Android中的ContactPicker(選擇聯系人) 詳解

Android API: http://developer.android.com/reference/android/content/Intent.html

ContactPicker:用戶可以選擇一個聯系人.

1. 創建ContactPicker活動(Activity)

位置: java->package-> ContactPicker.java

package mzx.spike.contactpicker.app;  
      
import android.app.Activity;  
import android.content.ContentUris;  
import android.content.Intent;  
import android.database.Cursor;  
import android.net.Uri;  
import android.os.Bundle;  
import android.provider.ContactsContract;  
import android.view.View;  
import android.widget.AdapterView;  
import android.widget.ListView;  
import android.widget.SimpleCursorAdapter;  
      
/** 
 * Created by C.L.Wang on 14-3-20. 
 */
public class ContactPicker extends Activity {  
      
    @Override
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
      
        final Cursor c = getContentResolver().query(  
                ContactsContract.Contacts.CONTENT_URI, null, null, null, null
        );  
      
        String[] from = new String[]{ContactsContract.Contacts.DISPLAY_NAME_PRIMARY};  
        int[] to = new int[]{R.id.itemTextView};  
      
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.listitemlayout, c, from, to, 0);  
        ListView lv = (ListView)findViewById(R.id.contactListView);  
      
        lv.setAdapter(adapter);  
      
        lv.setOnItemClickListener(new ListView.OnItemClickListener(){  
            public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {  
                c.moveToPosition(pos);  
                int rowId = c.getInt(c.getColumnIndexOrThrow("_id"));  
                Uri outURI = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, rowId);  
                Intent outData = new Intent();  
                outData.setData(outURI);  
                setResult(Activity.RESULT_OK, outData);  
                finish();  
            }  
        });  
    }  
}

詳解:

1.  創建一個活動繼承Activity, 顯示activity_main界面;

2. 創建游標Cursor遍歷存儲在聯系人列表中的聯系人;

3. 構造簡單游標適配器(SimpleCursorAdapter), 注意此方法標記為遺棄, 後面需要加上參數0, 版本SDK11+;

4. 將適配器綁定至ListView, setAdapter();

5. 添加項目點擊事件(setOnItemClickListener), 將游標移植點擊位置, 取出rowID, 構造URI, 將URI綁定至Intent,;

6. 返回結果, setResult(), 結果碼(Activity_RESULT_OK) 和 Intent;

2. 修改activity_main.xml

位置: res->layout->activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
>  
      
    <ListView android:id="@+id/contactListView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
     />  
      
</RelativeLayout>

添加ListView, ContactPicker會調用此布局(layout);

3. 創建listitemlayout.xml

位置: res->layout->listitemlayout.xml

<?xml version="1.0" encoding="utf-8"?>  
      
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >  
      
    <TextView
        android:id="@+id/itemTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="16dp"
        android:textColor="#F0F"
     />  
      
</LinearLayout>

TextView顯示ListView中的每一個聯系人, ContactPicker會調用此布局(layout);

4. 創建測試布局contactpickertester.xml

位置: res->layout->contactpickertester.xml

<?xml version="1.0" encoding="utf-8"?>  
      
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >  
      
    <TextView
        android:id="@+id/selected_contact_textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
     />  
      
    <Button
        android:id="@+id/pick_contact_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Pick Contact"
     />  
      
</LinearLayout>

TextView顯示選擇的聯系人,Button選擇按鈕, 啟動界面;

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