public class BaseActivity extends AppCompatActivity {

    private ForceOfflineReceiver receiver;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onResume() {
        //在这里注册广播是保证只有处于栈顶的活动才能收到强制下线的广播
        super.onResume();
        IntentFilter intentFilter= new IntentFilter();
        intentFilter.addAction("lyp.com.broadcastbestpracticce.FORCE_OFFLINE");
        receiver = new ForceOfflineReceiver();
        registerReceiver(receiver,intentFilter);//注册广播
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(receiver!=null){
            unregisterReceiver(receiver);
            receiver=null;
        }
    }

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

    class ForceOfflineReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(final Context context, Intent intent) {
            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setTitle("警告");
            builder.setMessage("你已经被强制下线，请重新尝试登陆。");
            builder.setCancelable(false);
            builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    ActivityCollector.finishAll();//销毁所有活动
                    Intent intent1=new Intent(context,LoginActivity.class);
                    context.startActivity(intent1);//重新启动LoginActivity
                }
            });
            builder.show();
        }
    }
}