安卓初体验

   好久没写博客了，最近一个月终于学习安卓了，实在是已经无力写博客了，印象中安卓应该是比JAVA高深100倍啊有莫有，结果却是比css还要啰嗦100倍啊，各种格式,各种上下左右，木完木了，看各种帮助文档看的想吐，学到现在已经无力吐槽了，只好又抽出为数不多的时间再去坚定自己的信心，好了废话不多说，最近在仿造今日头条客户端，接下来几个帖子写一下我从中学到的几个小小小知识：

1.下面完成的功能是

package com.jerehedu.todaynews;

import java.util.ArrayList;

import com.jerehedu.adapter.NewsPagerAdapter; import com.jerehedu.enteiy.ChannelItem; import com.jerehedu.fragment.NewsFragment;

import com.jerehedu.other.ViewDisplayTool;

import com.jerehedu.todaynews.R.color;

import android.app.Activity;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.Window;

import android.widget.HorizontalScrollView;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.LayoutParams;

import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends FragmentActivity {

 //频道分类容器

 private ViewPager viewPager;  

private RadioGroup tabContainer;  

private ArrayList<ChannelItem> defaultChannels;

 private int channelItemWidth;

 private HorizontalScrollView topCategoryScoll;

    protected void onCreate(Bundle savedInstanceState) {    

     super.onCreate(savedInstanceState);     

    requestWindowFeature(Window.FEATURE_NO_TITLE);  

       setContentView(R.layout.activity_main);          

      initView();   setContent();   

  }     public void setContent() {

  initTabData();  

 initTab();

  initViewPager();

 }       

  private void initView() {  

 tabContainer = (RadioGroup) findViewById(R.id.tabColContainer);

  channelItemWidth = ViewDisplayTool.getWindowWidth(this) / 7;

  topCategoryScoll = (HorizontalScrollView) findViewById(R.id.topcategoryscroll);

  viewPager = (ViewPager) findViewById(R.id.view_pager123);  }   

  /**   * 初始化频道数据   */   

   private void initTabData() {  

 defaultChannels = new ArrayList<ChannelItem>();   

defaultChannels.add(new ChannelItem(1, "推荐", 1, 1, 1));   

defaultChannels.add(new ChannelItem(2, "热点", 2, 1));  

 defaultChannels.add(new ChannelItem(3, "烟台", 3, 1));

  defaultChannels.add(new ChannelItem(4, "时尚", 4, 1));

  defaultChannels.add(new ChannelItem(5, "科技", 5, 1));

  defaultChannels.add(new ChannelItem(6, "体育", 6, 1));  

 defaultChannels.add(new ChannelItem(7, "军事", 7, 1));   

defaultChannels.add(new ChannelItem(8, "NBA", 8, 1));

  defaultChannels.add(new ChannelItem(9, "CBA", 9, 1));  }