从安卓应用程序到电脑的SSHing

Question

我遵循了一些关于构建ssh应用程序的在线教程，但不幸的是，生成的应用程序可以很好地编译和构建，但不能正常运行。我正在尝试使用联想TAB A7连接到运行ubuntu的电脑。使用的IDE是android studio。该计算机安装了ssh服务器，并且以前通过SSH从其他计算机进行过控制。我在这个应用程序中输入的任何命令都不起作用。我还没有接触布局文件，因为我现在只是尝试发送ssh命令，所以它只是hello world的默认设置。任何帮助都将不胜感激！

android清单文件如下：

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="robotics.c">
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:hardwareAccelerated="true"
        android:theme="@style/AppTheme">

        <activity android:name="main">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity java文件如下：

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import java.io.ByteArrayOutputStream;
import java.util.Properties;
public class mainmenu extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mainmenu);
        new AsyncTask<Integer, Void, Void>() {
            @Override
            protected Void doInBackground(Integer... params) {
                try {
                    executeRemoteCommand("d46", "password", "192.168.0.209", 22);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }
        }.execute(1);
    }

    public static String executeRemoteCommand(String username, String password, String hostname, int port)
            throws Exception {
        JSch jsch = new JSch();
        Session session = jsch.getSession(username, hostname, port);
        session.setPassword(password);

        // Avoid asking for key confirmation
        Properties prop = new Properties();
        prop.put("StrictHostKeyChecking", "no");
        session.setConfig(prop);

        session.connect();

        // SSH Channel
        ChannelExec channelssh = (ChannelExec)
                session.openChannel("exec");
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        channelssh.setOutputStream(baos);

        // Execute command
        channelssh.setCommand("nohup python /home/d46/catkin_ws/control/py_script/controller_walking.py");
        //System.out.print("cd /home/pi/Desktop | nohup python red.py");
        channelssh.connect();
        channelssh.disconnect();

        return baos.toString();
    }

LogCat输出如下：

 08-03 10:03:30.599 21960-21960/? E/cutils: to chown(/mnt/shell/emulated/0, 0, 0)
    08-03 10:03:30.600 21960-21960/? E/cutils: to chown(/mnt/shell/emulated/obb, 0, 0)
    08-03 10:03:30.601 21960-21960/? E/cutils: to chown(/storage/emulated/0/Android, 0, 0)
    08-03 10:03:30.602 21960-21960/? E/cutils: to chown(/storage/emulated/0/Android/obb, 0, 0)
    08-03 10:03:30.635 21960-21960/robotics.c E/Trace: error opening trace file: No such file or directory (2)
    08-03 10:03:30.681 21960-21960/robotics.cW/asset: AssetManager-->addDefaultAssets CIP path not exsit!
    08-03 10:03:30.699 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve interface method 16064: Landroid/view/Window$Callback;.onProvideKeyboardShortcuts (Ljava/util/List;Landroid/view/Menu;I)V
    08-03 10:03:30.699 21960-21960/robotics.c W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
    08-03 10:03:30.699 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve interface method 16066: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
    08-03 10:03:30.699 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve interface method 16070: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
    08-03 10:03:30.700 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 477: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
    08-03 10:03:30.701 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 499: Landroid/content/res/TypedArray;.getType (I)I
    08-03 10:03:30.709 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 268: Landroid/content/Context;.createDeviceProtectedStorageContext ()Landroid/content/Context;
    08-03 10:03:30.710 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 273: Landroid/content/Context;.getCodeCacheDir ()Ljava/io/File;
    08-03 10:03:30.710 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 274: Landroid/content/Context;.getColor (I)I
    08-03 10:03:30.710 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 275: Landroid/content/Context;.getColorStateList (I)Landroid/content/res/ColorStateList;
    08-03 10:03:30.710 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 277: Landroid/content/Context;.getDataDir ()Ljava/io/File;
    08-03 10:03:30.710 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 278: Landroid/content/Context;.getDrawable (I)Landroid/graphics/drawable/Drawable;
    08-03 10:03:30.711 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 280: Landroid/content/Context;.getExternalCacheDirs ()[Ljava/io/File;
    08-03 10:03:30.711 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 282: Landroid/content/Context;.getExternalFilesDirs (Ljava/lang/String;)[Ljava/io/File;
    08-03 10:03:30.711 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 285: Landroid/content/Context;.getNoBackupFilesDir ()Ljava/io/File;
    08-03 10:03:30.711 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 287: Landroid/content/Context;.getObbDirs ()[Ljava/io/File;
    08-03 10:03:30.711 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 298: Landroid/content/Context;.isDeviceProtectedStorage ()Z
    08-03 10:03:30.747 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 16496: Landroid/widget/FrameLayout;.startActionModeForChild (Landroid/view/View;Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
    08-03 10:03:30.755 21960-21960/robotics.cW/dalvikvm: VFY: unable to resolve virtual method 275: Landroid/content/Context;.getColorStateList (I)Landroid/content/res/ColorStateList;
    08-03 10:03:30.761 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 440: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
    08-03 10:03:30.761 21960-21960/robotics.c W/dalvikvm: VFY: unable to resolve virtual method 442: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
    08-03 10:03:30.775 21960-21960/robotics.c E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
    08-03 10:03:30.775 21960-21960/robotics.cW/dalvikvm: VFY: unable to resolve instanceof 148 (Landroid/graphics/drawable/RippleDrawable;) in Landroid/support/v7/widget/AppCompatImageHelper;
    08-03 10:03:30.843 21960-21960/robotics.c E/linker: load_library(linker.cpp:759): library "libmaliinstr.so" not found

                                                                      [ 08-03 10:03:30.845 21960:0x55c8 E/         ]
                                                                      appName=robotics.c, acAppName=com.android.cts.openglperf

                                                                      [ 08-03 10:03:30.845 21960:0x55c8 E/         ]
                                                                      0

                                                                      [ 08-03 10:03:30.845 21960:0x55c8 E/         ]
                                                                      appName=robotics.c, acAppName=com.android.browser

                                                                      [ 08-03 10:03:30.845 21960:0x55c8 E/         ]
                                                                      0
    08-03 10:05:00.907 21960-21981/robotics.c W/System.err: com.jcraft.jsch.JSchException: java.net.SocketTimeoutException: failed to connect to /192.168.0.201 (port 22) after 90000ms
    08-03 10:05:00.908 21960-21981/robotics.c W/System.err:     at com.jcraft.jsch.Util.createSocket(Util.java:349)
    08-03 10:05:00.908 21960-21981/robotics.c W/System.err:     at com.jcraft.jsch.Session.connect(Session.java:215)
    08-03 10:05:00.910 21960-21981/robotics.c W/System.err:     at com.jcraft.jsch.Session.connect(Session.java:183)
    08-03 10:05:00.910 21960-21981/robotics.c W/System.err:     at robotics.c.mainmenu.executeRemoteCommand(mainmenu.java:44)
    08-03 10:05:00.910 21960-21981/robotics.c W/System.err:     at rrobotics.c.mainmenu$1.doInBackground(mainmenu.java:24)
    08-03 10:05:00.911 21960-21981/robotics.c W/System.err:     at robotics.c.mainmenu$1.doInBackground(mainmenu.java:20)
    08-03 10:05:00.911 21960-21981/robotics.c W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:287)
    08-03 10:05:00.911 21960-21981/robotics.c W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
    08-03 10:05:00.911 21960-21981/robotics.c W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
    08-03 10:05:00.914 21960-21981/robotics.c W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
    08-03 10:05:00.915 21960-21981/robotics.c W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
    08-03 10:05:00.916 21960-21981/robotics.c W/System.err:     at java.lang.Thread.run(Thread.java:838)
    08-03 10:05:00.916 21960-21981/robotics.c W/System.err: Caused by: java.net.SocketTimeoutException: failed to connect to /192.168.0.201 (port 22) after 90000ms
    08-03 10:05:00.917 21960-21981/robotics.c W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:176)
    08-03 10:05:00.918 21960-21981/robotics.cW/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:112)
    08-03 10:05:00.918 21960-21981/robotics.c W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
    08-03 10:05:00.918 21960-21981/robotics.c W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    08-03 10:05:00.918 21960-21981/robotics.c W/System.err:     at java.net.Socket.startupSocket(Socket.java:578)
    08-03 10:05:00.918 21960-21981/robotics.c W/System.err:     at java.net.Socket.tryAllAddresses(Socket.java:130)
    08-03 10:05:00.919 21960-21981/robotics.c W/System.err:     at java.net.Socket.<init>(Socket.java:180)
    08-03 10:05:00.919 21960-21981/robotics.c W/System.err:     at java.net.Socket.<init>(Socket.java:152)
    08-03 10:05:00.919 21960-21981/robotics.c W/System.err:     at com.jcraft.jsch.Util.createSocket(Util.java:343)
    08-03 10:05:00.919 21960-21981/robotics.c W/System.err:     ... 11 more

Answer 1

我解决这个问题的方法是使用另一款设备-a nexus，它的API为22，而联想平板电脑的API为17 :)软件运行得很好，这只是一个硬件故障。