关于ProgressDialog无法显示的问题

神奇的老王 2014-04-15 04:57:04

我之前在尝试获取联系人信息的时候，发现读取联系人的时间比较久于是想在读取联系人的时候，应用显示一个进度条之类的东西
写了如下代码，为了省事没有加入多线程
但是测试发现ProgressDialog无法显示，请大家帮我看看是什么问题



package com.example.contactlist;



import java.util.ArrayList;

import java.util.List;



import android.app.ListActivity;

import android.app.ProgressDialog;

import android.content.Context;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;



public class MainActivity extends ListActivity {



	Context myContext = null;

	MyListAdapter myListAdapter = null;

	ViewHolder viewHolder = null;

	

	private ProgressDialog progressDialog = null;

	

	//用于存储联系人名称

	List<String> myContactName = new ArrayList<String>();

	//用于存储联系人电话

	List<String> myContactNumber = new ArrayList<String>();

	//用于存储联系人总数

	int myContactAmount = 0;



	public void onCreate(Bundle savedInstanceState) {

		

		myContext = this;



		getContactInfo();

		

		myListAdapter = new MyListAdapter(this);

		setListAdapter(myListAdapter);

		super.onCreate(savedInstanceState);

	}

	

	public void getContactInfo(){

		//使用getContentResolver方法来读取联系人的表

		Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,null, null, null, null); 

		

		//获取联系人总数

		myContactAmount = cursor.getCount();

		

		//声明一个progressDialog

		progressDialog = new ProgressDialog(MainActivity.this);

		progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

		progressDialog.setTitle("正在获取联系人信息，请稍等：");

		progressDialog.setIndeterminate(false);   

		progressDialog.setMax(myContactAmount);

		progressDialog.show();

		

		int i = 0;

		while(cursor.moveToNext()){ 

			i++;

				//联系人的ID

				String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID)); 

				//联系人的名称

				String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)); 

				//联系人的电话

				String number = "";

				

				//联系人是否有电话号码

				int isHas = Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts. HAS_PHONE_NUMBER))); 

				  

				if(isHas>0){ 

					Cursor c = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID+" = " + id,null,null); 

					while(c.moveToNext()){ 

						number += c.getString(c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))+"  "; 					

					} 

					c.close(); 

				} 

				myContactName.add(name);

				myContactNumber.add(number);

				progressDialog.setProgress(i);

		} 

		cursor.close();

		progressDialog.dismiss();		

		

	}

	

	class MyListAdapter extends BaseAdapter {

		

		public MyListAdapter(Context context){

			myContext = context;

		}

	



		public int getCount() {

			// TODO Auto-generated method stub

			return myContactName.size();

		}

	

		public Object getItem(int position) {

			// TODO Auto-generated method stub

			return position;

		}

	

		public long getItemId(int position) {

			// TODO Auto-generated method stub

			return position;

		}

	

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

			// TODO Auto-generated method stub

			



			if(convertView == null){

				viewHolder = new ViewHolder();



				convertView = LayoutInflater.from(myContext).inflate(R.layout.list, null);

				viewHolder.name = (TextView) convertView.findViewById(R.id.name);

				viewHolder.number = (TextView) convertView.findViewById(R.id.number);

				

				convertView.setTag(viewHolder);

			}else

	        {

	            viewHolder = (ViewHolder) convertView.getTag();

	        }



			viewHolder.name.setText(myContactName.get(position));

			viewHolder.number.setText(myContactNumber.get(position));

			

			return convertView;

		}

	}



    private static class ViewHolder

    {

        TextView name;

        TextView number;

     

    }



}