android学习笔记54——ContentProvider

布局文件main.xml==>
<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/btnQuery"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查询" />

</LinearLayout>

result.xml==>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ExpandableListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ffffff"
        android:cacheColorHint="#00000000"
        android:listSelector="#00000000" >
    </ExpandableListView>

</LinearLayout>

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

代码实现==》
package com.example.myprovidercontent1;

import java.util.ArrayList;

import android.os.Bundle;
import android.provider.ContactsContract;
import android.app.Activity;
import android.app.AlertDialog;
import android.database.Cursor;
import android.database.DataSetObserver;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AbsListView;
import android.widget.AbsListView.LayoutParams;
import android.widget.Button;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;

public class MainActivity extends Activity
{
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		Button btnQuery = (Button) this.findViewById(R.id.btnQuery);
		btnQuery.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View v)
			{
				query(v);
			}
		});
	}

	private void query(View v)
	{
		// 定义两个List封装系统联系人信息、指定联系人的电话号码、Email等...
		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 = this.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
				null, null, null, null);
		// 遍历查询结果，获取系统中所有联系人
		while (cursor.moveToNext())
		{
			// 联系人Id、名称
			String contactId = cursor.getString(cursor
					.getColumnIndex(ContactsContract.Contacts._ID));
			String name = cursor.getString(cursor
					.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
			names.add(name);
			Log.i("swg", "name：" + name);
			// 联系人电话号码
			Cursor phones = this.getContentResolver()
					.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
							ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactId,
							null, null);
			final ArrayList<String> detail = new ArrayList<String>();
			// 遍历查询结果，获取该联系人的多个 电话号码
			while (phones.moveToNext())
			{
				String phoneNum = phones.getString(phones
						.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
				Log.i("swg", "电话号码：" + phoneNum);
				detail.add("电话号码：" + phoneNum);
			}
			phones.close();

			// 使用ContentResolver查询联系人Email
			Cursor emails = this.getContentResolver()
					.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, null,
							ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=" + contactId,
							null, null);
			// 遍历查询结果，获取该联系人的多个Email地址
			while (emails.moveToNext())
			{
				String emailAdd = emails.getString(emails
						.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));

				Log.i("swg", "邮件地址：" + emailAdd);
				detail.add("邮件地址：" + emailAdd);
			}
			emails.close();

			details.add(detail);
		}
		cursor.close();

		// 加载result.xml界面布局文件
		View resultDialog = this.getLayoutInflater().inflate(R.layout.result, null);
		ExpandableListView list = (ExpandableListView) resultDialog.findViewById(R.id.list);
		// 创建一个ExpandableListAdapter对象
		ExpandableListAdapter adapter = new ExpandableListAdapter()
		{
			@Override
			public void unregisterDataSetObserver(DataSetObserver observer)
			{
			}

			@Override
			public void registerDataSetObserver(DataSetObserver observer)
			{
			}

			@Override
			public void onGroupExpanded(int groupPosition)
			{
			}

			@Override
			public void onGroupCollapsed(int groupPosition)
			{
			}

			@Override
			public boolean isEmpty()
			{
				return false;
			}

			@Override
			public boolean isChildSelectable(int groupPosition, int childPosition)
			{
				return true;
			}

			@Override
			public boolean hasStableIds()
			{
				return true;
			}

			// 该方法决定每个组选项的外观
			@Override
			public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
					ViewGroup parent)
			{
				TextView tv = getTextView();
				tv.setText(getGroup(groupPosition).toString());
				return tv;
			}

			@Override
			public long getGroupId(int groupPosition)
			{
				return groupPosition;
			}

			@Override
			public int getGroupCount()
			{
				// details
				return names.size();
			}

			@Override
			public Object getGroup(int groupPosition)
			{
				// details
				return names.get(groupPosition);
			}

			@Override
			public long getCombinedGroupId(long groupId)
			{
				return 0;
			}

			@Override
			public long getCombinedChildId(long groupId, long childId)
			{
				return 0;
			}

			@Override
			public int getChildrenCount(int groupPosition)
			{
				return details.get(groupPosition).size();
			}

			private TextView getTextView()
			{
				AbsListView.LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
						64);
				TextView tv = new TextView(MainActivity.this);
				tv.setLayoutParams(lp);
				tv.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.LEFT);
				tv.setPadding(36, 0, 0, 0);
				tv.setTextSize(20);
				return tv;
			}

			// 该方法决定每个子项的外观
			@Override
			public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
					View convertView, ViewGroup parent)
			{
				TextView tv = getTextView();
				tv.setText(getChild(groupPosition, childPosition).toString());
				return tv;
			}

			@Override
			public long getChildId(int groupPosition, int childPosition)
			{
				return childPosition;
			}

			@Override
			public Object getChild(int groupPosition, int childPosition)
			{
				return details.get(groupPosition).get(childPosition);
			}

			@Override
			public boolean areAllItemsEnabled()
			{
				return false;
			}
		};
		// 为ExpandableListView设置Adapter
		list.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();
	}
}