OpenPods/app/src/main/java/com/dosse/airpods/ui/MainActivity.java

package com.dosse.airpods.ui;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.dosse.airpods.R;
import com.dosse.airpods.receivers.StartupReceiver;
import com.dosse.airpods.utils.MIUIWarning;
import com.dosse.airpods.utils.PermissionUtils;

import java.util.Objects;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Check if Bluetooth LE is available on this device. If not, show an error
        BluetoothAdapter btAdapter = ((BluetoothManager)Objects.requireNonNull(getSystemService(Context.BLUETOOTH_SERVICE))).getAdapter();
        if (btAdapter == null || (btAdapter.isEnabled() && btAdapter.getBluetoothLeScanner() == null) || (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE))) {
            startActivity(new Intent(MainActivity.this, NoBTActivity.class));
            finish();

            return;
        }

        if (!PermissionUtils.checkAllPermissions(this)) {
            startActivity(new Intent(MainActivity.this, IntroActivity.class));
            finish();
        } else {
            StartupReceiver.startPodsService(getApplicationContext());
            //Warn MIUI users that their rom has known issues
            MIUIWarning.show(this);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        if (item.getItemId() == R.id.menu_ab_settings) {
            startActivity(new Intent(this, SettingsActivity.class)); // Settings icon clicked
            return true;
        }

        return false;
    }
}