ContentProvider

在清单文件Application中注册

//-----------------------------内容提供者-----写------------------------------------------------

 1 public class Myprovider extends ContentProvider {
 2     SQLiteDatabase database;
 3     public static final Uri URI = Uri.parse("content://com.jk.cp");
 4 
 5     @Override
 6     public boolean onCreate() {
 7         database = getContext().openOrCreateDatabase("mycp3",
 8                 Context.MODE_PRIVATE, null);
 9         database.execSQL("create table tab(_id INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT NOT NULL)");
10 
11         return true;
12     }
13 
14     @Override
15     public Cursor query(Uri uri, String[] projection, String selection,
16             String[] selectionArgs, String sortOrder) {
17         // TODO Auto-generated method stub
18         Cursor cursor = database.query("tab", null, null, null, null, null,
19                 null);
20         return cursor;
21     }
22 
23     @Override
24     public String getType(Uri uri) {
25         // TODO Auto-generated method stub
26         return null;
27     }
28 
29     @Override
30     public Uri insert(Uri uri, ContentValues values) {
31         // TODO Auto-generated method stub
32         database.insert("tab", "_id", values);
33         // database.close();
34         return null;
35     }
36 
37     @Override
38     public int delete(Uri uri, String selection, String[] selectionArgs) {
39         // TODO Auto-generated method stub
40         return 0;
41     }
42 
43     @Override
44     public int update(Uri uri, ContentValues values, String selection,
45             String[] selectionArgs) {
46         // TODO Auto-generated method stub
47         return 0;
48     }
49 
50 }

 1 //写
 2 public class MainActivity extends ActionBarActivity {
 3     Button button;
 4 
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.fragment_main);
 9         button = (Button) findViewById(R.id.button1);
10         button.setOnClickListener(new OnClickListener() {
11 
12             @Override
13             public void onClick(View v) {
14                 // TODO Auto-generated method stub
15                 write();
16             }
17         });
18     }
19 
20     public void write() {
21         ContentValues values = new ContentValues();
22         values.put("name", "java");
23 
24         getContentResolver().insert(Myprovider.URI, values);
25     }
26 }

//----------------------------------读-----------------------------------

//读
public class MainActivity extends ActionBarActivity {
    Uri URI = Uri.parse("content://com.jk.cp");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        Cursor cursor = getContentResolver().query(URI, null, null, null, null);
        cursor.moveToFirst();
        for (int i = 0; i < cursor.getCount(); i++) {
            String value = cursor.getString(cursor.getColumnIndex("name"));
            Toast.makeText(getApplicationContext(), value, 0).show();
            cursor.moveToNext();
        }
    }

}