compile ‘com.nononsenseapps:filepicker:2.5.2‘

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/tvMsg"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:focusable="false"        android:focusableInTouchMode="false"        android:text="TextView"        android:textColor="#AAA" />    <EditText        android:id="@+id/txtIP"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@+id/tvMsg"        android:layout_centerVertical="true"        android:contentDescription="目标IP地址"        android:ems="10"        android:text="192.168.1.100" />    <EditText        android:id="@+id/txtPort"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/txtIP"        android:layout_below="@+id/txtIP"        android:ems="10"        android:text="9999" />    <EditText        android:id="@+id/et"        android:layout_width="match_parent"        android:layout_height="180dp"        android:layout_alignLeft="@+id/txtIP"        android:layout_below="@+id/txtPort"        android:clickable="false"        android:editable="false"        android:ems="10"        android:focusable="false"        android:focusableInTouchMode="false"        android:gravity="center_vertical|left|top"        android:inputType="textMultiLine"        android:longClickable="false"        android:scrollbarAlwaysDrawVerticalTrack="true"        android:scrollbarStyle="insideInset"        android:scrollbars="vertical"        android:textSize="15dp" >        <requestFocus />    </EditText>    <Button        android:id="@+id/btnSend"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/txtPort"        android:layout_below="@+id/et"        android:text="选择文件并发送" /></RelativeLayout>

public class MainActivity extends AppCompatActivity {    private static final int FILE_CODE = 0;    private TextView tvMsg;    private EditText txtIP, txtPort, txtEt;    private Button btnSend;    private Handler handler;    private SocketManager socketManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tvMsg = (TextView)findViewById(R.id.tvMsg);        txtIP = (EditText)findViewById(R.id.txtIP);        txtPort = (EditText)findViewById(R.id.txtPort);        txtEt = (EditText)findViewById(R.id.et);        btnSend = (Button)findViewById(R.id.btnSend);        btnSend.setOnClickListener(new View.OnClickListener(){            @Override            public void onClick(View v) {                Intent i = new Intent(MainActivity.this, FilePickerActivity.class);                i.putExtra(FilePickerActivity.EXTRA_ALLOW_MULTIPLE, true);                i.putExtra(FilePickerActivity.EXTRA_ALLOW_CREATE_DIR, false);                i.putExtra(FilePickerActivity.EXTRA_MODE, FilePickerActivity.MODE_FILE);                i.putExtra(FilePickerActivity.EXTRA_START_PATH, Environment.getExternalStorageDirectory().getPath());                startActivityForResult(i, FILE_CODE);            }        });        handler = new Handler(){            @Override            public void handleMessage(Message msg) {                switch(msg.what){                    case 0:                        SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");                        txtEt.append("\n[" + format.format(new Date()) + "]" + msg.obj.toString());                        break;                    case 1:                        tvMsg.setText("本机IP：" + GetIpAddress() + " 监听端口:" + msg.obj.toString());                        break;                    case 2:                        Toast.makeText(getApplicationContext(), msg.obj.toString(), Toast.LENGTH_SHORT).show();                        break;                }            }        };        socketManager = new SocketManager(handler);    }    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == FILE_CODE && resultCode == Activity.RESULT_OK) {            final String ipAddress = txtIP.getText().toString();            final int port = Integer.parseInt(txtPort.getText().toString());            if (data.getBooleanExtra(FilePickerActivity.EXTRA_ALLOW_MULTIPLE, true)) {                // For JellyBean and above                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {                    ClipData clip = data.getClipData();                    final ArrayList<String> fileNames = new ArrayList<>();                    final ArrayList<String> paths = new ArrayList<>();                    if (clip != null) {                        for (int i = 0; i < clip.getItemCount(); i++) {                            Uri uri = clip.getItemAt(i).getUri();                            paths.add(uri.getPath());                            fileNames.add(uri.getLastPathSegment());                        }                        Message.obtain(handler, 0, "正在发送至" + ipAddress + ":" +  port).sendToTarget();                        Thread sendThread = new Thread(new Runnable(){                            @Override                            public void run() {                                socketManager.SendFile(fileNames, paths, ipAddress, port);                            }                        });                        sendThread.start();                    }                } else {                    final ArrayList<String> paths = data.getStringArrayListExtra                            (FilePickerActivity.EXTRA_PATHS);                    final ArrayList<String> fileNames = new ArrayList<>();                    if (paths != null) {                        for (String path: paths) {                            Uri uri = Uri.parse(path);                            paths.add(uri.getPath());                            fileNames.add(uri.getLastPathSegment());                            socketManager.SendFile(fileNames, paths, ipAddress, port);                        }                        Message.obtain(handler, 0, "正在发送至" + ipAddress + ":" +  port).sendToTarget();                        Thread sendThread = new Thread(new Runnable(){                            @Override                            public void run() {                                socketManager.SendFile(fileNames, paths, ipAddress, port);                            }                        });                        sendThread.start();                    }                }            }        }    }    @Override    protected void onDestroy() {        super.onDestroy();        System.exit(0);    }    public String GetIpAddress() {
        WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);        WifiInfo wifiInfo = wifiManager.getConnectionInfo();        int i = wifiInfo.getIpAddress();        return (i & 0xFF) + "." +                ((i >> 8 ) & 0xFF) + "." +                ((i >> 16 ) & 0xFF)+ "." +                ((i >> 24 ) & 0xFF );    }}

public class SocketManager {    private ServerSocket server;    private Handler handler = null;    public SocketManager(Handler handler){        this.handler = handler;        int port = 9999;        while(port > 9000){            try {                server = new ServerSocket(port);                break;            } catch (Exception e) {                port--;            }        }        SendMessage(1, port);        Thread receiveFileThread = new Thread(new Runnable(){            @Override            public void run() {                while(true){                    ReceiveFile();                }            }        });        receiveFileThread.start();    }    void SendMessage(int what, Object obj){        if (handler != null){            Message.obtain(handler, what, obj).sendToTarget();        }    }    void ReceiveFile(){        try{            Socket name = server.accept();            InputStream nameStream = name.getInputStream();            InputStreamReader streamReader = new InputStreamReader(nameStream);            BufferedReader br = new BufferedReader(streamReader);            String fileName = br.readLine();            br.close();            streamReader.close();            nameStream.close();            name.close();            SendMessage(0, "正在接收:" + fileName);            Socket data = server.accept();            InputStream dataStream = data.getInputStream();            String savePath = Environment.getExternalStorageDirectory().getPath() + "/" + fileName;            FileOutputStream file = new FileOutputStream(savePath, false);            byte[] buffer = new byte[1024];            int size = -1;            while ((size = dataStream.read(buffer)) != -1){                file.write(buffer, 0 ,size);            }            file.close();            dataStream.close();            data.close();            SendMessage(0, fileName + "接收完成");        }catch(Exception e){            SendMessage(0, "接收错误:\n" + e.getMessage());        }    }    public void SendFile(ArrayList<String> fileName, ArrayList<String> path, String ipAddress, int port){        try {            for (int i = 0; i < fileName.size(); i++){                Socket name = new Socket(ipAddress, port);                OutputStream outputName = name.getOutputStream();                OutputStreamWriter outputWriter = new OutputStreamWriter(outputName);                BufferedWriter bwName = new BufferedWriter(outputWriter);                bwName.write(fileName.get(i));                bwName.close();                outputWriter.close();                outputName.close();                name.close();                SendMessage(0, "正在发送" + fileName.get(i));                Socket data = new Socket(ipAddress, port);                OutputStream outputData = data.getOutputStream();                FileInputStream fileInput = new FileInputStream(path.get(i));                int size = -1;                byte[] buffer = new byte[1024];                while((size = fileInput.read(buffer, 0, 1024)) != -1){                    outputData.write(buffer, 0, size);                }                outputData.close();                fileInput.close();                data.close();                SendMessage(0, fileName.get(i) + "  发送完成");            }            SendMessage(0, "所有文件发送完成");        } catch (Exception e) {            SendMessage(0, "发送错误:\n" + e.getMessage());        }     }}