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@ü.li:Listing 1:MultiWindowDemoActivity.java

@li:package com.thomaskuenneth.multiwindowdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MultiWindowDemoActivity extends Activity {

    private static final String TAG =
            MultiWindowDemoActivity.class.getSimpleName();

    private final StringBuilder sb = new StringBuilder();

    private TextView tv;
    private ProgressBar pb;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.tv);
        pb = (ProgressBar) findViewById(R.id.pb);
        Button bt = (Button) findViewById(R.id.launch);
        bt.setOnClickListener(e -> {
            Intent i = new Intent(this, ChildActivity.class);
            i.setFlags(Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT |
                    Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(i);
        });
    }

    @Override
    protected void onStop() {
        super.onStop();
        pb.setVisibility(View.INVISIBLE);
        Log.d(TAG, "onStop()");
    }

    @Override
    protected void onStart() {
        super.onStart();
        updateTextView();
        pb.setVisibility(View.VISIBLE);
        Log.d(TAG, "onStart()");
    }

    @Override
    public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode) {
        Log.d(TAG, "onPictureInPictureModeChanged(): " +
                isInPictureInPictureMode);
    }

    @Override
    public void onMultiWindowModeChanged(boolean isInMultiWindowMode) {
        Log.d(TAG, "onMultiWindowModeChanged(): " +
                isInMultiWindowMode);
    }

    private void updateTextView() {
        sb.setLength(0);
        sb.append("isInMultiWindowMode(): ")
                .append(isInMultiWindowMode())
                .append("\n");
        sb.append("isInPictureInPictureMode(): ")
                .append(isInPictureInPictureMode())
                .append("\n");
        tv.setText(sb.toString());
    }
}

@ü.li:Listing 2: BundledNotificationDemoActivity.java

@li:package com.thomaskuenneth.bundlednotificationdemo;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.RemoteInput;
import android.content.Intent;
import android.graphics.drawable.Icon;
import android.os.Bundle;
import android.service.notification.StatusBarNotification;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Random;
import java.util.StringJoiner;

public class BundledNotificationDemoActivity extends Activity {

    private static final Random RANDOM = new Random();

    private static final String[] WORDS = {"lorem", "ipsum", "dolor",
            "sit", "amet", "consectetur", "adipisici", "elit"};

    private static final String TAG = BundledNotificationDemoActivity.
            class.getSimpleName();

    private static final String KEY_TEXT_REPLY = "key_text_reply";
    private static final String KEY_ID = "key_id";

    private static final int N_SUMMARY = 1;

    private NotificationManager nm;

    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        nm = (NotificationManager)
                getSystemService(NOTIFICATION_SERVICE);

        Notification.Builder summary = createBaseNotification(R.drawable.ic_launcher,
                getString(R.string.summary));
        summary.setGroup(TAG);
        summary.setGroupSummary(true);
        summary.setOngoing(true);
        nm.notify(N_SUMMARY, summary.build());

        setContentView(R.layout.main);
        CheckBox cb = (CheckBox) findViewById(R.id.grouped);
        Button b1 = (Button) findViewById(R.id.new_notification);
        b1.setOnClickListener(e -> {
            Notification.Builder b = createBaseNotification(R.drawable.ic_announcement,
                    getString(R.string.subject));
            b.setStyle(new Notification.BigTextStyle()
                    .bigText(createPhrase(80)));
            if (cb.isChecked()) {
                b.setGroup(TAG);
            }
            String reply = getString(R.string.reply);
            RemoteInput remoteInput = new RemoteInput.Builder(KEY_TEXT_REPLY)
                    .setLabel(reply)
                    .build();
            Intent i = new Intent(this, BundledNotificationDemoActivity.class);
            int id = 1 + RANDOM.nextInt(Integer.MAX_VALUE);
            i.putExtra(KEY_ID, id);
            Notification.Action action =
                    new Notification.Action.Builder(
                            Icon.createWithResource(this, R.drawable.ic_announcement),
                            reply,
                            PendingIntent.getActivity(this, id, i,
                                    PendingIntent.FLAG_UPDATE_CURRENT))
                            .addRemoteInput(remoteInput)
                            .build();
            b.addAction(action);
            nm.notify(id, b.build());
        });

        tv = (TextView) findViewById(R.id.message);

        boolean notificationsEnabled = nm.areNotificationsEnabled();
        if (!notificationsEnabled) {
            Toast.makeText(this, R.string.no_notifications,
                    Toast.LENGTH_LONG).show();
        }
        b1.setEnabled(notificationsEnabled);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Intent i = getIntent();
        if (i != null) {
            Bundle remoteInput = RemoteInput.getResultsFromIntent(i);
            if (remoteInput != null) {
                CharSequence cs = remoteInput.getCharSequence(KEY_TEXT_REPLY);
                tv.setText(cs);
                int id = i.getIntExtra(KEY_ID, -1);
                for (StatusBarNotification n : nm.getActiveNotifications()) {
                    if ((getPackageName().equals(n.getPackageName())) &&
                            (n.getId() == id)) {
                        Notification.Builder b = Notification.Builder.recoverBuilder(this, n.getNotification());
                        b.setContentTitle(cs);
                        nm.notify(id, b.build());
                        break;
                    }
                }
            }
        }
    }

    private Notification.Builder createBaseNotification(int icon, String text) {
        return new Notification.Builder(this)
                .setContentTitle(getString(R.string.title))
                .setContentText(text)
                .setSmallIcon(icon);
    }

    private static String createPhrase(int numWords) {
        StringJoiner sj = new StringJoiner(" ");
        for (int i = 0; i < numWords; i++) {
            sj.add(WORDS[RANDOM.nextInt(WORDS.length)]);
        }
        return sj.toString();
    }
}