如何调试 Android/GDB/Qt 问题？

Question

几个月来，我一直在使用 Qt 开发 Android 应用程序。我以前可以在 Qt Creator 中毫无问题地调试，但现在调试器无法启动。部署过程有效 - 可以从设备 GUI 启动应用程序。

样例工程搭建，可以正常调试。

我正在使用 NDK 10e，因为后来的任何事情都会让 Creator 感到困惑，这告诉我 Qt 人员没有使用最近的构建。

我有最新版本的 SDK，在 OS X 上开发。

调试器日志窗口结束于：

~"Loaded symbols for /Users/tjdaniel/projects/qt/5.6.0/plugins/sensors/libqtsensors_android.so\n"
~"Reading symbols from /Users/tjdaniel/projects/build/localization/android/Debug/liblocalization.so..."
sReading /Users/tjdaniel/projects/build/localization/android/Debug/liblocalization.so......

dHANDLE GDB ERROR: The gdb process was ended forcefully
dGDB PROCESS FINISHED, status 1, exit code 11
dNOTE: ENGINE ILL ******

这是 adb logcat 的输出：

W/linker  (12790): libqtforandroid.so: unused DT entry: type 0x1d arg 0x8d9a
W/linker  (12790): Unsupported flags DT_FLAGS_1=0x81
I/Qt      (12790): qt start
W/linker  (12790): libqandroidbearer.so: unused DT entry: type 0x1d arg 0x174f
W/linker  (12790): Unsupported flags DT_FLAGS_1=0x81
W/linker  (12790): libqtmedia_android.so: unused DT entry: type 0x1d arg 0x51da
W/linker  (12790): Unsupported flags DT_FLAGS_1=0x81
W/linker  (12790): libqtsensors_android.so: unused DT entry: type 0x1d arg 0x1076
W/linker  (12790): Unsupported flags DT_FLAGS_1=0x81
I/Qt      (12790): Sensors start
W/linker  (12790): liblocalization.so: unused DT entry: type 0x1d arg 0x29f5f4
D/        (12790): (null):0 ((null)): QML debugging is enabled. Only use this in a safe environment.
I/Qt JAVA (12790): DEBUGGER: extra parameters: Bundle[{debug_ping=true, gdbserver_socket=/data/data/org.qtproject.example.localization/debug-socket, qml_debug=true, gdbserver_command=/data/data/org.qtproject.example.localization/lib/libgdbserver.so --multi +/data/data/org.qtproject.example.localization/debug-socket, qmljsdebugger=port:56956,block,services:DebugMessages,QmlDebugger,V8Debugger,QmlInspector, ping_socket=org.qtproject.example.localization.ping_pong_socket}]
I/Qt JAVA (12790): DEBUGGER: removing gdb socket /data/data/org.qtproject.example.localization/debug-socket
I/Qt JAVA (12790): DEBUGGER: starting /data/data/org.qtproject.example.localization/lib/libgdbserver.so --multi +/data/data/org.qtproject.example.localization/debug-socket
I/Qt JAVA (12790): DEBUGGER: gdbserver started
I/Qt JAVA (12790): DEBUGGER: waiting for socket at /data/data/org.qtproject.example.localization/debug-socket, attempt 0
I/Qt JAVA (12790): DEBUGGER: waiting for socket at /data/data/org.qtproject.example.localization/debug-socket, attempt 1
I/Qt JAVA (12790): DEBUGGER: socket ok
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Debug socket accepted
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/Qt JAVA (12790): DEBUGGER: Waiting for debug socket connect
I/Qt JAVA (12790): DEBUGGER: go to sleep
I/ConfigService( 1968): onDestroy
W/ActivityManager(  845): Launch timeout has expired, giving up wake lock!

关于如何调试的任何建议？无法使用调试器正在杀死我。我已经擦除并重新安装了与 Qt 相关的所有内容。不走运。

Answer 1

我也遇到了同样的问题，就是使用的 SDK 工具对 QT 的支持不好。安装 25.2.5 工具后，就像 here 说的那样，它工作了。

Answer 2

我遇到了同样的问题，截至今天，我发现的唯一方法是在您的 AndroidManifest.xml 中将 Target android SDK 设置为 API 23 (Android 6) 或更低

Answer 3

我遇到了同样的问题 XD：

1. 确保双方（App 和 IDE）没有被任何 防火墙。
2. 确保您的应用在 IDE 连接到 GNU 调试服务器之前不会退出

以下是单机版Qt调试服务器源码（xd/DebugServer.java）：

package xd;

//beaware: before call to "xd.DebugServer.start();" Gdb Server:
//  Ensure all native libraries you want debug break in are loaded
//  just add to class that calls "start" static initalizer sample:
//      static { System.loadLibrary("tun2http"); } //this may load "libs/armeabi-v7a/libtun2http.so"
//  Ensure both sides (this App and IDE) are NOT blocked by any firewall
//
//you can ignore signals using below (but may need to change SIG33):
//handle SIG33 nostop noprint noignore pass

import android.util.Log;
import android.content.pm.PackageManager;
import android.content.pm.ApplicationInfo;
import android.net.LocalServerSocket;

import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.DataOutputStream;

public class DebugServer {
    public static final String TAG = "XD_GDB"; // string used for Log.x (the colon helps cut out false positives)
    private static Process m_debuggerProcess = null; // debugger process

    private static void debugLog(String msg) {
        Log.i(TAG, msg);
    }

    //do not use this or IDE will fail to connect to debug server
    public static String flushLog() {
        try {
            String command = "logcat -d";

            Process process = Runtime.getRuntime().exec(command);
            BufferedReader bufferedReader = new BufferedReader(
                new InputStreamReader(process.getInputStream()));
            StringBuilder log=new StringBuilder();
            String line = "";
            while ((line = bufferedReader.readLine()) != null) {
                log.append(line + System.lineSeparator());
            }
            //process.waitFor();
            bufferedReader.close();
            return log.toString();
        } catch (IOException e) {
             // Handle Exception
        }
        return "";
    }

    private static class DebugWaitRunnable implements Runnable {

        public DebugWaitRunnable(String pingPongSocket) throws  IOException {
            socket = new LocalServerSocket(pingPongSocket);
        }

        public boolean wasFailure;
        private LocalServerSocket socket;

        public void run() {
            final int napTime = 200; // milliseconds between file accesses
            final int timeOut = 5000; // ms until we give up on ping and pong
            final int maxAttempts = timeOut / napTime;

            try {
                android.net.LocalSocket connectionFromClient = socket.accept();
                debugLog("Debug socket accepted");
                BufferedReader inFromClient =
                        new BufferedReader(new InputStreamReader(connectionFromClient.getInputStream()));
                DataOutputStream outToClient = new DataOutputStream(connectionFromClient.getOutputStream());
                outToClient.writeBytes("" + android.os.Process.myPid());

                for (int i = 0; i < maxAttempts; i++) {
                    String clientData = inFromClient.readLine();
                    debugLog("Incoming socket " + clientData);
                    if (!clientData.isEmpty())
                        break;

                    if (connectionFromClient.isClosed()) {
                        wasFailure = true;
                        break;
                    }
                    Thread.sleep(napTime);
                }
            } catch (IOException ioEx) {
                ioEx.printStackTrace();
                wasFailure = true;
                Log.e(TAG,"Can't start debugger" + ioEx.getMessage());
            } catch (InterruptedException interruptEx) {
                wasFailure = true;
                Log.e(TAG,"Can't start debugger" + interruptEx.getMessage());
            }
        }

        public void shutdown() throws IOException
        {
            wasFailure = true;
            try {
                socket.close();
            } catch (IOException ignored) { }
        }
    };

//beaware: before call to "start" Gdb Server:
//  Ensure all native libraries you want debug break in are loaded
//  just add to class that calls "xd.DebugServer.start();" static initalizer sample:
//      static { System.loadLibrary("tun2http"); } //this may load "libs/armeabi-v7a/libtun2http.so"
//  Ensure both sides (this App and IDE) are NOT blocked by any firewall
    public static boolean start(android.app.Activity activity) {
    try {
        //System.loadLibrary("gnustl_shared");

        final int napTime = 200; // milliseconds between file accesses
        final int timeOut = 30000; // ms until we give up on ping and pong
        final int maxAttempts = timeOut / napTime;

        PackageManager pm = activity.getPackageManager();
        ApplicationInfo appInfo = pm.getApplicationInfo(
            activity.getPackageName(), android.content.pm.PackageManager.GET_CONFIGURATIONS
        );

        final String packagePath = appInfo.dataDir + "/";
        //using constant '"/data/data/"' instate of 'appInfo.dataDir+"/"' since that does not work old code was "extras.getString("gdbserver_socket");"
        final String gdbserverSocket = "/data/data/" + appInfo.packageName + "/debug-socket";
        final String gdbserverCommand = packagePath + "lib/libgdbserver.so --multi +" + gdbserverSocket;

        debugLog("removing gdb socket " + gdbserverSocket);
        new File(gdbserverSocket).delete();

        debugLog("starting " + gdbserverCommand);
        m_debuggerProcess = Runtime.getRuntime().exec(gdbserverCommand);
        debugLog("gdbserver started");

        int i;
        for (i = 0; i < maxAttempts; ++i) {
            debugLog("waiting for socket at " + gdbserverSocket + ", attempt " + i);
            File file = new File(gdbserverSocket);
            if (file.exists()) {
                file.setReadable(true, false);
                file.setWritable(true, false);
                file.setExecutable(true, false);
                break;
            }
            Thread.sleep(napTime);
        }

        if (i == maxAttempts) {
            debugLog("time out when waiting for debug socket");
            return false;
        }

        debugLog("socket ok");

        final String pingSocket = appInfo.packageName + ".ping_pong_socket";
        debugLog("pingSocket: " + pingSocket);
        DebugWaitRunnable runnable = new DebugWaitRunnable(pingSocket);
        Thread waitThread = new Thread(runnable);
        waitThread.start();

        debugLog("Waiting for debug socket connect");
        for (i = 0; i < maxAttempts && waitThread.isAlive(); ++i) {
            if(i % 10 == 0)
                debugLog("Waiting attempt: " + i);
            Thread.sleep(napTime);
        }

        if (i == maxAttempts) {
            debugLog("time out when waiting for ping socket");
            runnable.shutdown();
            return false;
        }

        if (runnable.wasFailure) {
            debugLog("Could not connect to debug client");
            return false;
        } else {
            debugLog("Got pid acknowledgment");
        }

        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
    }

    public static void stop(android.app.Activity activity) {
        if (m_debuggerProcess != null)
            m_debuggerProcess.destroy();
        System.exit(0);// FIXME remove it or find a better way
    }
} //class GdbServer