对广播接收器使用 IntentService 而不是 AsyncTask?
Using IntentService instead of AsyncTask for Broadcast Receiver?
我正在尝试使用 BroadcastReceiver 发送电子邮件,代码在使用 onClick 时使用 AsyncTask 正常工作,但在调用 AlarmReceiver 时不起作用。
这个方法用IntentService会不会更好?如果是这样,最好的写法是什么?
谁能帮忙解决这个问题?我对 java 还是个新手,想帮助提高我的知识。 :)
如有任何帮助,我们将不胜感激!谢谢!
AlarmReceiver.java
import android.app.Activity;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.content.BroadcastReceiver;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;
import static android.graphics.Color.GREEN;
public class AlarmReceiver extends BroadcastReceiver {
Context cxt;
Activity context;
@Override
public void onReceive(Context arg0, Intent arg1) {
cxt = arg0;
addNotification();
new SendMail().execute();
}
private class SendMail extends AsyncTask<String, Integer, Void> {
protected Void doInBackground(String... params) {
Mail m = new Mail("youremail@gmail.com", "password");
String[] toArr = {"toemail@outlook.com"};
m.setTo(toArr);
m.setFrom("fromemail@gmail.com");
m.setSubject("Achieve Alert!");
m.setBody("This is a reminder about your upcoming assignment or examination!");
try {
if(m.send()) {
Toast.makeText(context.getApplicationContext(), "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context.getApplicationContext(), "Email was not sent.", Toast.LENGTH_LONG).show();
}
} catch(Exception e) {
Log.e("MailApp", "Could not send email", e);
}
return null;
}
}
}
首先从警报管理器启动 Intent 服务:
private void setAlarm(Calendar targetCal){
/* HERE */ Intent intent = new Intent(getBaseContext(), AlarmService.class);
final int _id = (int) System.currentTimeMillis();
/* HERE */ PendingIntent pendingIntent = PendingIntent.getService(this,_id,intent,PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
......
.....
现在意向服务class:
public class AlarmService extends IntentService {
PowerManager powerManager;
PowerManager.WakeLock wakeLock;
public AlarmService() {
super("");
}
@Override
protected void onHandleIntent(Intent intent) {
powerManager = (PowerManager) getSystemService(POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "FCFCFCFC");
wakeLock.acquire();
addNotification();
sendMAIL();
}
public void addNotification() {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.icon_transperent)
.setLights(GREEN, 700, 700)
.setContentTitle("Achieve - Alert!")
.setContentText("This is a reminder for your deadline!");
Intent notificationIntent = new Intent(getApplicationContext(), MainMenu.class);
PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
// Add as notification
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
builder.setVibrate(new long[] { 0, 1000, 1000, 1000, 1000 });
manager.notify(0, builder.build());
}
public void sendMAIL(){
Mail m = new Mail("youremail@gmail.com", "password");
String[] toArr = {"toemail@outlook.com"};
m.setTo(toArr);
m.setFrom("fromemail@gmail.com");
m.setSubject("Achieve Alert!");
m.setBody("This is a reminder about your upcoming assignment or examination!");
try {
if(m.send()) {
Toast.makeText(getApplicationContext(), "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Email was not sent.", Toast.LENGTH_LONG).show();
}
} catch(Exception e) {
Log.e("MailApp", "Could not send email", e);
}
wakeLock.release();
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
现在,清单添加:
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<service android:name=".AlarmService" android:exported="true" android:enabled="true"/>
我正在尝试使用 BroadcastReceiver 发送电子邮件,代码在使用 onClick 时使用 AsyncTask 正常工作,但在调用 AlarmReceiver 时不起作用。
这个方法用IntentService会不会更好?如果是这样,最好的写法是什么?
谁能帮忙解决这个问题?我对 java 还是个新手,想帮助提高我的知识。 :)
如有任何帮助,我们将不胜感激!谢谢!
AlarmReceiver.java
import android.app.Activity;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.content.BroadcastReceiver;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;
import static android.graphics.Color.GREEN;
public class AlarmReceiver extends BroadcastReceiver {
Context cxt;
Activity context;
@Override
public void onReceive(Context arg0, Intent arg1) {
cxt = arg0;
addNotification();
new SendMail().execute();
}
private class SendMail extends AsyncTask<String, Integer, Void> {
protected Void doInBackground(String... params) {
Mail m = new Mail("youremail@gmail.com", "password");
String[] toArr = {"toemail@outlook.com"};
m.setTo(toArr);
m.setFrom("fromemail@gmail.com");
m.setSubject("Achieve Alert!");
m.setBody("This is a reminder about your upcoming assignment or examination!");
try {
if(m.send()) {
Toast.makeText(context.getApplicationContext(), "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(context.getApplicationContext(), "Email was not sent.", Toast.LENGTH_LONG).show();
}
} catch(Exception e) {
Log.e("MailApp", "Could not send email", e);
}
return null;
}
}
}
首先从警报管理器启动 Intent 服务:
private void setAlarm(Calendar targetCal){
/* HERE */ Intent intent = new Intent(getBaseContext(), AlarmService.class);
final int _id = (int) System.currentTimeMillis();
/* HERE */ PendingIntent pendingIntent = PendingIntent.getService(this,_id,intent,PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
......
.....
现在意向服务class:
public class AlarmService extends IntentService {
PowerManager powerManager;
PowerManager.WakeLock wakeLock;
public AlarmService() {
super("");
}
@Override
protected void onHandleIntent(Intent intent) {
powerManager = (PowerManager) getSystemService(POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "FCFCFCFC");
wakeLock.acquire();
addNotification();
sendMAIL();
}
public void addNotification() {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.icon_transperent)
.setLights(GREEN, 700, 700)
.setContentTitle("Achieve - Alert!")
.setContentText("This is a reminder for your deadline!");
Intent notificationIntent = new Intent(getApplicationContext(), MainMenu.class);
PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
// Add as notification
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
builder.setVibrate(new long[] { 0, 1000, 1000, 1000, 1000 });
manager.notify(0, builder.build());
}
public void sendMAIL(){
Mail m = new Mail("youremail@gmail.com", "password");
String[] toArr = {"toemail@outlook.com"};
m.setTo(toArr);
m.setFrom("fromemail@gmail.com");
m.setSubject("Achieve Alert!");
m.setBody("This is a reminder about your upcoming assignment or examination!");
try {
if(m.send()) {
Toast.makeText(getApplicationContext(), "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Email was not sent.", Toast.LENGTH_LONG).show();
}
} catch(Exception e) {
Log.e("MailApp", "Could not send email", e);
}
wakeLock.release();
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
现在,清单添加:
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<service android:name=".AlarmService" android:exported="true" android:enabled="true"/>