Android Studio TCP Server

  • Sonstige

Es gibt 6 Antworten in diesem Thema. Der letzte Beitrag () ist von schnibli.

    Android Studio TCP Server

    Hallo zusammen,

    Ich bin an einem Android Projekt dran und würde gerne TCP Nachrichten versenden:
    Gibt es da ein Tutorial?

    Bis jetzt besteht mein Projekt aus Buttons und Test-Funktionen:

    Quellcode

    1. final Button btn_play = (Button) rootview.findViewById(R.id.btn_play);
    2. final Button btn_stop = (Button) rootview.findViewById(R.id.btn_stop);
    3. final Button btn_pause = (Button) rootview.findViewById(R.id.btn_pause);
    4. final Button btn_next = (Button) rootview.findViewById(R.id.btn_next);
    5. final Button btn_back = (Button) rootview.findViewById(R.id.btn_back);
    6. final Button btn_run = (Button) rootview.findViewById(R.id.btn_run);
    8. btn_play.setOnClickListener(
    9. new Button.OnClickListener() {
    10. public void onClick(View v) {
    11. btn_play.setText("play");
    12. }
    13. }
    14. );
    15. btn_stop.setOnClickListener(
    16. new Button.OnClickListener() {
    17. public void onClick(View v) {
    18. btn_stop.setText("stop");
    19. }
    20. }
    21. );
    22. btn_pause.setOnClickListener(
    23. new Button.OnClickListener() {
    24. public void onClick(View v) {
    25. btn_pause.setText("Pause");
    26. }
    27. }
    28. );
    29. btn_back.setOnClickListener(
    30. new Button.OnClickListener() {
    31. public void onClick(View v) {
    32. btn_back.setText("Back");
    33. }
    34. }
    35. );

    Hallo Vielen Dank.

    Meine ersten Code versuche:

    Quellcode

    1. try {
    2. String sentence;
    3. String modifiedSentence;
    4. BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
    5. Socket clientSocket = null;
    7. clientSocket = new Socket("192.168.61.91", 8052);
    9. DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
    10. BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
    11. sentence = inFromUser.readLine();
    12. outToServer.writeBytes(sentence + '\n');
    13. modifiedSentence = inFromServer.readLine();
    14. System.out.println("FROM SERVER: " + modifiedSentence);
    15. clientSocket.close();
    17. } catch (IOException e) {
    18. e.printStackTrace();
    19. }
    21. }


    Nun heisst es:
    03-12 13:54:22.193 2356-2356/bmu_test.com.bmuapp W/System.err﹕ java.net.SocketException: socket failed: EACCES (Permission denied)

    Und wenn ich anschliessend bei Manifest folgendes hinzufüge:
    <uses-permission android:name="android.permission.INTERNET"/>

    Stürtzt die App ab:
    Spoiler anzeigen

    3-12 13:58:42.809 2532-2548/bmu_test.com.bmuapp D/﹕ HostConnection::get() New Host Connection established 0xa6ba4c70, tid 2548
    03-12 13:58:42.822 2532-2548/bmu_test.com.bmuapp I/OpenGLRenderer﹕ Initialized EGL, version 1.4
    03-12 13:58:42.853 2532-2548/bmu_test.com.bmuapp D/OpenGLRenderer﹕ Enabling debug mode 0
    03-12 13:58:42.884 2532-2548/bmu_test.com.bmuapp W/EGL_emulation﹕ eglSurfaceAttrib not implemented
    03-12 13:58:42.884 2532-2548/bmu_test.com.bmuapp W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa6b989e0, error=EGL_SUCCESS
    03-12 13:58:43.445 2532-2532/bmu_test.com.bmuapp I/Choreographer﹕ Skipped 32 frames! The application may be doing too much work on its main thread.
    03-12 13:58:46.034 2532-2532/bmu_test.com.bmuapp D/AndroidRuntime﹕ Shutting down VM
    03-12 13:58:46.034 2532-2532/bmu_test.com.bmuapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: bmu_test.com.bmuapp, PID: 2532
    android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
    at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
    at libcore.io.IoBridge.connect(IoBridge.java:122)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
    at java.net.Socket.startupSocket(Socket.java:590)
    at java.net.Socket.tryAllAddresses(Socket.java:128)
    at java.net.Socket.<init>(Socket.java:178)
    at java.net.Socket.<init>(Socket.java:150)
    at bmu_test.com.bmuapp.menu2_Fragment.onCreateView(menu2_Fragment.java:49)
    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5221)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
    03-12 13:58:46.150 2532-2544/bmu_test.com.bmuapp I/art﹕ Background partial concurrent mark sweep GC freed 605(94KB) AllocSpace objects, 1(16KB) LOS objects, 25% free, 2MB/2MB, paused 1.032ms total 111.886ms


    Ahh :)
    Hab jetzt mal was geändert jedoch Funktioniert es immer noch nicht :s
    Spoiler anzeigen

    Quellcode

    1. ​ public View onCreateView(LayoutInflater inflater,
    2. ViewGroup container, Bundle
    3. savedInstanceState) {
    4. tvServerMessage = (TextView) rootview.findViewById(R.id.textViewServerMessage);
    5. // Inflate the layout for this fragment
    6. View rootview = inflater.inflate(R.layout.menu2_layout,
    7. container, false);
    8. //Create an instance of AsyncTask
    9. ClientAsyncTask clientAST = new ClientAsyncTask();
    10. //Pass the server ip, port and client message to the AsyncTask
    11. clientAST.execute(new String[]{"192.168.61.91", "8052", "Hello from client"});
    13. final Button btn_play = (Button) rootview.findViewById(R.id.btn_play);
    14. final Button btn_stop = (Button) rootview.findViewById(R.id.btn_stop);
    15. final Button btn_pause = (Button) rootview.findViewById(R.id.btn_pause);
    16. final Button btn_next = (Button) rootview.findViewById(R.id.btn_next);
    17. final Button btn_back = (Button) rootview.findViewById(R.id.btn_back);
    18. final Button btn_run = (Button) rootview.findViewById(R.id.btn_run);
    20. btn_play.setOnClickListener(
    21. new Button.OnClickListener() {
    22. public void onClick(View v) {
    23. btn_play.setText("play");
    24. }
    25. }
    26. );
    27. btn_stop.setOnClickListener(
    28. new Button.OnClickListener() {
    29. public void onClick(View v) {
    30. btn_stop.setText("stop");
    31. }
    32. }
    33. );
    34. btn_pause.setOnClickListener(
    35. new Button.OnClickListener() {
    36. public void onClick(View v) {
    37. btn_pause.setText("Pause");
    38. }
    39. }
    40. );
    41. btn_back.setOnClickListener(
    42. new Button.OnClickListener() {
    43. public void onClick(View v) {
    44. btn_back.setText("Back");
    45. }
    46. }
    47. );
    48. btn_next.setOnClickListener(
    49. new Button.OnClickListener() {
    50. public void onClick(View v) {
    51. btn_next.setText("Next");
    52. }
    53. }
    54. );
    55. btn_run.setOnClickListener(
    56. new Button.OnClickListener() {
    57. public void onClick(View v) {
    58. btn_run.setText("Run");
    59. }
    60. }
    61. );
    62. /**
    63. * The class extends the Thread class so we can receive and send messages at the same time
    64. */
    66. return rootview;
    68. }
    70. class ClientAsyncTask extends AsyncTask<String, Void, String> {
    71. @Override
    72. protected String doInBackground(String... params) {
    73. String result = null;
    74. try {
    75. //Create a client socket and define internet address and the port of the server
    76. Socket socket = new Socket(params[0],
    77. Integer.parseInt(params[1]));
    78. //Get the input stream of the client socket
    79. InputStream is = socket.getInputStream();
    80. //Get the output stream of the client socket
    81. PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
    82. //Write data to the output stream of the client socket
    83. out.println(params[2]);
    84. //Buffer the data coming from the input stream
    85. BufferedReader br = new BufferedReader(
    86. new InputStreamReader(is));
    87. //Read data in the input buffer
    88. result = br.readLine();
    89. //Close the client socket
    90. socket.close();
    91. } catch (NumberFormatException e) {
    92. e.printStackTrace();
    93. } catch (UnknownHostException e) {
    94. e.printStackTrace();
    95. } catch (IOException e) {
    96. e.printStackTrace();
    97. }
    98. return result;
    99. }
    101. @Override
    103. protected void onPostExecute(String s) {
    105. //Write server message to the text view
    107. tvServerMessage.setText(s);
    108. }
    109. }
    [\spoiler]
    'android.view.View android.view.View.findViewById(int)' on a null object reference:s

    schnibli schrieb:

    'android.view.View android.view.View.findViewById(int)' on a null object reference:s



    tvServerMessage = (TextView) rootview.findViewById(R.id.textViewServerMessage);
    // Inflate the layout for this fragment
    View rootview = inflater.inflate(R.layout.menu2_layout, container, false);


    Fällt dir da nicht was auf?


    Bevor du das Layout nicht "inflated" hast, sind alle Views darauf NULL. Genau wie deine View rootview auch.

Facebook
Telefonspende