ContentProvider和Resolver

• android Mainfest

//可根据不同应用设置不同权限<permission android:name""            android:protectionLevel="选择"/><application    <provider            android:authorities=""            android:name=".MyContentProvider"            //可被调用               android:exported="true"            android:enabled="true"            //权限            android:readPermission=""            android:writePermission=""            android:grantUriPermissions="true"            >        </provider>    </application>

// 帮助类//ContentUris可以帮助uri加入id//provider类中ContentUris.withAppendedId(uri,id);//resolve类中Uri uri2 = resolver.insert(uri,values);long id=ContentUris.parseId(uri2);

增加

ContentProvider及内部方法

 @Override    public Uri insert(Uri uri, ContentValues values) {        long id = 0;        if(values.size() > 0) {            id = db.insert("mingyang_tb", null, values);        }else{            String authority = uri.getAuthority();            String path = uri.getPath();            String query = uri.getQuery();            String name = uri.getQueryParameter("name");            String age = uri.getQueryParameter("age");            String gender = uri.getQueryParameter("gender");            Log.e("TAG","主机名：" + authority + "，路径：" + path + "，查询数据：" + query                    + "，姓名：" + name + "，年龄：" + age + ",性别：" + gender);            values.put("name" , name);            values.put("age" , age);            values.put("gender" , gender);            id = db.insert("info_tb",null,values);        }        //将id追加到uri后面        return  ContentUris.withAppendedId(uri,id);    }

• resolve中处理insert

ContentResolver resolver=getContentResolver();//寻找providerUri uri = Uri.parse("content://"authorities"");ContentValues values = new ContentValues();//put put putUri uri2 = resolver.insert(uri,values);//方法返回(long)idlong id = ContentUris.parseId(uri2);

查询

• provider

@Override    public Cursor query(Uri uri, String[] projection, String selection,            String[] selectionArgs, String sortOrder) {        //参数2：索要查询的列        //参数3：查询条件        //参数4:查询条件值        //参数5：分组        //参数6：分组条件        //参数7：排序        Cursor c = db.query("my_tb",projection,selection,selectionArgs,null,null,sortOrder);        return  c;    }

• resolver

Cursor c = resolver.query(uri,null,null,null,null);                //参数2：每一个学员信息对象所显示的样式布局                //参数3：数据源                //参数4：查询结果中所有列的列名                //参数5：数据未来所要加载到的对应控件的id数组                //参数6:是否及时更新界面                SimpleCursorAdapter adapter = new SimpleCursorAdapter(this ,                        R.layout.item,                        c,                        new String[]{"_id","name","age","gender"},                        new int[]{R.id.id_txt,R.id.name_txt,R.id.age_txt,R.id.gender_txt},                        CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);                stuList.setAdapter(adapter);

删除

返回值为修改的对象数量

URIMatcher

在provider中制定匹配规则 当调用匹配方法时 根据不同uri进行不同的处理
此处#表示所有数字都可以 *表示所有字符都可以

//在creat中制定    //参数:无法匹配UriMatcher matcher=new UriMatcher(UriMatcher.NO_MATCH);//参数1: 当前provider的authorities//参数2:子路径//参数3:匹配成功返回的codematcher.addURI("com.sjx.yic","hello/#",999);matcher.addURI("com.sjx.yic","hello/*",998);//在某个方法里int code = matcher.match(uri);

在resolver中调用方法时传入不同的authorities就行

URI自带解析方法

• provider操作

if(values!>0){String authority = uri.getAuthority();            //就是resolver中的?前面的字符串            String path = uri.getPath();            //整个?后面的所有            String query = uri.getQuery();            //单个获取?后面的参数根据域名            String name = uri.getQueryParameter("name");            String age = uri.getQueryParameter("age");            String gender = uri.getQueryParameter("gender");            values.put("name" ,name);            values.put("age" , age);            values.put("gender" , gender);            id = db.insert("my_tb",null,values);}

resolver.insert(Uri.parse("content://com.imooc.myprovider/'任意字符串'?name=张三&age=23&gender=男"),                        new ContentValues());

注意: oncreat在主线程中,其他4个方法都在子线程