Question

问题是它显示我的nullpointer异常，而点击onshowContact按钮有什么不对，我无法弄明白但我没有得到带有此代码的列表视图的对话框按钮单击联系人视图

public void showContacts(View view){
        //View CSV into an array
        try{
        Dialog dialog = new Dialog(NewMessage.this);
        dialog.setContentView(R.layout.contact_view);
        dialog.setTitle("Contacts");

        dialog.setCancelable(true);
        ListView lv = (ListView)findViewById(R.id.lv);
        ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
        int fillarray = 0;
        if(mylist.equals(null)){
            fillarray = 0; 
        }
        else{
            fillarray = mylist.size();
        }*/
        for(int i=0;i<name.size();i++)
        {

            HashMap<String, String> map = new HashMap<String, String>();
            map.put("name",name.get(i));
            map.put("number",number.get(i));
            map.put("status",status.get(i));
            mylist.add(map);
        }
        SimpleAdapter mSchedule = new SimpleAdapter(NewMessage.this, mylist, R.layout.view_csv, new String[] {"name","number","status"}, new int[] {R.id.t1,R.id.t2,R.id.t3});
        lv.setAdapter(mSchedule);
    dialog.show();
        }
        catch(Exception e){
            Toast.makeText(NewMessage.this, e.toString(), 2000).show();
        }
//Viewing Finish Here

    }

这是我的contact_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <ListView
        android:id="@+id/lv"
        android:layout_width="wrap_content"
        android:layout_height="397dp" >
    </ListView>

</LinearLayout>

这是我的view_csv.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:paddingTop="4dip"
    android:paddingBottom="6dip"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView 
    android:id="@+id/t1"
    android:layout_width="90dip"
    android:layout_height="wrap_content"
    android:text="text1"/>
     <TextView 
     android:id="@+id/t2"
    android:layout_width="90dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="text2"/>
      <TextView 
     android:id="@+id/t3"
    android:layout_width="50dip"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="text3" />    

</LinearLayout>

Answer 1

您的ListView正在contact_view布局下。所以你必须通过对话框初始化列表。因为您的对话框包含dialog.setContentView(R.layout.contact_view);

的布局

所以你必须初始化列表，如：

 ListView lv = (ListView) dialog.findViewById(R.id.lv);

没有在DIalog框上获得列表视图

1 个答案: