ContentProvider

在清单文件Application中注册

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

public class Myprovider extends ContentProvider {
    SQLiteDatabase database;
    public static final Uri URI = Uri.parse("content://com.jk.cp");

    @Override
    public boolean onCreate() {
        database = getContext().openOrCreateDatabase("mycp3",
                Context.MODE_PRIVATE, null);
        database.execSQL("create table tab(_id INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT NOT NULL)");

        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        // TODO Auto-generated method stub
        Cursor cursor = database.query("tab", null, null, null, null, null,
                null);
        return cursor;
    }

    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        // TODO Auto-generated method stub
        database.insert("tab", "_id", values);
        // database.close();
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }

}

//写
public class MainActivity extends ActionBarActivity {
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                write();
            }
        });
    }

    public void write() {
        ContentValues values = new ContentValues();
        values.put("name", "java");

        getContentResolver().insert(Myprovider.URI, values);
    }
}

//----------------------------------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();
        }
    }

}