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在我的应用程序中，我有一个场景，我需要在许多情况下显示带有标题的 listView。

所以我创建了一个 gen_list_layout.xml，其中包含一个 TextView 和一个 ListView。

现在要显示列表，我计划创建一个方法“public static AlertDialog createAlertDialog(String title, String[] items, Activity activity)”，我可以在其中创建相同的 AlertDialog。

    public AlertDialog createAlertDialog(Activity act, String title, String[] items) {
    LayoutInflater layoutInflater   = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View view = layoutInflater.inflate(R.layout.gen_list_layout,null);

    TextView titleTv = (TextView) view.findViewById(R.id.genListTitTv);
    titleTv.setText(title);

    ArrayAdapter<String> ad = new ArrayAdapter<String>(this, R.layout.list_item, R.id.genList, items);
    ListView listView = (ListView) findViewById(R.id.genList);
    listView.setAdapter(ad);
    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

     // I WANT THIS TO BE HNDLED IN THE ACTIVITY CALLING    
    listView.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View v, int position,  long id) {              
        }

    });

    AlertDialog.Builder scrnDlg = new AlertDialog.Builder(act);
    scrnDlg.setView(view);

    final AlertDialog adg = scrnDlg.create();

    return adg;
}

我将在需要列表的任何地方从不同的 Activity 调用 createAlertDialog()。

  AlertDialog ad = Components.createAlertDialog(RouteListActivity.this, title, items);

现在如何处理 AlertDialog 中的 ListView 的点击事件？

任何线索，如何实施。

更新 我在实施您的方法后更新了我的 Q 并且我看到了一个异常。无法获取异常的原因。我创建了一个类并添加了 createAlertDialog ：

public class ListAlertDialog {

public AlertDialog createAlertDialog(Activity act, String title, String[] items, OnItemClickListener clickListener) {
    Log.i("ListAD", "Start to create Alert Dialog");
    LayoutInflater layoutInflater   = (LayoutInflater)act.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    View view = layoutInflater.inflate(R.layout.gen_list_layout, null);

    Log.i("ListAD", "Got View :" + view.getId());
    TextView titleTv = (TextView) view.findViewById(R.id.genListTitTv);
    titleTv.setText(title);
    Log.i("ListAD", "Set Title TV : " + titleTv.getId());

    ArrayAdapter<String> ad = new ArrayAdapter<String>(act, R.layout.list_item, R.id.genList, items);
    Log.i("ListAD", "Created Adapter");
    ListView listView = (ListView) view.findViewById(R.id.genList);
    listView.setAdapter(ad);
    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    Log.i("ListAD", "Got ListView :" + listView.getId() + " & Set Adapter");

    listView.setOnItemClickListener(clickListener);
    Log.i("ListAD", "Added Listerner to listView : " + clickListener.getClass());

    AlertDialog.Builder scrnDlg = new AlertDialog.Builder(act);
    scrnDlg.setView(view);
    Log.i("ListAD", "Set View of scrnDlg");

    final AlertDialog adg = scrnDlg.create();
    Log.i("ListAD", "Created Alert Dialog & returning it : " + adg );       
    return adg;
}
}

我的 gen_list.layout.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="wrap_content" 
    android:orientation="vertical">
    <TextView android:id="@+id/genListTitTv" style="@style/inPageTitleStyle"             
        android:text="" />

    <ListView android:id="@+id/genList" android:layout_width="match_parent" android:layout_height="wrap_content"
        android:dividerHeight="0dp" android:divider="@null" />
</LinearLayout>

在我的活动中，我调用为：

        ListAlertDialog lad = new ListAlertDialog();
    AlertDialog ad = lad.createAlertDialog(Mumbai77Activity.this, "Select", items, clickListener);
    Log.i(TAG, "Got the AD in Activity : " + ad + " ABT to Show");
    ad.show();
    Log.i(TAG, "Shown ad");

我在日志中得到的错误是 NullPointerException ：

08-30 12:52:00.247: I/ListAD(366): Start to create Alert Dialog
08-30 12:52:00.257: I/ListAD(366): Got View :-1
08-30 12:52:00.257: I/ListAD(366): Set Title TV : 2131230764
08-30 12:52:00.257: I/ListAD(366): Created Adapter
08-30 12:52:00.257: I/ListAD(366): Got ListView :2131230765 & Set Adapter
08-30 12:52:00.267: I/ListAD(366): Added Listerner to listView : class    org.mumbai77.core.Mumbai77Activity$2
08-30 12:52:00.267: I/ListAD(366): Set View of scrnDlg
08-30 12:52:00.267: I/ListAD(366): Created Alert Dialog & returning it : android.app.AlertDialog@44f29668
08-30 12:52:00.267: I/Mumbai77(366): Got the AD in Activity : android.app.AlertDialog@44f29668 ABT to Show
08-30 12:52:00.297: I/Mumbai77(366): Shown ad
08-30 12:52:00.417: D/AndroidRuntime(366): Shutting down VM
08-30 12:52:00.417: W/dalvikvm(366): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-30 12:52:00.437: E/AndroidRuntime(366): FATAL EXCEPTION: main
08-30 12:52:00.437: E/AndroidRuntime(366): java.lang.NullPointerException
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:353)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.AbsListView.obtainView(AbsListView.java:1315)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1198)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.ListView.onMeasure(ListView.java:1109)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.View.measure(View.java:8171)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.View.measure(View.java:8171)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.View.measure(View.java:8171)
08-30 12:52:00.437: E/AndroidRuntime(366):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
 ................

在查看异常时，我无法得到实际问题，但在查看我添加的日志时，我可以看到 Got View : -1 I beleiveView view = layoutInflater.inflate(R.layout.gen_list_layout, null);有一些问题。它无法获得视图或类似的东西。

知道 View 可能有什么问题 - 为什么它没有获得布局视图？在布局或 inflate() 中对 b 进行了任何修改？

任何帮助都非常感谢..

谢谢

4

1 回答 1

3

您可以将 anOnItemClickListener作为参数传递给您的createAlertDialog方法。

创建者方法：

public AlertDialog createAlertDialog(Activity act, String title, String[] items, OnItemClickListener clickListener) {
LayoutInflater layoutInflater   = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
View view = layoutInflater.inflate(R.layout.gen_list_layout,null);

TextView titleTv = (TextView) view.findViewById(R.id.genListTitTv);
titleTv.setText(title);

ArrayAdapter<String> ad = new ArrayAdapter<String>(this, R.layout.list_item, R.id.genList, items);
ListView listView = (ListView) findViewById(R.id.genList);
listView.setAdapter(ad);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

 // I WANT THIS TO BE HNDLED IN THE ACTIVITY CALLING    
listView.setOnItemClickListener(clickListener);

AlertDialog.Builder scrnDlg = new AlertDialog.Builder(act);
scrnDlg.setView(view);

final AlertDialog adg = scrnDlg.create();

return adg;
}

您的活动：

OnItemClickListener clickListener = new OnItemClickListener() {
    public void onItemClick(AdapterView<?> arg0, View v, int position,  long id) {
         // Do some stuff in your activity's scope here. 
    }
}

AlertDialog ad = Components.createAlertDialog(RouteListActivity.this, title, items, clickListener);
于 2012-08-29T16:51:10.167 回答