kotlin实现强制下线功能
强制下线是需要关闭所有的活动,先创建一个类来管理所有的活动。
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class ActivityCollector { //var activities :MutableList=MutableList () companion object{ val activities = ArrayList () fun addActivity( activity:Activity){ activities.add(activity) } fun removeActivity(activity:Activity){ activities.remove(activity) } fun finsishAll(){ for(activity:Activity in activities){ if(!activity.isFinishing){ activity.finish() } } activities.clear() } } }
然后建立一个所有活动的父类
open class BaseActivity : AppCompatActivity(){ var activityCollector=ActivityCollector() lateinit var receiver:ForceOfflineReceiver override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) { super.onCreate(savedInstanceState, persistentState) ActivityCollector.addActivity(this) //activityCollector.addActivity(this) } override fun onResume() { super.onResume() var inetnefilter:IntentFilter=IntentFilter() inetnefilter.addAction("FORCE_FOOLINE") receiver=ForceOfflineReceiver() registerReceiver(receiver,inetnefilter) } override fun onPause() { super.onPause() if(receiver!=null){ unregisterReceiver(receiver) // receiver=null } } override fun onDestroy() { super.onDestroy() ActivityCollector.removeActivity(this) } open class ForceOfflineReceiver : BroadcastReceiver(){ override fun onReceive(context: Context, intent: Intent?) { var builder :AlertDialog.Builder=AlertDialog.Builder(context) builder.setTitle("Warning") builder.setMessage("you are forced to be offline .please try to login again") builder.setCancelable(false) builder.setPositiveButton("ok",object :DialogInterface.OnClickListener{ override fun onClick(dialog: DialogInterface?, which: Int) { ActivityCollector.finsishAll() var intent=Intent(context,LoginActivity::class.java) context.startActivity(intent) } }) builder.show() } } }
建立一个登录的布局文件
然后编写一个登录的活动,这里写了一个简单的登录,密码正确的话就进入主页面,否则给出提示。
class LoginActivity:BaseActivity(){ lateinit var accountEdid:EditText lateinit var passwordEdit :EditText lateinit var login:Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.login) accountEdid=findViewById(R.id.account) passwordEdit=findViewById(R.id.password) login=findViewById(R.id.login) login.setOnClickListener(View.OnClickListener { var account =accountEdid.text.toString() var password=passwordEdit.text.toString() if(account.equals("admin")&&password.equals("123")){ var intent:Intent=Intent(this, MainActivity::class.java) startActivity(intent) finish() }else{ Toast.makeText(this,"账号或密码错误",Toast.LENGTH_SHORT).show() } }) } }
然后修改一下mainactivity的代码
class MainActivity : BaseActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) var forceOffline :Button =findViewById(R.id.force_offline) forceOffline.setOnClickListener(View.OnClickListener { var intent:Intent=Intent("FORCE_FOOLINE") sendBroadcast(intent) }) } }
最后对AndroidManifest.xml修改,把主活动设置更换一下。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。
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