can not resolve constructor (ArrayAdapter) ?

Question

错误地方

代码

package com.example.fiz.myapplication;

import android.annotation.SuppressLint;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.LinearLayout;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import java.util.ArrayList;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.support.v7.widget.Toolbar;
import android.widget.TextView;
import android.widget.ListView;
import android.widget.ArrayAdapter;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private ViewPager mPager;
private ArrayList<Fragment> fragmentsList;
private LinearLayout ll_top;

//LITview
//定义一个String数组用来显示ListView的内容private ListView lv;/** Called when the activity is first created. */

private static final String[] strs=new String[]{"first", "second", "third", "fourth", "fifth"};
private  ListView lv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.setTitle("demo");
    toolbar.setSubtitle("1234");
    toolbar.setLogo(R.drawable.ic_launcher);
    setSupportActionBar(toolbar);
    //

    initView();

}

private void initView() {

    ll_top = (LinearLayout) findViewById(R.id.ll_top);
    mPager = (ViewPager) findViewById(R.id.vPager);
    fragmentsList = new ArrayList<Fragment>();

    Fragment activityfragment = TestFragment.newInstance("界面一");
    Fragment groupFragment = TestFragment.newInstance("界面2");
    Fragment friendsFragment = TestFragment.newInstance("界面3");
    Fragment chatFragment = TestFragment.newInstance("界面4");
    Fragment about = About.about("1234");
    //实例化
    Fragment homepage = new HomePage("首页");

    fragmentsList.add(homepage);/**首页**/
    fragmentsList.add(groupFragment);
    fragmentsList.add(friendsFragment);
    fragmentsList.add(chatFragment);

    mPager.setAdapter(new MyFragmentPagerAdapter(
            getSupportFragmentManager(), fragmentsList));
    mPager.setCurrentItem(0);

    BottomTabBar navigationBar = new BottomTabBar(this);
    ll_top.setBackgroundColor(Color.parseColor("#F8F8FF"));
    navigationBar.attachToParent(ll_top, new String[]{"首页", "消息", "发现",
            "我"}, mPager);
}

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

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {

    private ArrayList<Fragment> fragmentsList;

    public MyFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    public MyFragmentPagerAdapter(FragmentManager fm,
                                  ArrayList<Fragment> fragments) {
        super(fm);
        this.fragmentsList = fragments;
    }

    @Override
    public int getCount() {
        return fragmentsList.size();
    }

    @Override

    public Fragment getItem(int arg0) {

        return fragmentsList.get(arg0);
    }

    @Override
    public int getItemPosition(Object object) {
        return super.getItemPosition(object);
    }

}

@SuppressLint("ValidFragment")
public class HomePage extends Fragment {
    private String textString;
    //复制添加

    public HomePage(String textString) {
        this.textString = textString;
    }

    public  HomePage homePage(String textString) {
        HomePage myabout = new HomePage(textString);
        return myabout;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        lv = (ListView)findViewById(R.id.lv);

        lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, strs));

        View view = inflater.inflate(R.layout.home_page, container, false);

        return view;
    }
}

}

Answer 1

上下文对象用的不对，fragment中adapter的this得用getActivity()替代啊。

Answer 2

ArrayAdapter的构造方法的第一参数是要一个上下文类型的,你传的this是HomePage,类型不符合无法解析