Recyclerview and download files

@TOC

Common methods: setmoe (swipelayout. Show. Pullout) setmoe (swipelayout. Show. Layoun) open: openitem (subscript) close: closeitem (subscript) judge whether to open: isopen (subscript) get all open items: getopenitem() notes: 1. To write in the position of the layout, replace the linear or relative layout. 2. Swipelayout nested two sub layouts, The first one is displayed off the screen, and the second one is displayed. 3. Effect drawing of inheriting the class recyclerswapeadapter

//主布局
<?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:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context="com.bw.day17.Main17Activity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/mrecycleView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

//行布局
<?xml version="1.0" encoding="utf-8"?>
<com.daimajia.swipe.SwipeLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/swipe_layout">

    <LinearLayout
        android:background="#66ddff00"
        android:id="@+id/bottom_wrapper"
        android:layout_width="160dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button
            android:id="@+id/bottom"
            android:text="删除"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/bottom1"
            android:text="收藏"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:padding="10dp"
        android:background="#ffffff"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/surface"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

</com.daimajia.swipe.SwipeLayout>

package com.bw.day17;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

import day01.bw.com.myapplication.R;

public class Main17Activity extends AppCompatActivity {

    private RecyclerView mrecycleView;
    private List<String> list;
    private MyRecyclerViewAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main17);
        mrecycleView=findViewById(R.id.mrecycleView);
        list=new ArrayList<String>();
        for(int i=0;i<9;i++){
            list.add("条目"+i);
        }
        adapter=new MyRecyclerViewAdapter(this,list);
        mrecycleView.setLayoutManager(new linearlayoutmanager(this));
        mrecycleView.setAdapter(adapter);

    }
}

package com.bw.day17;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import com.daimajia.swipe.SwipeLayout;
import com.daimajia.swipe.adapters.RecyclerSwipeAdapter;

import java.util.List;

import day01.bw.com.myapplication.R;

public class MyRecyclerViewAdapter extends RecyclerSwipeAdapter<MyRecyclerViewAdapter.MyViewHolder> {

    private Context context;
    private List<String> list;
    public MyRecyclerViewAdapter(Context context,List<String> list){
        this.context=context;
        this.list=list;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.zuohua_item,parent,false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder viewHolder,final int position) {
        viewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);
        viewHolder.surface.setText(list.get(position));
        viewHolder.bottom.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                list.remove(position);
                notifyDataSetChanged();
            }
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    @Override
    public int getSwipeLayoutResourceId(int position) {
        return position;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {

        private SwipeLayout swipeLayout;
        private Button bottom;
        private TextView surface;

        public MyViewHolder(View itemView) {
            super(itemView);
            swipeLayout = itemView.findViewById(R.id.swipe_layout);
            bottom = itemView.findViewById(R.id.bottom);
            surface = itemView.findViewById(R.id.surface);
        }

    }
}

design sketch

package bw.com.breakpointresume;

import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.ExecutionException;

/**
 * 指定位置的下载
 *
 * 2.显示下载进度  总长度 当前进度
 *
 * 3.分批写入文件
 * */
public class MainActivity extends AppCompatActivity {
    long start = 0;
    long end  = 1024*1024;//要下载多少
    int max;//给总进度
    Button start_btn;
    Button pare_btn;
    Button button;
    ProgressBar progressBar;
    TextView textView;
    int time = 1;//第几次下载，一共下载5次
    boolean flag = false;
    int sum = 0;
    int num = 0;


    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 100 && msg.obj!= null){
                if (time < num){
                    new LoadFileThread().start();
                    progressBar.setProgress((int) end);
                    time++;
                }else {
                    //不下了发了一个空消息
                    handler.sendEmptyMessage(200);
                    progressBar.setProgress(max);
                }
                textView.setText(msg.obj.toString());
                Log.e("@@@",msg.obj.toString());
            }else if (msg.what == 200){
                textView.setText("下载完成");
            }else if (msg.what == 300){
                progressBar.setProgress(msg.arg1);
            }
        }
    };

    Handler handler2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        start_btn = findViewById(R.id.button_start);
        pare_btn = findViewById(R.id.button_parse);
        button = findViewById(R.id.start_btn);
        progressBar = findViewById(R.id.pb);
        try {
            max = new MyThread().execute("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4").get();
            num = (int) (max/end);
            progressBar.setMax(max);
        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        textView = findViewById(R.id.tv);





        start_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new LoadFileThread().start();
            }
        });
        //暂停
        pare_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flag = true;
                Message message = Message.obtain();
                message.obj = flag;
                handler2.sendMessage(message);
            }
        });

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flag = false;
                Message message = Message.obtain();
                message.obj = flag;
                handler2.sendMessage(message);
            }
        });



    }

    class MyThread extends AsyncTask<String,String, Integer> {

        @Override
        protected Integer doInBackground(String... strings) {
            try {
                URL url = new URL(strings[0]);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                if (httpURLConnection.getResponseCode() == 200){
                    return httpURLConnection.getContentLength();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    }



    class LoadFileThread extends Thread{
        @Override
        public void run() {
            super.run();

            Looper.prepare();//开启

            RandomAccessFile randomAccessFile = null;
            InputStream is = null;
            try {
                URL url = new URL("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setRequestMethod("GET");
                httpURLConnection.setDoInput(true);
                httpURLConnection.setDoOutput(true);


                //存文件的位置
                String path = "";
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                    path = Environment.getExternalStorageDirectory().getPath()+"/test.mp4";
                }
                randomAccessFile = new RandomAccessFile(path,"rw");
                randomAccessFile.seek(start);

                httpURLConnection.setRequestProperty("Range","bytes="+start+"-"+end);

                if (httpURLConnection.getResponseCode() == 206){
                    Log.e("###","来了老弟");
//                    max = httpURLConnection.getContentLength();//总长度   Range byte = 0-1024*1024
//                    Log.e("MAX",max+"");
//                    progressBar.setMax(max);
                    is = httpURLConnection.getInputStream();
                    byte[] bytes = new byte[1024];
                    int len = 0;
                    while ((len = is.read(bytes))!=-1){
                        randomAccessFile.write(bytes,0,len);
                    }
                    sum+=len;
                }


                //从上次结束的位置+1开始读
                start = end+1;
                end += 1024*1024;


                handler2 = new Handler(){
                    @Override
                    public void handleMessage(Message msg) {
                        super.handleMessage(msg);
                       boolean flag = Boolean.parseBoolean(msg.obj.toString());
                       if (flag){
                           Message message = Message.obtain();
                           message.what = 300;
                           message.arg1 = (int) end;
                           handler.sendMessage(message);
                       }else {
                           Log.e("start",start+"");
                           Log.e("end",end+"");
                           Message message = Message.obtain();
                           message.what = 100;//编号
                           message.obj = "文件第"+time+"次下载成功:"+start+"-"+end;
                           message.arg1 = (int) start;
                           handler.sendMessage(message);
                       }
                    }
                };


                    Log.e("start",start+"");
                    Log.e("end",end+"");
                    Message message = Message.obtain();
                    message.what = 100;//编号
                    message.obj = "文件第"+time+"次下载成功:"+start+"-"+end;
                    message.arg1 = (int) start;
                    handler.sendMessage(message);


            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                if (randomAccessFile != null){
                    try {
                        randomAccessFile.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (is != null){
                    try {
                        is.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            Looper.loop();
        }
    }
}

<?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:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/pb"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        style="@android:style/Widget.ProgressBar.Horizontal"
        />

    <Button
    android:id="@+id/button_start"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="开始下载"
    />

    <Button
        android:id="@+id/button_parse"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="暂停下载"
        />

    <Button
        android:id="@+id/start_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="继续下载"
        />

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        />
</LinearLayout>