minetest/build/android/app/src/main/java/net/minetest/minetest/MainActivity.java

/*
Minetest
Copyright (C) 2014-2020 MoNTE48, Maksim Gamarnik <MoNTE48@mail.ua>
Copyright (C) 2014-2020 ubulem,  Bektur Mambetov <berkut87@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

package net.minetest.minetest;

import android.Manifest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MainActivity extends AppCompatActivity {
	private final static int versionCode = BuildConfig.VERSION_CODE;
	private final static int PERMISSIONS = 1;
	private static final String[] REQUIRED_SDK_PERMISSIONS =
			new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE};
	private static final String SETTINGS = "MinetestSettings";
	private static final String TAG_VERSION_CODE = "versionCode";
	private ProgressBar mProgressBar;
	private TextView mTextView;
	private SharedPreferences sharedPreferences;
	private final BroadcastReceiver myReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			int progress = 0;
			if (intent != null)
				progress = intent.getIntExtra(UnzipService.ACTION_PROGRESS, 0);
			if (progress >= 0) {
				if (mProgressBar != null) {
					mProgressBar.setVisibility(View.VISIBLE);
					mProgressBar.setProgress(progress);
				}
				mTextView.setVisibility(View.VISIBLE);
			} else
				startNative();
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		IntentFilter filter = new IntentFilter(UnzipService.ACTION_UPDATE);
		registerReceiver(myReceiver, filter);
		mProgressBar = findViewById(R.id.progressBar);
		mTextView = findViewById(R.id.textView);
		sharedPreferences = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
			checkPermission();
		else
			checkAppVersion();
	}

	private void checkPermission() {
		final List<String> missingPermissions = new ArrayList<>();
		for (final String permission : REQUIRED_SDK_PERMISSIONS) {
			final int result = ContextCompat.checkSelfPermission(this, permission);
			if (result != PackageManager.PERMISSION_GRANTED)
				missingPermissions.add(permission);
		}
		if (!missingPermissions.isEmpty()) {
			final String[] permissions = missingPermissions
					.toArray(new String[0]);
			ActivityCompat.requestPermissions(this, permissions, PERMISSIONS);
		} else {
			final int[] grantResults = new int[REQUIRED_SDK_PERMISSIONS.length];
			Arrays.fill(grantResults, PackageManager.PERMISSION_GRANTED);
			onRequestPermissionsResult(PERMISSIONS, REQUIRED_SDK_PERMISSIONS, grantResults);
		}
	}

	@Override
	public void onRequestPermissionsResult(int requestCode,
									@NonNull String[] permissions, @NonNull int[] grantResults) {
		if (requestCode == PERMISSIONS) {
			for (int grantResult : grantResults) {
				if (grantResult != PackageManager.PERMISSION_GRANTED) {
					Toast.makeText(this, R.string.not_granted, Toast.LENGTH_LONG).show();
					finish();
				}
			}
			checkAppVersion();
		}
	}

	private void checkAppVersion() {
		if (sharedPreferences.getInt(TAG_VERSION_CODE, 0) == versionCode)
			startNative();
		else
			new CopyZipTask(this).execute(getCacheDir() + "/Minetest.zip");
	}

	private void startNative() {
		sharedPreferences.edit().putInt(TAG_VERSION_CODE, versionCode).apply();
		Intent intent = new Intent(this, GameActivity.class);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK);
		startActivity(intent);
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		unregisterReceiver(myReceiver);
	}
}