Proper app relaunch for stub

app/shared/src/main/java/com/topjohnwu/magisk/PhoenixActivity.java

@@ -0,0 +1,37 @@
+package com.topjohnwu.magisk;
+
+import android.app.Activity;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Process;
+
+import io.michaelrocks.paranoid.Obfuscate;
+
+// Inspired by https://github.com/JakeWharton/ProcessPhoenix
+
+@Obfuscate
+public class PhoenixActivity extends Activity {
+
+    private static final String PID_KEY = "pid";
+
+    public static void rebirth(Context context, String clzName) {
+        var intent = new Intent();
+        intent.setComponent(new ComponentName(context, clzName));
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.putExtra(PID_KEY, Process.myPid());
+        context.startActivity(intent);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Process.killProcess(getIntent().getIntExtra(PID_KEY, -1));
+        var intent = getPackageManager().getLaunchIntentForPackage(getPackageName());
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        startActivity(intent);
+        finish();
+        Runtime.getRuntime().exit(0);
+    }
+}