如何使用AutoCompleteTextView android显示联系人？

Question

我想在我的应用程序中使用AutoCompleteTextView显示联系人。 我用谷歌搜索并使用了一些来自堆栈溢出的代码，但有时它无法正常工作，有时也崩溃了。 请任何人在这方面帮助我。

custcontview.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:layout_margin="10dp"
    android:padding="10dp"
    card_view:cardBackgroundColor="#ffffff"
    card_view:cardCornerRadius="1dp"
    android:layout_marginLeft="15dp"

    card_view:cardElevation="5dp"

    card_view:contentPadding="2dp">

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginBottom="10dp"
            android:weightSum="2">
    <TextView
        android:id="@+id/ccontName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Large Text"
        android:layout_weight="1"
        android:textSize="15sp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/ccontNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/ccontName"
        android:text="Medium Text"
        android:layout_weight="1"
       android:textSize="15sp"
        android:textAppearance="?android:attr/textAppearanceMedium" />
        </LinearLayout>

    <TextView
        android:id="@+id/ccontType"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/ccontNo"
        android:layout_alignParentRight="true"
        android:layout_marginRight="14dp"
        android:text="Small Text"
        android:textSize="15sp"
        android:visibility="gone"
        android:textColor="#A5000000"
        android:textAppearance="?android:attr/textAppearanceSmall" />
</android.support.v7.widget.CardView>

mianfragment.java：

 AutoCompleteTextView mobile_prepaid_mobilenum_edttxt;
   private ArrayList<Map<String, String>> mPeopleList;

在OnCreate：

mPeopleList = new ArrayList<Map<String, String>>();
mobile_prepaid_mobilenum_edttxt = (AutoCompleteTextView) lay.findViewById(R.id.mobile_prepaid_mobilenum_edttxt);
        new Task1().execute();
        mAdapter = new SimpleAdapter(getActivity(), mPeopleList, R.layout.custcontview ,new String[] { "Name", "Phone" , "Type" }, new int[] { R.id.ccontName, R.id.ccontNo, R.id.ccontType });

        mobile_prepaid_mobilenum_edttxt.setAdapter(mAdapter);
        mobile_prepaid_mobilenum_edttxt.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> av, View arg1, int index, long arg3) {
                Map<String, String> map = (Map<String, String>) av.getItemAtPosition(index);
                String name = map.get("Name");
                String number = map.get("Phone");
                mobile_prepaid_mobilenum_edttxt.setText(number);
            }
        });
}
 public void PopulatePeopleList()
    {

        mPeopleList.clear();

        Cursor people = getActivity().getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);

        while (people.moveToNext())
        {
            String contactName = people.getString(people.getColumnIndex(
                    ContactsContract.Contacts.DISPLAY_NAME));

            String contactId = people.getString(people.getColumnIndex(
                    ContactsContract.Contacts._ID));
            String hasPhone = people.getString(people.getColumnIndex(
                    ContactsContract.Contacts.HAS_PHONE_NUMBER));

            if ((Integer.parseInt(hasPhone) > 0))
            {

                // You know have the number so now query it like this
                Cursor phones = getActivity().getContentResolver().query(
                        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                        null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId,
                        null, null);
                while (phones.moveToNext()) {

                    //store numbers and display a dialog letting the user select which.
                    String phoneNumber = phones.getString(
                            phones.getColumnIndex(
                                    ContactsContract.CommonDataKinds.Phone.NUMBER));

                    String numberType = phones.getString(phones.getColumnIndex(
                            ContactsContract.CommonDataKinds.Phone.TYPE));

                    Map<String, String> NamePhoneType = new HashMap<String, String>();

                    NamePhoneType.put("Name", contactName);
                    NamePhoneType.put("Phone", phoneNumber.replace("-",""));

                    if(numberType.equals("0"))
                        NamePhoneType.put("Type", "Work");
                    else
                    if(numberType.equals("1"))
                        NamePhoneType.put("Type", "Home");
                    else if(numberType.equals("2"))
                        NamePhoneType.put("Type",  "Mobile");
                    else
                        NamePhoneType.put("Type", "Other");

                    //Then add this map to the list.
                    mPeopleList.add(NamePhoneType);
                }
                phones.close();
            }
        }
        people.close();
    getActivity(). startManagingCursor(people);


    }


    class Task1 extends AsyncTask<Void, Void, String> {

        @Override
        protected void onPreExecute()
        {
            super.onPreExecute();
        }
        @Override
        protected String doInBackground(Void... arg0)
        {
            //Record method
            PopulatePeopleList();



            return "name";
        }

        @Override
        protected void onPostExecute(String result)
        {
            super.onPostExecute(result);

        }
    }

错误：

 AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
        Process: com.reload.reload, PID: 17564
        java.lang.RuntimeException: An error occured while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:304)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
        at java.util.concurrent.FutureTask.run(FutureTask.java:242)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:818)
        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.support.v4.app.FragmentActivity.getContentResolver()' on a null object reference
        at com.reload.reload.activity.MobileFragment.PopulatePeopleList(MobileFragment.java:1034)
        at com.reload.reload.activity.MobileFragment$Task1.doInBackground(MobileFragment.java:1087)
        at com.reloadapp.reload.activity.MobileFragment$Task1.doInBackground(MobileFragment.java:1076)
        at android.os.AsyncTask$2.call(AsyncTask.java:292)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
        at java.lang.Thread.run(Thread.java:818)

Answer 1

我可以看到您正在尝试从getActivity()获取getContentResolver() getActivity() 。 因此，基本上，您的片段未附加到活动中。 这可能在两种情况下发生：

1. 您的活动被破坏了：因此，在调用getContentResolver()之前对getActivity()进行空检查
2. 或者尚未调用片段的onAttach() ：因此，在调用onAttach()之后onAttach()调用该方法。

根据讨论中的评论：

    class Task1 extends AsyncTask<Void, Void, String> {

        private Context context;

        public Task1(Context context){
          this.context = context;
        }

        @Override
        protected void onPreExecute()
        {
            super.onPreExecute();
        }
        @Override
        protected String doInBackground(Void... arg0)
        {
            //Record method
            PopulatePeopleList(context);



            return "name";
        }
    }

现在，您可以在PopulatePeopleList()方法中使用此上下文。

public void PopulatePeopleList(Context context)
{

    mPeopleList.clear();

    Cursor people = context.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
}

希望这对您有所帮助。