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NaviActivity实现

参考：慕课网《Android攻城狮的第二门课》和博客园博客：

该Activity采用了fragment作为数据源的ViewPager和自定义的title。现在开始实现该Activity：

1.在layout中添加控件，两个TextView用作头标，一个ImageView当做滑动条，再添加一个ViewPager控件。

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical" android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5     <LinearLayout
 6         android:id="@+id/linearLayout1"
 7         android:layout_width="fill_parent"
 8         android:layout_height="30dp"
 9         android:background="#FFFFFF" >
10 
11         <TextView
12             android:id="@+id/text1"
13             android:layout_width="fill_parent"
14             android:layout_height="wrap_content"
15             android:layout_weight="1.0"
16             android:gravity="center"
17             android:text="机房信息查询"
18             android:textColor="#000000"
19             android:textSize="22.0dip" />
20 
21         <TextView
22             android:id="@+id/text2"
23             android:layout_width="fill_parent"
24             android:layout_height="wrap_content"
25             android:layout_weight="1.0"
26             android:gravity="center"
27             android:text="页卡2"
28             android:textColor="#000000"
29             android:textSize="22.0dip" />
30     </LinearLayout>
31     <ImageView
32         android:id="@+id/cursor"
33         android:layout_width="fill_parent"
34         android:layout_height="wrap_content"
35         android:scaleType="matrix"
36         android:src="@drawable/title_indicator" />
37 
38     <android.support.v4.view.ViewPager
39         android:id="@+id/stuPager"
40         android:layout_width="wrap_content"
41         android:layout_height="wrap_content"
42         android:layout_gravity="center">
43     </android.support.v4.view.ViewPager>
44 
45 </LinearLayout>

2.提取从LoginActivity中传来的值

1   /**
2      * 上个页面传递过来的值
3      */
4     private int OldPagerNum(){
5         oldpager = getIntent();
6         return oldpager.getIntExtra("Authorization", 0);
7     }

3.初始化头标textview，在这里我们给每个头标定义了一个点击事件，点击头标切换fragment

 1 /**
 2      * 初始化头标
 3      */
 4     private void InitTextView() {
 5         t1 = (TextView) findViewById(R.id.text1);
 6         t2 = (TextView) findViewById(R.id.text2);
 7         t1.setBackgroundColor(Color.RED);
 8         t2.setBackgroundColor(Color.GREEN);
 9         
10         t1.setOnClickListener(new MyOnClickListener(0));
11         t2.setOnClickListener(new MyOnClickListener(1));
12     }

点击事件的实现

 1  /**
 2      * 头标点击监听
 3      */
 4     public class MyOnClickListener implements View.OnClickListener {
 5         private int index = 0;//页面索引
 6 
 7         public MyOnClickListener(int i) {
 8             index = i;
 9         }
10         //切换到对应页面
11         @Override
12         public void onClick(View v) {
13             pager.setCurrentItem(index);
14         }
15     }

4.初始化动画

 1     /**
 2      * 初始化动画
 3      */
 4     private void InitImageView() {
 5         cursor = (ImageView) findViewById(R.id.cursor);
 6         bmpWidth = BitmapFactory.decodeResource(getResources(), R.drawable.title_indicator)
 7                 .getWidth();// 获取图片宽度
 8         DisplayMetrics dm = new DisplayMetrics();
 9         getWindowManager().getDefaultDisplay().getMetrics(dm);
10         int screenW = dm.widthPixels;// 获取分辨率宽度
11         offset = (screenW / 2 - bmpWidth) / 2;// 计算偏移量
12         Matrix matrix = new Matrix();
13         matrix.postTranslate(offset, 0);
14         cursor.setImageMatrix(matrix);// 设置动画初始位置
15     }

5.初始化ViewPager

 1     /**
 2      * 初始化ViewPager
 3      */
 4     private void InitViewPager(int num) {
 5         pager = (ViewPager) findViewById(R.id.stuPager);
 6         fragtList = new ArrayList<Fragment>();
 7         //把LoginActivity传来的值传给所有的fragment
 8         Bundle bundle = new Bundle();
 9         bundle.putInt("Authorization", num);
10         machineInquiryActivity = new MachineInquiryActivity();
11         machineInquiryActivity.setArguments(bundle);
12         fragtList.add(machineInquiryActivity);
13         if (num == 0) {
14             stuInfoActivity = new StuInfoActivity();
15             stuInfoActivity.setArguments(bundle);
16             fragtList.add(stuInfoActivity);
17             t2.setText("用户信息");
18         }else{
19             stuInquiryActivity = new StuInquiryActivity();
20             stuInquiryActivity.setArguments(bundle);
21             fragtList.add(stuInquiryActivity);
22             t2.setText("学生信息查询");
23         }
24         //fragment适配器
25         MyFragmentPagerAdapter adapterFrag = new MyFragmentPagerAdapter(getSupportFragmentManager(), fragtList);
26         pager.setAdapter(adapterFrag);
27         pager.setCurrentItem(0);
28         //换页监听器，改变ImageView位置
29         pager.addOnPageChangeListener(new MyOnPageChangeListener(offset, bmpWidth, cursor));
30     }

Fragment适配器

 1 package com.example.wanderingzj.stumanage;
 2 
 3 import android.support.v4.app.Fragment;
 4 import android.support.v4.app.FragmentManager;
 5 import android.support.v4.app.FragmentStatePagerAdapter;
 6 import android.view.ViewGroup;
 7 
 8 import java.util.List;
 9 
10 /**
11  * Created by samsung on 2015/10/28.
12  */
13 public class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
14     private List<Fragment> fragList;
15 
16     public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> fragList){
17         super(fm);
18         this.fragList = fragList;
19     }
20 
21     @Override
22     public Fragment getItem(int position) {
23         return fragList.get(position);
24     }
25 
26     @Override
27     public int getCount() {
28         return fragList.size();
29     }
30 
31     @Override
32     public Object instantiateItem(ViewGroup container, int position) {
33         return super.instantiateItem(container, position);
34     }
35 
36     @Override
37     public void destroyItem(ViewGroup container, int position, Object object) {
38         super.destroyItem(container, position, object);
39     }
40 }

OnPageChangeListener类的实现，关于TranslateAnimation(float fromXDelta, float toXDelta,
                       float fromYDelta, float toYDelta)
第一个参数fromXDelta为动画起始时 X坐标上的移动位置
第二个参数toXDelta为动画结束时 X坐标上的移动位置
第三个参数fromYDelta为动画起始时Y坐标上的移动位置
第四个参数toYDelta为动画结束时Y坐标上的移动位置

 1 package com.example.wanderingzj.stumanage;
 2 
 3 import android.support.v4.view.ViewPager.OnPageChangeListener;
 4 import android.view.animation.Animation;
 5 import android.view.animation.TranslateAnimation;
 6 import android.widget.ImageView;
 7 
 8 /**
 9  * Created by samsung on 2015/11/3.
10  */
11 public class MyOnPageChangeListener implements OnPageChangeListener {
12     private int page1_offset, currIndex, page0_offset;//page0偏移量，当前页卡编号，page1偏移量
13     private ImageView cursor;//滑动条图片
14 
15 
16     public MyOnPageChangeListener(int offset, int bmpWidth, ImageView cursor){
17         currIndex = 0;
18         this.cursor = cursor;
19         this.page0_offset = offset;
20         page1_offset = offset * 2 + bmpWidth;//滑动条图片宽度
21     }
22 
23     @Override
24     public void onPageSelected(int arg0) {
25         Animation animation = null;
26         switch (arg0) {
27             case 0:
28                 if (currIndex == 1) {
29                     animation = new TranslateAnimation(page1_offset, page0_offset, 0, 0);
30                 }
31                 break;
32             case 1:
33                 if (currIndex == 0) {
34                     animation = new TranslateAnimation(page0_offset, page1_offset, 0, 0);
35                 }
36                 break;
37         }
38         currIndex = arg0;
39         animation.setFillAfter(true);// True:图片停在动画结束位置
40         animation.setDuration(300);
41         cursor.startAnimation(animation);
42     }
43 
44     @Override
45     public void onPageScrolled(int arg0, float arg1, int arg2) {
46     }
47 
48     @Override
49     public void onPageScrollStateChanged(int arg0) {
50     }
51 }

完整代码：

  1 package com.example.wanderingzj.stumanage;
  2 
  3 import android.app.Activity;
  4 import android.content.Intent;
  5 import android.graphics.BitmapFactory;
  6 import android.graphics.Color;
  7 
  8 import android.graphics.Matrix;
  9 import android.os.Bundle;
 10 import android.support.v4.app.Fragment;
 11 import android.support.v4.app.FragmentActivity;
 12 import android.support.v4.view.ViewPager.OnPageChangeListener;
 13 import android.support.v4.view.ViewPager;
 14 import android.util.DisplayMetrics;
 15 import android.view.View;
 16 import android.view.animation.Animation;
 17 import android.view.animation.TranslateAnimation;
 18 import android.widget.ImageView;
 19 import android.widget.TextView;
 20 
 21 import java.util.ArrayList;
 22 import java.util.List;
 23 
 24 
 25 /**
 26  * Created by samsung on 2015/10/28.
 27  */
 28 public class NaviActivity extends FragmentActivity{
 29     private ViewPager pager;
 30     private Intent oldpager;
 31     private List<Fragment> fragtList;
 32     private StuInfoActivity stuInfoActivity;
 33     private StuInquiryActivity stuInquiryActivity;
 34     private MachineInquiryActivity machineInquiryActivity;
 35     private TextView t1, t2;// 页卡头标
 36     private int num;
 37     private ImageView cursor;// 动画图片
 38     private int offset = 0;// 动画图片偏移量
 39     private int bmpWidth;// 动画图片宽度
 40 
 41     @Override
 42     protected void onCreate(Bundle savedInstanceState) {
 43         super.onCreate(savedInstanceState);
 44         setContentView(R.layout.activity_navi);
 45         num = OldPagerNum();
 46         InitTextView();
 47         InitImageView();
 48         InitViewPager(num);
 49     }
 50 
 51     /**
 52      * 初始化头标
 53      */
 54     private void InitTextView() {
 55         t1 = (TextView) findViewById(R.id.text1);
 56         t2 = (TextView) findViewById(R.id.text2);
 57         t1.setBackgroundColor(Color.RED);
 58         t2.setBackgroundColor(Color.GREEN);
 59 
 60         t1.setOnClickListener(new MyOnClickListener(0));
 61         t2.setOnClickListener(new MyOnClickListener(1));
 62     }
 63 
 64     /**
 65      * 头标点击监听
 66      */
 67     public class MyOnClickListener implements View.OnClickListener {
 68         private int index = 0;
 69 
 70         public MyOnClickListener(int i) {
 71             index = i;
 72         }
 73 
 74         @Override
 75         public void onClick(View v) {
 76             pager.setCurrentItem(index);
 77         }
 78     }
 79 
 80     /**
 81      * 初始化ViewPager
 82      */
 83     private void InitViewPager(int num) {
 84         pager = (ViewPager) findViewById(R.id.stuPager);
 85         fragtList = new ArrayList<Fragment>();
 86         //把LoginActivity传来的值传给所有的fragment
 87         Bundle bundle = new Bundle();
 88         bundle.putInt("Authorization", num);
 89         machineInquiryActivity = new MachineInquiryActivity();
 90         machineInquiryActivity.setArguments(bundle);
 91         fragtList.add(machineInquiryActivity);
 92         if (num == 0) {
 93             stuInfoActivity = new StuInfoActivity();
 94             stuInfoActivity.setArguments(bundle);
 95             fragtList.add(stuInfoActivity);
 96             t2.setText("用户信息");
 97         }else{
 98             stuInquiryActivity = new StuInquiryActivity();
 99             stuInquiryActivity.setArguments(bundle);
100             fragtList.add(stuInquiryActivity);
101             t2.setText("学生信息查询");
102         }
103         //fragment适配器
104         MyFragmentPagerAdapter adapterFrag = new MyFragmentPagerAdapter(getSupportFragmentManager(), fragtList);
105         pager.setAdapter(adapterFrag);
106         pager.setCurrentItem(0);
107         //换页监听器，改变ImageView位置
108         pager.addOnPageChangeListener(new MyOnPageChangeListener(offset, bmpWidth, cursor));
109     }
110 
111     /**
112      * 上个页面传递过来的值
113      */
114     private int OldPagerNum(){
115         oldpager = getIntent();
116         return oldpager.getIntExtra("Authorization", 0);
117     }
118 
119     /**
120      * 初始化动画
121      */
122     private void InitImageView() {
123         cursor = (ImageView) findViewById(R.id.cursor);
124         bmpWidth = BitmapFactory.decodeResource(getResources(), R.drawable.title_indicator)
125                 .getWidth();// 获取图片宽度
126         DisplayMetrics dm = new DisplayMetrics();
127         getWindowManager().getDefaultDisplay().getMetrics(dm);
128         int screenW = dm.widthPixels;// 获取分辨率宽度
129         offset = (screenW / 2 - bmpWidth) / 2;// 计算偏移量
130         Matrix matrix = new Matrix();
131         matrix.postTranslate(offset, 0);
132         cursor.setImageMatrix(matrix);// 设置动画初始位置
133     }
134 }

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原文地址：https://www.cnblogs.com/wanderingzj/p/4932824.html