Praktika/MainActivity.java

package com.example.lifecyclelogger;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

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

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;

public class MainActivity extends AppCompatActivity {

    private TextView lifecycleTextView;
    private List<String> lifecycleEvents;
    private SimpleDateFormat sdf;
    private static final String PREF_NAME = "LifecycleLoggerPrefs";
    private static final String KEY_LIFECYCLE_EVENTS = "lifecycle_events";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lifecycleTextView = findViewById(R.id.lifecycleTextView);
        sdf = new SimpleDateFormat("HH:mm:ss.SSS", Locale.getDefault());

        // Initialize lifecycle events list
        lifecycleEvents = new ArrayList<>();

        // Load saved lifecycle events
        loadLifecycleEvents();
        updateLifecycleTextView();

        logAndDisplayLifecycleEvent("onCreate");
    }

    @Override
    protected void onStart() {
        super.onStart();
        logAndDisplayLifecycleEvent("onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        logAndDisplayLifecycleEvent("onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        logAndDisplayLifecycleEvent("onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        logAndDisplayLifecycleEvent("onStop");

        // Save lifecycle events when the activity is stopped
        saveLifecycleEvents();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        logAndDisplayLifecycleEvent("onDestroy");
    }

    private void logAndDisplayLifecycleEvent(String event) {
        String timestamp = sdf.format(new Date());
        String logEntry = timestamp + " - " + event;
        lifecycleEvents.add(logEntry);
        updateLifecycleTextView();
    }

    private void updateLifecycleTextView() {
        StringBuilder sb = new StringBuilder();
        for (String e : lifecycleEvents) {
            sb.append(e).append("\n");
        }
        lifecycleTextView.setText(sb.toString());
    }

    private void saveLifecycleEvents() {
        SharedPreferences prefs = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        Set<String> eventSet = new HashSet<>(lifecycleEvents); // Convert list to set to avoid duplicates
        editor.putStringSet(KEY_LIFECYCLE_EVENTS, eventSet);
        editor.apply();
    }

    private void loadLifecycleEvents() {
        SharedPreferences prefs = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
        Set<String> eventSet = prefs.getStringSet(KEY_LIFECYCLE_EVENTS, new HashSet<>());
        lifecycleEvents = new ArrayList<>(eventSet); // Convert set back to list
    }

    public void onClearHistoryClicked(View view) {
        // Clear saved events in SharedPreferences
        SharedPreferences prefs = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        editor.remove(KEY_LIFECYCLE_EVENTS);
        editor.apply();

        // Clear lifecycle events list
        lifecycleEvents.clear();
        updateLifecycleTextView();

        // Add button click event to lifecycle events
        logAndDisplayLifecycleEvent("Clear History button clicked");

        // Save the new log entry
        saveLifecycleEvents();
    }
}