错误：与元素类型关联的属性"xmlns:tools"的值"FrameLayout"不得包含"<"字符

Question

>我有一个错误 D：\Project Android\My Mall\app\src\main\res\values\strings.xml：3：6： 错误：与元素类型"FrameLayout"关联的属性"xmlns：tools"的值不得包含"<"字符。

字符串中的代码.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.and>
    <string name=" title_activity_main>
    <string name="navigation_drawer_open">Open navigation drawer</string>
    <string name="navigation_drawer_close">Close navigation drawer</string>
    <string name="nav_header_title">Android Studio</string>
    <string name="nav_header_subtitle">[e-mail]</string>
    <string name="nav_header_desc">Navigation header</string>
    <string name="action_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
</FrameLayout>
    ">MainActivity</string></FrameLayout>

主活动中的代码.java

package com.example.mymall;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
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);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
        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.main_search_icon) {
            //todo:search
            return true;
        }else if (id== R.id.main_notification_icon){
            //todo:notification
            return true;
        }else if (id == R.id.main_cart_icon){
            //todo:cart
            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_my_orders) {
            // Handle the camera action
        } else if (id == R.id.nav_my_rewards) {
        } else if (id == R.id.nav_my_carts) {
        } else if (id == R.id.nav_my_whislist) {
        } else if (id == R.id.nav_my_account) {
        }
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
}

服务器给我这个错误：

D:Project AndroidMy Mallappsrcmainresvaluesstrings.xml:3:6: Error: The value of attribute "xmlns:tools" associated with an element type "FrameLayout" must not contain the '<' character.

如何解决我的问题？

Answer 1

您的strings.xml文件应该将<resources>标签作为root，例如

<resources>
    <string name="app_name">My Application</string>
</resources>

因此，您必须将文件更改为：

<resources>   
    <string name="navigation_drawer_open">Open navigation drawer</string>
    <string name="navigation_drawer_close">Close navigation drawer</string>
    <string name="nav_header_title">Android Studio</string>
    <string name="nav_header_subtitle">[e-mail]</string>
    <string name="nav_header_desc">Navigation header</string>
    <string name="action_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
</resources>