java - 带路径解析器 : Points are too far apart Navigation Drawer

Question

你好，当我尝试将抽屉导航移动到其中一个 fragment 时，它会跳转到主 Activity XML 而不是 fragment ，我尝试检查我的导入类是否与我使用的 android 库和支持相同图书馆并没有帮助。

这是我的代码:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    FragmentManager fragmentManager = getFragmentManager();



    if (id == R.id.nav_first_layout) {
        fragmentManager.beginTransaction().replace(R.id.content_frame,new FirstFragment());
    }


    else if (id == R.id.nav_second_layout) {
        fragmentManager.beginTransaction().replace(R.id.content_frame,new SecondFragment());


    } else if (id == R.id.nav_third_layout) {
        fragmentManager.beginTransaction().replace(R.id.content_frame,new ThirdFragment() );
    }
    else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

当我尝试按下其中一项时，我收到下一条消息:W/PathParser:点相距太远 4.000000596046461有什么建议吗？

Answer 1

我发现我的问题是缺少命令，需要替换这段代码:

 if (id == R.id.nav_first_layout) {
    fragmentManager.beginTransaction().replace(R.id.content_frame,new FirstFragment());
}

使用此代码:

if (id == R.id.nav_first_layout) {
        fragmentManager.beginTransaction().replace(R.id.content_frame,new FirstFragment()).commit();
    }

我缺少 .commit 命令。