android开发之内容提供者

MobSec

一个获取手机联系人小Demo
布局文件如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.cn.yllen.contentprovider.MainActivity">
    <ListView
        android:id="@+id/conent_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</LinearLayout>

加入权限申明

<uses-permission android:name="android.permission.READ_CONTACTS" ></uses-permission>

实现代码如下

import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class MainActivity extends AppCompatActivity {
    List<String> contactsList = new ArrayList<>();
    ArrayAdapter<String> adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView view = (ListView) findViewById(R.id.conent_view);
        adapter = new ArrayAdapter(this,android.R.layout.simple_expandable_list_item_1,contactsList);
        view.setAdapter(adapter);
        readContacts();
    }
    private void readContacts()
    {
        Cursor cursor = null;
        try
        {
            cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
            if (cursor != null)
            {
                while(cursor.moveToNext())
                {
                    //联系人
                    String displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    //手机号
                    String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    contactsList.add(displayName + "\n" + number);
                }
                adapter.notifyDataSetChanged();
            }
        }catch (Exception e)
        {
            e.printStackTrace();
        }finally {
            if (cursor != null)
                cursor.close();
        }
    }
}