BaseActivity.java

/*******************************************************************************
 * This file is part of RedReader.
 *
 * RedReader is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * RedReader 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with RedReader.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/

package org.quantumbadger.redreader.activities;

import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.view.WindowManager;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import org.quantumbadger.redreader.R;
import org.quantumbadger.redreader.common.General;
import org.quantumbadger.redreader.common.GlobalExceptionHandler;
import org.quantumbadger.redreader.common.PrefsUtility;
import org.quantumbadger.redreader.common.SharedPrefsWrapper;
import org.quantumbadger.redreader.common.TorCommon;

import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;

public abstract class BaseActivity extends AppCompatActivity
		implements SharedPrefsWrapper.OnSharedPreferenceChangeListener {

	private SharedPrefsWrapper mSharedPreferences;

	private static boolean closingAll = false;

	private final AtomicInteger mRequestIdGenerator = new AtomicInteger(10_000);

	private final HashMap<Integer, PermissionCallback> mPermissionRequestCallbacks
			= new HashMap<>();

	public interface PermissionCallback {
		void onPermissionGranted();

		void onPermissionDenied();
	}

	public void closeAllExceptMain() {
		closingAll = true;
		closeIfNecessary();
	}

	@Override
	protected void onCreate(final Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		mSharedPreferences = General.getSharedPrefs(this);

		if (PrefsUtility.pref_appearance_android_status()
				== PrefsUtility.AppearanceStatusBarMode.ALWAYS_HIDE) {
			getWindow().setFlags(
					WindowManager.LayoutParams.FLAG_FULLSCREEN,
					WindowManager.LayoutParams.FLAG_FULLSCREEN);
		}

		if (PrefsUtility.behaviour_block_screenshots()) {
			getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
		}

		if (PrefsUtility.pref_behaviour_keep_screen_awake()) {
			getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
		}

		mSharedPreferences.registerOnSharedPreferenceChangeListener(this);
		setOrientationFromPrefs();
		closeIfNecessary();

		GlobalExceptionHandler.handleLastCrash(this);
	}

	@Override
	protected void onResume() {
		super.onResume();
		setOrientationFromPrefs();
		closeIfNecessary();
		TorCommon.updateTorStatus();
	}


	@Override
	protected void onDestroy() {
		super.onDestroy();
		mSharedPreferences.unregisterOnSharedPreferenceChangeListener(this);
	}

	private void closeIfNecessary() {
		if (closingAll) {
			if (this instanceof MainActivity) {
				closingAll = false;
			} else {
				finish();
			}
		}
	}

	public final void requestPermissionWithCallback(
			@NonNull final String permission,
			@NonNull final PermissionCallback callback) {

		General.checkThisIsUIThread();

		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

			if (checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED) {
				callback.onPermissionGranted();

			} else {
				final int requestCode = mRequestIdGenerator.incrementAndGet();
				mPermissionRequestCallbacks.put(requestCode, callback);
				requestPermissions(new String[]{permission}, requestCode);
			}

		} else {
			callback.onPermissionGranted();
		}
	}

	@Override
	public final void onRequestPermissionsResult(
			final int requestCode,
			@NonNull final String[] permissions,
			@NonNull final int[] grantResults) {

		super.onRequestPermissionsResult(requestCode, permissions, grantResults);

		final PermissionCallback callback
				= mPermissionRequestCallbacks.remove(requestCode);

		if (callback == null) {
			return;
		}

		if (permissions.length != 1) {
			throw new RuntimeException("Unexpected permission result");
		}

		if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
			callback.onPermissionGranted();
		} else {
			callback.onPermissionDenied();
		}
	}

	private void setOrientationFromPrefs() {
		final PrefsUtility.ScreenOrientation orientation
				= PrefsUtility.pref_behaviour_screen_orientation();

		if (orientation == PrefsUtility.ScreenOrientation.AUTO) {
			//noinspection SourceLockedOrientationActivity
			setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);

		} else if (orientation == PrefsUtility.ScreenOrientation.PORTRAIT) {
			//noinspection SourceLockedOrientationActivity
			setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

		} else if (orientation == PrefsUtility.ScreenOrientation.LANDSCAPE) {
			//noinspection SourceLockedOrientationActivity
			setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
		}
	}


	protected void onSharedPreferenceChangedInner(
			final SharedPrefsWrapper prefs,
			final String key) {
		// Do nothing
	}

	@Override
	public void onSharedPreferenceChanged(
			@NonNull final SharedPrefsWrapper prefs,
			@NonNull final String key) {

		onSharedPreferenceChangedInner(prefs, key);

		if (key.equals(getString(R.string.pref_behaviour_screenorientation_key))) {
			setOrientationFromPrefs();
		}
	}
}