1 package com.hyl.acccountbookdemo;
2
3 import android.graphics.Color;
4 import android.os.Bundle;
5 import android.support.v4.app.Fragment;
6 import android.support.v4.app.FragmentManager;
7 import android.support.v4.app.FragmentPagerAdapter;
8 import android.support.v4.view.ViewPager;
9 import android.support.v7.app.AppCompatActivity;
10 import android.view.View;
11 import android.widget.TextView;
12
13 import java.util.ArrayList;
14 import java.util.List;
15
16 /**
17 * @programName: MainActivity.java
18 * @programFunction: Recording of income and expenditure
19 * @createDate: 2018/09/25
20 * @author: AnneHan
21 * @version:
22 * xx. yyyy/mm/dd ver author comments
23 * 01. 2018/09/25 1.00 AnneHan New Create
24 */
25 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
26 private TextView item_detail, item_category_report;
27 private ViewPager vp;
28 private OneFragment oneFragment;
29 private TwoFragment twoFragment;
30 private List<Fragment> mFragmentList = new ArrayList<Fragment>();
31 private FragmentAdapter mFragmentAdapter;
32
33 @Override
34 protected void onCreate(Bundle savedInstanceState) {
35 super.onCreate(savedInstanceState);
36 setContentView(R.layout.activity_main);
37
38 initViews();
39
40 mFragmentAdapter = new FragmentAdapter(this.getSupportFragmentManager(), mFragmentList);
41 vp.setOffscreenPageLimit(2);//ViewPager的缓存为2帧
42 vp.setAdapter(mFragmentAdapter);
43 vp.setCurrentItem(0);//初始设置ViewPager选中第一帧
44 item_detail.setTextColor(Color.parseColor("#1ba0e1"));
45
46 //ViewPager的监听事件
47 vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
48 @Override
49 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
50
51 }
52
53 @Override
54 public void onPageSelected(int position) {
55 /*此方法在页面被选中时调用*/
56 changeTextColor(position);
57 }
58
59 @Override
60 public void onPageScrollStateChanged(int state) {
61 /*此方法是在状态改变的时候调用，其中arg0这个参数有三种状态（0，1，2）。
62 arg0==1的时辰默示正在滑动，
63 arg0==2的时辰默示滑动完毕了，
64 arg0==0的时辰默示什么都没做。*/
65 }
66 });
67 }
68
69 /**
70 * 初始化布局View
71 */
72 private void initViews() {
73 item_detail = (TextView) findViewById(R.id.item_detail);
74 item_category_report = (TextView) findViewById(R.id.item_category_report);
75
76 item_detail.setOnClickListener(this);
77 item_category_report.setOnClickListener(this);
78
79 vp = (ViewPager) findViewById(R.id.mainViewPager);
80 oneFragment = new OneFragment();
81 twoFragment = new TwoFragment();
82 //给FragmentList添加数据
83 mFragmentList.add(oneFragment);
84 mFragmentList.add(twoFragment);
85 }
86
87 /**
88 * 点击头部Text 动态修改ViewPager的内容
89 */
90 @Override
91 public void onClick(View v) {
92 switch (v.getId()) {
93 case R.id.item_detail:
94 vp.setCurrentItem(0, true);
95 break;
96 case R.id.item_category_report:
97 vp.setCurrentItem(1, true);
98 break;
99 }
100 }
101
102 public class FragmentAdapter extends FragmentPagerAdapter {
103
104 List<Fragment> fragmentList = new ArrayList<Fragment>();
105
106 public FragmentAdapter(FragmentManager fm, List<Fragment> fragmentList) {
107 super(fm);
108 this.fragmentList = fragmentList;
109 }
110
111 @Override
112 public Fragment getItem(int position) {
113 return fragmentList.get(position);
114 }
115
116 @Override
117 public int getCount() {
118 return fragmentList.size();
119 }
120
121 }
122
123 /**
124 * 由ViewPager的滑动修改头部导航Text的颜色
125 * @param position
126 */
127 private void changeTextColor(int position) {
128 if (position == 0) {
129 item_detail.setTextColor(Color.parseColor("#1ba0e1"));
130 item_category_report.setTextColor(Color.parseColor("#000000"));
131 } else if (position == 1) {
132 item_category_report.setTextColor(Color.parseColor("#1ba0e1"));
133 item_detail.setTextColor(Color.parseColor("#000000"));
134 }
135 }
136 }
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