使用Retrofit搭建一个listview分页加载

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Retrofit

Retrofit github地址
日常使用的app都会有app浏览界面到底部自动加载数据，这就是分页加载，数据量太庞大容易造成布局卡顿，及内存使用变小，所以一般界面展示都是采取分页加载
直接上代码
package com.qw.dp.qwapplication.activity;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.CountDownTimer;import android.support.v4.content.ContextCompat;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.bumptech.glide.Glide;import com.bumptech.glide.load.engine.DiskCacheStrategy;import com.qw.dp.qwapplication.R;import com.qw.dp.qwapplication.app.MovieService;import com.qw.dp.qwapplication.bean.Movie;import com.qw.dp.qwapplication.utils.ToastUtils;import java.util.List;import cn.pedant.SweetAlert.SweetAlertDialog;import retrofit2.Call;import retrofit2.Callback;import retrofit2.Response;import retrofit2.Retrofit;import retrofit2.converter.gson.GsonConverterFactory;/** * 类名称： * 类功能： * 类作者：Qw * 类日期：2017/1/5 **/public class RetrofitActivity extends Activity {    private ListView listView;    private boolean isBottom;    private List<Movie.SubjectsBean> subjectsBeen;    private MyAdapter adapter;    private Context mContext;    private SweetAlertDialog pDialog;    private int i;    //上次滑动的底部也是下一页的开始    private int START = 0;    private int allSize = 250;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_retrofit);        mContext = this;        getMovie(0, 10);        initView();        initEvent();    }    private void initView() {        listView = (ListView) findViewById(R.id.listView);    }    private void getMovie(int start, int end) {        String baseUrl = "https://api.douban.com/v2/movie/";        Retrofit retrofit = new Retrofit.Builder()                .baseUrl(baseUrl)                .addConverterFactory(GsonConverterFactory.create())                .build();        MovieService movieService = retrofit.create(MovieService.class);        Call<Movie> call = movieService.getTopMovie(start, end);        call.enqueue(new Callback<Movie>() {            @Override            public void onResponse(Call<Movie> call, Response<Movie> response) {                subjectsBeen = response.body().getSubjects();                if (null == adapter) {                    adapter = new MyAdapter(RetrofitActivity.this, subjectsBeen);                    listView.setAdapter(adapter);                    adapter.notifyDataSetChanged();                } else {                    int count = adapter.getCount();                    if (count + 10 <= subjectsBeen.size()) {                        for (int i = count + 1; i < count + 10; i++) {                            Movie.SubjectsBean bean = new Movie.SubjectsBean();                            bean.setOriginal_title(subjectsBeen.get(i).getOriginal_title());                            bean.setImages(subjectsBeen.get(i).getImages());                            adapter.addItem(bean);                        }                        adapter.notifyDataSetChanged();                        listView.setSelection(START);                        pDialog.dismiss();                    } else {                        for (int i = count + 1; i <= subjectsBeen.size(); i++) {                            Movie.SubjectsBean bean = new Movie.SubjectsBean();                            bean.setOriginal_title(subjectsBeen.get(i).getOriginal_title());                            bean.setImages(subjectsBeen.get(i).getImages());                            adapter.addItem(bean);                        }                        adapter.notifyDataSetChanged();                        listView.setSelection(START);                        pDialog.dismiss();                    }                }                Log.v("数据", subjectsBeen.size() + "");            }            @Override            public void onFailure(Call<Movie> call, Throwable t) {                ToastUtils.showShortToast("数据加载异常");                adapter.notifyDataSetChanged();                pDialog.dismiss();            }        });    }    private void initEvent() {        listView.setOnScrollListener(new AbsListView.OnScrollListener() {            @Override            public void onScrollStateChanged(AbsListView view, int scrollState) {                // 静态属性                // SCROLL_STATE_IDLE = 0; // 空闲状态                // SCROLL_STATE_TOUCH_SCROLL = 1; // 滚动状态,并且手指在屏幕上                // SCROLL_STATE_FLING = 2;    //    滚动状态,手指已经离开了屏幕                if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {                    if (isBottom) {                        pDialog = new SweetAlertDialog(mContext, SweetAlertDialog.PROGRESS_TYPE)                                .setTitleText("Loading");                        pDialog.show();                        pDialog.setCancelable(false);                        new CountDownTimer(800 * 800, 800) {                            public void onTick(long millisUntilFinished) {                                // you can change the progress bar color by ProgressHelper every 800 millis                                i++;                                switch (i) {                                    case 0:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.blue_btn_bg_color));                                        break;                                    case 1:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.material_deep_teal_50));                                        break;                                    case 2:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.success_stroke_color));                                        break;                                    case 3:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.material_deep_teal_20));                                        break;                                    case 4:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.material_blue_grey_80));                                        break;                                    case 5:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.warning_stroke_color));                                        break;                                    case 6:                                        if (pDialog.isShowing())                                            pDialog.getProgressHelper().setBarColor(ContextCompat.getColor(mContext, R.color.success_stroke_color));                                        break;                                }                            }                            public void onFinish() {                                i = -1;                                pDialog.setTitleText("Success!")                                        .setConfirmText("OK")                                        .changeAlertType(SweetAlertDialog.SUCCESS_TYPE);                            }                        }.start();                        //加载数据的方法代码.......                        getMovie(subjectsBeen.size(), subjectsBeen.size() + 10);                    }                }            }            @Override            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {                // 说明:                // fistVisibleItem:表示划出屏幕的ListView子项个数                // visibleItemCount:表示屏幕中正在显示的ListView子项个数                // totalItemCount:表示ListView子项的总数                // 前两个相加==最后一个说明ListView滑到底部                isBottom = firstVisibleItem + visibleItemCount == totalItemCount;                if (isBottom){                    START = totalItemCount + 1;                }                //子项等于最大数据总量                if (allSize == totalItemCount){                    ToastUtils.showShortToast("数据已经全部加载完毕");                }            }        });    }    public class MyAdapter extends BaseAdapter {        List<Movie.SubjectsBean> list;        Context context;        public MyAdapter(Context context, List<Movie.SubjectsBean> list) {            this.context = context;            this.list = list;        }        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int position) {            return position;        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(final int position, View convertView, ViewGroup parent) {            ViewHolder viewHolder;            if (convertView == null) {                convertView = LayoutInflater.from(context).inflate(R.layout.homefragment_gridview_item, null);                viewHolder = new ViewHolder();                viewHolder.iv_item = (ImageView) convertView.findViewById(R.id.iv_item);                viewHolder.tv_item = (TextView) convertView.findViewById(R.id.tv_item);                convertView.setTag(viewHolder);            } else {                viewHolder = (ViewHolder) convertView.getTag();            }            Glide.with(context)                    .load(list.get(position).getImages().getSmall())                    .diskCacheStrategy(DiskCacheStrategy.SOURCE)                    .into(viewHolder.iv_item);            viewHolder.tv_item.setText(list.get(position).getOriginal_title());            return convertView;        }        public class ViewHolder {            ImageView iv_item;            TextView tv_item;        }        public void addItem(Movie.SubjectsBean item) {            list.add(item);        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if (null != subjectsBeen){            subjectsBeen.clear();        }        if (null != pDialog){            pDialog.dismiss();        }    }}
这里写图片描述
搞定，以上是demo的效果。
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