android 应用架构随笔六（Loading加载页面）

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import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import com.heima.googleplay.R; import com.heima.googleplay.manager.ThreadManager; import com.heima.googleplay.utils.UIUtils; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.widget.FrameLayout; /** * * * ============================================================ **/ public abstract class LoadingPage extends FrameLayout { //默认状态 private final int UN_LOADING=1; //加载状态 private final int LOADING = 2; //加载失败状态 private final int ERROR = 3; //加载成功。然后服务器没有返回数据 private final int EMPTY = 4; //加载成功的状态 private final int SUCCESS = 5; //用来记录某种状态 private int mState; private View mLoadingView; private View mErrorView; private View mEmptyView; private View mSuccessView; public LoadingPage(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); }private void init() { //首先赋值 mState = UN_LOADING; mLoadingView = createLoadingView(); if(null != mLoadingView){ addView(mLoadingView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); }mErrorView = createErrorView(); if(null != mErrorView){ addView(mErrorView,new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); }mEmptyView = createEmptyView(); if(null != mEmptyView ){ addView(mEmptyView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); } //成功页面根据业务不同页面将不同，所以在此无法添加统一界面
//只能在主线程中展示出来 showSafePage(); }
private void showSafePage() { UIUtils.runInMainThread(new Runnable() {@Override public void run() { showPage(); } }); }
//三种页面已经添加到FrameLayout中，通过显示和隐藏来控制显示那个 protected void showPage() { if(null != mLoadingView){ mLoadingView.setVisibility(mState == UN_LOADING || mState ==LOADING ? View.VISIBLE : View.INVISIBLE); }if(null != mErrorView){ mErrorView.setVisibility(mState == ERROR ? View.VISIBLE : View.INVISIBLE); }if(null != mEmptyView){ mEmptyView.setVisibility(mState == EMPTY ? View.VISIBLE : View.INVISIBLE); }if(null == mSuccessView & & mState == SUCCESS ){ mSuccessView = createSuccessView(); addView(mSuccessView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); } if(null != mSuccessView){ mSuccessView.setVisibility(mState == SUCCESS ? View.VISIBLE : View.INVISIBLE); } }public abstract View createSuccessView(); //创建成功后显示的业务界面private View createEmptyView() { // TODO Auto-generated method stub return UIUtils.inflate(R.layout.loading_page_empty); }private View createErrorView() { // TODO Auto-generated method stub return UIUtils.inflate(R.layout.loading_page_error); }private View createLoadingView() { // TODO Auto-generated method stub return UIUtils.inflate(R.layout.loading_page_loading); }public LoadingPage(Context context, AttributeSet attrs) { super(context, attrs); init(); }public LoadingPage(Context context) { super(context); init(); } ////加载失败状态 //private final int ERROR = 3; ////加载成功。然后服务器没有返回数据 //private final int EMPTY = 4; ////加载成功的状态 //private final int SUCCESS = 5; public enum LoadResult{ ERROR(3),EMPTY(4),SUCCESS(5); int value ; LoadResult(int value){ this.value = https://www.songbingjia.com/android/value; } public int getValue() { return value; } }
//利用线程池 private class LoadTask implements Runnable{@Override public void run() { final LoadResult result = Load(); UIUtils.runInMainThread(new Runnable() {@Override public void run() {mState = result.getValue(); showPage(); } }); }}public void show() { if(mState == ERROR || mState == EMPTY){ mState = UN_LOADING; }if(mState == UN_LOADING){ mState = LOADING; LoadTask task = new LoadTask(); ThreadManager.getLongPool().execute(task); //ExecutorService service = Executors.newFixedThreadPool(3); //LoadTask task = new LoadTask(); //service.execute(task); } showSafePage(); //加载完数据，在主线程中展示界面出来

}

//从服务器加载数据，返回加载状态（加载数据成功、失败？） public abstract LoadResult Load() ; }

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import java.util.List; import com.heima.googleplay.utils.UIUtils; import com.heima.googleplay.utils.ViewUtils; import com.heima.googleplay.widget.LoadingPage; import com.heima.googleplay.widget.LoadingPage.LoadResult; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewParent; public abstract class BaseFragment extends Fragment {private LoadingPage mContentPage; //setContentView @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { //当前的view已经有了一个父亲。必须移除 if(mContentPage == null){ mContentPage = new LoadingPage(UIUtils.getContext()) {@Override public View createSuccessView() { // TODO Auto-generated method stub return BaseFragment.this.createSuccessView(); }@Override public LoadResult Load() { // TODO Auto-generated method stub return BaseFragment.this.load(); } }; }else{ ViewUtils.removeSelfFromParent(mContentPage); }return mContentPage; } /** * 检查服务器返回的json数据 * @param object * @return */ protected LoadResult chece(Object object) { if (object == null) { return LoadResult.ERROR; } if (object instanceof List) { List list = (List) object; if (list.size() == 0) { return LoadResult.EMPTY; } }return LoadResult.SUCCESS; }protected abstract LoadResult load(); protected abstract View createSuccessView(); //在MainActivity中调用 public void show() { if (null != mContentPage) { mContentPage.show(); }}}

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import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.Menu; import com.heima.googleplay.fragment.AppFragment; import com.heima.googleplay.fragment.BaseFragment; import com.heima.googleplay.fragment.FragmentFactory; import com.heima.googleplay.fragment.GameFragment; import com.heima.googleplay.fragment.HomeFragment; import com.heima.googleplay.utils.UIUtils; import com.heima.googleplay.widget.PagerTab; public class MainActivity extends BaseActivity implements OnPageChangeListener {private PagerTab mTabs; private ViewPager mPager; @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); return true; }private class MainAdapter extends FragmentStatePagerAdapter{private String[] tab_names; private BaseFragment fragment; public MainAdapter(FragmentManager fm) { super(fm); tab_names = UIUtils.getStringArray(R.array.tab_names); }@Override public CharSequence getPageTitle(int position) { // TODO Auto-generated method stub return tab_names[position]; }@Override public Fragment getItem(int position) {return FragmentFactory.createFragment(position); }@Override public int getCount() { // TODO Auto-generated method stub return tab_names.length; }}@Override protected void initView() { setContentView(R.layout.activity_main); mTabs = (PagerTab) findViewById(R.id.tabs); mPager = (ViewPager) findViewById(R.id.pager); MainAdapter adapter = new MainAdapter(getSupportFragmentManager()); mPager.setAdapter(adapter); //绑定到一起 mTabs.setViewPager(mPager); mTabs.setOnPageChangeListener(this); }@Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub}@Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub}@Override public void onPageSelected(int arg0) { BaseFragment fragment = FragmentFactory.createFragment(arg0); fragment.show(); }}

MainActivity 【android 应用架构随笔六（Loading加载页面）】