侧滑删除及网络下载

网络下载

代码

public class Demo extends AppCompatActivity implements View.OnClickListener {

    long start = 0;
    long end = 1024*1024;
    long max;
    int time = 0;
    int sum = 0;

    SeekBar bar;
    Button jixu;
    Button parse;

    int temp;

    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case 100:
                    if(msg.obj != null){
                        if(time < 5){
                            new MyThread().start();
                            time++;
                        }else if(sum >= max){
                            handler.sendEmptyMessage(200);
                        }
                        Log.e("##########",msg.obj.toString());
                    }
                    break;
                    case 200:
                        Log.e("###########","下载完成");
                        break;
                case 300:
                    bar.setProgress(sum);
                    break;
            }
        }
    };

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

        initView();
        try {
            max = new MyTask().execute("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4").get();
            bar.setMax((int) max);
        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        new MyThread().start();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.start:
                if(temp >= 0) {
                    time = temp;
                    temp = -1;
                    new MyThread().start();
                }
                break;
            case R.id.parse:
                temp = time;
                time = 5;
                Message message = new Message();
                message.what = 100;
                handler.sendMessage(message);
                break;
                default:
                    break;
        }
    }

    class MyTask extends AsyncTask<String,String,Integer>{
        @Override
        protected Integer doInBackground(String... strings) {
            try {
                URL url = new URL(strings[0]);
                HttpURLConnection hu = (HttpURLConnection) url.openConnection();
                if(hu.getResponseCode() == 200){
                    int length = hu.getContentLength();
                    return length;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    }

    private void initView() {
        bar = findViewById(R.id.bar);
        jixu = findViewById(R.id.start);
        parse = findViewById(R.id.parse);
        jixu.setOnClickListener(this);
        parse.setOnClickListener(this);
    }

    private class MyThread extends Thread {
        @Override
        public void run() {
            try {
                URL url = new URL("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
                HttpURLConnection hu = (HttpURLConnection) url.openConnection();
                hu.setRequestMethod("GET");
                hu.setDoInput(true);
                hu.setDoOutput(true);
                String path = Environment.getExternalStorageDirectory().getPath();
                File ff = new File(path, "wang.mp4");
                RandomAccessFile file = new RandomAccessFile(ff, "rw");
                file.seek(start);
                hu.setRequestProperty("Range","bytes="+start+"-"+end);
                InputStream is = null;
                if(hu.getResponseCode() == 206){

                    int l = 0;
                    byte[] b = new byte[1024];
                    is = hu.getInputStream();
                    while ((l = is.read(b)) != -1){
                        file.write(b,0,l);
                        sum += l;

                        Message msg = new Message();
                        msg.what = 300;
                        handler.sendMessage(msg);
                    }

                    start = end+1;
                    end += 1024*1024;

                    Message message = new Message();
                    message.what = 100;
                    String ss = "正在下载"+start+"--"+end;
                    message.obj = ss;
                    handler.sendMessage(message);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

效果图
.

侧滑

适配器

public class MyAdapter1 extends RecyclerView.Adapter<MyAdapter1.RVHolder> {

    ArrayList<String> list= new ArrayList<>();
    public void refershData(ArrayList<String> mlist){
        list.addAll( mlist);
        notifyDataSetChanged();
    }
    @NonNull
    @Override
    public RVHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.name1,viewGroup,false);
        return new RVHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RVHolder rvHolder, final int i) {
        rvHolder.textView.setText(list.get(i));
        rvHolder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                isonclick.itemonclick(i);
            }
        });

    }

    public interface Isonclick{
        public void itemonclick(int id);
    }
    Isonclick isonclick;

    public void  Onclick(Isonclick isonclick) {
        this.isonclick = isonclick;
    }
    @Override
    public int getItemCount() {
        return list.size();
    }

    class RVHolder extends RecyclerView.ViewHolder{
        TextView textView;
        Button button;
        public RVHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.t1);
            button = itemView.findViewById(R.id.b2);
        }
    }
}

主类

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

    MyAdapter1 myAdapter1;

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

        init();
        initData();

    }

    private void init() {
        recyclerView = findViewById(R.id.myrecycler);
        final LinearLayoutManager manager = new LinearLayoutManager(this);
        manager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(manager);

        myAdapter1 = new MyAdapter1();
        recyclerView.setAdapter(myAdapter1);


        myAdapter1.Onclick(new MyAdapter1.Isonclick() {
            @Override
            public void itemonclick(int id) {
                myAdapter1.list.remove(id);
                myAdapter1.notifyDataSetChanged();
            }
        });

    }



    public void initData(){
       ArrayList<String> list= new ArrayList<>();
        for (int i=0;i<80;i++){
            list.add("第"+i+"个");
        }
        myAdapter1.refershData(list);
 
    }
}

侧滑布局

<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"
    tools:context=".MainActivity">

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

</LinearLayout>

效果图