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：

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。

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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。

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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。

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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); } }