尚硅谷-杨光福-北京新闻day4.docx

新闻客户端讲师：杨光福微博：/321chinavideo Day41_自定义ListView(加载更多)-4201_添加角布局 1_初始化和隐藏代码在RefreshListView构造方法中调用/* * 添加角布局 * param context */private void initFooterView(Context context) View footerView = View.inflate(context, R.layout.refresh_listview_footer, null);/隐藏代码footerView.measure(0, 0);int footerViewHeight = footerView.getMeasuredHeight();footerView.setPadding(0, -footerViewHeight, 0, 0);this.addFooterView(footerView);2_布局文件refresh_listview_footer.xml 02_拖动到底部的时候显示角1_拖动到底部显示加载更多布局/* * 当滚动状态改变的时候触发此方法 * */Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) /当停止滚动时或者惯性滚动时，ListView的最后一个显示的条目：getCount()-1if(scrollState = SCROLL_STATE_IDLE|scrollState = SCROLL_STATE_FLING)if(getLastVisiblePosition() =(getCount()-1)/滑动到最后一个可以看到的ItemSystem.out.println(滑动到最后一个可以看到的Item);isLoadingMore = true;/把底部加载显示footerView.setPadding(0, 0, 0, 0);setSelection(getCount();/调用if(mOnRefreshListener !=null)mOnRefreshListener.onLoadingMore(); Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) /* * 自定义刷新接口 * */public interface OnRefreshListener/* * 当下拉刷新的时候回调这儿方法 */public void onPullDownRefresh();/* * 当加载更多的时候回调这个方法 */public void onLoadingMore();/* * 当数据请求成功或者失败的时候，状态还原 */public void onRefreshFinish(boolean isSuccess)/判断是否是加载更多if(isLoadingMore)footerView.setPadding(0, -footerViewHeight, 0, 0);isLoadingMore = false;else/隐藏下拉刷新控件refreshHeaderView.setPadding(0, -headerViewHeight, 0, 0);currentState = PULL_DOWN_REFRESH;ivArrow.clearAnimation();mProgressBar.setVisibility(View.INVISIBLE);ivArrow.setVisibility(View.VISIBLE);tvState.setText(下拉刷新);if(isSuccess)/设置更新时间tvTime.setText(最后刷新的时间:+getSystemTime(); 2_联网请求加载更多数据 /* * 菜单页面对应的新闻页签页面 * 总共有12个 * author Administrator * */public class TabMenuDetailPager extends MenuDetailBasePager implements OnPageChangeListener /* * 新闻中心-新闻菜单对应的标签对应的数据 */private NewCenterTag newCenterTag;./* * 加载更多数据的URL */private String moreUrl; /* * 是否加载更多数据中 */protected boolean isLoadingMore = false; . Overridepublic View initView() View view = View.inflate(mActivity, R.layout.tab_detail, null);/把View注入到XUtils框架中ViewUtils.inject(this, view);./设置监听下拉刷新mListView.setOnRefreshListener(new OnRefreshListener() Overridepublic void onPullDownRefresh() isPullDownRefreshing = true;getDataFromNet(); Overridepublic void onLoadingMore() if(TextUtils.isEmpty(moreUrl)Toast.makeText(mActivity, 没有更多数据了, 1).show();mListView.onRefreshFinish(false);else/有更多数据，要加载更多数据了getMoreDataFromNet(););return view;/* * 加载更多数据 */protected void getMoreDataFromNet() HttpUtils httpUtils = new HttpUtils();httpUtils.send(HttpMethod.GET, moreUrl, new RequestCallBack() Overridepublic void onSuccess(ResponseInfo responseInfo) System.out.println(加载更多数据成功：+responseInfo.result);mListView.onRefreshFinish(false);isLoadingMore = true;processData(responseInfo.result); Overridepublic void onFailure(HttpException error, String msg) mListView.onRefreshFinish(false);System.out.println(加载更多数据失败：+ msg);); /* * 处理和解析json数据 * param json */protected void processData(String json) TabDetailBean bean = parserJson(json);if(!isLoadingMore)System.out.println(bean.data.news.get(0).title);topnews = bean.data.topnews;/给ViewPager设置适配器TabDetailAdapter adapter = new TabDetailAdapter();mViewPager.setAdapter(adapter);/ 把所有的View清除ll_point_group.removeAllViews();for(int i=0;itopnews.size();i+)View point = new View(mActivity);LayoutParams params = new LayoutParams(5, 5) ; point.setBackgroundResource(R.drawable.tab_detail_point_bg);if(i!=0)params.leftMargin = 10;point.setEnabled(false);point.setLayoutParams(params);ll_point_group.addView(point);previousPointPosition = 0;/设置默认的图片描述和指示点mtv_title_description.setText(topnews.get(previousPointPosition).title);ll_point_group.getChildAt(previousPointPosition).setEnabled(true);/设置页面改变的监听mViewPager.setOnPageChangeListener(this);/设置适配器和对应的数据newsLists = bean.data.news;listViewAdapter = new ListViewAdapter();mListView.setAdapter(listViewAdapter);/mListView.addHeaderView(v);/把一个视图一头的方式添加到ListView中else/把列表新闻取出来，在加载到以前的集合中，在刷新数据isLoadingMore = false;List moreDataNews = bean.data.news;newsLists.addAll(moreDataNews);listViewAdapter.notifyDataSetChanged();/刷新数据. /* * 用Gson开源项目解析json * param json */private TabDetailBean parserJson(String json) Gson gson = new Gson();TabDetailBean bean = gson.fromJson(json, TabDetailBean.class);moreUrl = bean.data.more;if(TextUtils.isEmpty(moreUrl)moreUrl = null;elsemoreUrl = ConstantUtils.server_url+moreUrl;return bean; Overridepublic void onPageScrollStateChanged(int arg0) / TODO Auto-generated method stub Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) / TODO Auto-generated method stub. 2_新闻详情页面-49 01_设置点击某一条后变灰色1_以数组方式记录点击后的id/* * 新闻ID数组key */private String READ_NEWS_ID_ARRAY_KEY = read_news_id_array_key; Overridepublic View initView() View view = View.inflate(mActivity, R.layout.tab_detail, null);/把View注入到XUtils框架中ViewUtils.inject(this, view);./设置点击某一条的监听mListView.setOnItemClickListener(new OnItemClickListener() Overridepublic void onItemClick(AdapterView parent, View view,int position, long id) int realPosition = position -1;News newsItem = newsLists.get(realPosition);System.out.println(标题:+newsItem.title+,id:+newsItem.id);/读取之前保存的,如果数组里面没有包含当前的id，就在之前的id数组后边加上当前的id,并且保存起来。String readNewsIdArray = CacheUitls.getString(mActivity, READ_NEWS_ID_ARRAY_KEY, );if(!readNewsIdArray.contains(newsItem.id)String currentValues = ;if(TextUtils.isEmpty(readNewsIdArray)/第一次点击，没有任何idcurrentValues = newsItem.id +, ;else/已经有id保存过了，就在末尾添加新的id,最终变成数组currentValues = readNewsIdArray + newsItem.id +, ;/把这条新闻的id存储起来CacheUitls.putString(mActivity, READ_NEWS_ID_ARRAY_KEY, currentValues);/刷新适配器listViewAdapter.notifyDataSetChanged(););return view;2_适配器里修改class ListViewAdapter extends BaseAdapter . /* * 实例每一个Item */Overridepublic View getView(int position, View convertView, ViewGroup parent) .String readNewsIdArray = CacheUitls.getString(mActivity, READ_NEWS_ID_ARRAY_KEY, );if(readNewsIdArray.contains(news.id)holder.tv_news_list_title.setTextColor(Color.GRAY);elseholder.tv_news_list_title.setTextColor(Color.BLACK);return view;02_新闻详情页面1_创建新闻详情页面NewsDetailActivity数据接收1_创建新闻详情页面/* * 新闻详情页面 * author Administrator * */public class NewsDetailActivity extends Activity Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);String url = getIntent().getStringExtra(url);System.out.println(url:+url); 2_在功能清单文件注册和数据的传递 /进入新闻详情页面Intent intent = new Intent(mActivity,NewsDetailActivity.class);intent.putExtra(url, newsItem.url);mActivity.startActivity(intent); 2_创建新闻详情页面布局文件1_详情页面布局文件activity_news_detail.xml 2_基于title_bar.xml修改 3_NewsDetailActivity代码初始化布局文件 /* * 新闻详情页面 * author Administrator * */public class NewsDetailActivity extends Activity implements OnClickListener private String url; Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_news_detail);url = getIntent().getStringExtra(url);initView(); /* * 初始化View */private void initView() /设置隐藏findViewById(R.id.ib_content_fragment).setVisibility(View.GONE);findViewById(R.id.tv_content_fragment).setVisibility(View.GONE);/设置显示findViewById(R.id.ib_content_back).setVisibility(View.VISIBLE);findViewById(R.id.ib_title_bar_text_size).setVisibility(View.VISIBLE);findViewById(R.id.ib_title_bar_share).setVisibility(View.VISIBLE);/设置点击事件findViewById(R.id.ib_content_back).setOnClickListener(this);findViewById(R.id.ib_title_bar_text_size).setOnClickListener(this);findViewById(R.id.ib_title_bar_share).setOnClickListener(this);WebView webView = (WebView) findViewById(R.id.wv_news_detail_content);webView.loadUrl(url); Overridepublic void onClick(View v) switch (v.getId() case R.id.ib_content_back:/返回break;case R.id.ib_title_bar_text_size:/设置文字大小break;case R.id.ib_title_bar_share:/分享break; default:break; 4_设置加载效果1_布局文件修改 2_代码里面修改 /* * 初始化View */private void initView() /设置隐藏.final ProgressBar progressBar = (ProgressBar) findViewById(R.id.pb_news_detail);WebView webView = (WebView) findViewById(R.id.wv_news_detail_content);/设置监听页面加载完成，完成的时候吧Progerssbar隐藏调用webView.setWebViewClient(new WebViewClient() Overridepublic void onPageFinished(WebView view, String url) super.onPageFinished(view, url);progressBar.setVisibility(View.GONE););webView.loadUrl(url); 5_设置支持javaScript脚步语言 /设置WebView属性的类WebSettings setting = webView.getSettings();/设置支持javaScriptsetting.setJavaScriptEnabled(true); 6_设置支持双击缩放 1_想设置地址 Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_news_detail);url = getIntent().getStringExtra(url);url = ;initView(); 2_支持双击缩放 /设置WebView属性的类WebSettings setting = webView.getSettings();/设置支持javaScriptsetting.setJavaScriptEnabled(true);/启用页面上放大缩小按钮setting.setBuiltInZoomControls(true);/启用页面双击缩放功能setting.setUseWideViewPort(true);webView.loadUrl(url); 3_webview字体修改-19 /* * 新闻详情页面 * author 杨光福 * */public class NewsDetailActivity extends Activity implements OnClickListener /* * 加载新闻详情页面的Url */private String url;/* * 设置文字的大小，默认是正常 */private int currentSelectTextSize = 2;/* * 临时的选择字体大小 */private int tempSelectTextSize = 2;private WebSettings setting; Overridepublic void onClick(View v) switch (v.getId() case R.id.ib_content_back:/返回finish();break;case R.id.ib_news_detail_text_size:/设置文字大小showChangeTextSizeDialog();break;case R.id.ib_news_detail_text_share:/分享break; default:break; /* * 弹出改变字体大小的对话框 */private void showChangeTextSizeDialog() AlertDialog.Builder builder = new Builder(this);builder.setTitle(选择字体大小);final String items = 超大号字体,大号字体,正常字体,小号字体,超小号字体;builder.setSingleChoiceItems(items, currentSelectTextSize, new DialogInterface.OnClickListener() Overridepublic void onClick(DialogInterface dialog, int which) System.out.println(items:+itemswhich);tempSelectTextSize = which;/currentSelectTextSize = which;);builder.setPositiveButton(确定, new DialogInterface.OnClickListener() Overridepublic void onClick(DialogInterface dialog, int which) currentSelectTextSize = tempSelectTextSize;changeTextSize(currentSelectTextSize););builder.setNegativeButton(取消, null);builder.show(); /* * 设置文字的大小 * param currentSelectTextSize */protected void changeTextSize(int currentSelectTextSize) switch (currentSelectTextSize) case 0:/超大号字体setting.setTextSize(TextSize.LARGEST);break;case 1:/大号字体setting.setTextSize(TextSize