Android - 005 - Activities Lifecycle / Intents

android.005.java

public class MainActivity extends AppCompatActivity {

    private final String KLASSE = "MainActivity";

    private Button btnZweiteActivity;

    @Override
    protected void onStart() {
        super.onStart();
        Log.v("XXXXX " + KLASSE, "onStart");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.v("XXXXX " + KLASSE, "onStop");

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.v("XXXXX " + KLASSE, "onDestroy");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.v("XXXXX " + KLASSE, "onPause");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.v("XXXXX " + KLASSE, "onResume");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.v("XXXXX " + KLASSE, "onRestart");
    }

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

        init();
        Log.v("XXXXX " + KLASSE, "onCreate");
    }

    private void init() {
        btnZweiteActivity = findViewById(R.id.btnZweiteActivity);
        btnZweiteActivity.setOnClickListener(new myOCL());

    }

    private class myOCL implements View.OnClickListener {
        @Override
        public void onClick(View view) {
            if( view == btnZweiteActivity) {
                ZweiteActivityAufrufen();
            }

        }
    }

    private void ZweiteActivityAufrufen() {
        // Absicht erzeugen, eine zweite Activity aufzurufen
        Intent intent = new Intent(this, ZweiteActivity.class);

        // Absicht in die Tat umsetzen
        startActivity(intent);
    }
}