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import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
 
import java.util.ArrayList;
import java.util.List;
 
import tw.com.rockex6.IntentTest.R;
 
/**
 * Created by user on 2018/3/30.
 */
 
public class FragmentTest extends AppCompatActivity implements ViewPager.OnPageChangeListener {
    private LinearLayout ContentLayout;
    private HorizontalScrollView TopLayout;
    private RadioGroup mRadioGroup;
    private ViewPager mViewPager;
    private String[] topString = {"1"};
    private List<Fragment> mFragmentList = new ArrayList<>();
    private PageFragmentAdapter mPageFragmentAdapter;
 
    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        setContentView(R.layout.fragment_test);
        init();
        initTab();
        initViewPager();
    }
 
    private void init() {
        TopLayout = findViewById(R.id.top);
        ContentLayout = findViewById(R.id.content);
        mRadioGroup = findViewById(R.id.top_text);
        mViewPager = findViewById(R.id.view_pager);
        mViewPager.addOnPageChangeListener(this);
    }
 
    private void initTab() {
        for (int i = 0; i < topString.length; i++) {
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.tab, null);
            radioButton.setText(String.valueOf(i + 1));
            radioButton.setTextSize(20);
            RadioGroup.LayoutParams params = new RadioGroup.LayoutParams(
                    RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT
            );
            mRadioGroup.addView(radioButton, params);
        }
        setTab(0);
    }
 
    private void setTab(int position) {
        RadioButton radioButton = (RadioButton) mRadioGroup.getChildAt(position);
        radioButton.setChecked(true);
        for (int i = 0; i < mRadioGroup.getChildCount(); i++) {
            mRadioGroup.getChildAt(i).setSelected(false);
        }
        radioButton.setSelected(true);
        int left = radioButton.getLeft();
        int width = radioButton.getMeasuredWidth();
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int screenWidth = metrics.widthPixels;
        int len = left + width / 2 - screenWidth / 2;
        TopLayout.smoothScrollTo(len, 0);
    }
 
    private void initViewPager() {
        if (mPageFragmentAdapter == null) {
            for (String title : topString) {
                FragmentTest1 baseFragment = new FragmentTest1();
                Bundle bundle = new Bundle();
                bundle.putString("title", title);
                baseFragment.setArguments(bundle);
                mFragmentList.add(baseFragment);
            }
            mPageFragmentAdapter = new PageFragmentAdapter(getSupportFragmentManager(), mFragmentList);
        }
        mViewPager.setAdapter(mPageFragmentAdapter);
        mPageFragmentAdapter.notifyDataSetChanged();
    }
 
 
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
 
    }
 
    @Override
    public void onPageSelected(int position) {
        setTab(position);
    }
 
    @Override
    public void onPageScrollStateChanged(int state) {
 
    }
}

Main.java:21: error: class FragmentTest is public, should be declared in a file named FragmentTest.java
public class FragmentTest extends AppCompatActivity implements ViewPager.OnPageChangeListener {
       ^
Main.java:1: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:2: error: package android.support.v4.app does not exist
import android.support.v4.app.Fragment;
                             ^
Main.java:3: error: package android.support.v4.view does not exist
import android.support.v4.view.ViewPager;
                              ^
Main.java:4: error: package android.support.v7.app does not exist
import android.support.v7.app.AppCompatActivity;
                             ^
Main.java:5: error: package android.util does not exist
import android.util.DisplayMetrics;
                   ^
Main.java:6: error: package android.view does not exist
import android.view.LayoutInflater;
                   ^
Main.java:7: error: package android.widget does not exist
import android.widget.HorizontalScrollView;
                     ^
Main.java:8: error: package android.widget does not exist
import android.widget.LinearLayout;
                     ^
Main.java:9: error: package android.widget does not exist
import android.widget.RadioButton;
                     ^
Main.java:10: error: package android.widget does not exist
import android.widget.RadioGroup;
                     ^
Main.java:15: error: package tw.com.rockex6.IntentTest does not exist
import tw.com.rockex6.IntentTest.R;
                                ^
Main.java:21: error: cannot find symbol
public class FragmentTest extends AppCompatActivity implements ViewPager.OnPageChangeListener {
                                  ^
  symbol: class AppCompatActivity
Main.java:21: error: package ViewPager does not exist
public class FragmentTest extends AppCompatActivity implements ViewPager.OnPageChangeListener {
                                                                        ^
Main.java:22: error: cannot find symbol
    private LinearLayout ContentLayout;
            ^
  symbol:   class LinearLayout
  location: class FragmentTest
Main.java:23: error: cannot find symbol
    private HorizontalScrollView TopLayout;
            ^
  symbol:   class HorizontalScrollView
  location: class FragmentTest
Main.java:24: error: cannot find symbol
    private RadioGroup mRadioGroup;
            ^
  symbol:   class RadioGroup
  location: class FragmentTest
Main.java:25: error: cannot find symbol
    private ViewPager mViewPager;
            ^
  symbol:   class ViewPager
  location: class FragmentTest
Main.java:27: error: cannot find symbol
    private List<Fragment> mFragmentList = new ArrayList<>();
                 ^
  symbol:   class Fragment
  location: class FragmentTest
Main.java:28: error: cannot find symbol
    private PageFragmentAdapter mPageFragmentAdapter;
            ^
  symbol:   class PageFragmentAdapter
  location: class FragmentTest
Main.java:31: error: cannot find symbol
    public void onCreate(Bundle b) {
                         ^
  symbol:   class Bundle
  location: class FragmentTest
Main.java:30: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:32: error: cannot find symbol
        super.onCreate(b);
        ^
  symbol:   variable super
  location: class FragmentTest
Main.java:33: error: package R does not exist
        setContentView(R.layout.fragment_test);
                        ^
Main.java:40: error: package R does not exist
        TopLayout = findViewById(R.id.top);
                                  ^
Main.java:41: error: package R does not exist
        ContentLayout = findViewById(R.id.content);
                                      ^
Main.java:42: error: package R does not exist
        mRadioGroup = findViewById(R.id.top_text);
                                    ^
Main.java:43: error: package R does not exist
        mViewPager = findViewById(R.id.view_pager);
                                   ^
Main.java:49: error: cannot find symbol
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.tab, null);
            ^
  symbol:   class RadioButton
  location: class FragmentTest
Main.java:49: error: cannot find symbol
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.tab, null);
                                       ^
  symbol:   class RadioButton
  location: class FragmentTest
Main.java:49: error: package R does not exist
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.tab, null);
                                                                                       ^
Main.java:49: error: cannot find symbol
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.tab, null);
                                                    ^
  symbol:   variable LayoutInflater
  location: class FragmentTest
Main.java:52: error: package RadioGroup does not exist
            RadioGroup.LayoutParams params = new RadioGroup.LayoutParams(
                      ^
Main.java:52: error: package RadioGroup does not exist
            RadioGroup.LayoutParams params = new RadioGroup.LayoutParams(
                                                           ^
Main.java:53: error: package RadioGroup does not exist
                    RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT
                              ^
Main.java:53: error: package RadioGroup does not exist
                    RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT
                                                                    ^
Main.java:61: error: cannot find symbol
        RadioButton radioButton = (RadioButton) mRadioGroup.getChildAt(position);
        ^
  symbol:   class RadioButton
  location: class FragmentTest
Main.java:61: error: cannot find symbol
        RadioButton radioButton = (RadioButton) mRadioGroup.getChildAt(position);
                                   ^
  symbol:   class RadioButton
  location: class FragmentTest
Main.java:69: error: cannot find symbol
        DisplayMetrics metrics = new DisplayMetrics();
        ^
  symbol:   class DisplayMetrics
  location: class FragmentTest
Main.java:69: error: cannot find symbol
        DisplayMetrics metrics = new DisplayMetrics();
                                     ^
  symbol:   class DisplayMetrics
  location: class FragmentTest
Main.java:70: error: cannot find symbol
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        ^
  symbol:   method getWindowManager()
  location: class FragmentTest
Main.java:79: error: cannot find symbol
                FragmentTest1 baseFragment = new FragmentTest1();
                ^
  symbol:   class FragmentTest1
  location: class FragmentTest
Main.java:79: error: cannot find symbol
                FragmentTest1 baseFragment = new FragmentTest1();
                                                 ^
  symbol:   class FragmentTest1
  location: class FragmentTest
Main.java:80: error: cannot find symbol
                Bundle bundle = new Bundle();
                ^
  symbol:   class Bundle
  location: class FragmentTest
Main.java:80: error: cannot find symbol
                Bundle bundle = new Bundle();
                                    ^
  symbol:   class Bundle
  location: class FragmentTest
Main.java:85: error: cannot find symbol
            mPageFragmentAdapter = new PageFragmentAdapter(getSupportFragmentManager(), mFragmentList);
                                       ^
  symbol:   class PageFragmentAdapter
  location: class FragmentTest
Main.java:85: error: cannot find symbol
            mPageFragmentAdapter = new PageFragmentAdapter(getSupportFragmentManager(), mFragmentList);
                                                           ^
  symbol:   method getSupportFragmentManager()
  location: class FragmentTest
Main.java:92: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:97: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:102: error: method does not override or implement a method from a supertype
    @Override
    ^
50 errors

Standard output is empty