为什么Android Studio中的调度程序不起作用

Question

我试图在每天的特定时间安排通知，但不起作用。我正在尝试使用在线教程，但仍然不起作用。我不确定问题出在哪里。我在这里附上了所有的代码。

主要活动.java

package com.example.alarm;
import androidx.appcompat.app.AppCompatActivity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
Button show;
public static String MY_PREFS_NAME= "nameOfSharedPreferences";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show = findViewById(R.id.btn_show);

show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startAlarm(true,true);
}
});
}
private void startAlarm(boolean isNotification, boolean isRepeat) {
AlarmManager manager = (AlarmManager) MainActivity.this.getSystemService(Context.ALARM_SERVICE);
Intent myIntent;
PendingIntent pendingIntent;
// SET TIME HERE
Calendar calendar= Calendar.getInstance();
//calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY,17);
calendar.set(Calendar.MINUTE, 12);

myIntent = new Intent(MainActivity.this,AlarmNotificationReceiver.class);
pendingIntent = PendingIntent.getBroadcast(this,0,myIntent,0);
myIntent.setAction("MY_NOTIFICATION_MESSAGE");
if(!isRepeat) {
//assert manager != null;
manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime()+3000,pendingIntent);
}
else {
//assert manager != null;
manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY,pendingIntent);
}
}
}

AlarmNotificationReceiver.java

package com.example.alarm;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import static android.app.PendingIntent.FLAG_ONE_SHOT;
public class AlarmNotificationReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Notification.Builder builder = new Notification.Builder(context);
Intent myIntent = new Intent(context, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, myIntent, FLAG_ONE_SHOT );
builder.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Title")
.setContentIntent(pendingIntent)
.setContentText("Description")
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND)
.setContentInfo("Info")
.build();
NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
if (intent.getAction().equals("MY_NOTIFICATION_MESSAGE")) {
notificationManager.notify(100,builder.build());
Log.i("Notify", "Alarm"); //Optional, used for debuging.
}
}
}

MyService.java

package com.example.alarm;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.os.SystemClock;
import java.util.Calendar;
public class MyService extends Service {
public MyService() {
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
startAlarm(true,true);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_NOT_STICKY;
}
private void startAlarm(boolean isNotification, boolean isRepeat) {
AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent myIntent;
PendingIntent pendingIntent;
//THIS IS WHERE YOU SET NOTIFICATION TIME FOR CASES WHEN THE NOTIFICATION NEEDS TO BE RESCHEDULED
Calendar calendar= Calendar.getInstance();
//calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY,18);
calendar.set(Calendar.MINUTE,45);
myIntent = new Intent(this,AlarmNotificationReceiver.class);
pendingIntent = PendingIntent.getBroadcast(this,0,myIntent,0);

if(!isRepeat)
manager.set(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime()+3000,pendingIntent);
else
manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY,pendingIntent);
}
}

BootReceiver.java

package com.example.alarm;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class BootReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent)
{
// Your code to execute when Boot Completd
Intent i = new Intent(context,MyService.class);
context.startService(i);
Toast.makeText(context, "Booting Completed", Toast.LENGTH_LONG).show();
}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.alarm">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.SET_ALARM"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<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:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<receiver android:name=".BootReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</receiver>
<receiver android:name=".AlarmNotificationReceiver"
android:enabled="true"/>
<service
android:name=".MyService"
android:enabled="true"
android:exported="true"
android:permission="TODO" />

<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

build.gradle(：app(

apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.example.alarm"
minSdkVersion 16
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Answer 1

您应该在发送PendingIntent之前放置myIntent.setAction(在MainActivity中(。但忘了它吧，因为启动后的广播接收器现在已经完全死了！