android内容提供者获取联系人练习

迷南。 2023-01-05 12:07 137阅读 0赞

前些天发现了一个巨牛的人工智能学习网站，通俗易懂，风趣幽默，忍不住分享一下给大家。[点击跳转到教程][Link 1]  
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：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1YW5nYmFva2FuZw_size_16_color_FFFFFF_t_70]

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

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。

[Link 1]: https://www.captainai.net/flyop007/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1YW5nYmFva2FuZw_size_16_color_FFFFFF_t_70]: /images/20221119/2544227fa74c499696c58a267cb29765.png