我是Android的新手，我正在开发基于位置的提醒的第一个应用程序。我正在添加地点，日期和时间的任务，当我到达时，我应该得到通知。我正在为任务正确地收到警报。问题是当为任务生成警报时，单击通知时应在活动中显示警报。我没有得到警报任务的值..
从下面的代码我将任务值传递给Alertview活动。
代码
private void processTasks() {
List<Task> tasks = loadFiles();
if(tasks == null || tasks.size() < 1){
// Toast.makeText(getApplicationContext(),"No Tasks Found",Toast.LENGTH_LONG).show();
}
// Toast.makeText(getApplication(),"Number of Tasks " + tasks.size(),Toast.LENGTH_LONG).show();
for (Task task : tasks) {
if (tasks != null && task.alert) {
Log.i("Task is ",task.toString());
//Toast.makeText(getApplicationContext(),"Your Task is " + task.toString(),Toast.LENGTH_LONG).show();
// if in time range
boolean timeRange = false;
// if in loc range
boolean locRange = false;
float dst = 0.0f;
if(lat > 0.0 && lon > 0.0)
{
float[] results = new float[1];
Location.distanceBetween(lat, lon, task.getTaskLat(), task.getTaskLon(), results);
float distanceInMeters = results[0];
dst = distanceInMeters;
Log.i("dist",""+distanceInMeters);
boolean isWithin5km = distanceInMeters < 5000;
locRange = isWithin5km;
}
Log.i("bool",""+locRange);
// Toast.makeText(this,"dist is " + dst ,Toast.LENGTH_LONG).show();
if(dst < 5000){
// Toast.makeText(getApplicationContext(),"Booooom",Toast.LENGTH_LONG).show();
locRange = true;
}
else {
locRange = false;
// Toast.makeText(getApplicationContext(),"Faaalse",Toast.LENGTH_LONG).show();
}
// Toast.makeText(getApplicationContext(),"Date is " + task.getDateString(),Toast.LENGTH_LONG).show();
// format date
String datearr[] = task.getDateString().split("/");
int day = Integer.parseInt(datearr[0]);
int month = Integer.parseInt(datearr[1]);
month--;
int year = Integer.parseInt(datearr[2].trim());
// Toast.makeText(getApplicationContext(),"Date is " + datearr,Toast.LENGTH_LONG).show();
// Toast.makeText(getApplicationContext(),"Time is " + task.getTimeString(),Toast.LENGTH_LONG).show();
//format time
String timearr[] = task.getTimeString().split(":");
if (timearr!=null)
{
Log.i("=>",timearr.toString());
//Toast.makeText(getApplicationContext(),"Time is " + timearr.toString(),Toast.LENGTH_LONG).show();
}
else {
Log.e("tme null","time null");
// Toast.makeText(getApplicationContext(),"Time is Null",Toast.LENGTH_LONG).show();
}
int hour = Integer.parseInt(timearr[0]);
int minute = Integer.parseInt(timearr[1]);
// month range 0-11
Calendar event = Calendar.getInstance();
event.set(year, month, day, hour, minute);
Calendar now = Calendar.getInstance();
Log.i("event", "" + event.toString());
Log.i("now", "" + now.toString());
int hourNow = now.get(Calendar.HOUR_OF_DAY);
int dNow = now.get(Calendar.DAY_OF_MONTH);
int mNow = now.get(Calendar.MONTH);
int yNow = now.get(Calendar.YEAR);
int minNow = now.get(Calendar.MINUTE);
Log.i("year", "" + yNow + " y " + year);
Log.i("mnth", "" + mNow + " m " + month);
Log.i("day", "" + dNow + " d " + day);
Log.i("minute","" + minNow + "min" + minute);
if (yNow == year && mNow == month && dNow == day) {
if (hourNow == hour && minNow == minute) {
timeRange = true;
} else {
Log.i("hour", "" + (hour - hourNow));
}
}
// Toast.makeText(getApplicationContext(),"Values are :- " + day + " , " + month + " , " + year + " , " + hour + " , " + minute,Toast.LENGTH_LONG).show();
// timeRange = true;
// Toast.makeText(getApplication(),"Time Range is " + timeRange,Toast.LENGTH_LONG).show();
// Toast.makeText(getApplicationContext(),"Loc Range is " + locRange,Toast.LENGTH_LONG).show();
if (timeRange && locRange) {
Toast.makeText(getApplicationContext(),"Your Task is " + task.toString(),Toast.LENGTH_LONG).show();
Gson gson = new Gson();
String JSON = gson.toJson(task);
Intent intent = new Intent(this, Alertview.class);
intent.putExtra("extra", JSON);
PendingIntent pIntent = PendingIntent.getActivity(this, 0,
intent, 0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(
getApplicationContext());
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentTitle("Alert !!!!");
builder.setContentText("You are near your Point of Interest !!");
builder.setContentIntent(pIntent);
builder.setAutoCancel(true);
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(99, builder.build());
task.alert = false;
persistTask(task);
}
}
}
}
Alertview活动： -
public class Alertview extends Activity {
Task task;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alert_view);
Bundle extras = getIntent().getExtras();
String JSON = extras.getString("extra");
Gson gson = new Gson();
task = gson.fromJson(JSON, Task.class);
TextView textView = (TextView)findViewById(R.id.textView5);
textView.setText(task.toString());
//Toast.makeText(getApplicationContext(),"Your Task is " + task.toString(),Toast.LENGTH_LONG).show();
}
}
为警报添加的任务是： - 任务名称： - Matunga Loc：-Matunga Labourcamp 日期： - 2015年5月22日 时间： - 22:16
当警报被解雇时，我得到以下值： - 任务名称： - Matunga Loc：-SIES学院，Sion 日期： - 2015年5月22日 时间： - 11:11
第二次添加提醒时： - 任务名称： - Sion Loc：-Transist camp 日期： - 2015年5月22日 时间： - 22:19
使用以下值触发警报： - 任务名称： - Matunga Loc：-SIES学院，Sion 日期： - 2015年5月22日 时间： - 11:11
M在传递意图之前添加的Toast中获取正确的值。
if (timeRange && locRange) {
Toast.makeText(getApplicationContext(),"Your Task is " + task.toString(),Toast.LENGTH_LONG).show();
答案 0 :(得分：2)
由于您的PendingIntent已经存在，因此您的意图数据不会更新。要更新它，您需要PendingIntent标记为PendingIntent.FLAG_UPDATE_CURRENT。
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
根据PendingIntent doc。
public static final int FLAG_UPDATE_CURRENT表示如果描述的PendingIntent已存在的标志， 然后保留它，但用这个新的东西替换它的额外数据 意图。
答案 1 :(得分：0)
使用PendingIntent.FLAG_UPDATE_CURRENT仅是解决方案的一部分。提供唯一的requestCode也很重要：
final PendingIntent pendingIntent = PendingIntent.getActivity(getContext(), (int) System.currentTimeMillis(), intent, PendingIntent.FLAG_UPDATE_CURRENT);