android - AlarmManager executes my PendingIntent immediately instead of waiting for sertain time -


i trying implement alarm, , therefore app has 2 activities: main 1 (where user sets alarm) , 'ringing' 1 displayed when alarm triggered. here how send intent alarmmanager call 'ringing' window:

public void schedulealarm(view view) {     intent intent = new intent(this, wakeup.class);     intent.setaction(intent.action_view);     intent.setflags(intent.flag_activity_reorder_to_front);     pendingintent wakeup = pendingintent.getactivity(this, 123, intent, 0);     alarmmanager alarmmanager = (alarmmanager) this.getsystemservice(this.alarm_service);     alarmmanager.setexact(alarmmanager.rtc_wakeup, calculatemillis(), wakeup); // setexact pretty made setting alarms anyway }  private long calculatemillis() {     calendar cal = calendar.getinstance();     cal.set(calendar.hour, hour);     cal.set(calendar.minute, minute);     cal.set(calendar.second, 0);     return cal.gettimeinmillis() - calendar.getinstance().gettimeinmillis(); }

in manifest have following: 

    <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name=".wakeupwithmath"         android:label="@string/app_name" >         <intent-filter>             <action android:name="android.intent.action.main" />             <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity>     <activity         android:name=".wakeup"         android:configchanges="orientation|keyboardhidden|screensize"         android:label="@string/title_activity_wake_up"         android:theme="@style/fullscreentheme" >         <intent-filter>             <action android:name="android.intent.action.view" />         </intent-filter>      </activity> </application>

i have tested multiple times , different values calculatemillis (even mocked return 30000) yet result same: right after calling alarmmanager.setexactit displayes 'ringing' activity , not wait time pass @ first.

what have missed? manifest configured wrong? need use <receiver> tag? if so, how should configure it?

setexact uses absolute time, not relative time. use time returned cal.gettimeinmillis() without subtracting current time.


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