簡單實現斷點續傳+MVP+Retrofit+RxJava
阿新 • • 發佈：2019-01-05
依賴：
compile 'com.squareup.retrofit2:retrofit:2.0.1'
compile 'com.squareup.retrofit2:converter-gson:2.0.1'
compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'
compile 'io.reactivex:rxandroid:1.1.0'
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1' Api類
public class Api {
public static final String Urljson1 = "https://api.tianapi.com/wxnew/";
}
ApiService類
public interface ApiService {
@POST
Observable<Users> getUser(@Url String url);
}
IModel類
public interface IModel {
void UserModel類
import android.util.Log;
import com.six.zhouerlianxi.Apiservers.ApiService;
import com.six.zhouerlianxi.bean.Users;
import java.util.ArrayList;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Observable;
import rx.Observer;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
/**
* Created by wangjiao on 2017/11/11.
*/
public class UserModel implements IModel{
ArrayList<Users.NewslistBean> list;
//重新整理載入
String path;
public UserModel(String path) {
this.path = path;
}
private OnFinish onFinish;
public interface OnFinish{
void OnFinishListener(ArrayList<Users.NewslistBean> list);
}
public void setOnFinish(OnFinish finish){
this.onFinish=finish;
}
@Override
public void getJson(String url) {
list = new ArrayList<>();
Retrofit retrofit = new Retrofit.Builder().baseUrl(url).addConverterFactory(GsonConverterFactory.create()).addCallAdapterFactory(RxJavaCallAdapterFactory.create()).build();
ApiService apiService = retrofit.create(ApiService.class);
//載入
final Observable<Users> home = apiService.getUser(path);
home.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Users>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Users homeBean) {
list = (ArrayList<Users.NewslistBean>) homeBean.getNewslist();
Log.d("1111111111",list.get(0).getTitle());
onFinish.OnFinishListener(list);
}
});
}
}
IView類
public interface IView {
void getUser(ArrayList<Users.NewslistBean> list);
}
UserPresenter類
import com.six.zhouerlianxi.bean.Users;
import com.six.zhouerlianxi.model.UserModel;
import com.six.zhouerlianxi.view.IView;
import java.util.ArrayList;
/**
* Created by wangjiao on 2017/11/11.
*/
public class UserPresenter implements UserModel.OnFinish{
private final IView userView;
private final UserModel userModel;
//載入string url
public UserPresenter(IView userView,String url) {
this.userView = userView;
this.userModel = new UserModel(url);
userModel.setOnFinish(this);
}
public void setNews(String url){
userModel.getJson(url);
}
@Override
public void OnFinishListener(ArrayList<Users.NewslistBean> list) {
userView.getUser(list);
}
}
MainActivity類
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.jcodecraeer.xrecyclerview.XRecyclerView;
import com.loopj.android.http.HttpGet;
import com.six.zhouerlianxi.API.Api;
import com.six.zhouerlianxi.adapter.HomeAdapter;
import com.six.zhouerlianxi.adapter.OnItemClickLitener;
import com.six.zhouerlianxi.bean.Users;
import com.six.zhouerlianxi.presenters.UserPresenter;
import com.six.zhouerlianxi.view.IView;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import cz.msebera.android.httpclient.Header;
import cz.msebera.android.httpclient.HttpResponse;
import cz.msebera.android.httpclient.client.HttpClient;
import cz.msebera.android.httpclient.client.methods.HttpHead;
import cz.msebera.android.httpclient.impl.client.DefaultHttpClient;
public class MainActivity extends AppCompatActivity implements IView {
UserPresenter userPresenter;
private HomeAdapter adapter;
private XRecyclerView xr;
LinearLayout line1;
protected static final String TAG = "OtherActivity";
//下載執行緒的數量
private final static int threadsize = 3;
protected static final int SET_MAX = 0;
public static final int UPDATE_VIEW = 1;
private boolean flag = false;//是否在下載
private ProgressBar pb;
private TextView tv_info;
//載入
String url;
int a=1;
private ArrayList<Users.NewslistBean> newslistBeen;
String uri = "https://zxpic.gtimg.com/infonew/0/wechat_pics_-58717788.jpg/640";
//顯示進度和更新進度
private Handler mHandler = new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case SET_MAX://設定進度條的最大值
int filelength = msg.arg1;
pb.setMax(filelength);
break;
case UPDATE_VIEW://更新進度條 和 下載的比率
int len = msg.arg1;//新下載的長度
pb.setProgress(pb.getProgress()+len);//設定進度條的刻度
int max = pb.getMax();//獲取進度的最大值
int progress = pb.getProgress();//獲取已經下載的資料量
// 下載：30 總：100
int result = (progress*100)/max;
tv_info.setText("下載:"+result+"%");
if (result==100){
line1.setVisibility(View.GONE);
}
break;
default:
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//載入
newslistBeen = new ArrayList<Users.NewslistBean>();
url= "?key=8d6e3228d25298f13af4fc40ce6c9679&num=20&page="+a;
xr = (XRecyclerView) findViewById(R.id.xre_xrv);
pb = (ProgressBar) findViewById(R.id.progressBar);
line1 = (LinearLayout) findViewById(R.id.line1);
tv_info = (TextView) findViewById(R.id.text3);
userPresenter = new UserPresenter(this,url);
userPresenter.setNews(Api.Urljson1);
String name = getFileName(uri);
File file = new File(Environment.getExternalStorageDirectory(), name);
if (file.exists()){//檔案存在回顯
//獲取檔案的大小
int filelength = (int) file.length();
pb.setMax(filelength);
try {
//統計原來所有的下載量
int count = 0;
//讀取下載記錄檔案
for (int threadid = 0; threadid < threadsize; threadid++) {
//獲取原來指定執行緒的下載記錄
int existDownloadLength = readDownloadInfo(threadid);
count = count + existDownloadLength;
}
//設定進度條的刻度
pb.setProgress(count);
//計算比率
int result = (count * 100) / filelength;
tv_info.setText("下載:" + result + "%");
} catch (Exception e) {
e.printStackTrace();
}
}
//暫停
pb.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
flag = false;
pb.setEnabled(true);
pb.setEnabled(false);
Toast.makeText(MainActivity.this,"暫停",Toast.LENGTH_SHORT).show();
return false;
}
});
}
//下載
public void download(View v){
line1.setVisibility(View.VISIBLE);
flag = true; //是在下載
pb.setEnabled(false);//一點選變成不可點選
pb.setEnabled(true);//一點選變成可點選
new Thread(){//子執行緒
public void run() {
try {
//獲取伺服器上檔案的大小
HttpClient client = new DefaultHttpClient();
HttpHead request = new HttpHead(uri);
HttpResponse response = client.execute(request);
//response 只有響應頭 沒有響應體
if(response.getStatusLine().getStatusCode() == 200){
Header[] headers = response.getHeaders("Content-Length");
String value = headers[0].getValue();
//檔案大小
int filelength = Integer.parseInt(value);
Log.i(TAG, "filelength:"+filelength);
//設定進度條的最大值
Message msg_setmax = Message.obtain(mHandler, SET_MAX, filelength, 0);
msg_setmax.sendToTarget();
//處理下載記錄檔案
for(int threadid=0;threadid<threadsize;threadid++){
//對應的下載記錄檔案
File file = new File(Environment.getExternalStorageDirectory(),threadid+".txt");
//判斷檔案是否存在
if(!file.exists()){
//建立檔案
file.createNewFile();
}
}
//在sdcard建立和伺服器大小一樣的檔案
String name = getFileName(uri);
File file = new File(Environment.getExternalStorageDirectory(),name);
//隨機訪問檔案
RandomAccessFile raf = new RandomAccessFile(file, "rwd");
//設定檔案的大小
raf.setLength(filelength);
//關閉
raf.close();
//計算每條執行緒的下載量
int block = (filelength%threadsize == 0)?(filelength/threadsize):(filelength/threadsize+1);
//開啟三條執行緒執行下載
for(int threadid=0;threadid<threadsize;threadid++){
new DownloadThread(threadid, uri, file, block).start();
}
}
} catch (Exception e) {
e.printStackTrace();
}
};
}.start();
}
@Override
public void getUser(ArrayList<Users.NewslistBean> list) {
//載入
if (a==1){
newslistBeen.clear();
}
newslistBeen.addAll(list);
xr.setLayoutManager(new LinearLayoutManager(this));
adapter = new HomeAdapter(list,this);
adapter.setOnItemClickLitener(new OnItemClickLitener() {
@Override
public void onItemClick(View view, int position) {
uri=newslistBeen.get(position).getPicUrl();
Toast.makeText(MainActivity.this,uri,Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position) {
Toast.makeText(MainActivity.this,"長按",Toast.LENGTH_SHORT).show();
}
});
xr.setAdapter(adapter);
//載入
xr.setLoadingListener(new XRecyclerView.LoadingListener() {
@Override
public void onRefresh() {
a=1;
userPresenter = new UserPresenter(MainActivity.this, url);
userPresenter.setNews(Api.Urljson1);
adapter.notifyDataSetChanged();;
xr.refreshComplete();
}
@Override
public void onLoadMore() {
a++;
url="?key=8d6e3228d25298f13af4fc40ce6c9679&num=20&page="+a;
userPresenter = new UserPresenter(MainActivity.this, url);
userPresenter.setNews(Api.Urljson1);
adapter.notifyDataSetChanged();;
xr.loadMoreComplete();
}
});
}
//執行緒下載類
private class DownloadThread extends Thread{
private int threadid;//執行緒的id
private String uri;//下載的地址
private File file;//下載檔案
private int block;//下載的塊
private int start;
private int end;
public DownloadThread(int threadid, String uri, File file, int block) {
super();
this.threadid = threadid;
this.uri = uri;
this.file = file;
this.block = block;
//計算下載的開始位置和結束位置
start = threadid * block;
end = (threadid + 1)*block -1;
try {
//讀取該條執行緒原來的下載記錄
int existDownloadLength = readDownloadInfo(threadid);
//修改下載的開始位置 從新下載
start = start + existDownloadLength;
} catch (Exception e) {
e.printStackTrace();
}
}
//下載 狀態碼：200是普通的下載 206是分段下載 Range:範圍
@Override
public void run() {
super.run();
try {
RandomAccessFile raf = new RandomAccessFile(file, "rwd");
//跳轉到起始位置
raf.seek(start);
//分段下載
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(uri);
request.addHeader("Range", "bytes:"+start+"-"+end);//新增請求頭
HttpResponse response = client.execute(request);
if(response.getStatusLine().getStatusCode() == 200){
InputStream inputStream = response.getEntity().getContent();
//把流寫入到檔案
byte[] buffer = new byte[1024];
int len = 0;
while((len = inputStream.read(buffer)) != -1){
//如果暫停下載 點選暫停 false 就直接return 點選下載true接著下載
if(!flag){
return;//標準執行緒結束
}
//寫資料
raf.write(buffer, 0, len);
//讀取原來下載的資料量 這裡讀取是為了更新下載記錄
int existDownloadLength = readDownloadInfo(threadid);//原來下載的資料量
//計算最新的下載
int newDownloadLength = existDownloadLength + len;
//更新下載記錄 從新記錄最新下載位置
updateDownloadInfo(threadid, newDownloadLength);
//更新進度條的顯示 下載的百分比
Message update_msg = Message.obtain(mHandler, UPDATE_VIEW, len, 0);
update_msg.sendToTarget();
//模擬 看到進度條動的效果
SystemClock.sleep(50);
}
inputStream.close();
raf.close();
Log.i(TAG, "第"+threadid+"條執行緒下載完成");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 讀取指定執行緒的下載資料量
* @param threadid 執行緒的id
* @return
* @throws Exception
*/
public int readDownloadInfo(int threadid) throws Exception{
//下載記錄檔案
File file = new File(Environment.getExternalStorageDirectory(),threadid+".txt");
BufferedReader br = new BufferedReader(new FileReader(file));
//讀取一行資料
String content = br.readLine();
int downlength = 0;
//如果該檔案第一次建立去執行讀取操作 檔案裡面的內容是 null
if(!TextUtils.isEmpty(content)){
downlength = Integer.parseInt(content);
}
//關閉流
br.close();
return downlength;
}
/**
* 更新下載記錄
* @param threadid
* @param newDownloadLength
*/
public void updateDownloadInfo(int threadid,int newDownloadLength) throws Exception{
//下載記錄檔案
File file = new File(Environment.getExternalStorageDirectory(),threadid+".txt");
FileWriter fw = new FileWriter(file);
fw.write(newDownloadLength+"");
fw.close();
}
/**
* 獲取檔案的名稱
* @param uri
* @return
*/
private String getFileName(String uri){
return uri.substring(uri.lastIndexOf("/")+1);
}
}
HomeAdapter類
import android.content.Context;
import android.net.Uri;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.facebook.drawee.backends.pipeline.Fresco;
import com.facebook.drawee.interfaces.DraweeController;
import com.facebook.drawee.view.SimpleDraweeView;
import com.six.zhouerlianxi.R;
import com.six.zhouerlianxi.bean.Users;
import java.util.List;
/**
* Created by wangjiao on 2017/11/11.
*/
public class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder>
{
protected static final String TAG = "OtherActivity";
//下載執行緒的數量
private final static int threadsize = 3;
protected static final int SET_MAX = 0;
public static final int UPDATE_VIEW = 1;
List<Users.NewslistBean> userses;
Context context;
private OnItemClickLitener mOnItemClickLitener;
public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
{
this.mOnItemClickLitener = mOnItemClickLitener;
}
public HomeAdapter(List<Users.NewslistBean> userses, Context context) {
this.userses = userses;
this.context = context;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
MyViewHolder holder = new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_home, parent, false));
return holder;
}
@Override
public void onBindViewHolder(final MyViewHolder holder, int position)
{
holder.tv.setText(userses.get(position).getTitle());
Uri uri = Uri.parse(userses.get(position).getPicUrl());
DraweeController controller = Fresco.newDraweeControllerBuilder()
.setUri(uri)
.setAutoPlayAnimations(true)
.build();
holder.image.setController(controller);
// 如果設定了回撥，則設定點選事件
if (mOnItemClickLitener != null)
{
holder.itemView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
int pos = holder.getLayoutPosition();
mOnItemClickLitener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener()
{
@Override
public boolean onLongClick(View v)
{
int pos = holder.getLayoutPosition();
mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
@Override
public int getItemCount()
{
return userses.size();
}
class MyViewHolder extends RecyclerView.ViewHolder
{
TextView tv;
SimpleDraweeView image;
public MyViewHolder(View view)
{
super(view);
tv = view.findViewById(R.id.text);
image = (SimpleDraweeView) view.findViewById(R.id.image);
}
}
}進度條