191.m1-Fragment页面优化，继承BaseFragment

之前将Fragment页面的加载都写在HomeFrament中，现在进行优化，页面的显示和数据的加载都统一初始化，创建2个abstract方法，一个是加载数据的返回值，一个是显示加载成功的界面，这两个都需要单独写

BaseFragment.java

package com.ldw.market.fragment;import com.ldw.market.R;import com.ldw.market.utils.ViewUtils;import android.os.Bundle;import android.os.SystemClock;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.FrameLayout;import android.widget.FrameLayout.LayoutParams;public abstract class BaseFragment extends Fragment {//初始化页面加载的5种状态public static final int STATE_UNKOWN = 0;public static final int STATE_LOADING = 1;public static final int STATE_ERROR = 2;public static final int STATE_EMPTY = 3;public static final int STATE_SUCCESS = 4;public int state = STATE_UNKOWN;private View loadingView;// 加载中的界面private View errorView;// 错误界面private View emptyView;// 空界面private View successView;// 加载成功的界面private FrameLayout frameLayout;//创建一个View对象@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {if(frameLayout == null){frameLayout = new FrameLayout(getActivity());init(); // 在FrameLayout中 添加4种不同的界面：加载中, 加载错误,加载为空 ,加载成功}else{ViewUtils.removeParent(frameLayout);}//show();// 根据服务器的数据 切换状态return frameLayout;}// 在FrameLayout中 添加4种不同的界面：加载中, 加载错误,加载为空 ,加载成功private void init() {// 创建了加载中的界面loadingView = createLoadingView(); if (loadingView != null) {frameLayout.addView(loadingView, new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));}// 加载错误界面errorView = createErrorView(); if (errorView != null) {frameLayout.addView(errorView, new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));}// 加载空的界面emptyView = createEmptyView(); if (emptyView != null) {frameLayout.addView(emptyView, new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));}// 根据不同的状态显示不同的界面showPage();}//根据不同的状态显示不同的界面private void showPage(){//利用||,显示加载界面if (loadingView != null) {loadingView.setVisibility(state == STATE_UNKOWN|| state == STATE_LOADING ? View.VISIBLE : View.INVISIBLE);}//利用||,显示错误界面if (errorView != null) {errorView.setVisibility(state == STATE_ERROR ? View.VISIBLE: View.INVISIBLE);}//利用||,显示空界面if (emptyView != null) {emptyView.setVisibility(state == STATE_EMPTY ? View.VISIBLE: View.INVISIBLE);}if (state == STATE_SUCCESS) {//创建成功的时候加载成功页面successView = createSuccessView();if (successView != null) {frameLayout.addView(successView, new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));successView.setVisibility(View.VISIBLE);}}else{//不成功的时候让页面隐藏if(successView != null){successView.setVisibility(View.INVISIBLE);}}}//加载成功的界面public abstract View createSuccessView();/* 创建加载中的界面 */private View createErrorView() {View view = View.inflate(getActivity(), R.layout.loadpage_error, null);//点击按钮重新请求服务器更新界面Button page_bt = (Button) view.findViewById(R.id.page_bt);page_bt.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {show();}});return view;}/* 加载错误界面 */private View createEmptyView() {View view = View.inflate(getActivity(), R.layout.loadpage_empty, null);return view;}/* 加载空的界面 */private View createLoadingView() {View view = View.inflate(getActivity(), R.layout.loadpage_loading, null);return view;}//更具服务器获取的状态显示界面public void show() {//更新状态，当加载错误以后或者加载了空页面时候需要更新一下状态if (state == STATE_ERROR || state == STATE_EMPTY) {state = STATE_LOADING;}// 请求服务器 获取服务器上数据 进行判断// 请求服务器 返回一个结果//子线程中请求服务器，同时休眠一下new Thread() {public void run() {//休眠2sSystemClock.sleep(2000);final LoadResult result = load();if (getActivity() != null) {//主线程刷新界面getActivity().runOnUiThread(new Runnable() {@Overridepublic void run() {if(result != null){//更新状态state = result.getValue();//更新界面showPage();}}});}};}.start();showPage();}//服务器返回的数据protected abstract LoadResult load();//服务器返回的枚举结果，来显示界面public enum LoadResult{error(2), empty(3), success(4);int value;//获取服务器返回的结果LoadResult(int value) {this.value = value;}//获取到valuepublic int getValue() {return value;}}}

HomeFragment.java

package com.ldw.market.fragment;import com.ldw.market.R;import com.ldw.market.fragment.BaseFragment.LoadResult;import com.ldw.market.utils.ViewUtils;import android.os.Bundle;import android.os.SystemClock;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.FrameLayout;import android.widget.FrameLayout.LayoutParams;import android.widget.TextView;/* * Home页面，主体的加载的几个页面和服务器请求数据都是在BaseFragment中去实现 */public class HomeFragment extends BaseFragment {// 当Fragment挂载的activity创建的时候调用@Overridepublic void onActivityCreated(Bundle savedInstanceState) {super.onActivityCreated(savedInstanceState);show();}public View createSuccessView() {TextView tv = new TextView(getActivity());tv.setText("加载成功了....");tv.setTextSize(30);return tv;}@Overridepublic LoadResult load() {// TODO Auto-generated method stubreturn LoadResult.success;}}

MainActivity.java

package com.ldw.market;import com.ldw.market.fragment.AppFragment;import com.ldw.market.fragment.BaseFragment;import com.ldw.market.fragment.FragmentFactory;import com.ldw.market.fragment.HomeFragment;import com.ldw.market.utils.UiUtils;import junit.framework.AssertionFailedError;import android.annotation.SuppressLint;import android.content.Intent;import android.os.Bundle;import android.support.v4.app.ActionBarDrawerToggle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentStatePagerAdapter;import android.support.v4.app.FragmentTransaction;import android.support.v4.view.PagerTabStrip;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.support.v4.widget.DrawerLayout;import android.support.v7.app.ActionBar;import android.support.v7.app.ActionBar.Tab;import android.support.v7.app.ActionBar.TabListener;import android.support.v7.app.ActionBarActivity;import android.support.v7.widget.SearchView;import android.support.v7.widget.SearchView.OnQueryTextListener;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Toast;public class MainActivity extends BaseActivity implements OnQueryTextListener{private DrawerLayout mDrawerLayout;private ActionBarDrawerToggle drawerToggle;private ViewPager mViewPager;private PagerTabStrip pager_tab_strip;private String[] tab_names;  // 标签的名字    //加载字符串数组，初始化Tab@Overrideprotected void init() {tab_names = UiUtils.getStringArray(R.array.tab_names);}    //初始化ActionBar@Override    protected void initActionBar() {    //添加tab标签名        ActionBar actionBar = getSupportActionBar();       //让拉出显示详情的图片显示，可以拉出详情actionBar.setDisplayHomeAsUpEnabled(true);//让按键点击有效actionBar.setHomeButtonEnabled(true);//ActionBarDrawerToggle是ActionBar控制抽屉，//参数1：当前actionBar的Activity,参数2：控制的抽屉，参数3：按钮的图片，参数4和5是描述drawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, R.drawable.ic_drawer_am, R.string.open_drawer,R.string.close_drawer){@Overridepublic void onDrawerClosed(View drawerView) {super.onDrawerClosed(drawerView);Toast.makeText(getApplicationContext(), "抽屉关闭了", 0).show();}@Overridepublic void onDrawerOpened(View drawerView) {super.onDrawerOpened(drawerView);Toast.makeText(getApplicationContext(), "抽屉打开了", 0).show();}};//设置监听DrawerListenermDrawerLayout.setDrawerListener(drawerToggle);//  让开关和actionbar建立关系 drawerToggle.syncState();}        //初始化界面@Override    protected void initView(){    setContentView(R.layout.activity_main);    mDrawerLayout = (DrawerLayout) findViewById(R.id.dl);        mViewPager=(ViewPager) findViewById(R.id.vp);        pager_tab_strip = (PagerTabStrip) findViewById(R.id.pager_tab_strip);        //  设置标签下划线的颜色        pager_tab_strip.setTabIndicatorColor(getResources().getColor(R.color.indicatorcolor));                mViewPager.setAdapter(new MainAdapter(getSupportFragmentManager()));        //监听ViewPager，tab改变的时候改变界面        mViewPager.setOnPageChangeListener(new OnPageChangeListener(){@Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {// TODO Auto-generated method stub}//条目被选中的时候，更新服务器状态，重新显示界面@Overridepublic void onPageSelected(int position) {BaseFragment createFragment = FragmentFactory.createFragment(position);createFragment.show();}                });    }        //可以继承PageAapter实现ViePager翻页现在继承FragmentStatePagerAdapter可以实现fragement    private class MainAdapter extends FragmentStatePagerAdapter{public MainAdapter(FragmentManager fm) {super(fm);// TODO Auto-generated constructor stub}//每一个条目返回的fragment@Overridepublic Fragment getItem(int position) {//  通过Fragment工厂  生产Fragment   return FragmentFactory.createFragment(position);}//条目的总数@Overridepublic int getCount() {// TODO Auto-generated method stubreturn tab_names.length;}// 返回每个条目的标题，设置tab的标签@Overridepublic CharSequence getPageTitle(int position) {return tab_names[position];}        }        //初始化ActionBar的界面    @SuppressLint("NewApi") @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        // 如果运行的环境 (部署到什么版本的手机 )大于3.0，低版本的不支持        if (android.os.Build.VERSION.SDK_INT > 11) {        SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();searchView.setOnQueryTextListener(this);// 搜索的监听 }          return true;    }        public void click(View v){    Intent intent = new Intent(getApplicationContext(), DetailActivity.class);    startActivity(intent);    }        /** 处理actionBar菜单条目的点击事件 */    @Overridepublic boolean onOptionsItemSelected(MenuItem item) {System.out.println("所有");//当前点击的条目是searchif (item.getItemId() == R.id.action_search) {Toast.makeText(getApplicationContext(), "搜索", 0).show();}//优先处理drawerToggle的点击，drawerToggle出不不了交给父类return drawerToggle.onOptionsItemSelected(item)|super.onOptionsItemSelected(item);}// 当搜索提交的时候@Overridepublic boolean onQueryTextChange(String arg0) {Toast.makeText(getApplicationContext(), arg0, 0).show();return false;}// 当搜索的文本发生变化@Overridepublic boolean onQueryTextSubmit(String arg0) {Toast.makeText(getApplicationContext(), arg0, 0).show();return false;}    }