ArrayAdapter_SimpleAdapter_SimpleCursorAdapter+SQL

ArrayAdapter_SimpleAdapter:

 1         private ListView listview;

 2     private ArrayAdapter<String>arr_adapter;

 3     private SimpleAdapter simp_adapter;

 4     private List<Map<String,Object>>dataList;

 5 

 6     @Override

 7     protected void onCreate(Bundle savedInstanceState) {

 8         super.onCreate(savedInstanceState);

 9         setContentView(R.layout.activity_man);

10         listview = (ListView)findViewById(R.id.listView1);

11         

12         String[]arr_data={"传说中的数据源1","传说中的数据源2","传说中的数据源3","传说中的数据源4"};

13         

14         //新建一个适配器

15         //参数：1.上下文 2.当前Listview加载的每一个列表项所对应的布局文件3.数据源

16         //arr_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);       //普通文字适配器

17         //视图加载适配器

18         //listview.setAdapter(arr_adapter);

19         

20         dataList = new ArrayList<Map<String,Object>>();

21         simp_adapter = new SimpleAdapter(this, getData(), R.layout.item, new String[]{"img","text"}, new int[]{R.id.img,R.id.text});

22         /*1.上下文

23          * 2.data:   数据源  List<? extends Map<String, ?>> data （一个map所组成的list集合）

24          *           每一个Map都会去对应ListView中的一行

25          *           每一个Map（键——值对）中的键必须包含所有在from中所指定的键

26          * 3.resource:列表项的布局文件ID

27          * 4.from：Map中的键名

28          * 5.to：绑定数据视图中的ID。与from成对应关系

29         */  

30         listview.setAdapter(simp_adapter);

31     }

32     

33     private List<Map<String,Object>> getData(){

34         

35         for(int i = 0; i < 20; i++){

36             Map<String, Object>map = new HashMap<String, Object>();

37             map.put("img", R.drawable.ic_launcher);

38             map.put("text", "传说中的数据源"+i);

39             dataList.add(map);

40         }

41         

42         return dataList;

43     }

SimpleCursorAdapter:

 1 public class ManActivity extends Activity {

 2     private EditText ed1 = null;

 3     private EditText ed2 = null;

 4     private Button btn = null;

 5     private ListView listview = null;

 6     private SimpleCursorAdapter adapter;

 7     private MySql mysql = null;

 8 

 9     @Override

10     protected void onCreate(Bundle savedInstanceState) {

11         super.onCreate(savedInstanceState);

12         setContentView(R.layout.activity_man);

13         this.mysql = new MySql(ManActivity.this);

14         ed1 = (EditText)findViewById(R.id.editText1);

15         ed2 = (EditText)findViewById(R.id.editText2);

16         listview = (ListView)findViewById(R.id.listView1);

17         btn = (Button)findViewById(R.id.button1);

18         btn.setOnClickListener(new OnClickListener() {

19             public void onClick(View view) {

20                 //插入数据库

21                 ContentValues values = new ContentValues();

22                 values.put("name", ed1.getText().toString());

23                 values.put("sex",ed2.getText().toString());        

24                 mysql.insert(values);  

25                 //刷新适配器

26                 Cursor cursor = mysql.query();

27                 adapter.changeCursor(cursor);

28 

29             }

30         });

31         Cursor c = mysql.query();

32         adapter = new SimpleCursorAdapter(this, R.layout.item, c, new String[]{mysql.NAME,mysql.SEX}, new int[]{R.id.textView1,R.id.textView2});

33         listview.setAdapter(adapter);

34         //listview绑定适配器

35         

36     }

37     

38     @Override

39     public boolean onCreateOptionsMenu(Menu menu) {

40         // Inflate the menu; this adds items to the action bar if it is present.

41         getMenuInflater().inflate(R.menu.man, menu);

42         return true;

43     }

44 

45 }

与SimpleCursorAdapter配套的SQL:

 1 public class MySql extends SQLiteOpenHelper{

 2     private final static String TABLE_NAME = "user";

 3     public static final String _ID = "_id";

 4     public static final String NAME = "name";

 5     public static final String SEX = "sex";

 6 

 7     private SQLiteDatabase db = null;

 8 

 9     public MySql(Context context) {

10         super(context, "user", null, 1);

11         // TODO Auto-generated constructor stub

12     }

13 

14     @Override

15     public void onCreate(SQLiteDatabase db) {

16         // TODO 创建数据库

17         db.execSQL("create table if not exists "+ TABLE_NAME +" " +

18                 " ("+ _ID +" integer primary key autoincrement,"

19                 + NAME +" text not null,"+ SEX +" text not null)");

20         

21     }

22 

23     @Override

24     public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {

25         // TODO Auto-generated method stub

26         

27     }

28     

29     /*插入方法*/

30     public void insert(ContentValues values){

31         SQLiteDatabase db = getWritableDatabase();  //获取SQLiteDatabase

32         db.insert(TABLE_NAME, null, values);   //插入数据库中

33         db.close();

34         

35     }

36     /*查询方法*/

37     public Cursor query(){

38         SQLiteDatabase db = getReadableDatabase();

39         Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);  // 获取Cursor

40         return cursor;

41     }

42     /*关闭数据库*/

43     public void close(){

44         if(db != null){

45             db.close();

46         }

47     }

48 

49 }