我遇到了问题并且整天都在搜索它，但无法正确执行
如何取消其他活动的警报（alarm_Time活动）？我认为在我用来取消的意图中我的问题 设置闹钟的同一pendingintent
这是取消闹钟的alarm_Time活动中的代码：
final Intent intent = getIntent();
int alarm_No = intent.getIntExtra("alarm_No",0);
pending_intent = PendingIntent.getBroadcast(alarm_Time.this,alarm_No, intent, PendingIntent.FLAG_UPDATE_CURRENT);
//intialize alarm_off button
Button alarm_off = (Button) findViewById(R.id.alarm_off);
// create on click listner to end alarm
//final Intent finalIntent = intent;
alarm_off.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//method that change update_txt txtbox
// set_alarm_text("Alarm off!");
//cancel the alarm
alarmManager.cancel(pending_intent);
// put extra string into my_intent
// tells the clock that you pressed the "alarm off" button
intent.putExtra("extra", "alarm off");
// stop the ringtone
sendBroadcast(intent);
}
});
我设置闹钟的活动代码（MainActivity2）：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar); ///
this.context = this ;
update_txt = (TextView) findViewById(R.id.update_txt);
info_txt = (TextView) findViewById(R.id.info_txt);
final int[] h = {21, 21};
final int[] m = {15, 16};
final int length = h.length;
final Intent[] intent = new Intent[length];
final Calendar[] cal = new Calendar[length];
final AlarmManager[] alarmManager = new AlarmManager[length];
final PendingIntent[] pending_intent = new PendingIntent[length]; ;
for(int i =0; i<length; i++) {
cal[i] = Calendar.getInstance();
cal[i].set(Calendar.HOUR_OF_DAY, h[i]);
cal[i].set(Calendar.MINUTE, m[i]);
if (cal[i].getTimeInMillis() < System.currentTimeMillis())
{ cal[i].add(Calendar.DAY_OF_MONTH, 1); }
intent[i] = new Intent(this.context, AlarmReceiver.class);
alarmManager[i] = (AlarmManager) getSystemService(ALARM_SERVICE);
}
Button alarm_on = (Button) findViewById(R.id.alarm_on);
alarm_on.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String h1_string = String.valueOf(h[0]);
String m1_string = String.valueOf(m[0]);
for(int i =0; i<length; i++) {
set_alarm_text("Alarm on!" + h1_string + ":" + m1_string);
intent[i].putExtra("extra", "alarm on");
intent[i].putExtra("Alarm_no", i);
pending_intent[i] = PendingIntent.getBroadcast(MainActivity2.this, i, intent[i], PendingIntent.FLAG_UPDATE_CURRENT );
alarmManager[i].set(AlarmManager.RTC_WAKEUP, cal[i].getTimeInMillis(), pending_intent[i]);
}
}
});
//intialize alarm_off button
Button alarm_off = (Button) findViewById(R.id.alarm_off);
// create on click listner to end alarm
alarm_off.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle extras = getIntent().getExtras();
int alarm_No = -1;
if (extras != null) {
alarm_No = extras.getInt("alarm_No2");
}
Log.v("help", String.valueOf(alarm_No));
set_alarm_text("Alarm off!");
alarmManager[0].cancel(pending_intent[0]);
intent[0].putExtra("extra", "alarm off");
sendBroadcast(intent[0]);
}
});
}
private void set_alarm_text(String output) {
update_txt.setText(output);
}
private void set_info_text(String output) {
info_txt.setText(output);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
AlarmReceiver.java
public class AlarmReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Log.e("We are in the receiver", "Yay");
//fetch extra strings from the intent >>> get_ur_string =extra // alarm on - alarm off
String get_ur_string = intent.getExtras().getString("extra");
int No = intent.getExtras().getInt("Alarm_no");
// Log.e("What is the key? ", get_ur_string);
//create an intent to the ringtone service
Intent service_intent = new Intent(context, RingtonePlayingService.class);
// pass the extra from Main Activity to Ringtone Playing Service
service_intent.putExtra("extra", get_ur_string);
service_intent.putExtra("Alarm_no", No);
//start the ringtone services
context.startService(service_intent);
}
}
RingtonePlayingService.java
public class RingtonePlayingService extends Service {
MediaPlayer media_song;
int startId;
boolean isRunning;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.i("LocalService", "Received start id " + startId +": " + intent);
// fetch the extra string values
String state = intent.getExtras().getString("extra");
int alarm_No = intent.getExtras().getInt("Alarm_no");
// Log.e("Ringtone state:extra", state);
// notification
// set up the notification service
NotificationManager notify_manager = (NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
// set up an intent that goes to the Main Activity
Intent intent_main_activity = new Intent(this.getApplicationContext(), MainActivity2.class);
intent.putExtra("extra", "alarm on");
intent.putExtra("Alarm_no2", alarm_No);
// set up a pending intent
PendingIntent pending_intent_main_activity = PendingIntent.getActivity(this, alarm_No,
intent_main_activity, 0);
// make the notification parameters
Notification notification_popup = new Notification.Builder(this)
.setContentTitle("An alarm is going off!")
.setContentText("Click me!")
.setSmallIcon(R.drawable.image)
.setContentIntent(pending_intent_main_activity)
.setAutoCancel(true)
.build();
// set up notification atart command
notify_manager.notify(0, notification_popup);
// this converts the extra strings from the intent to start IDs, values 0 or 1
assert state != null;
switch (state) {
case "alarm on":
startId = 1;
int alarm_num = intent.getExtras().getInt("No");
break;
case "alarm off":
startId = 0;
Log.e("Start ID is", state);
break;
default:
startId = 0;
break;
}
// if else statments
// if there is no music playing, and the user pressing "alarm on"
// music should start playing
if( !this.isRunning && startId == 1 ){
Log.e("there is no music","and u want start");
// create an instant of the media player
media_song = MediaPlayer.create(this, R.raw.tone);
// start the ringtone
media_song.start();
this.isRunning = true;
this.startId = 0;
}
// if there is music playing, and the user pressing "alarm off"
// music should stop playing
else if( this.isRunning && startId == 0 ){
Log.e("there is music", "and u want stop");
// stop the ringtone
media_song.stop();
media_song.reset();
this.isRunning = false;
this.startId = 0;
}
return START_NOT_STICKY;
}
@Override
public void onDestroy() {
//tell the user we stopped
Log.e("on Destroy called", "ta da");
super.onDestroy();
this.isRunning = false;
}
}
答案 0 :(得分：2)
您正尝试以Activity这种方式取消闹钟：
final Intent intent = getIntent();
int alarm_No = intent.getIntExtra("alarm_No",0);
pending_intent = PendingIntent.getBroadcast(alarm_Time.this,alarm_No, intent, PendingIntent.FLAG_UPDATE_CURRENT);
...
//cancel the alarm
alarmManager.cancel(pending_intent);
但你设置了这样的闹钟：
intent[i] = new Intent(this.context, AlarmReceiver.class);
intent[i].putExtra("Alarm_no", i);
pending_intent[i] = PendingIntent.getBroadcast(MainActivity2.this, i, intent[i], PendingIntent.FLAG_UPDATE_CURRENT );
alarmManager[i].set(AlarmManager.RTC_WAKEUP, cal[i].getTimeInMillis(), pending_intent[i]);
您使用的是错误的Intent。在Activity致电getIntent()时，它会返回用于启动Intent的{{1}}。您在Activity的通话中使用它。这不会返回正确的PendingIntent.getBroadcast()。您需要将设置闹钟时使用的PendingIntent传递给Intent。这应该是这样的：
PendingIntent.getBroadcast()另外，我注意到您将额外的警报号码传递出来：
final Intent intent = new Intent(this, AlarmReceiver.class);
int alarm_No = intent.getIntExtra("alarm_No",0);
pending_intent = PendingIntent.getBroadcast(alarm_Time.this,alarm_No, intent, PendingIntent.FLAG_UPDATE_CURRENT);
...
//cancel the alarm
alarmManager.cancel(pending_intent);
使用密钥intent[i].putExtra("Alarm_no", i);
，但您尝试使用
"Alarm_no"中获取闹钟号
alarmtime_Activity使用密钥int alarm_No = intent.getIntExtra("alarm_No",0);
。这些密钥只是"alarm_No" s，所以它们区分大小写。您是否可能没有使用完全相同的密钥？我无法分辨，因为您尚未发布用于启动String的代码。