怎么在Android中实现一个购物分类效果？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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Android是什么
Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
SecondActivity.java
public class SecondActivity extends AppCompatActivity{
private ViewPager mPager;
private RadioGroup mRadioGroup;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
mPager = findViewById(R.id.pager);
mRadioGroup = findViewById(R.id.group);
mPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int position) {
Fragment fragment=null;
switch (position){
case 0:
fragment = new Afrag();
break;
case 1:
fragment = new Bfrag();
break;
case 2:
fragment = new Cfrag();
break;
}
return fragment;
}
@Override
public int getCount() {
return 3;
}
});
mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
switch (i){
case R.id.r1:
mPager.setCurrentItem(0);
break;
case R.id.r2:
mPager.setCurrentItem(1);
break;
case R.id.r3:
mPager.setCurrentItem(2);
break;
}
}
});
}
}secondActivity.xml
Afrag.java
public class Afrag extends Fragment{
private RecyclerView mRecyclerView;
public String urlString="http://www.wanandroid.com/tools/mockapi/6523/restaurants_offset_0_limit_4 ";
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = View.inflate(getActivity(), R.layout.afrag, null);
mRecyclerView = view.findViewById(R.id.rv);
initData();
return view;
}
private void initData() {
OkHttps okHttps = OkHttps.getInstance();
okHttps.doGet(urlString, new OkHttps.OkCallback() {
@Override
public void onResponse(String json) { //瀑布流
PubuBean pubuBean = new Gson().fromJson(json,PubuBean.class);
List results = pubuBean.getData();
PubuAdapter pubuAdapter = new PubuAdapter(getActivity());
pubuAdapter.setDatas(results);
mRecyclerView.setAdapter(pubuAdapter);
StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(manager);
}
@Override
public void onFailure(Exception e) {
}
});
}
}afrag.xml
PubuAdapter.java
public class PubuAdapter extends RecyclerView.Adapter{
private Context mContext;
ArrayList list;
public PubuAdapter(Context context) {
mContext = context;
list = new ArrayList<>();
}
public void setDatas(List datas) {
list.addAll(datas);
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = View.inflate(mContext, R.layout.pbitem, null);
ViewHolder holder = new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.mTextView.setText(list.get(position).getName());
Glide.with(mContext).load(list.get(position).getPic_url()).into(holder.mImageView);
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView mImageView;
TextView mTextView;
public ViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image);
mTextView = itemView.findViewById(R.id.t1);
}
}
}
Bfrag.java
public class Bfrag extends Fragment{
private RecyclerView mRecyclerView;
LeftAdapter adapter;
String urlString="http://www.zhaoapi.cn/product/getCatagory";
String urlString2="http://www.zhaoapi.cn/product/getProductCatagory";
private RecyclerView mRecyclerView2;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = View.inflate(getActivity(), R.layout.bfrag, null);//分类页面
mRecyclerView = view.findViewById(R.id.rv1); //左侧列表
mRecyclerView2 = view.findViewById(R.id.rv2); //右
initData();
return view;
}
private void initData() {
OkHttps okHttps = OkHttps.getInstance();
okHttps.doGet(urlString, new OkHttps.OkCallback() {
@Override
public void onResponse(String json) { //瀑布流
LeftBean leftBean = new Gson().fromJson(json,LeftBean.class);
List results = leftBean.getData();
adapter = new LeftAdapter(getActivity());
adapter.setDatas(results);
mRecyclerView.setAdapter(adapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false));
adapter.setOnItemClickListener(new LeftAdapter.OnItemClickListener() {
@Override
public void onItemClick(int position) {
//Toast.makeText(getActivity(),position+"",Toast.LENGTH_SHORT).show();
rigth(position);
}
});
}
@Override
public void onFailure(Exception e) {
}
});
}
public void rigth(int position){
HashMap map = new HashMap<>();
map.put("cid",position+1+"");
OkHttps.getInstance().doPost(urlString2,map,new OkHttps.OkCallback() {
@Override
public void onResponse(String json) {
RightBean rightBean = new Gson().fromJson(json,RightBean.class);
List results = rightBean.getData();
RightAdapter rightAdapter = new RightAdapter(getActivity());
rightAdapter.setDatas(results);
mRecyclerView2.setAdapter(rightAdapter);
mRecyclerView2.setLayoutManager(new GridLayoutManager(getActivity(),3));
}
@Override
public void onFailure(Exception e) {
}
});
}
}bfrag.xml
LeftAdapter.java
public class LeftAdapter extends RecyclerView.Adapter{
private Context mContext;
ArrayList list;
public LeftAdapter(Context context) {
mContext = context;
list = new ArrayList<>();
}
public void setDatas(List datas) {
list.addAll(datas);
}
public interface OnItemClickListener{ //自定义接口回调设置点击事件
void onItemClick(int position);
}
private OnItemClickListener mOnItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
mOnItemClickListener=onItemClickListener;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = View.inflate(mContext, R.layout.leftitem, null);
ViewHolder holder = new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
holder.mTextView.setText(list.get(position).getName());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position1 = holder.getLayoutPosition();
mOnItemClickListener.onItemClick(position1);
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView mTextView;
public ViewHolder(View itemView) {
super(itemView);
mTextView = itemView.findViewById(R.id.text1);
}
}
}
RightAdapter.java
public class RightAdapter extends RecyclerView.Adapter{
private Context mContext;
ArrayList list;
public RightAdapter(Context context) {
mContext = context;
list = new ArrayList<>();
}
public void setDatas(List datas) {
list.addAll(datas);
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = View.inflate(mContext, R.layout.rightitem, null);
ViewHolder holder = new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
holder.mTextView.setText(list.get(position).getName());
Glide.with(mContext).load(list.get(position).getList().get(position).getIcon()).into(holder.mImageView);
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView mImageView;
TextView mTextView;
public ViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image1);
mTextView = itemView.findViewById(R.id.text2);
}
}
}
OkHttps.java
public class OkHttps {
Handler handler;
private final OkHttpClient mOkHttpClient;
private static OkHttps mOkHttps;
private OkHttps() {
handler = new Handler(Looper.getMainLooper());
LoggingInterceptor loggingInterceptor = new LoggingInterceptor(); //日志拦截器
mOkHttpClient = new OkHttpClient.Builder()
.addInterceptor(loggingInterceptor) //设置日志拦截器
.connectTimeout(5000, TimeUnit.MILLISECONDS)
.readTimeout(5000,TimeUnit.MILLISECONDS)
.writeTimeout(5000,TimeUnit.MILLISECONDS)
.build();
}
public static OkHttps getInstance(){
if (mOkHttps==null){
synchronized (OkHttps.class){
if (mOkHttps==null){
return mOkHttps=new OkHttps();
}
}
}
return mOkHttps;
}
public interface OkCallback{
void onResponse(String json);
void onFailure(Exception e);
}
public void doPost(String url, Map map, final OkCallback okCallback){
FormBody.Builder builder = new FormBody.Builder();
if (map!=null){
for (String key:map.keySet()){
builder.add(key,map.get(key));
}
}
FormBody formBody = builder.build();
final Request request = new Request.Builder()
.post(formBody)
.url(url)
.build();
Call call = mOkHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
if (okCallback!=null){
handler.post(new Runnable() {
@Override
public void run() {
okCallback.onFailure(e);
}
});
}
}
@Override
public void onResponse(Call call, Response response) throws IOException {
try {
if (response!=null && response.isSuccessful()){
final String json = response.body().string();
handler.post(new Runnable() {
@Override
public void run() {
if (okCallback!=null){
okCallback.onResponse(json);
return;
}
}
});
}
}catch (IOException e){
e.printStackTrace();
}
if (okCallback!=null){
okCallback.onFailure(new Exception("网络异常"));
}
}
});
}
public void doGet(String url, final OkCallback okCallback){
Request request = new Request.Builder()
.url(url)
.build();
Call call = mOkHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
if (okCallback != null) {
//切换到主线程
handler.post(new Runnable() {
@Override
public void run() {
okCallback.onFailure(e);
}
});
}
}
@Override
public void onResponse(Call call, Response response) throws IOException {
try {
if (response != null && response.isSuccessful()) {
final String json = response.body().string();
handler.post(new Runnable() {
@Override
public void run() {
if (okCallback != null) {
okCallback.onResponse(json);
}
}
});
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}依赖
implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.squareup.okhttp3:okhttp:3.12.0'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.github.bumptech.glide:glide:3.7.0'
LoggingInterceptor.java //拦截器
class LoggingInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
//拿到Request对象
Request request = chain.request();
long t1 = System.nanoTime();
System.out.println(" request = " + String.format("Sending request %s on %s%n%s",
request.url(), chain.connection(), request.headers()));
//拿到Response对象
Response response = chain.proceed(request);
long t2 = System.nanoTime();
//得出请求网络,到得到结果,中间消耗了多长时间
System.out.println("response " + String.format("Received response for %s in %.1fms%n%s",
response.request().url(), (t2 - t1) / 1e6d, response.headers()));
return response;
}
}看完上述内容，你们掌握怎么在Android中实现一个购物分类效果的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
新闻名称：怎么在Android中实现一个购物分类效果
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