Content Provider：查找手机联系人

String[] colums = {
    		Phone._ID,
    		Phone.DISPLAY_NAME
    };
    
    Uri contactUri = Phone.CONTENT_URI;

public String getQueryData()
    {
    	String result = "";
    	ContentResolver resolver = getContentResolver();
    	Cursor cursor = resolver.query(contactUri, colums, null, null, null);
    	int idIndex = cursor.getColumnIndex(Phone._ID);
    	int nameIndex = cursor.getColumnIndex(Phone.DISPLAY_NAME);
    	
    	for(cursor.moveToFirst(); cursor.isAfterLast() != true; cursor.moveToNext())
    	{
    		result += cursor.getString(idIndex) + "\t";
    		result += cursor.getString(nameIndex) + "\t\n";
    	}
    	
    	cursor.close();
    	return result;
    }