项目中遇到一个需求，程序在一段时间没有操作的情况下退出登录，以此作为随笔记忆。
原理：在BaseActivity中重写dispatchTouchEvent方法，在MotionEvent.ACTION_UP事件中利用Handler发送一个延时消息，在MotionEvent.ACTION_DOWN事件中清空Handler消息队列，然后所有的Activity继承BaseActivity。
-
下面贴出BaseActivity代码：
/** * Created by 一位不愿透露自己姓氏的先生 on 2017/8/23. */ public class BaseActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); startAD(); } private Handler handler = new Handler(); private long time = 1000 * 5; @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: handler.removeCallbacks(runnable); break; case MotionEvent.ACTION_UP: startAD(); break; } return super.dispatchTouchEvent(event); } private Runnable runnable = new Runnable() { @Override public void run() { PrefUtils.setBoolean(BaseActivity.this, "isLogin", false); AlertDialog.Builder builder = new AlertDialog.Builder(BaseActivity.this); builder.setTitle("温馨提示") .setCancelable(false) .setMessage("当前登录已失效，请重新登录") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { Intent intent = new Intent(); intent.setClass(BaseActivity.this, LoginActivity.class); startActivity(intent); } }); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }; public void startAD() { handler.removeCallbacks(runnable); handler.postDelayed(runnable, time); } @Override protected void onDestroy() { super.onDestroy(); } } 如果仅仅是这样是不能满足我们的需求的，例如我从MainActivity 跳到A Actiity的时候我不会将MainActivity销毁，那么当我在A Activity中长时间没有操作跳到登录页面登录之后再重新打开MainActivity的时候就会出问题，这个时候我们需要将所有打开的Activity全部关闭
解决方法：自定义一个Application,定义一个集合用来存放所有Actiity的实例，当我们需要退出的时候调用集合依次执行finish()；
-
下面贴出Application代码：
/** * Created by 一位不愿透露自己姓氏的先生 on 2017/4/24. */ public class DemoAppLication extends Application { private static DemoAppLication mycontext; private ArrayList<Activity> list; @Override public void onCreate() { super.onCreate(); list = new ArrayList<>(); } public void AddActivity(Activity activity) { list.add(activity); } public void exit() { try { for (Activity activity : list) { if (activity != null) activity.finish(); } } catch (Exception e) { e.printStackTrace(); } } } -
然后在BaseActivity获取Application的实例并保存代码修改如下：
/** * Created by 一位不愿透露自己姓氏的先生 on 2017/8/23. */ public class BaseActivity extends AppCompatActivity { public MiaoHuAppLication application; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); application = (DemoLication) getApplication(); startAD(); } private Handler handler = new Handler(); private long time = 1000 * 5; @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: handler.removeCallbacks(runnable); break; case MotionEvent.ACTION_UP: startAD(); break; } return super.dispatchTouchEvent(event); } private Runnable runnable = new Runnable() { @Override public void run() { PrefUtils.setBoolean(BaseActivity.this, "isLogin", false); AlertDialog.Builder builder = new AlertDialog.Builder(BaseActivity.this); builder.setTitle("温馨提示") .setCancelable(false) .setMessage("当前登录已失效，请重新登录") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { Intent intent = new Intent(); intent.setClass(BaseActivity.this, LoginActivity.class); startActivity(intent); IMMessage.stop(); application.exit(); } }); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }; public void startAD() { handler.removeCallbacks(runnable); handler.postDelayed(runnable, time); } @Override protected void onDestroy() { super.onDestroy(); } } -
最后在每一个Activity中调用如下代码：
application.AddActivity(this); -
然后在需要关闭Activity的地方调用如下代码：
application.exit();
