Android Activity的生命週期與載入模式超詳細圖文解析

public class FirstActivity extends Activity {
    final String TAG = "-----FirstActivity-----";
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first);
        // 輸出紀錄檔
        Log.d(TAG, "-----onCreate-----");
        TextView textView = findViewById(R.id.text1);
        Button button1 = findViewById(R.id.bn_first1);
        Button button2 = findViewById(R.id.bn_first2);
        // 第一個按鈕跳轉到第二個Activity
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
                startActivity(intent);
            }
        });
        // 第二個按鈕銷燬該Activity
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FirstActivity.this.finish();
            }
        });
    }
    @Override
    protected void onStart() {
        super.onStart();
        Log.d(TAG, "-----onStart-----");
    }
    @Override
    protected void onRestart() {
        super.onRestart();
        Log.d(TAG, "-----onRestart-----");
    }
    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG, "-----onResume-----");
    }
    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG, "-----onPause-----");
    }
    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG, "-----onStop-----");
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.v(TAG, "-----onDestory-----");
    }
}

public class SecondActivity extends Activity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        Button button = findViewById(R.id.bn_second);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SecondActivity.this.finish();
            }
        });
    }
}