Question

即时通讯使用导航抽屉活动，我坚持一个问题。我收到此错误消息

Cannot resolve Method 'replace (int)

我正在看一个教程，但这个家伙并没有得到错误消息。我也试图通过阅读其他帖子来解决问题，但它让我更加困惑。

我的代码如下：

MainActivity.java

package androfenix.mycvapp;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.FragmentManager;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @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.addDrawerListener(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();

        if (id == R.id.nav_aboutme) {
            FragmentAboutme fragmentAboutme = new FragmentAboutme();
            FragmentManager manager = getSupportFragmentManager();
            manager.beginTransaction().replace(R.id.relativelayout_for_fragment).commit(fragmentAboutme);

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

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

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

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

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

        }

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

我要替换的布局片段就是这个：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/relativelayout_for_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="androfenix.mycvapp.MainActivity"
    tools:showIn="@layout/app_bar_main">

</android.support.constraint.ConstraintLayout>

Answer 1

此处FragmentTransaction.Commit()不需要辩论

所以代替：

manager.beginTransaction().replace(R.id.relativelayout_for_fragment).commit(fragmentAboutme);

使用：

manager.beginTransaction().replace(R.id.relativelayout_for_fragment, fragmentAboutme).commit();

还要确保您的FragmentAboutme正在扩展支持库

import android.support.v4.app.Fragment;

Answer 2

请研究片段

replace(R.id.relativelayout_for_fragment,"your about me fragment").commit();

为什么你甚至会在commit（）方法中传递片段对象，没有这样的方法;

无法解析Fragment的方法'replace（int）'

2 个答案: