execute file from defined directory with Runtime.getRuntime().exec

Question

I just want to execute my file from a specific folder. in my case /data/data/my-package/files/. So i tried : ``` Process process2=Runtime.getRuntime().exec("cd /data/data/my-package/files/"); process2.waitFor(); process2=Runtime.getRuntime().exec("./myfile"); ``` It doesn't work. could anyone tell me please the right way to do that . Thanks

Accepted Answer

It should be possible to call the executable with a specific working directory using `Runtime.exec(String command, String[] envp, File dir)`

as follows:

```
Process process2=Runtime.getRuntime().exec("/data/data/my-package/files/myfile",
        null, new File("/data/data/my-package/files"));
```

maybe without the full path to `myfile`

```
Process process2=Runtime.getRuntime().exec("myfile",
        null, new File("/data/data/my-package/files"));
```

`Context#getFilesDir()` instead of hardcoding the path should work too and is safer / cleaner than specifying the path yourself since it is not guaranteed that `/data/data/..` is always the correct path for all devices.

```
Process process2=Runtime.getRuntime().exec("myfile",
        null, getFilesDir()));
```

The problem with `cd somewhere` is that the directory is changed for a different Process so the second call to `exec` in a new Process does not see the change.

execute file from defined directory with Runtime.getRuntime().exec

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