ContentProvider 使用map数据源

下面是helper文件
public class Maphelper {
    public  ContentResolver cr;
    public  String URI = "content://com.xpoesd.diy.apphide/person/";

    public  Maphelper(int ContextClass){
        Context context;
        if (ContextClass==1){
            context = (Context) callMethod(callStaticMethod(findClass("android.app.ActivityThread", null), "currentActivityThread", new Object[0]), "getSystemContext", new Object[0]);
        }else {
            context = MainActivity.getInstance();
        }
        cr = context.getContentResolver();
    }

    private  void saveFile_C(String Filename,String FileValus) throws FileNotFoundException {
        OutputStream os = cr.openOutputStream(Uri.parse( URI+Filename));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os));
        try {
            bw.write("");
            bw.flush();
            bw.write(FileValus);
            bw.flush();
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public  void saveFile(String Filename,String FileValus){
        try {
            saveFile_C(Filename,FileValus);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    private  String getFile_C(String Filename) throws FileNotFoundException {
        InputStream is = cr.openInputStream(Uri.parse(URI+Filename));
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        String result="";
        String result_="";
        try {
            while((result = br.readLine() )!=null){
                result_=result_+result;
            }
            //result = br.readLine();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result_;
    }
    public  String getFile(String Filename)  {
        String str = "";
        try {
            str = getFile_C(Filename);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return str;
    }

    public  void putString(String name,String values)  {
        ContentValues value = new ContentValues();
        value.put(name, values);
        Uri insertColumn = cr.insert(Uri.parse(URI), value);
    }
    public  String getstring(String name)  {
        Cursor cursorResultAll =cr.query(Uri.parse(URI),null,name, null, null);
        assert cursorResultAll != null;
        if (cursorResultAll.getCount()>0) {
            cursorResultAll.moveToNext();
            String str = cursorResultAll.getString(1);
            //String str = cursorResultAll.getString(1);
                //int age = cursorResultAll.getInt(2);
            return str;
        }
        //MatrixCursor cursor =(MatrixCursor) cr.query(Uri.parse(URI),null,name, null, null);
        //cursor.getInt(2) 取数据类型
        return "";
    }
}

ContentProvider文件

public class MapProvider extends ContentProvider {

    private static final String AUTHORITY = "com.xpoesd.diy.apphide";
    private static final int TYPE_ALL = 1;
    private static final int TYPE_SINGLE = 2;
    public static final String CURSOR_COLUMN_NAME = "cursor_name";
    public static final String CURSOR_COLUMN_VALUE = "cursor_value";
    public static final String CURSOR_COLUMN_TYPE = "cursor_type";
    private static Map maps;
    private static UriMatcher mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

    static {
        mUriMatcher.addURI(AUTHORITY, "person", TYPE_ALL);
        mUriMatcher.addURI(AUTHORITY, "person/#", TYPE_SINGLE);
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        if (uri.toString().contains("content://"+AUTHORITY+"/person/")){
            if (selection==null){
                for(int i=0;i<selectionArgs.length;){
                    if (maps.containsKey(selectionArgs[i])){
                        maps.remove(selectionArgs[i]);
                    }
                    i++;
                }
            }else {
                if (maps.containsKey(selection)){
                    maps.remove(selection);
                }
            }
            return 1;
        }
        return -1;
    }

    @Override
    public String getType(Uri uri) {
        switch (mUriMatcher.match(uri)) {
            case TYPE_ALL:
                return "vnd.android.cursor.dir/person";
            case TYPE_SINGLE:
                return "vnd.android.cursor.item/person";
            default:
                return null;
        }
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        if (uri.toString().contains("content://"+AUTHORITY+"/person/")){
            Set set = values.keySet();
            Iterator it = set.iterator();
            while (it.hasNext()) {
                Object key = it.next();// it.next()返回的是set集合元素,也就是map中的键
                maps.put(key,values.get(key.toString()));
            }
        }
        return uri;
    }

    @Override
    public boolean onCreate() {
        maps= JSON.parseObject("{}");
        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] columns,
                        String selection, String[] selectionArgs,
                        String orderBy) {
       // String[] path= uri.toString().split("/");
        MatrixCursor cursor = new MatrixCursor(new String[]{CURSOR_COLUMN_NAME,CURSOR_COLUMN_VALUE,CURSOR_COLUMN_TYPE});
       // if (path.length<1){return cursor;}
       // String key=path[path.length-1];
        if (uri.toString().contains("content://"+AUTHORITY+"/person/")){
            if (maps.containsKey(selection)){
                Object[] rows=new Object[3];
                rows[0]=selection;
                rows[1]=maps.get(selection);
                if (rows[1] instanceof Boolean) {
                    rows[2]=1;
                }else
                if (rows[1] instanceof String) {
                    rows[2]=2;
                }else
                if (rows[1] instanceof Integer) {
                    rows[2]=3;
                }else
                if (rows[1] instanceof Long) {
                    rows[2]=4;
                }else
                if (rows[1] instanceof Float) {
                    rows[2]=5;
                }
                cursor.addRow(rows);
            }
            }
        return  cursor;
        }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        if (uri.toString().contains("content://"+AUTHORITY+"/person/")){
            Set set = values.keySet();
            Iterator it = set.iterator();
            while (it.hasNext()) {
                Object key = it.next();// it.next()返回的是set集合元素,也就是map中的键
                maps.put(key,values.get(key.toString()));
            }
        }
        return 1;
    }

    @Override
    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {

        File root = new File(getContext().getFilesDir() + "/" + uri.getPath());
        root.getParentFile().mkdirs();

        int imode = 0;
        if (mode.contains("w")) {
            imode |= ParcelFileDescriptor.MODE_WRITE_ONLY;
            if (!root.exists()) {
                try {
                    root.createNewFile();
                } catch (Exception ex) {
                }
            }
        }
        if (mode.contains("r")) imode |= ParcelFileDescriptor.MODE_READ_ONLY;
        if (mode.contains("+")) imode |= ParcelFileDescriptor.MODE_APPEND;

        return ParcelFileDescriptor.open(root, imode);
    }
}

代码东拼西凑的，用网上找的模板修改的，csdn留存方便记忆，如果有抄袭部分请见谅。

使用方法

Maphelper maphelper = new Maphelper(0);
String Bytes = JSON.toJSONString(maps);
maphelper.putString(filename_xml, Bytes);

maphelper.getstring(name);