统一管理活动

1.BaseActivity

　　如何知道当前在哪个活动？

　　让所有活动继承BaseActivity。

public class BaseActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //获取实例名
        Log.d("baseActivity", getClass().getSimpleName());
        //将当前实例添加
        ActivityController.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ActivityController.removeActivity(this);
    }
}

2.活动管理器 ActivityController

　　

public class ActivityController {
    public static List<Activity> activities = new ArrayList<>();

    /**
     * 添加活动
     *
     * @param activity
     */
    public static void addActivity(Activity activity) {
        activities.add(activity);
    }

    /**
     * 删除活动
     *
     * @param activity
     */
    public static void removeActivity(Activity activity) {
        activities.remove(activity);
    }

    /**
     * 结束应用
     */
    public static void finishAll() {
        for (Activity activity :
                activities) {
            if (!activity.isFinishing()) {
                activity.finish();
            }
        }
    }
}