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>