android - 如何从手机中获取所有联系人并在 android 中单击按钮时显示在 ListView 中？

Question

我想从手机中获取所有联系人并简单地显示在 android ListView 中，而不存储在数据库中，目的是当用户单击“同步所有联系人”按钮时，应获取所有联系人并显示在 ListView 中。这是主要的 Activity 类，我还创建了带有变量 contacts_name 和 phone_no 以及 CustomAdapterclass

的 getter-setter 类

public class MainActivity extends AppCompatActivity {

ListView listView;
Button sync;



ArrayList<newlist> listitem;

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

    listitem = new ArrayList<newlist>();
    listView = (ListView) findViewById(R.id.listViewID);
    registerForContextMenu(listView);

    sync= (Button) findViewById(R.id.syncID);
    sync.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

              //what method will be used here for sync contacts and display in listview
           }
       });
   }
}

如有任何帮助，我们将不胜感激。

Answer 1

尝试使用这个库，您可以轻松获取所有联系人。

https://github.com/EverythingMe/easy-content-providers

对于ListView，你需要写一个自定义适配器，你也可以在网上找到很多例子。这只是一个示例。

public class CustomListViewAdapter extends ArrayAdapter<Person> {

private final LayoutInflater inflater;
private final Context context;
private ViewHolder holder;
private final ArrayList<Person> persons;

public CustomListViewAdapter(Context context, ArrayList<Person> persons) {
    super(context,0, persons);
    this.context = context;
    this.persons = persons;
    inflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
    return persons.size();
}

@Override
public Person getItem(int position) {
    return persons.get(position);
}

@Override
public long getItemId(int position) {
    return persons.get(position).hashCode();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {

        convertView = inflater.inflate(R.layout.list_view_item, null);

        holder = new ViewHolder();
        holder.personImage = (ImageView) convertView.findViewById(R.id.person_image);
        holder.personNameLabel = (TextView) convertView.findViewById(R.id.person_name_label);
        holder.personAddressLabel = (TextView) convertView.findViewById(R.id.person_address_label);
        convertView.setTag(holder);

    }
    else{
        //Get viewholder we already created
        holder = (ViewHolder)convertView.getTag();
    }

    Person person = persons.get(position);
    if(person != null){
        holder.personImage.setImageResource(person.getPhotoId());
        holder.personNameLabel.setText(person.getName());
        holder.personAddressLabel.setText(person.getAddress());

    }
    return convertView;
}

//View Holder Pattern for better performance
private static class ViewHolder {
    TextView personNameLabel;
    TextView personAddressLabel;
    ImageView personImage;

}
} 

在 onCreate 中阅读库的文档并尝试弄清楚如何获取联系人。

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

    // GET CONTACTS DATA
    initialize();
}

private void initialize() {
    persons = new ArrayList<Person>();
    listView = (ListView) findViewById(R.id.person_list_view);
    listViewAdapter = new CustomListViewAdapter(MainActivity.this,persons);
    listView.setAdapter(listViewAdapter);
}