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。
class ActivityCollector {
//var activities :MutableList<Activity>=MutableList<Activity>()
companion object{
val activities = ArrayList<Activity>()
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
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal">
<TextView
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textSize="18sp"
android:text="account:"
/>
<EditText
android:id="@+id/account"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal">
<TextView
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textSize="18sp"
android:text="password:"
/>
<EditText
android:id="@+id/password"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:inputType="textPassword"
/>
</LinearLayout>
<Button
android:id="@+id/login"
android:layout_width="match_parent"
android:layout_height="60dp"
android:text="Login"
/>
</LinearLayout>
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。
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
</activity>
<activity android:name=".LoginActivity" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
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找一找教程网。
