问题
I am trying to get my app to download an update from an ftp site, in the form of a new version of the apk. After download the apk should be installed silently, without any confirmation from a user. I have the download part under control. I can also do this with confirmation from the user. The problem is the silent update part.
From what I can tell the only way to do this is by installing the app as a system app. This is where I need some help.
I have tried alot of things. The most success I have had is the following:
- Rooting the device.
- Adding *android:sharedUserId="android.uid.system" to the manifest.
Adding the following permissions to the manifest:
android.permission.ACCESS_SUPERUSER and android.permission.INSTALL_PACKAGES
Signing the apk with Android Studio->Build->Generate Signed APK... using a signature generated like this:
./keytool-importkeypair -k google_certificate.keystore -p android -pk8 platform.pk8 -cert platform.x509.pem -alias platform
where I got the pk8 and pem files from the Android source mirror on GitHub.
- Moving the signed apk to system/app on the device and clicking install on it.
The first thing I get is a huge list of permissions that the app is requesting which I never did. So I guess this is the permissions a system app has, so far so good :)
The immediately after I get the message:
App not installed.
Google could not tell why this error occures, so I am asking here.
Am I on the right path?
Why was the app not installed?
回答1:
If you device is rooted you can execute this command:
pm install com.example.myapp
How to execute this command?
There are two ways:
Way #1:
Use RootTools library:
Command command = new Command(0, "pm install com.example.myapp") {
@Override
public void commandCompleted(int arg0, int arg1) {
Log.i(TAG, "App installation is completed");
}
@Override
public void commandOutput(int arg0, String line) {
}
@Override
public void commandTerminated(int arg0, String arg1) {
}
}
RootTools.getShell(true).add(command);
Way #2:
This way not requires libraries, but it's harder than first way.
//Start a new process with root privileges
Process process = Runtime.getRuntime().exec("su");
//Get OutputStream of su to write commands to su process
OutputStream out = process.getOutputStream();
//Your command
String cmd = "pm install com.example.myapp";
//Write the command to su process
out.write(cmd.getBytes());
//Flush the OutputStream
out.flush();
//Close the OutputStream
out.close();
//Wait until command
process.waitFor();
Log.i(TAG, "App installation is completed");
回答2:
So after a couple of years I got to that problem again, and I managed to solve it. So the most important part is rooting the phone properly: This was done with the SuperSU app.
After downloading the .apk file, a method similar to the following is used to install the update:
private Boolean Install(String path)
{
File file = new File(path);
if(file.exists()){
try {
Process proc = Runtime.getRuntime().exec(new String[]{"su","-c","pm install -r -d " + path});
proc.waitFor();
BufferedReader input = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
String line;
Boolean hasError = false;
while ((line = input.readLine()) != null) {
if(line.contains("Failure")){
hasError = true;
}
}
if(proc.exitValue() != 0 || hasError){
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
return false;
}
来源：https://stackoverflow.com/questions/31936361/install-android-system-app-silent-update-without-google-play-on-rooted-device