android内容提供者获取联系人练习

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在上一讲中，我们讲解了ContentProvider，在这里我们应用一下，获取手机上所有联系人，并启动Intent的回调和带结果的返回。

布局：

<RelativeLayout 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"
    tools:context="${relativePackage}.${activityClass}" >

    <EditText
        android:id="@+id/et_main_number"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入后选择一个联系人" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et_main_number"
        android:onClick="toContractList"
        android:text="选择联系人" />

</RelativeLayout>

点击按钮，弹出所有联系人，使用LIstView+BaseAdapter实现

id使用系统自带的，这样我们就可以继承ListActivity，getListView()方法即可获取ListView视图对象

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

</ListView>

item布局就是两个TextView

<?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="wrap_content"
     android:padding="5dp"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="80dp"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/tv_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textSize="18sp" 
        android:layout_marginLeft="18dp" />

</LinearLayout>

MainActivity.java

package com.hbk.contractlist;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends Activity {
    
    

	public EditText et_main_number;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
    
    
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_main_number = (EditText) findViewById(R.id.et_main_number);
	}
	
	public void toContractList(View v){
    
    
		//启动联系人列表界面，带回调
		startActivityForResult(new Intent(this, ContactListActivity.class), 1);
	}
	
	// 带结果返回
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
    
		if(requestCode==1&&resultCode==RESULT_OK){
    
    
			et_main_number.setText(data.getStringExtra("NUMBER"));
		}
		super.onActivityResult(requestCode, resultCode, data);
	}
}

ContractListActivity.java

package com.hbk.contractlist;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ListActivity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

public class ContactListActivity extends ListActivity implements OnItemClickListener {
    
    

	
	public ContractAdapter adapter;
	public List<Map<String, String>> data = new ArrayList<Map<String,String>>();
	public ListView listview;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
    
    
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_contact_list);
		
		listview = getListView();
		adapter = new ContractAdapter();
		// 查询联系人数据
		ContentResolver resolver = getContentResolver();
		// 查询条件
		String[] projection = new String[]{
    
    Phone.DISPLAY_NAME,Phone.NUMBER};
		// 联系人的Uri固定的
		Cursor cursor = resolver.query(Phone.CONTENT_URI, projection , null, null, null);
		while(cursor.moveToNext()){
    
    
			Map<String, String> map = new HashMap<String, String>();
			map.put("name", cursor.getString(0));
			map.put("number", cursor.getString(1));
			data.add(map);
		}
		listview.setAdapter(adapter);
		listview.setOnItemClickListener(this);
	}
	class ContractAdapter extends BaseAdapter{
    
    

		@Override
		public int getCount() {
    
    
			// TODO Auto-generated method stub
			return data.size();
		}

		@Override
		public Object getItem(int position) {
    
    
			// TODO Auto-generated method stub
			return data.get(position);
		}

		@Override
		public long getItemId(int position) {
    
    
			// TODO Auto-generated method stub
			return 0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
    
    
			if(convertView == null){
    
    
				convertView = View.inflate(ContactListActivity.this, R.layout.item_main, null);
			}
			Map<String,String> map = data.get(position);
			TextView nameTv = (TextView) convertView.findViewById(R.id.tv_name);
			TextView numberTv = (TextView) convertView.findViewById(R.id.tv_number);
			nameTv.setText(map.get("name"));
			numberTv.setText(map.get("number"));
			return convertView;
		}
		
	}
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
    
    
		Intent intent = getIntent();
		intent.putExtra("NUMBER", data.get(position).get("number"));
		// 设置数据返回
		setResult(RESULT_OK, intent);
		finish();
	}
}

测试的时候，可以在模拟器上新建几个联系人。