<?xml version='1.0' encoding='utf-8'?><FrameLayout xmlns:android='http://schemas.android.com/apk/res/android' xmlns:tools='http://schemas.android.com/tools' android:layout_width='match_parent' android:layout_height='match_parent' android:background='#f0f3f5' tools:context='.MainActivity'> <LinearLayoutandroid:layout_width='match_parent'android:layout_height='match_parent'android:orientation='vertical'tools:context='.MainActivity'><ImageView android:layout_width='match_parent' android:layout_height='wrap_content' android:src='http://www.cgvv.com.cn/bcjs/@mipmap/logo'/><LinearLayout android:layout_width='match_parent' android:layout_height='wrap_content' android:layout_marginTop='10dp' android:orientation='vertical'> <LinearLayoutandroid:layout_width='match_parent'android:layout_height='wrap_content'android:orientation='horizontal'android:gravity='center'><TextView android:layout_width='0dp' android:layout_weight='1' android:layout_height='wrap_content' android:gravity='center' android:text='電影名'/><LinearLayout android:layout_width='0dp' android:layout_weight='1' android:gravity='center' android:layout_height='wrap_content' android:orientation='horizontal'> <TextViewandroid:layout_width='wrap_content'android:layout_height='match_parent'android:text='電影評分' /></LinearLayout><TextView android:layout_width='0dp' android:layout_weight='1' android:gravity='center' android:layout_height='wrap_content' android:text='電影圖片'/> </LinearLayout></LinearLayout><androidx.swiperefreshlayout.widget.SwipeRefreshLayout android:layout_height='wrap_content' android:layout_width='wrap_content' android:id='@+id/s1'> <androidx.recyclerview.widget.RecyclerViewandroid: android:layout_width='match_parent'android:layout_height='wrap_content' /></androidx.swiperefreshlayout.widget.SwipeRefreshLayout> </LinearLayout></FrameLayout>

列表布局list.xml

<?xml version='1.0' encoding='utf-8'?><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android:orientation='horizontal' android:layout_width='match_parent' android:layout_height='160dp'> <TextViewandroid: android:layout_width='0dp'android:layout_weight='1.5'android:gravity='center'android:layout_height='wrap_content'android:layout_gravity='center'android:text='我不是藥神'/> <TextViewandroid: android:layout_width='0dp'android:layout_weight='1'android:layout_height='wrap_content'android:layout_gravity='center'android:gravity='center'android:text='9.0'/> <ImageViewandroid: android:layout_width='0dp'android:layout_weight='1.5'android:layout_height='150dp'android:padding='20dp'android:src='http://www.cgvv.com.cn/bcjs/@mipmap/ic_launcher'/></LinearLayout>

加載更多布局foot_view.xml

<?xml version='1.0' encoding='utf-8'?><TextView xmlns:android='http://schemas.android.com/apk/res/android' xmlns:tools='http://schemas.android.com/tools' android: android:layout_width='match_parent' android:layout_height='wrap_content' android:padding='10dp' android:gravity='center' tools:text='下拉刷新' android:orientation='vertical'/>

(1)添加網絡權限

<uses-permission android:name='android.permission.INTERNET'/>

(2)添加使用到的第三方庫

implementation ’com.android.support:design:28.0.0’ implementation ’com.android.support:support-v4:28.0.0’ implementation ’com.android.support:appcompat-v7:28.0.0’ implementation ’com.squareup.okhttp3:okhttp:3.12.1’ debugImplementation ’com.squareup.okhttp3:logging-interceptor:3.12.1’ implementation ’com.google.code.gson:gson:2.8.5’ implementation ’com.github.bumptech.glide:glide:4.9.0’ annotationProcessor ’com.github.bumptech.glide:compiler:4.9.0’

(3)數據解析使用GsonFormat插件，快速將json字符串轉換成一個Java Bean，免去我們根據json字符串手寫對應Java Bean的過程。定義一個類OneModel.class

public class OneModel implements Serializable {}

使用快捷鍵（Alt+s）粘貼全部過去數據，之后一直點擊OK

(4)綁定控件ID

private RecyclerView r1;private SwipeRefreshLayout s1;private LinearLayoutManager linearLayoutManager;private Adapter adapter;

(5)定義一個Adapter類

package com.example.note4;import android.content.Context;import android.graphics.Color;import android.os.Handler;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import androidx.recyclerview.widget.RecyclerView;import com.bumptech.glide.Glide;import java.util.List;public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> { private Context mContext; private List<DateModel.SubjectsBean> mData;//數據 private int max_count = 6;//最大顯示數 private Boolean isFootView = false;//是否添加了FootView private String footViewText = '';//FootView的內容 //兩個final int類型表示ViewType的兩種類型 private final int NORMAL_TYPE = 0; private final int FOOT_TYPE = 1111; public Adapter(Context context, List<DateModel.SubjectsBean> data) {this.mContext = context;this.mData = data; } public class ViewHolder extends RecyclerView.ViewHolder {public TextView t3,t2;public ImageView i1;private TextView tvFootView;//初始化viewHolder，此處綁定后在onBindViewHolder中可以直接使用public ViewHolder(View itemView, int viewType) { super(itemView); if (viewType == NORMAL_TYPE) {t3 = (TextView) itemView.findViewById(R.id.t3);t2 = (TextView) itemView.findViewById(R.id.t2);i1=(ImageView)itemView.findViewById(R.id.i1); } else if (viewType == FOOT_TYPE) {tvFootView = (TextView) itemView.findViewById(R.id.tv_foot); }} } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View normal_views = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);View foot_view = LayoutInflater.from(parent.getContext()).inflate(R.layout.foot_view, parent, false);if (viewType == FOOT_TYPE) return new ViewHolder(foot_view, FOOT_TYPE);return new ViewHolder(normal_views, NORMAL_TYPE); } @Override public int getItemViewType(int position) {if (position == max_count - 1) { return FOOT_TYPE;}return NORMAL_TYPE; } @Override public void onBindViewHolder(ViewHolder holder, int position) {DateModel.SubjectsBean subjectsBean=mData.get(position);//如果footview存在，并且當前位置ViewType是FOOT_TYPEif (isFootView && (getItemViewType(position) == FOOT_TYPE)) { holder.tvFootView.setText(footViewText); // 刷新太快 所以使用Hanlder延遲兩秒 Handler handler = new Handler(); handler.postDelayed(new Runnable() {@Overridepublic void run() { max_count += 5; notifyDataSetChanged();} }, 1000);} else { holder.t2.setText(subjectsBean.getTitle()); holder.t3.setText(subjectsBean.getRate()); Glide.with(mContext).load(subjectsBean.getCover()).into(holder.i1);} } @Override public int getItemCount() {if (mData.size() <= max_count) { return mData.size();}return max_count; } //創建一個方法來設置footView中的文字 public void setFootViewText(String footViewText) {isFootView = true;this.footViewText = footViewText; }}

(6)網絡請求

public void getDate(DateModel dateModel) {if(dateModel==null||dateModel.getSubjects()==null){ Toast.makeText(MainActivity.this,'失敗',Toast.LENGTH_SHORT).show(); return;}Toast.makeText(MainActivity.this,'成功',Toast.LENGTH_SHORT).show();adapter=new Adapter(MainActivity.this,dateModel.getSubjects());adapter.setFootViewText('加載中...');r1.setAdapter(adapter);s1.setRefreshing(false); } public void requestDate() {String url = 'https://movie.douban.com/j/search_subjects?type=movie&tag=%E8%B1%86%E7%93%A3%E9%AB%98%E5%88%86&sort=recommend&page_limit=200&page_start=0';OkHttpClient okHttpClient = new OkHttpClient();final Request request = new Request.Builder().url(url).get().build();Call call = okHttpClient.newCall(request);call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) {runOnUiThread(new Runnable() { @Override public void run() {Toast.makeText(MainActivity.this, '網絡連接失敗', Toast.LENGTH_SHORT).show(); }}); } @Override public void onResponse(Call call, Response response) throws IOException {String result = response.body().string();Gson gson = new Gson();final DateModel dateModel = gson.fromJson(result, DateModel.class);runOnUiThread(new Runnable() { @Override public void run() {Toast.makeText(MainActivity.this, '網絡連接成功', Toast.LENGTH_SHORT).show();getDate(dateModel); }}); }}); }

(7)功能實現

linearLayoutManager=new LinearLayoutManager(MainActivity.this);linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);r1.setLayoutManager(linearLayoutManager);requestDate();s1.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() {new Handler().postDelayed(new Runnable() { @Override public void run() {requestDate(); }},1000); }});

(8)源代碼點擊下載

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