OnItemSelectedListener puttDistSelectListener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    //add the putt# and distance to temp_putt_stats table
    DbAdapter adapter = new DbAdapter(view.getContext());
     String distValue = parent.getItemAtPosition(position).toString();
    int tagNumber = (int) view.getTag();
    switch (tagNumber ){
        case 0: //Inches
            break;
        case 1: //<3ft
            break;
        case 2: //<6 ft
            break;
        case 3: //<10 ft
            break;
        case 4: //10-20
            break;
        case 5: //20-30
            break;
        case 6: //30-40
            break;
        case 7: //> 40
            break;
    }
    Toast.makeText(view.getContext(), "Position :"+position+"  ListItem : " +distValue ,Toast.LENGTH_SHORT).show();

}

所选项目的文本可以被检索到

TextView tv = (TextView) view.findViewByTag(x);
tv.getText();

【讨论】：

我收到了NPE 提供的解决方案
您还必须为微调器项目（不是 arrayadapter）使用自定义适配器，并且在这个新适配器的 onBindView 中，您可以为 textviews 分配标签

【解决方案2】：

对于 API 17 及更高版本，您可以为您生成的每个 View 生成一个 id，并将其设置为 setId()。请参阅generateViewId 和setid。

Xiaochao Yang 在回答this Stack Overflow 问题时解释了这一点以及在 API 17 之前要做什么。

设置生成的 id 后，您可以使用findViewById() 在父布局中查找视图。

【讨论】：