对于Android的一些知识点了解一点以后，对整个项目的业务逻辑进行一遍梳理。
校园新闻APP的登录注册
首先在MainActivity中设置登录和注册按钮的点击事件，用户点击后分别跳转到相关Activity中。
所有的Activity类都继承一个BaseActivity类，在BaseActivity类中定义一些抽象的方法比如：初始化布局，初始化控件，对数据的封装，事件，接口进行操作。
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| public abstract class BaseActivity extends AppCompatActivity {
public Context mContext;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext = this;
setContentView(initLayout());
initView();
initData();
}
protected abstract int initLayout();
protected abstract void initView();
protected abstract void initData();
public void showToast(String msg) {
Toast.makeText(mContext, msg, Toast.LENGTH_SHORT).show();
}
public void showToastSync(String msg) {
Looper.prepare();
Toast.makeText(mContext, msg, Toast.LENGTH_SHORT).show();
Looper.loop();
}
public void navigateTo(Class cls) {
Intent in = new Intent(mContext, cls);
startActivity(in);
}
public void navigateToWithBundle(Class cls, Bundle bundle) {
Intent in = new Intent(this, cls);
in.putExtras(bundle);
startActivity(in);
}
public void navigateToWithFlag(Class cls, int flags) {
Intent in = new Intent(mContext, cls);
in.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(in);
}
protected void insertVal(String key, String val) {
SharedPreferences sp = getSharedPreferences("sp_ttit", MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString(key, val);
editor.commit();
}
protected String findByKey(String key) {
SharedPreferences sp = getSharedPreferences("sp_ttit", MODE_PRIVATE);
return sp.getString(key, "");
}
}
|
在LoginActivity中发送请求，请求响应成功后进入主页面。
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| HashMap<String, Object> params = new HashMap<String, Object>();
params.put("username", account);
params.put("password", pwd);
Api.config(ApiConfig.LOGIN, params).postRequest(this, new TtitCallback() {
@Override
public void onSuccess(final String res) {
Log.e("onSuccess", res);
Gson gson = new Gson();
LoginResponse loginResponse = gson.fromJson(res, LoginResponse.class);
Log.e("token",loginResponse.getData().getToken());
Log.e("code",loginResponse.getCode());
if (loginResponse.getCode().equals("200")) {
String token = loginResponse.getData().getToken();
insertVal("token", token);
insertVal("userid", String.valueOf(loginResponse.getData().getId()));
Log.e("token",token);
navigateToWithFlag(HomeActivity.class,
Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
showToastSync("登录成功");
} else {
showToastSync("登录失败");
}
}
@Override
public void onFailure(Exception e) {
}
});
|
校园新闻主页面
用户登录成功以后，跳转到HomeActivity中，HomeActivity之中添加了两个fragment，一个是新闻首页，另一个是我的信息页面。
在HomeActivity中的xml布局文件中设置一个重写的ViewPager关闭了动画滑动效果：FixedViewPager。
使用了一个开源组件FlycoTabLayout。
- CommonTabLayout:不同于SlidingTabLayout对ViewPager依赖,它是一个不依赖ViewPager可以与其他控件自由搭配使用的TabLayout.实现底部导航
- SlidingTabLayout: 关联ViewPager,实现新闻的分类。
底部导航的数据适配器为MyPagerAdapter
顶部到导航Tab的数据适配器为homeFragment的HomeAdapter
HomeActivity布局文件
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tl="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:orientation="vertical"
tools:context=".activity.HomeActivity">
<com.zwj.news.view.FixedViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/divider" />
<com.flyco.tablayout.CommonTabLayout
android:id="@+id/commonTabLayout"
android:layout_width="match_parent"
android:layout_height="66dp"
android:background="#ffffff"
tl:tl_iconHeight="30dp"
tl:tl_iconWidth="30dp"
tl:tl_indicator_color="#2C97DE"
tl:tl_indicator_height="0dp"
tl:tl_textSelectColor="#0025ff"
tl:tl_textUnselectColor="#454544"
tl:tl_textsize="14sp"
tl:tl_underline_color="#DDDDDD"
tl:tl_underline_height="1dp" />
</LinearLayout>
|
HomeActivity的Activity文件
根据底部Tab导航添加两个Fragments到HomeActivity中，并且添加viewPage相关的MyPagerAdapter。
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| public class HomeActivity extends BaseActivity {
private String[] mTitles = {"首页", "我的"};
private int[] mIconUnselectIds = {
R.mipmap.home_unselect, R.mipmap.collect_unselect,
R.mipmap.my_unselect};
private int[] mIconSelectIds = {
R.mipmap.home_selected, R.mipmap.collect_selected,
R.mipmap.my_selected};
private ArrayList<Fragment> mFragments = new ArrayList<>();
private ArrayList<CustomTabEntity> mTabEntities = new ArrayList<>();
private ViewPager viewPager;
private CommonTabLayout commonTabLayout;
@Override
protected int initLayout() {
return R.layout.activity_home;
}
@Override
protected void initView() {
viewPager = findViewById(R.id.viewpager);
commonTabLayout = findViewById(R.id.commonTabLayout);
}
@Override
protected void initData() {
mFragments.add(HomeFragment.newInstance());
mFragments.add(MyFragment.newInstance());
for (int i = 0; i < mTitles.length; i++) {
mTabEntities.add(new TabEntity(mTitles[i], mIconSelectIds[i], mIconUnselectIds[i]));
}
commonTabLayout.setTabData(mTabEntities);
commonTabLayout.setOnTabSelectListener(new OnTabSelectListener() {
@Override
public void onTabSelect(int position) {
viewPager.setCurrentItem(position);
}
@Override
public void onTabReselect(int position) {
}
});
viewPager.setOffscreenPageLimit(mFragments.size());
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
commonTabLayout.setCurrentTab(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
viewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager(), mTitles, mFragments));
}
}
|
底部导航的Adapter文件
主要实现底部导航切换viewPage的adapter
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| public class MyPagerAdapter extends FragmentPagerAdapter {
private String[] mTitles;
private ArrayList<Fragment> mFragments;
public MyPagerAdapter(FragmentManager fm, String[] titles, ArrayList<Fragment> fragments) {
super(fm);
this.mTitles = titles;
this.mFragments = fragments;
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mTitles[position];
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
}
|
HomeFragment的Fragment
在HomeFragment中实现新闻分类的功能，一个viewpage就是一个分类新闻。向后端发送请求，根据获得的分类id创建新闻分类的数组。viewPage动态的添加新闻的Fragment。
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| private void getVideoCategoryList() {
HashMap<String, Object> params = new HashMap<>();
Api.config(ApiConfig.News_CATEGORY_LIST, params).getRequest(getActivity(), new TtitCallback() {
@Override
public void onSuccess(final String res) {
Log.e("News_CATEGORY_LIST",res);
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
CategoryListResponse response = new Gson().fromJson(res, CategoryListResponse.class);
if (response != null && response.getCode().equals("200")) {
List<CategoryEntity> list = response.getData();
if (list != null && list.size() > 0) {
mTitles = new String[list.size()];
for (int i = 0; i < list.size(); i++) {
mTitles[i] = list.get(i).getType();
mFragments.add(NewsFragment.newInstance(list.get(i).getId()));
}
viewPager.setOffscreenPageLimit(mFragments.size());
viewPager.setAdapter(new HomeAdapter(getFragmentManager(), mTitles, mFragments));
slidingTabLayout.setViewPager(viewPager);
}
}
}
});
}
@Override
public void onFailure(Exception e) {
}
});
}
|
HomeFragment的Adapter
主要实现主页面新闻分类的viewPage的数据适配器
Fragment 与 FragmentPagerAdapter
基础篇——View和ViewGroup的区别
FragmentPagerAdapter是PagerAdapter中的其中一种实现。它将每一个页面表示为一个 Fragment，并且每一个Fragment都将会保存到fragment manager当中。而且，当用户没可能再次回到页面的时候，fragment manager才会将这个Fragment销毁。
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| public class HomeAdapter extends FragmentPagerAdapter {
private String[] mTitles;
private ArrayList<Fragment> mFragments;
public HomeAdapter(FragmentManager fm, String[] titles, ArrayList<Fragment> fragments) {
super(fm);
this.mTitles = titles;
this.mFragments = fragments;
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mTitles[position];
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
}
|
HomeFragment的布局文件
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tl="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical"
tools:context=".fragment.HomeFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="115dp"
android:background="#344261"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="39dp"
android:layout_marginLeft="24dp"
android:layout_marginTop="26dp"
android:layout_marginRight="24dp"
android:background="@drawable/shape_search_box"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:layout_width="22dp"
android:layout_height="22dp"
android:layout_marginLeft="13dp"
android:src="@mipmap/search" />
<EditText
android:id="@+id/et_search"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="11dp"
android:background="@null"
android:hint="搜索新闻"
android:textColor="@color/black"
android:textColorHint="#737373"
android:textSize="15sp" />
</LinearLayout>
<com.flyco.tablayout.SlidingTabLayout
android:id="@+id/slidingTabLayout"
android:layout_width="match_parent"
android:layout_height="50dp"
tl:tl_indicator_corner_radius="1.5dp"
tl:tl_indicator_height="3dp"
tl:tl_indicator_width="17dp"
tl:tl_textSelectColor="#fdf299"
tl:tl_textUnselectColor="#ffffff"
tl:tl_indicator_color="#fdf299"
tl:tl_textsize="16sp" />
</LinearLayout>
<com.zwj.news.view.FixedViewPager
android:id="@+id/fixedViewPager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
|
校园新闻页面的展示
HomeActivity之中的homeFragment根据分类id添加的viewPage
NewsFragment布局文件
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| <com.scwang.smart.refresh.layout.SmartRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/refreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical"
app:srlEnableOverScrollDrag="false"
app:srlEnableAutoLoadMore="false"
app:srlEnableOverScrollBounce="false"
app:srlEnableLoadMoreWhenContentNotFull="false"
app:srlEnablePreviewInEditMode="true"
tools:context=".fragment.NewsFragment">
<com.scwang.smart.refresh.header.ClassicsHeader
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.scwang.smart.refresh.footer.ClassicsFooter
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.scwang.smart.refresh.layout.SmartRefreshLayout>
|
NewsFragment
RecyclerView及其子view的具体绘制工作是通过具体的LayoutManager中的onLayoutChildren和setMeasuredDimension实现的。
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| public class NewsFragment extends BaseFragment {
private int categoryId;
private String title;
private RecyclerView recyclerView;
private NewsAdapter newsAdapter;
private List<NewsEntity> datas = new ArrayList<>();
private LinearLayoutManager linearLayoutManager;
private RefreshLayout refreshLayout;
private int pageNum = 1;
public NewsFragment() {
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
newsAdapter.setDatas(datas);
newsAdapter.notifyDataSetChanged();
recyclerView.setAdapter(newsAdapter);
break;
}
}
};
public static NewsFragment newInstance(int categoryId) {
NewsFragment fragment = new NewsFragment();
fragment.categoryId = categoryId;
return fragment;
}
@Override
protected int initLayout() {
return R.layout.fragment_video;
}
@Override
protected void initView() {
recyclerView = mRootView.findViewById(R.id.recyclerView);
refreshLayout = mRootView.findViewById(R.id.refreshLayout);
}
@Override
protected void initData() {
linearLayoutManager = new LinearLayoutManager(getActivity());
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);
newsAdapter = new NewsAdapter(getActivity());
recyclerView.setAdapter(newsAdapter);
newsAdapter.setOnItemClickListener(new NewsAdapter.OnItemClickListener() {
@Override
public void onItemClick(Serializable obj) {
Log.e("点击", "点击");
NewsEntity newsEntity = (NewsEntity) obj;
String url = "http://47.116.21.234/newsDetail?newsid=" + ((NewsEntity) obj).getId() + "&userid=" + findByKey("userid");
Log.e("url", url);
Bundle bundle = new Bundle();
bundle.putString("url", url);
navigateToWithBundle(WebActivity.class, bundle);
}
});
refreshLayout.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh(@NonNull RefreshLayout refreshLayout) {
pageNum = 1;
getVideoList(true);
Log.e("刷新", pageNum + "");
}
});
refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore(@NonNull RefreshLayout refreshlayout) {
pageNum++;
getVideoList(false);
Log.e("加载", pageNum + "");
}
});
getVideoList(true);
}
private void getVideoList(final Boolean isRefresh) {
String token = findByKey("token");
if (!StringUtils.isEmpty(token)) {
HashMap<String, Object> params = new HashMap<>();
params.put("pageNum", pageNum);
params.put("pageSize", ApiConfig.PAGE_SIZE);
params.put("title", "");
params.put("categoryId", categoryId);
Api.config(ApiConfig.News_LIST_BY_CATEGORY, params).getRequest(getActivity(), new TtitCallback() {
@Override
public void onSuccess(final String res) {
if (isRefresh) {
refreshLayout.finishRefresh(true);
} else {
refreshLayout.finishLoadMore(true);
}
NewsListResponse response = new Gson().fromJson(res, NewsListResponse.class);
if (response != null && response.getCode().equals("200")) {
List<NewsEntity> list = response.getData().getRecords();
if (list != null && list.size() > 0) {
if (isRefresh) {
datas = list;
} else {
datas.addAll(list);
}
mHandler.sendEmptyMessage(0);
} else {
if (isRefresh) {
Log.e("暂时无数据", "暂时无数据");
showToastSync("暂时无数据");
} else {
Log.e("没有更多数据了", "没有更多数据了");
showToastSync("没有更多数据了");
}
}
}
}
@Override
public void onFailure(Exception e) {
if (isRefresh) {
refreshLayout.finishRefresh(true);
} else {
refreshLayout.finishLoadMore(true);
}
}
});
} else {
navigateTo(LoginActivity.class);
}
}
}
|
NewsFragment的数据适配器
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| public class NewsAdapter extends RecyclerView.Adapter<ViewHolder> {
private Context mContext;
private List<NewsEntity> datas;
private static OnItemClickListener mOnItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
mOnItemClickListener = onItemClickListener;
}
public NewsAdapter(Context mContext) {
this.mContext = mContext;
}
public void setDatas(List<NewsEntity> datas) {
this.datas = datas;
}
public NewsAdapter(Context context, List<NewsEntity> datas) {
this.mContext = context;
this.datas = datas;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.item_video_layout, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
ViewHolder vh = (ViewHolder) holder;
NewsEntity newsEntity = datas.get(position);
vh.tvTitle.setText(newsEntity.getTitle());
vh.tvAuthor.setText(newsEntity.getUser().getNickname());
vh.newsEntity=newsEntity;
Picasso.with(mContext).load(newsEntity.getCoverimg()).placeholder(R.mipmap.load).error(R.mipmap.bad).into(vh.imageViewCover);
Picasso.with(mContext).load(newsEntity.getUser().getAvatarUrl()).transform(new CircleTransform()).placeholder(R.mipmap.header).error(R.mipmap.header).into(vh.imageViewHeard);
}
@Override
public int getItemCount () {
if (datas != null && datas.size() > 0) {
return datas.size();
} else {
return 0;
}
}
public Context getmContext() {
return mContext;
}
public List<NewsEntity> getDatas() {
return datas;
}
static class ViewHolder extends RecyclerView.ViewHolder {
private TextView tvTitle;
private TextView tvAuthor;
private TextView tvDz;
private TextView tvComment;
private TextView tvCollect;
private ImageView imageViewCover;
private ImageView imageViewHeard;
private NewsEntity newsEntity;
private ImageView imgCollect;
private ImageView imageDZ;
public ViewHolder(@NonNull View view) {
super(view);
tvTitle = view.findViewById(R.id.title);
tvAuthor = view.findViewById(R.id.author);
imageViewCover=view.findViewById(R.id.img_cover);
imageViewHeard=view.findViewById(R.id.img_header);
imgCollect=view.findViewById(R.id.img_collect);
view.setTag(this);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mOnItemClickListener.onItemClick(newsEntity);
}
});
}
}
public interface OnItemClickListener {
void onItemClick(Serializable obj);
}
}
|
NewsFragment的item布局文件
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="21dp"
android:paddingTop="13dp"
android:paddingRight="21dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="42dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/img_header"
android:layout_width="42dp"
android:layout_height="42dp"
android:src="@mipmap/header" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="11dp">
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="韭菜盒子新做法，不发面不烫面"
android:textColor="#242424"
android:textSize="14sp" />
<TextView
android:id="@+id/author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="大胃王"
android:textColor="#9f9f9f"
android:textSize="12sp" />
</RelativeLayout>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="187dp"
android:layout_marginTop="8dp">
<ImageView
android:id="@+id/img_cover"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="@mipmap/default_bg" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="39dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:orientation="horizontal">
<ImageView
android:id="@+id/img_comment"
android:layout_width="19dp"
android:layout_height="19dp"
android:src="@mipmap/comment" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="7dp"
android:background="#f5f5f4" />
</LinearLayout>
|
