重写onCreate()方法，添加下面代码，打印当前Activity名称：
@OverridePRotected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d("BaseActivity", getClass().getSimpleName());}增加ActivityCollector，管理Activity，代码如下：
public class ActivityCollector { public static List<Activity> activities = new ArrayList<>(); public static void addActivity(Activity activity) { activities.add(activity); } public static void removeActivity(Activity activity) { activities.remove(activity); } public static void finishAll() { for (Activity activity : activities) { if (!activity.isFinishing()) { activity.finish(); } } }}修改BaseActivity类，代码如下：
public class BaseActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d("BaseActivity", getClass().getSimpleName()); ActivityCollector.addActivity(this); } @Override protected void onDestroy() { super.onDestroy(); ActivityCollector.removeActivity(this); }}其他Activity继承BaseActivity。2.继承BaseActivity，添加actionStart()方法
public class SecondActivity extends BaseActivity { public static void actionStart(Context context, String data1, String data2) { Intent intent = new Intent(context, SecondActivity.class); intent.putExtra("param1", data1); intent.putExtra("param2", data2); context.startActivity(intent); }}这样写的好处，启动SecondActivity时，知道需要传递哪些参数，启动代码如下：
SecondActivity.actionStart(FirstActivity.this, "data1", "data2");
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