ViewPager+Fragment的结合使用，实现QQ界面的理解

http://www.cssxt.com/html/2449/2449.html

效果如图：
ViewPager+Fragment的结合使用，实现QQ界面的理解ViewPager+Fragment的结合使用，实现QQ界面的理解ViewPager+Fragment的结合使用，实现QQ界面的理解ViewPager+Fragment的结合使用，实现QQ界面的理解

实现代码解析：
MainActivity.java
1.引入布局文件
2.4个标题控件的初始化以及点击事件的监听设置
3.viewpager控件的初始化，获取Fragment对象并保存在容器中，设置viewpager的适配器和监听
4.viewpager的监听OnPageChangeListener方法的实现，主要是标题栏下的指示横线的移动操作。

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
 
package com.aven.qqdemo;

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

import android.content.res.Resources;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

import com.demo.R;

/**
 * 参考原作者D.Winter基础，
 * 
 * @author avenwu
 * iamavenwu@gmail.com
 * 
 */
public class MainActivity extends FragmentActivity {
    private static final String TAG = "MainActivity";
    private ViewPager mPager;
    private ArrayList<Fragment> fragmentsList;
    private ImageView ivBottomLine;
    private TextView tvTabActivity, tvTabGroups, tvTabFriends, tvTabChat;

    private int currIndex = 0;
    private int bottomLineWidth;
    private int offset = 0;
    private int position_one;
    private int position_two;
    private int position_three;
    private Resources resources;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
        resources = getResources();
        InitWidth();
        InitTextView();
        InitViewPager();
    }

    private void InitTextView() {
        tvTabActivity = (TextView) findViewById(R.id.tv_tab_activity);
        tvTabGroups = (TextView) findViewById(R.id.tv_tab_groups);
        tvTabFriends = (TextView) findViewById(R.id.tv_tab_friends);
        tvTabChat = (TextView) findViewById(R.id.tv_tab_chat);

        tvTabActivity.setOnClickListener(new MyOnClickListener(0));
        tvTabGroups.setOnClickListener(new MyOnClickListener(1));
        tvTabFriends.setOnClickListener(new MyOnClickListener(2));
        tvTabChat.setOnClickListener(new MyOnClickListener(3));
    }

    private void InitViewPager() {
        mPager = (ViewPager) findViewById(R.id.vPager);
        fragmentsList = new ArrayList<Fragment>();

        Fragment activityfragment = TestFragment.newInstance("Hello Activity.");
        Fragment groupFragment = TestFragment.newInstance("Hello Group.");
        Fragment friendsFragment=TestFragment.newInstance("Hello Friends.");
        Fragment chatFragment=TestFragment.newInstance("Hello Chat.");

        fragmentsList.add(activityfragment);
        fragmentsList.add(groupFragment);
        fragmentsList.add(friendsFragment);
        fragmentsList.add(chatFragment);

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

    private void InitWidth() {
        ivBottomLine = (ImageView) findViewById(R.id.iv_bottom_line);
        bottomLineWidth = ivBottomLine.getLayoutParams().width;
        Log.d(TAG, "cursor imageview width=" + bottomLineWidth);
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int screenW = dm.widthPixels;
        offset = (int) ((screenW / 4.0 - bottomLineWidth) / 2);
        Log.i("MainActivity", "offset=" + offset);

        position_one = (int) (screenW / 4.0);
        position_two = position_one * 2;
        position_three = position_one * 3;
    }

    public class MyOnClickListener implements View.OnClickListener {
        private int index = 0;

        public MyOnClickListener(int i) {
            index = i;
        }

        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(index);
        }
    };

    public class MyOnPageChangeListener implements OnPageChangeListener {

        @Override
        public void onPageSelected(int arg0) {
            Animation animation = null;
            switch (arg0) {
            case 0:
                if (currIndex == 1) {
                    animation = new TranslateAnimation(position_one, 0, 0, 0);
                    tvTabGroups.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 2) {
                    animation = new TranslateAnimation(position_two, 0, 0, 0);
                    tvTabFriends.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 3) {
                    animation = new TranslateAnimation(position_three, 0, 0, 0);
                    tvTabChat.setTextColor(resources.getColor(R.color.lightwhite));
                }
                tvTabActivity.setTextColor(resources.getColor(R.color.white));
                break;
            case 1:
                if (currIndex == 0) {
                    animation = new TranslateAnimation(0, position_one, 0, 0);
                    tvTabActivity.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 2) {
                    animation = new TranslateAnimation(position_two, position_one, 0, 0);
                    tvTabFriends.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 3) {
                    animation = new TranslateAnimation(position_three, position_one, 0, 0);
                    tvTabChat.setTextColor(resources.getColor(R.color.lightwhite));
                }
                tvTabGroups.setTextColor(resources.getColor(R.color.white));
                break;
            case 2:
                if (currIndex == 0) {
                    animation = new TranslateAnimation(0, position_two, 0, 0);
                    tvTabActivity.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 1) {
                    animation = new TranslateAnimation(position_one, position_two, 0, 0);
                    tvTabGroups.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 3) {
                    animation = new TranslateAnimation(position_three, position_two, 0, 0);
                    tvTabChat.setTextColor(resources.getColor(R.color.lightwhite));
                }
                tvTabFriends.setTextColor(resources.getColor(R.color.white));
                break;
            case 3:
                if (currIndex == 0) {
                    animation = new TranslateAnimation(0, position_three, 0, 0);
                    tvTabActivity.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 1) {
                    animation = new TranslateAnimation(position_one, position_three, 0, 0);
                    tvTabGroups.setTextColor(resources.getColor(R.color.lightwhite));
                } else if (currIndex == 2) {
                    animation = new TranslateAnimation(position_two, position_three, 0, 0);
                    tvTabFriends.setTextColor(resources.getColor(R.color.lightwhite));
                }
                tvTabChat.setTextColor(resources.getColor(R.color.white));
                break;
            }
            currIndex = arg0;
            animation.setFillAfter(true);
            animation.setDuration(300);
            ivBottomLine.startAnimation(animation);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    }
}

TestFragment
获取Fragment对应的布局，并且设置相应的参数。

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
 
package com.aven.qqdemo;

import com.demo.R;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class TestFragment extends Fragment {
    private static final String TAG = "TestFragment";
    private String hello;// = "hello android";
    private String defaultHello = "default value";

    static TestFragment newInstance(String s) {
        TestFragment newFragment = new TestFragment();
        Bundle bundle = new Bundle();
        bundle.putString("hello", s);
        newFragment.setArguments(bundle);
        return newFragment;

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "TestFragment-----onCreate");
        Bundle args = getArguments();
        hello = args != null ? args.getString("hello") : defaultHello;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        Log.d(TAG, "TestFragment-----onCreateView");
        View view = inflater.inflate(R.layout.lay1, container, false);
        TextView viewhello = (TextView) view.findViewById(R.id.tv_hello);
        viewhello.setText(hello);
        return view;

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "TestFragment-----onDestroy");
    }

}

MyFragmentPagerAdapter
对包含Fragment对象的容器进行适配。

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
package com.aven.qqdemo;

import java.util.ArrayList;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

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);
    }

}
【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/daishuguang/p/3888622.html