2019-pracownia-programowania-projekt/Lookify/app/src/main/java/com/example/lookifyv2/MainActivity.java

package com.example.lookifyv2;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    Button button_scan;
    Button button_help;
    Button button_about;

    Button button_results;

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

        button_scan = findViewById(R.id.scan_start_button);
        button_help = findViewById(R.id.help_start_button);
        button_about = findViewById(R.id.about_start_button);

        button_results = findViewById(R.id.results_start_button);

        button_scan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openScan();
            }
        });
        button_help.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openHelp();
            }
        });
        button_about.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openAbout();
            }
        });

        button_results.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openResults();
            }
        });

        //Dezaktywacja przycisku skanowania, jeśli nie ma dostępu do kamery; żądanie dostępu do kamery i zapisu
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            button_scan.setEnabled(false);
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
        }
    }

    //Aktywacja przycisku skanowania, jeśli uprawnienia zostały przyznane
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == 0) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                button_scan.setEnabled(true);
            }
        }
    }

    public void openHelp(){
        Intent intent_Help = new Intent(this, Help.class);
        startActivity(intent_Help);
    }

    public void openAbout(){
        Intent intent_About = new Intent(this, About.class);
        startActivity(intent_About);
    }

    public void openScan(){
        Intent intent_Scan = new Intent(this, TakePhoto.class);
        startActivity(intent_Scan);
    }

    public void openResults(){
        Intent intent_Results = new Intent(this, Results.class);
        startActivity(intent_Results);
    }


}