小编zod*_*101的帖子

当我尝试构建我的android项目时,我得到了这个错误

错误:(8,37)错误:包android.support.design.widget不存在错误:(18,9)错误:找不到符号类TabLayout错误:(18,32)错误:找不到符号类TabLayout错误: (21,33)错误:找不到符号变量TabLayout错误:(27,56)错误:包TabLayout不存在错误:(48,36)错误:找不到符号变量菜单错误:(28,57)错误:包TabLayout不存在错误:任务':app:compileDebugJavaWithJavac'的执行失败.

编译失败; 请参阅编译器错误输出以获取详细信 错误:(55,23)错误:无法找到符号变量action_settings

这是我的代码

package com.chaos.creativo;

import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.support.design.widget.TabLayout;

/**
 * Created by ahmed on 3/7/2016.
 */
public class Signin_up extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.signing_up);
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
        tabLayout.addTab(tabLayout.newTab().setText("SIGN IN"));
        tabLayout.addTab(tabLayout.newTab().setText("SIGN UP"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
        final PageAdapter adapter = new PageAdapter(getSupportFragmentManager(), tabLayout.getTabCount());

        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            } …