[Q] How can I install zip programmatically from an app - Android Q&A, Help & Troubleshooting

Hi, I'm trying to build an app which will automatically reboot recovery and flash a zip from my sd card.
This app can use system app permission since I am going to use it as a system app,
How can I do this?
I tried this code
Code:
File zip = new File("/sdcard/test.zip");
if(zip.exists()) {
Toast.makeText(context,"ZIP EXIST!",Toast.LENGTH_LONG).show();
Process p = Runtime.getRuntime().exec("sh");
OutputStream os = p.getOutputStream();
os.write("mkdir -p /cache/recovery/\n".getBytes());
os.write("echo 'boot-recovery' >/cache/recovery/command\n".getBytes());
String cmd = "echo '--update_package=/sdcard/test.zip' >> /cache/recovery/command\n";
os.write(cmd.getBytes());
os.flush();
// Trigger the reboot
PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
powerManager.reboot("recovery");
}
else{
Toast.makeText(context,"ZIP NOT EXIST!",Toast.LENGTH_LONG).show();
}
I also tried this code:
Code:
Process p = Runtime.getRuntime().exec("/system/bin/sh");
OutputStream os = p.getOutputStream();
os.write("echo 'boot-recovery ' > /cache/recovery/command".getBytes());
os.write("echo '--update_package=/sdcard/test.zip' >> /cache/recovery/command".getBytes());
os.write("echo '--wipe_cache' >> /cache/recovery/command".getBytes());
os.write("echo 'reboot' >> /cache/recovery/command".getBytes());
os.write("reboot recovery".getBytes());
os.flush();
PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
powerManager.reboot("recovery");
But all it does is to reboot recovery, it does not flash my zip.
Please help.

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Did you solve it?

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You cannot
You cannot have an app unmounting and wiping /system while keeping android running. You HAVE to reboot to recovery to install zips.