你能解释一下为什么这个代码在Android棒棒糖上很好用,但我在Android Oreo上不好用吗?该代码设置了一个警报,5秒后开始,每4秒重复一次。它发送了一个广播,我收到了一个祝酒词。在Android8中,它开始的时间很晚,下一个广播不是每4秒发送一次,而是随机发送(很晚)。我能做什么?

import android.app.AlarmManager;

import android.app.PendingIntent;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.media.AudioManager;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

private final String LOG_TEST = "LOG_TEST";

private Button bStart, bStop;

private Intent intent;

private PendingIntent pendingIntent;

public static final String MY_CUSTOM_ACTION = "mio.broadcast";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final AlarmManager alarm = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);

intent = new Intent(MainActivity.this, MyReceiver.class);

pendingIntent = PendingIntent.getBroadcast(MainActivity.this,0,intent,0);

bStart=(Button)findViewById(R.id.bStart);

bStop= (Button)findViewById(R.id.bStop);

bStart.setOnClickListener(new View.OnClickListener(){

@Override

public void onClick(View v) {

Calendar attivazione = Calendar.getInstance();

alarm.setRepeating(AlarmManager.RTC_WAKEUP, attivazione.getTimeInMillis()+5000,4000,pendingIntent);

}

});

bStop.setOnClickListener(new View.OnClickListener(){

@Override

public void onClick(View v) {

if(alarm!=null){

alarm.cancel(pendingIntent);

}

}

});

}

}

我的接收者

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

Toast.makeText(context, "Vibrazione inserita", Toast.LENGTH_LONG).show();

}

}

显示

package="com.example.redwi.alerttry">

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">

android:name=".MyReceiver"

android:enabled="true"

android:exported="false" />

希望你能帮助我谢谢!