Question

我正在尝试在将来的预定时间生成警报。以下是代码

MainActivity.java

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import java.util.GregorianCalendar;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void scheduleAlarm(View V)
    {
        // time at which alarm will be scheduled here alarm is scheduled at 1 day from current time,
        // we fetch  the current time in milliseconds and added 1 day time
        // i.e. 24*60*60*1000= 86,400,000   milliseconds in a day
        Long time = new GregorianCalendar().getTimeInMillis()+60*60*1000;

        // create an Intent and set the class which will execute when Alarm triggers, here we have
        // given AlarmReciever in the Intent, the onRecieve() method of this class will execute when
        // alarm triggers and
        //we will write the code to send SMS inside onRecieve() method pf Alarmreciever class
        Intent intentAlarm = new Intent(this, AlarmReciever.class);

        // create the object
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        //set the alarm for particular time
        alarmManager.set(AlarmManager.RTC_WAKEUP,time, PendingIntent.getBroadcast(this,1,  intentAlarm, PendingIntent.FLAG_UPDATE_CURRENT));
        Toast.makeText(this, "Alarm Scheduled for Tommrrow", Toast.LENGTH_LONG).show();

    }
}

AlarmReceiever.java

public class AlarmReciever extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        // TODO Auto-generated method stub


        // here you can start an activity or service depending on your need
        // for ex you can start an activity to vibrate phone or to ring the phone

       String message="Hi I will be there later, See You soon";// message to send

        // Show the toast  like in above screen shot
        Log.d("Alarm",message);
        Toast.makeText(context, "Alarm Triggered and SMS Sent", Toast.LENGTH_LONG).show();
    }

}

content_main.xml

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:gravity="center_vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView
        android:id="@+id/textView1"
        android:gravity="center_horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Alarm Manager Example"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/button1"
        android:layout_marginTop="25dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Schedule The Alarm"
        android:onClick="scheduleAlarm"/>

</LinearLayout>

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="voice1.xxx.com.alarmcheck2" >

    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".AlarmReciever"/>
    </application>

</manifest>

我试图在一分钟后发出警报，但遗憾的是没有发生任何事情。我在这做错了什么？另外，即使手机重启/关闭然后再打开，我怎样才能确保我的日程安排能够正常工作？

Answer 1

我认为你没有在上面的代码中调用scheduleAlarm（）方法。即使在手机重启/关闭后进行计划工作，您也必须听 BOOT_COMPLETED 事件。对于listen bootcompile，代码如下： -

您需要在清单中使用操作名称 android.intent.action.BOOT_COMPLETED 定义接收器。

<receiver android:name=".BootCompletedReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"/>
    </intent-filter>
</receiver>

确保还包括已完成的启动权限。

广播接收器 -

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class BootCompletedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

    }
}

Answer 2

我尝试了你的代码并进行了一些调整，这对我有用

public void scheduleAlarm() {
        final AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        final PendingIntent wakeupIntent = PendingIntent.getBroadcast(this, 0,
                new Intent(this, AlarmReciever.class), PendingIntent.FLAG_UPDATE_CURRENT);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.SECOND, 60); // first time
        long frequency = 6* 1000; // in ms
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), frequency, wakeupIntent);

    }

试试这个。

Android：AlarmManager没有被解雇

2 个答案: