来自相同字符串输入的意外不同结果

Question

我有一个从外部源接收输入的 BroadcastReceiver。

此接收器随后必须像 "mouse-like" 程序一样运行并向系统发送输入事件。我有 Root 权限。

我的问题是，当我发送 "input tap 275 410" 等字符串时，程序运行正常，即使我拆分 "input" + " tap" + " 275" + " 410" 等字符串，它仍然有效...

然而，当我assemble字符串为所需的：

"input " + CursorSystem.command + " " + coords[0] + " " + coords[1]

然后什么也没有发生...调试时，所有被监视的字符串完全相同（减去位置）：

value = {char[26]@830031306976}  0 = 'i' 105 1 = 'n' 110 2 = 'p' 112 3 = 'u' 117 4 = 't' 116 5 = ' ' 32 6 = 't' 116 7 = 'a' 97 8 = 'p' 112 9 = ' ' 32 10 = '2' 50 11 = '7' 55 12 = '5' 53 13 = ' ' 32 14 = '4' 52 15 = '1' 49 16 = '0' 48 17 = '\u0000' 0 18 = '\u0000' 0 19 = '\u0000' 0 20 = '\u0000' 0 21 = '\u0000' 0 22 = '\u0000' 0 23 = '\u0000' 0 24 = '\u0000' 0 25 = '\u0000' 0

我想要一些指导或属性来学习，因为我的结果并不有效。据我所知，这不是权限问题，也不是线程问题，因为日志显示了权限请求（和授予），只要执行接收器，线程就会存在（但如果我调试时间太长，然后在 [30+ 秒])

后被杀死

The Receiver.onReceive:

public void onReceive(Context context, Intent intent) {
    String command = intent.getStringExtra("command");
    String touch = intent.getStringExtra("touch");
    if (Executor.isRootAvailable()) {
        Executor executor = new Executor();
        ArrayList<String> commands = new ArrayList<>();
        if (command != null) {
            if (command.length() > 0) {
                if (commands.add("input " + command)) {
                    executor.execute(commands);
                }
            }
        } else if (touch != null) {
            if (CursorSystem.isAlive) { // Always true for the executions
                CursorSystem.doInput();
                if (CursorSystem.state == CursorSystem.STATE) { // Always true for the executions
                    int[] coords = CursorSystem.coordinates;
                    if (coords != null) {
// This line is where (I guess) that the problem lies.
// CursorSystem.command is "tap", coords[0] and coords[1] is the result of (a view).getLocationOnScreen(coordinates)
// It results in a 2 positions int array with (x, y) coordinates, these values are always correct.
                        if (commands.add("input " + CursorSystem.command + " " + coords[0] + " " + coords[1])) {
                            executor.execute(commands);
                            CursorSystem.doInput();
                        } else {
                            // error...
                        }
                    } else {
                        // error...
                    }
                } else {
                    // error...
                }
            } else {
                error...
            }
        } else {
            error...
        }
    } else {
        error...
    }
}

The Executor.execute:

public final boolean execute(ArrayList<String> commands) {
    boolean resp = false;
    try {
        if (commands != null && commands.size() > 0) {
            Process suProcess = Runtime.getRuntime().exec("su");
            DataOutputStream dataOutputStream = new DataOutputStream(suProcess.getOutputStream());
            for (String currCommand : commands) {
                dataOutputStream.writeBytes(currCommand);
                dataOutputStream.writeBytes("\n");
                dataOutputStream.flush();
            }
            dataOutputStream.writeBytes("exit\n");
            dataOutputStream.flush();
            try {
                int suProcessRetval = suProcess.waitFor();
                return (suProcessRetval != 255); // Always yields 0
            } catch (Exception ex) {
                // errors...
            }
        } else {
            // error...
        }
    } catch (IOException ex) {
        Log.w(TAG, "IOException: ", ex);
    } catch (SecurityException ex) {
        Log.w(TAG, "SecurityException: ", ex);
    } catch (Exception ex) {
        Log.w(TAG, "Generic Exception: ", ex);
    }
    return resp;
}

Answer 1

替换

 if (commands.add("input " + CursorSystem.command + " " + coords[0] + " " + coords[1])) {
                            executor.execute(commands);
                            CursorSystem.doInput();
                        }

和

String newCommand = "input " + CursorSystem.command + " " + coords[0] + " " + coords[1];
newCommand = newCommand.replace("\u0000", "").replace("\u0000", "");// removes NUL chars and backslash+u0000
if(commands.add(newCommand)){
   executor.execute(commands);
   CursorSystem.doInput();
   }

Answer 2

任何感兴趣的人：

发现的问题是 CursorSystem 使用了 ImageViews，它帮助用户 "target" 需要什么交互（以及在哪里）。在执行过程中，可以接收命令，并将图像移动到命令发生的位置，因此"receiving"事件。

添加以下标志：

.LayoutParams.FLAG_NOT_FOCUSABLE
.LayoutParams.FLAG_NOT_TOUCHABLE
.LayoutParams.FLAG_LAYOUT_NO_LIMITS

允许系统不将视图视为可交互的，以及 "draw" 它们在边界之外，以便用户可以 "swipe" 设备隐藏菜单，以及单击可能不存在的目标。这导致一些 "Launcher" 程序拦截了 MotionEvent，什么也不做。

命令执行成功，只是没有显示结果，导致我们将其解释为"doing nothing"。

来自相同字符串输入的意外不同结果

Unexpected different results from the same String input

android

linux

input

broadcastreceiver

runtime.exec