ContentProvider 数据供应器_联系人增删查改操作

ContentProvider 有 4 中基本的操作：查询（query）、插入（insert）、更新（update）、删除（delete），都可以通过其助手 ContentResolver 实现。ContentResolver 对象可以通过 Context 对象的 getContentResolver() 方法获取。

    public void queryData(){
        
        String fields[]={ContactsContract.Contacts._ID,
                ContactsContract.Contacts.DISPLAY_NAME,
                ContactsContract.Contacts.Data.DATA1
            };
        String q_id = et_queryId.getText().toString();
        Log.i("Tag", "id=" + q_id);
        int n = 0;
        
        if(q_id != null && q_id.length()<3){
            try {
                n = Integer.parseInt(q_id);
                cursor = cr.query(contactsUri, fields, "_id=?",new String[]{q_id}, null);
            } catch (NumberFormatException e) {
                Toast.makeText(this, "ID错误或未指定！", Toast.LENGTH_SHORT).show();
                n = 0;
            }
        }
        
        if(n == 0){
            cursor = cr.query(contactsUri, fields,null,null, null);
            Log.i("Tag", "查询所有联系人 ！");
        }
        Log.i("Tag", "共有联系人： " + cursor.getCount());
        
        // 填充 ListView
        if(cursor != null){
            SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.listview_item,
                    cursor,fields,new int[]{R.id.listview_item_id,R.id.listview_item_name,R.id.listview_item_phone});
            lv.setAdapter(sca);
        }
    }

fields 数组是欲查询字段信息，其值都是引用联系人对象 Contents 的属性。q_id 变量是当用户指定 ID 查询时，输入的 ID值。当输入 ID 进行条件查询时，需要将条件传入，查询的结果会返回 Cursor 对象，直接构造 SimpleCursorAdapter 数据适配器，设置给 ListView 显示查询结果。 

添加权限

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

import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.CommonDataKinds.StructuredName;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Data;
import android.provider.ContactsContract.RawContacts;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
    
    Button bt_query,bt_insert,bt_update,bt_del;
    EditText et_queryId,et_insertName,et_insertPhone,et_updateId,et_updatePhone,et_delId;
    ListView lv;
    
    ContentResolver cr;
    Uri contactsUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
    Cursor cursor;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.main);
        bt_query = (Button) findViewById(R.id.search);
        bt_insert = (Button) findViewById(R.id.insert);
        bt_update = (Button) findViewById(R.id.update);
        bt_del = (Button) findViewById(R.id.delete);
        MyListener ml = new MyListener();
        bt_query.setOnClickListener(ml);
        bt_insert.setOnClickListener(ml);
        bt_update.setOnClickListener(ml);
        bt_del.setOnClickListener(ml);
        et_queryId = (EditText) findViewById(R.id.searchID);
        et_insertName = (EditText) findViewById(R.id.insertName);
        et_insertPhone = (EditText) findViewById(R.id.insertPhone);
        et_updateId = (EditText) findViewById(R.id.updateID);
        et_updatePhone = (EditText) findViewById(R.id.updatePhone);
        et_delId = (EditText) findViewById(R.id.deleteID);
        lv = (ListView) findViewById(R.id.lv);
        
        cr = getContentResolver();
    }
    
    public void queryData(){
        
        String fields[]={ContactsContract.Contacts._ID,
                ContactsContract.Contacts.DISPLAY_NAME,
                ContactsContract.Contacts.Data.DATA1
            };
        String q_id = et_queryId.getText().toString();
        Log.i("Tag", "id=" + q_id);
        int n = 0;
        
        if(q_id != null && q_id.length()<3){
            try {
                n = Integer.parseInt(q_id);
                cursor = cr.query(contactsUri, fields, "_id=?",new String[]{q_id}, null);
            } catch (NumberFormatException e) {
                Toast.makeText(this, "ID错误或未指定！", Toast.LENGTH_SHORT).show();
                n = 0;
            }
        }
        
        if(n == 0){
            cursor = cr.query(contactsUri, fields,null,null, null);
            Log.i("Tag", "查询所有联系人 ！");
        }
        Log.i("Tag", "共有联系人： " + cursor.getCount());
        
        // 填充 ListView
        if(cursor != null){
            SimpleCursorAdapter sca = new SimpleCursorAdapter(
                    this,
                    R.layout.listview_item,
                    cursor,
                    fields,
                    new int[]{R.id.listview_item_id,R.id.listview_item_name,R.id.listview_item_phone});
            lv.setAdapter(sca);
        }
    }
    
    public void insertData(){
        
        String name = et_insertName.getText().toString();
        String phone = et_insertPhone.getText().toString();
        if(name == null || name.length()<0)    return;
        ContentValues cv = new ContentValues();
        
        // 插入新的联系人，需要 ContactID，采用下面办法获取
        Uri rawUri = cr.insert(RawContacts.CONTENT_URI, cv);
        long contactID = ContentUris.parseId(rawUri);    //获取ID
        
        // 插入联系人要分步完成
        // step 1 插入姓名
        cv.clear();
        cv.put(Data.RAW_CONTACT_ID, contactID);
        cv.put(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE);
        cv.put(StructuredName.GIVEN_NAME, name);    //联系人姓名
        cr.insert(Data.CONTENT_URI, cv);    //执行插入
        Log.i("Tag", "插入姓名完成");
        
        // step 2 插入号码
        cv.clear();
        cv.put(Data.RAW_CONTACT_ID, contactID);
        cv.put(Data.MIMETYPE , Phone.CONTENT_ITEM_TYPE);
        cv.put(Phone.NUMBER, phone);    //电话号码
        cv.put(Phone.TYPE, Phone.TYPE_MOBILE);    //号码类型，移动电话
        cr.insert(Data.CONTENT_URI, cv);    //执行插入
        Log.i("Tag", "插入号码完成");
        
        // 如果后面还有邮箱等其他信息，则需要另作插入操作
    }
    
    public void updateData(){
        
        String updateID = et_updateId.getText().toString();
        String updatePhone = et_updatePhone.getText().toString();
        if(updateID == null || updateID.length()<1)    return;
        
        ContentValues cv = new ContentValues();
        cv.put(Phone.NUMBER, updatePhone);
        int n = cr.update(Data.CONTENT_URI, cv, "_ID=?", new String[]{updateID});
        Log.i("Tag", "更新记录条数 " + n);
    }
    
    public void delData(){
        
        String delID = et_delId.getText().toString();
        if(delID == null || delID.length()<1)    return;
        
        int n = cr.delete(Data.CONTENT_URI, "_ID=?", new String[]{delID});
        Log.i("Tag", "删除记录 条数：" + n);
    }
    
    class MyListener implements OnClickListener{
        
        @Override
        public void onClick(View v) {
            
            switch(v.getId()){
            case R.id.search:
                queryData();
                break;
            case R.id.update:
                updateData();
                break;
            case R.id.insert:
                insertData();
                break;
            case R.id.delete:
                delData();
                break;
            }
        }
    }
}

 主界面布局文件

<?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" >
    
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <Button 
            android:id="@+id/search"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="查询"
            />
        <EditText 
            android:id="@+id/searchID"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="不指定id将查询所有联系人"
            />
    </LinearLayout>
    
    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <Button 
            android:id="@+id/insert"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="插入"
            />
        <EditText 
            android:id="@+id/insertName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="姓名"
            />
        <EditText 
            android:id="@+id/insertPhone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="号码"
            />
    </LinearLayout>
    
    <LinearLayout
        android:id="@+id/linearLayout3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <Button 
            android:id="@+id/update"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="更新"
            />
        <EditText 
            android:id="@+id/updateID"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="待更ID"
            />
        <EditText 
            android:id="@+id/updatePhone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="新号码"
            />
    </LinearLayout>
    
    <LinearLayout
        android:id="@+id/linearLayout4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <Button 
            android:id="@+id/delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="删除"
            />
        <EditText 
            android:id="@+id/deleteID"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="待删除ID"
            />
    </LinearLayout>
    
    <ListView android:id="@+id/lv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        ></ListView>
    
</LinearLayout>

ListView 布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" 
        >
        <TextView
            android:id="@+id/listview_item_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="" />

        <TextView
            android:id="@+id/listview_item_name"
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text=""
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <TextView
            android:id="@+id/listview_item_phone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium" />
        
    </LinearLayout>

</LinearLayout>