Separate stub Magisk Manager to a module

stub/src/main/java/com/topjohnwu/magisk/BootLauncher.java

@@ -0,0 +1,16 @@
+package com.topjohnwu.magisk;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.text.TextUtils;
+
+public class BootLauncher extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        if (TextUtils.equals(intent.getAction(), Intent.ACTION_BOOT_COMPLETED)) {
+            Intent i = new Intent(context, MainActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            context.startActivity(i);
+        }
+    }
+}

stub/src/main/java/com/topjohnwu/magisk/MainActivity.java

@@ -0,0 +1,68 @@
+package com.topjohnwu.magisk;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Application;
+import android.os.Bundle;
+
+import com.topjohnwu.magisk.utils.APKInstall;
+import com.topjohnwu.net.Networking;
+import com.topjohnwu.net.ResponseListener;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.File;
+
+public class MainActivity extends Activity {
+
+    private static final String URL =
+            "https://raw.githubusercontent.com/topjohnwu/magisk_files/master/stable.json";
+
+    private String apkLink;
+
+    private void dlAPK() {
+        Application app = getApplication();
+        Networking.get(apkLink)
+                .getAsFile(new File(getFilesDir(), "manager.apk"), apk -> APKInstall.install(app, apk));
+        finish();
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Networking.init(this);
+        if (Networking.checkNetworkStatus(this)) {
+            Networking.get(URL)
+                    .setErrorHandler(((conn, e) -> finish()))
+                    .getAsJSONObject(new JSONLoader());
+        } else {
+            new AlertDialog.Builder(this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT)
+                    .setCancelable(false)
+                    .setTitle(R.string.app_name)
+                    .setMessage(R.string.no_internet_msg)
+                    .setNegativeButton(R.string.ok, (d, w) -> finish())
+                    .show();
+        }
+    }
+
+    class JSONLoader implements ResponseListener<JSONObject> {
+
+        @Override
+        public void onResponse(JSONObject json) {
+            try {
+                JSONObject manager = json.getJSONObject("app");
+                apkLink = manager.getString("link");
+                new AlertDialog.Builder(MainActivity.this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT)
+                        .setCancelable(false)
+                        .setTitle(R.string.app_name)
+                        .setMessage(R.string.upgrade_msg)
+                        .setPositiveButton(R.string.yes, (d, w) -> dlAPK())
+                        .setNegativeButton(R.string.no_thanks, (d, w) -> finish())
+                        .show();
+            } catch (JSONException e) {
+                finish();
+            }
+        }
+    }
+}