Apidemos-->Views-Lists-Cursor(people)学�

2022-11-22 12:50:07

Apidemos-->Views-Lists-Cursor(people)-主要用到了获取手机联系人信息,属于内容提供者的范畴,要想了解这方面的内容,能够參考官方docs

/sdk/docs/guide/topics/providers/content-provider-basics.html

这里简单说下contentprovider;

contentprovider可实现不同应用程序之间的数据共享. 它是程序之间进行数据交换的api.

当一个程序须要把自己的数据暴露给其它程序使用时,该应用程序就能够通过提供contentprovider来实现,其它应用程序也能够通过来contentResolver操作contentprovider暴露的数据.

实例中用到了系统提供的联系人contentprovider:

经常使用的几个Uri有:

ContactsContract.Contacts.CONTENT_URL //管理联系人的URI

ContactsContract.Contacts.＿ID／／联系人Id

ContactsContract.Contacts.DISPLAY_NAME //联系人name 的Uri

ContactsContract.CommonDataKinds.Phone.CONTENT_URI 管理联系的电话的URI

ContactsContract.CommonDataKinds.Email.CONTENT_URI 管理联系人的E-mail的URI

随便写下自己犯了一个超级低级的错误就是.

竟然採用for来遍历cursor,把 moveToNext丢了. 还有使用完关闭游标,加上mCursor.close();

package com.example.testmyviewslistscursorpeople;

import java.util.ArrayList;

import java.util.List;

import android.app.ListActivity;

import android.content.Context;

import android.database.Cursor;

import android.net.LocalSocketAddress.Namespace;

import android.os.Bundle;

import android.provider.ContactsContract.Contacts;

import android.provider.ContactsContract.CommonDataKinds.Phone;

import android.text.GetChars;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import com.example.testmyviewslistsactivateitems.R;

/**

 *

 * @author Administrator 仿效果slow loading apiDemos -- Views -Lists - Slow Adapter

 */

public class Main extends ListActivity {

	private boolean mBusy = false;

	public static List<String> mStrings = new ArrayList<String>();

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		getPeople();

		setListAdapter(new SlowAdapter(this));

		// 设置选择模式为单选

		getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);

		// 首次载入设置选中items

		getListView().setItemChecked(0, true);

		getListView().setOnScrollListener(new OnScrollListener());

	}

	protected class OnScrollListener implements ListView.OnScrollListener {

		@Override

		public void onScrollStateChanged(AbsListView view, int scrollState) {

			switch (scrollState) {

			// The view is not scrolling.

			case OnScrollListener.SCROLL_STATE_IDLE:

				mBusy = false;

				int first = view.getFirstVisiblePosition();

				int count = view.getChildCount();

				for (int i = 0; i < count; i++) {

					TextView t = (TextView) view.getChildAt(i);

					if (t.getTag() != null) {

						t.setText(mStrings.get(first + i));

						t.setTag(null);

					}

				}

				break;

			// The user is scrolling using touch, and their finger is still on

			// the screen

			case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:

				mBusy = true;

				break;

			// The user had previously been scrolling using touch and had

			// performed a fling.

			// The animation is now coasting to a stop

			case OnScrollListener.SCROLL_STATE_FLING:

				mBusy = true;

				break;

			}

		}

		@Override

		public void onScroll(AbsListView view, int firstVisibleItem,

				int visibleItemCount, int totalItemCount) {

		}

	}

	@Override

	protected void onListItemClick(ListView l, View v, int position, long id) {

		getListView().setItemChecked(position, true);

	}

	// 自己定义适配器

	private class SlowAdapter extends BaseAdapter {

		private LayoutInflater mInflater;

		public SlowAdapter(Context context) {

			mInflater = (LayoutInflater) context

					.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		}

		@Override

		public int getCount() {

			return mStrings.size();

		}

		@Override

		public Object getItem(int position) {

			return position;

		}

		@Override

		public long getItemId(int position) {

			return position;

		}

		@Override

		public View getView(int position, View convertView, ViewGroup parent) {

			TextView text;

			if (convertView == null) {

				text = (TextView) mInflater.inflate(R.layout.main, null, false);

			} else {

				text = (TextView) convertView;

			}

			if (!mBusy) {

				text.setText(mStrings.get(position).toString());

				text.setTag(null);

			} else {

				text.setText("Loading...");

				text.setTag(this);

			}

			return text;

		}

	}

	protected  void  getPeople() {

		final String[] CONTACT_PROJECTION = new String[] { Contacts._ID,

				Contacts.DISPLAY_NAME, };

		Cursor mCursor = getContentResolver().query(Contacts.CONTENT_URI,

				CONTACT_PROJECTION, null, null, null);

		 while(mCursor.moveToNext()) {

		   String name =

		   mCursor.getString(mCursor.getColumnIndex(Contacts.DISPLAY_NAME));

		   mStrings.add(name);

		 }

                mCursor.close();

	}

}

实例源代码

添加�获取手机联系人电话的方法(仅仅为了解获取方法,尚未和联系人一一相应,兴许将改进):

	protected void getPeople() {

		final String[] CONTACT_PROJECTION = new String[] { Contacts._ID,

				Contacts.DISPLAY_NAME };

		//联系人

		Cursor mCursor = getContentResolver().query(Contacts.CONTENT_URI,

				CONTACT_PROJECTION, null, null, null);

		//联系人电话

		Cursor phones = getContentResolver().query(

				ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,

				ContactsContract.CommonDataKinds.Phone.CONTACT_ID, null, null);

		while (mCursor.moveToNext()) {

			// 获取联系人

			String name = mCursor.getString(mCursor

					.getColumnIndex(Contacts.DISPLAY_NAME));

			mStrings.add(name);

			if (phones.moveToNext()) {

				//获取电话

				String phone = phones.getString(phones

						.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

				mStrings.add(phone);

			}

		}

		//关闭资源

		mCursor.close();

		phones.close();

	}

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