android - 如何停止由 run.exec() 在 android 中启动的进程

Question

如何停止“ping”？以下代码是我尝试的方式，但失败了。

private class pingWifi implements Runnable {
           Process p = null;
    @Override
    public void run() {
        // TODO Auto-generated method stub
        /*
         * WifiInfo info=mWifiManager.getConnectionInfo(); int
         * ip=info.getIpAddress(); String ips=Formatter.formatIpAddress(ip);
         */
        System.out.println("pingWifi runnable");
        String[] shell = new String[] { "/system/bin/sh", "-c", " " };
        Runtime run = Runtime.getRuntime();

        shell[2] = "ping " + ipAddress;
        try {
            p = run.exec(shell);
            if (p.waitFor() != 0) {
                if (p.exitValue() == 1) {
                    byte[] buff = new byte[1024];
                    InputStream is = p.getErrorStream();
                    int c;
                    c = is.read(buff, 0, 1024);
                    System.out.println("ping error: " + new String(buff));
                }
            } else {
                byte[] buff = new byte[1024];
                InputStream is = p.getInputStream();
                int c;
                c = is.read(buff, 0, 1024);
                System.out.println("ping result: " + new String(buff));
                // wait for hardware
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }

    }
void stopProcess() {
        if (p != null) {
            p.destroy();
        }else{
            System.out.println("stopProcess: p==null");
        }
    }



    }
private pingWifi mpingWifi = new pingWifi();
    Thread wifiThread = new Thread(mpingWifi);
            wifiThread.start();

在 onPause 中我调用了 mpingWifi.stopProcess()，结果是“stopProcess: p==null”。而且我仍然可以在“ps”列表中找到 ping 进程。

我也想使用“pkill ping”命令。但 Android shell 不支持“pkill”命令。我的目标是在“主页或返回”键事件发生之前，ping 不会“停止”。谢谢!

Answer 1

尝试覆盖后退按钮按下并在其中调用 Process.destroy()。

例子:

public void onBackPressed() {
p.destroy();
}