Android中使用ContentProvider管理系统资源的实例

contentprovider管理联系人的实例：

package com.android.xiong.getsystemcontentprovidertest; 
 
import java.util.arraylist; 
 
import android.app.activity; 
import android.app.alertdialog; 
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.email; 
import android.provider.contactscontract.commondatakinds.phone; 
import android.provider.contactscontract.commondatakinds.structuredname; 
import android.provider.contactscontract.data; 
import android.provider.contactscontract.rawcontacts; 
import android.view.gravity; 
import android.view.menu; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.view.viewgroup; 
import android.widget.abslistview; 
import android.widget.abslistview.layoutparams; 
import android.widget.baseexpandablelistadapter; 
import android.widget.button; 
import android.widget.edittext; 
import android.widget.expandablelistadapter; 
import android.widget.expandablelistview; 
import android.widget.textview; 
import android.widget.toast; 
 
public class mainactivity extends activity { 
 
  private button bt1, bt2; 
  private expandablelistview exp1; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
    bt1 = (button) findviewbyid(r.id.bt1); 
    bt1.setonclicklistener(new lookpresonclick()); 
    bt2 = (button) findviewbyid(r.id.bt2); 
    bt2.setonclicklistener(new addpersonclick()); 
 
  } 
 
  class addpersonclick implements onclicklistener { 
 
    @override 
    public void onclick(view v) { 
      // 获取程序界面中的桑文本框 
      string name = ((edittext) findviewbyid(r.id.ed1)).gettext() 
          .tostring(); 
      string phone = ((edittext) findviewbyid(r.id.ed2)).gettext() 
          .tostring(); 
      string email = ((edittext) findviewbyid(r.id.ed3)).gettext() 
          .tostring(); 
      // 创建一个空的contentvalue 
      contentvalues values = new contentvalues(); 
      // 向rawcontacts.contnt_uri执行一个空值插入 
      // 目的是获取系统返回的rawcontactid 
      uri rawcontactsuri = getcontentresolver().insert( 
          rawcontacts.content_uri, values); 
      long rawcontactid = contenturis.parseid(rawcontactsuri); 
      values.clear(); 
      values.put(data.raw_contact_id, rawcontactid); 
      // 设置内容类型 
      values.put(data.mimetype, structuredname.content_item_type); 
      // 设置联系人名字 
      values.put(structuredname.given_name, name); 
      // 向联系人uri添加联系人名字 
      getcontentresolver().insert( 
          android.provider.contactscontract.data.content_uri, values); 
      values.clear(); 
      values.put(data.raw_contact_id, rawcontactid); 
      values.put(data.mimetype, phone.content_item_type); 
      // 设置联系人的电话 
      values.put(phone.number, phone); 
      // 设置电话类型 
      values.put(phone.type, phone.type_mobile); 
      // 向联系人电话uri添加电话号码 
      getcontentresolver().insert( 
          android.provider.contactscontract.data.content_uri, values); 
      values.clear(); 
      values.put(data.raw_contact_id, rawcontactid); 
      values.put(data.mimetype, email.content_item_type); 
      // 设置联系人的email地址 
      values.put(email.data, email); 
      // 设置email的类型 
      values.put(email.type, email.type_work); 
      getcontentresolver().insert( 
          android.provider.contactscontract.data.content_uri, values); 
      toast.maketext(mainactivity.this, "添加联系人信息成功", toast.length_long) 
          .show(); 
 
    } 
 
  } 
 
  class lookpresonclick implements onclicklistener { 
 
    @override 
    public void onclick(view v) { 
      // 定义两个list来封装系统联系人信息，指定联系人的电话，email等详情 
      final arraylist<string> names = new arraylist<string>(); 
      final arraylist<arraylist<string>> details = new arraylist<arraylist<string>>(); 
      // 使用contentresolver查找联系人数据 
      cursor cursor = getcontentresolver().query( 
          contactscontract.contacts.content_uri, null, null, null, 
          null); 
      // 遍历结果 获取系统所有联系人信息 
      while (cursor.movetonext()) { 
        // 获取联系人id 
        string contactid = cursor.getstring(cursor 
            .getcolumnindex(contactscontract.contacts._id)); 
        // 获取联系人的名字 
        string name = cursor 
            .getstring(cursor 
                .getcolumnindex(contactscontract.contacts.display_name)); 
        names.add(name); 
        // 使用contentresolver查找联系人的电话号码 
        cursor phones = getcontentresolver().query( 
            contactscontract.commondatakinds.phone.content_uri, 
            null, 
            contactscontract.commondatakinds.phone.contact_id 
                + "= ?", new string[] { contactid }, null); 
        arraylist<string> detail = new arraylist<string>(); 
        // 遍历查询结果，获取该联系人的多个电话 
        while (phones.movetonext()) { 
          // 获取查询的结果中的电话号码列 
          string phonenumber = phones 
              .getstring(phones 
                  .getcolumnindex(contactscontract.commondatakinds.phone.number)); 
          detail.add("电话号码是：" + phonenumber); 
        } 
        phones.close(); 
        // 使用contentresolver查找联系人的e-mail地址 
        cursor emails = getcontentresolver().query( 
            contactscontract.commondatakinds.email.content_uri, 
            null, 
            contactscontract.commondatakinds.email.contact_id 
                + " =?", new string[] { contactid }, null); 
        // 遍历查询结果，获取该联系人的多个email地址 
        while (emails.movetonext()) { 
          // 获取查询的结果中email地址中列的数据 
          string emailaddress = emails 
              .getstring(emails 
                  .getcolumnindex(contactscontract.commondatakinds.email.data)); 
          detail.add("email是:" + emailaddress); 
        } 
        emails.close(); 
        details.add(detail); 
 
      } 
      cursor.close(); 
 
      // 加载result.xml界面布局代表的视图 
      view resultdialog = getlayoutinflater().inflate(r.layout.result, 
          null); 
      exp1 = (expandablelistview) resultdialog.findviewbyid(r.id.exp1); 
      // 创建一个expandablelistadapter对象 
      expandablelistadapter adapter = new baseexpandablelistadapter() { 
 
        @override 
        public boolean ischildselectable(int groupposition, 
            int childposition) { 
          // todo auto-generated method stub 
          return true; 
        } 
 
        @override 
        public boolean hasstableids() { 
          // todo auto-generated method stub 
          return true; 
        } 
 
        @override 
        public view getgroupview(int groupposition, boolean isexpanded, 
            view convertview, viewgroup parent) { 
          textview text = gettextveiw(); 
          text.settext(getgroup(groupposition).tostring()); 
          return text; 
        } 
 
        @override 
        public long getgroupid(int groupposition) { 
          // todo auto-generated method stub 
          return groupposition; 
        } 
 
        @override 
        public int getgroupcount() { 
          // todo auto-generated method stub 
          return names.size(); 
        } 
 
        @override 
        public object getgroup(int groupposition) { 
          // todo auto-generated method stub 
          return names.get(groupposition); 
        } 
 
        @override 
        public int getchildrencount(int groupposition) { 
          // todo auto-generated method stub 
          return details.get(groupposition).size(); 
        } 
 
        private textview gettextveiw() { 
          abslistview.layoutparams lp = new layoutparams( 
              viewgroup.layoutparams.match_parent, 64); 
          textview textview = new textview(mainactivity.this); 
          textview.setlayoutparams(lp); 
          textview.setgravity(gravity.center_vertical | gravity.left); 
          textview.setpadding(36, 0, 0, 0); 
          textview.settextsize(20); 
          return textview; 
        } 
 
        @override 
        public view getchildview(int groupposition, int childposition, 
            boolean islastchild, view convertview, viewgroup parent) { 
          textview textview = gettextveiw(); 
          textview.settext(getchild(groupposition, childposition) 
              .tostring()); 
 
          return textview; 
        } 
 
        @override 
        public long getchildid(int groupposition, int childposition) { 
          // todo auto-generated method stub 
          return childposition; 
        } 
 
        @override 
        public object getchild(int groupposition, int childposition) { 
          return details.get(groupposition).get(childposition); 
        } 
      }; 
      exp1.setadapter(adapter); 
      // 使用对话框来显示查询结果 
      new alertdialog.builder(mainactivity.this).setview(resultdialog) 
          .setpositivebutton("确定", null).show(); 
    } 
 
  } 
 
  @override 
  public boolean oncreateoptionsmenu(menu menu) { 
    // inflate the menu; this adds items to the action bar if it is present. 
    getmenuinflater().inflate(r.menu.main, menu); 
    return true; 
  } 
 
} 

<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" 
  android:orientation="vertical" 
  tools:context=".mainactivity" > 
 
    <edittext  
    android:id="@+id/ed1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:hint="输入联系人姓名"/> 
    <edittext  
      android:id="@+id/ed2" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:hint="输入联系人电话"/> 
    <edittext  
      android:id="@+id/ed3" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:hint="输入联系人email"/> 
    <button  
      android:id="@+id/bt2" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="添加联系人信息"/> 
  <button 
    android:id="@+id/bt1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="查看联系人" /> 
 
 
</linearlayout> 

<?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" > 
   
 
  <expandablelistview 
    android:id="@+id/exp1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" > 
  </expandablelistview> 
</linearlayout> 

使用contentprovider管理多媒体内容
android为多媒体提供的uri:
1、mediastore.audio.mdia.external_content_uri：存储在外部设备上的音频文件
2、mediastore.audio.mdia.internal_content_uri：存储在手机内部上的音频文件
3、mediastore.images.mdia.external_content_uri：存储在外部设备上的图片文件
4、mediastore.images.mdia.internal_content_uri：存储在内部设备上的图片文件
5、mediastore.video.mdia.external_content_uri：存储在外部设备上的音频文件
6、mediastore.video.mdia.internal_content_uri：存储在内部设备上的音频文件
实例：

package com.example.mediaprovidertest; 
 
import java.io.ioexception; 
import java.io.outputstream; 
import java.util.arraylist; 
import java.util.hashmap; 
import java.util.list; 
import java.util.map; 
 
import android.app.activity; 
import android.app.alertdialog; 
import android.content.contentvalues; 
import android.database.cursor; 
import android.graphics.bitmap; 
import android.graphics.bitmapfactory; 
import android.net.uri; 
import android.os.bundle; 
import android.provider.mediastore.images.media; 
import android.view.menu; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.widget.adapterview; 
import android.widget.adapterview.onitemclicklistener; 
import android.widget.button; 
import android.widget.imageview; 
import android.widget.listview; 
import android.widget.simpleadapter; 
import android.widget.textview; 
 
public class mainactivity extends activity { 
 
  private button bt1, bt2; 
  private listview list1; 
 
  arraylist<string> names = new arraylist<string>(); 
  arraylist<string> descs = new arraylist<string>(); 
  arraylist<string> filenames = new arraylist<string>(); 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
    bt1 = (button) findviewbyid(r.id.bt1); 
    bt2 = (button) findviewbyid(r.id.bt2); 
    list1 = (listview) findviewbyid(r.id.list); 
 
    bt1.setonclicklistener(new onclicklistener() { 
 
      @override 
      public void onclick(view v) { 
        // 清空names、desc、filename集合里原有的数据 
        names.clear(); 
        descs.clear(); 
        filenames.clear(); 
        // 通过contentresolver查询所有图片信息 
        cursor curos = getcontentresolver().query( 
            media.external_content_uri, null, null, null, null); 
        while (curos.movetonext()) { 
          // 获取图片显示的名字 
          string name = curos.getstring(curos 
              .getcolumnindex(media.display_name)); 
          // 获取图片的详细信息、 
          string desc = curos.getstring(curos 
              .getcolumnindex(media.description)); 
          // 将图片名保存的位置数据 
          byte[] data = curos.getblob(curos 
              .getcolumnindex(media.data)); 
          // 将图片名添加到names集合中 
          names.add(name); 
          // 将图片描述添加到desc集合中 
          descs.add(desc); 
          // 将图片保存路径添加到filenames集合中 
          filenames.add(new string(data, 0, data.length - 1)); 
        } 
        // 创建一个list集合的元素是map 
        list<map<string, object>> listitems = new arraylist<map<string, object>>(); 
        // 将names、descs两个集合对象的数据转换到map集合 
        for (int i = 0; i < names.size(); i++) { 
          map<string, object> listitem = new hashmap<string, object>(); 
          listitem.put("name", names.get(i)); 
          listitem.put("desc", descs.get(i)); 
          listitems.add(listitem); 
        } 
        simpleadapter simple = new simpleadapter(mainactivity.this, 
            listitems, r.layout.items, new string[] { "name", 
                "desc" }, new int[] { r.id.txt1, r.id.txt2 }); 
        list1.setadapter(simple); 
 
      } 
    }); 
    list1.setonitemclicklistener(new onitemclicklistener() { 
 
      @override 
      public void onitemclick(adapterview<?> arg0, view arg1, int arg2, 
          long arg3) { 
        // 加载view.xml界面布局代表视图 
        view view = getlayoutinflater().inflate(r.layout.view, null); 
        // 获取viewdialog中imageview组件 
        imageview image1 = (imageview) view.findviewbyid(r.id.image1); 
        // 设置image显示指定的图片 
        image1.setimagebitmap(bitmapfactory.decodefile(filenames 
            .get(arg2))); 
        // 使用对话框显示用户单击的图片 
        new alertdialog.builder(mainactivity.this).setview(view) 
            .setpositivebutton("确定", null).show(); 
 
      } 
    }); 
    bt2.setonclicklistener(new onclicklistener() { 
 
      @override 
      public void onclick(view v) { 
        // 创建contentvalues对象，准备插入数据 
        contentvalues values = new contentvalues(); 
        values.put(media.display_name, "jinta"); 
        values.put(media.description, "金塔"); 
        values.put(media.mime_type, "image/jpeg"); 
        // 插入数据对应的uri 
        uri uri = getcontentresolver().insert( 
            media.external_content_uri, values); 
        // 加载应用程序下的jinta图片 
        bitmap bitmap = bitmapfactory.decoderesource( 
            mainactivity.this.getresources(), r.drawable.jinta); 
        outputstream os = null; 
        try { 
          // 获取刚插入的数据的uri对应的输出流 
          os = getcontentresolver().openoutputstream(uri); 
          // 将bitmap图片保存到uri对应的数据节点中 
          bitmap.compress(bitmap.compressformat.jpeg, 100, os); 
          os.close(); 
        } catch (ioexception io) { 
          io.printstacktrace(); 
        } 
      } 
    }); 
  } 
 
  @override 
  public boolean oncreateoptionsmenu(menu menu) { 
    // inflate the menu; this adds items to the action bar if it is present. 
    getmenuinflater().inflate(r.menu.main, menu); 
    return true; 
  } 
 
} 

<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" 
  android:orientation="vertical" 
  tools:context=".mainactivity" > 
   
  <button  
    android:id="@+id/bt1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="查看图片"/> 
  <button  
    android:id="@+id/bt2" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="添加图片"/> 
  <listview  
    android:id="@+id/list" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"></listview> 
 
 
 
</linearlayout> 

<?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" > 
  <textview  
    android:id="@+id/txt1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"/> 
  <textview  
    android:id="@+id/txt2" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"/> 
   
 
</linearlayout> 

<?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" > 
 
    <imageview 
      android:id="@+id/image1" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" /> 
 
</linearlayout>