android - 在android中获取联系人非常慢

Question

我编写了一个代码来从联系人中获取联系人姓名、电话号码和图像，并将其显示在 android 的 ListView 中。它工作正常，但需要更多时间来加载。我曾尝试在代码的某些部分使用多线程。但是加载时间并没有减少。

这是 onCreate() 方法:

protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 lvDetail = (ListView) findViewById(R.id.listView1);

 fetchcontacts();

 lvDetail.setAdapter(new MyBaseAdapter(context, myList));
 }

这是获取联系人的代码:

  private void fetchcontacts() {

        // TODO Auto-generated method stub
        Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null,
                null, null, ContactsContract.Contacts.DISPLAY_NAME + " ASC");
                int count = cursor.getCount();
                if (count > 0) {
                     Toast.makeText(context, "count >0", Toast.LENGTH_SHORT).show();
                    while (cursor.moveToNext()) {
                        String columnId = ContactsContract.Contacts._ID;
                        int cursorIndex = cursor.getColumnIndex(columnId);
                        String id = cursor.getString(cursorIndex);

                      name = cursor.getString(cursor
                .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));


                      Toast.makeText(context, "Toast 1", Toast.LENGTH_SHORT).show();




                        int numCount = Integer.parseInt(cursor.getString(cursor
                            .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)));
                        if (numCount > 0) {
                             Toast.makeText(context, "Toast 2", Toast.LENGTH_SHORT).show();
                            Cursor phoneCursor = getContentResolver().query(
                ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,
                                CommonDataKinds.Phone.CONTACT_ID+" = ?", new String[] { id
                }, ContactsContract.Contacts.DISPLAY_NAME + " ASC");

                                while (phoneCursor.moveToNext()) {
                                     Toast.makeText(context, "Toast 3", Toast.LENGTH_SHORT).show();
                              phoneNo = phoneCursor.getString(phoneCursor
                .getColumnIndex(ContactsContract.CommonDataKinds.
                Phone.NUMBER));


                                String image_uri = phoneCursor
                                         .getString(phoneCursor
                                         .getColumnIndex(ContactsContract.CommonDataKinds.Phone.PHOTO_URI));

                             if (image_uri != null) {
                                 Toast.makeText(context, "Toast 4", Toast.LENGTH_SHORT).show();
                                 System.out.println(Uri.parse(image_uri));
                                 try {
                              bitmap = MediaStore.Images.Media
                                 .getBitmap(this.getContentResolver(),
                                 Uri.parse(image_uri));
                                // sb.append("\n Image in Bitmap:" + bitmap);
                                // System.out.println(bitmap);

                                 } catch (FileNotFoundException e) {
                                 // TODO Auto-generated catch block
                                 e.printStackTrace();
                                 } catch (IOException e) {
                                 // TODO Auto-generated catch block
                                 e.printStackTrace();
                                 }

                                 }
                             Toast.makeText(context, name, Toast.LENGTH_SHORT).show();

                                    getDataInList(name,phoneNo,bitmap);
                                 name=null;
                                 phoneNo=null;
                                 Drawable myDrawable = getResources().getDrawable(R.drawable.star1);
                                 bitmap = ((BitmapDrawable) myDrawable).getBitmap();



                                    }
                                    phoneCursor.close();
                                }

                            }


                        }

此处， ListView 的 setAdapter() 函数在将所有联系人提取到 ArrayList 后开始工作。有没有人知道如何在获取联系人时显示联系人？有示例代码吗？

Answer 1

1.从您需要的Cursor读取列，根据您的要求，您只需要_ID,HAS_PHONE_NUMBER,DISPLAY_NAME，所以改变光标读数

Cursor cursor = getContentResolver().query(
            ContactsContract.Contacts.CONTENT_URI,
            new String[] { ContactsContract.Contacts._ID,
                    ContactsContract.Contacts.HAS_PHONE_NUMBER,
                    ContactsContract.Contacts.DISPLAY_NAME }, null, null,
            ContactsContract.Contacts.DISPLAY_NAME + " ASC");

2.不要在 UI 线程中执行耗时过程..改用 AsyncTask

注意 : 这两个步骤会在一定程度上解决..但不完全