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 names = new ArrayList(); 
      final ArrayList> details = new ArrayList>(); 
      // 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 detail = new ArrayList(); 
 // 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; 
  } 
 
} 

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 names = new ArrayList(); 
  ArrayList descs = new ArrayList(); 
  ArrayList filenames = new ArrayList(); 
 
  @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> listitems = new ArrayList>(); 
 // 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 listitem = new HashMap(); 
   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; 
  } 
 
}