使用 AlarmManager 安排任务
Scheduling a task using AlarmManager
我正在尝试安排任务“toast message”在用户选择的时间出现,但在那之后没有任何显示,我看不出代码中有什么问题。
这是我的代码
public class TimePickerFragment extends DialogFragment implements
TimePickerDialog.OnTimeSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
//set The Calendar to to the wanted time!
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.AM_PM, Calendar.AM);
Intent setMsg = new Intent(MainActivity.this, TaskReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, setMsg, 0);
AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
manager.setExact(AlarmManager.ELAPSED_REALTIME, calendar.getTimeInMillis(), pendingIntent);
}
}
public class TaskReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "it is working!", Toast.LENGTH_SHORT).show();
}
}
如果有更好的方法来安排这样的任务,请继续介绍。
在您的代码中使用此方法代替 manager.setExact
方法,如下所示:
manager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(), interval, pendingIntent);
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
import com.yourcomp.yourapp.R;
import java.lang.ref.WeakReference;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
public class TestAct extends Activity {
private static class MyHandler extends Handler{
private WeakReference<Activity> activityWr;
public MyHandler(Activity activityMain){
activityWr = new WeakReference<>(activityMain);
}
@Override
public void handleMessage(Message inputMessage) {
if (activityWr.get() != null){
Toast.makeText(activityWr.get(),"Your text",Toast.LENGTH_LONG).show();
}
}
}
private MyHandler mHandler;
private Future<?> mToastTaskRef;
private static int NUMBER_OF_CORES =
Runtime.getRuntime().availableProcessors();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new MyHandler(this);
/**
* initialize UI & take input from user && call method
*/
}
private void showToastAfterUserSpecifiedDelay(int seconds){
mToastTaskRef = Executors.newScheduledThreadPool(NUMBER_OF_CORES).scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
mHandler.sendMessage(new Message());
}
}, /**initial delay*/60
,/**time*/seconds
,/**time unit*/ TimeUnit.MILLISECONDS);
}
private void stopToastTask(){
if (mToastTaskRef != null && !mToastTaskRef.isCancelled() && !mToastTaskRef.isDone()){
mToastTaskRef.cancel(true); //tru -- >interrupt even if it's running
}
}
}
我正在尝试安排任务“toast message”在用户选择的时间出现,但在那之后没有任何显示,我看不出代码中有什么问题。 这是我的代码
public class TimePickerFragment extends DialogFragment implements
TimePickerDialog.OnTimeSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
//set The Calendar to to the wanted time!
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.AM_PM, Calendar.AM);
Intent setMsg = new Intent(MainActivity.this, TaskReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, setMsg, 0);
AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
manager.setExact(AlarmManager.ELAPSED_REALTIME, calendar.getTimeInMillis(), pendingIntent);
}
}
public class TaskReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "it is working!", Toast.LENGTH_SHORT).show();
}
}
如果有更好的方法来安排这样的任务,请继续介绍。
在您的代码中使用此方法代替 manager.setExact
方法,如下所示:
manager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(), interval, pendingIntent);
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
import com.yourcomp.yourapp.R;
import java.lang.ref.WeakReference;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
public class TestAct extends Activity {
private static class MyHandler extends Handler{
private WeakReference<Activity> activityWr;
public MyHandler(Activity activityMain){
activityWr = new WeakReference<>(activityMain);
}
@Override
public void handleMessage(Message inputMessage) {
if (activityWr.get() != null){
Toast.makeText(activityWr.get(),"Your text",Toast.LENGTH_LONG).show();
}
}
}
private MyHandler mHandler;
private Future<?> mToastTaskRef;
private static int NUMBER_OF_CORES =
Runtime.getRuntime().availableProcessors();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new MyHandler(this);
/**
* initialize UI & take input from user && call method
*/
}
private void showToastAfterUserSpecifiedDelay(int seconds){
mToastTaskRef = Executors.newScheduledThreadPool(NUMBER_OF_CORES).scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
mHandler.sendMessage(new Message());
}
}, /**initial delay*/60
,/**time*/seconds
,/**time unit*/ TimeUnit.MILLISECONDS);
}
private void stopToastTask(){
if (mToastTaskRef != null && !mToastTaskRef.isCancelled() && !mToastTaskRef.isDone()){
mToastTaskRef.cancel(true); //tru -- >interrupt even if it's running
}
}
}