我有一个关于android推送通知的查询，我在另一个stackoverflow帖子中询问了它，我没有从中获得太多帮助[Query regarding Android push notifications。所以我再次发布它，它如下：
我有一个Android应用程序，可以从Google推送通知服务接收推送通知。当我点击收到的通知时，它会打开一个显示此消息的UI，它是一个列表视图。现在，当用户收到推送通知并假设此屏幕已打开时，应自动刷新UI，以便显示最新通知。有谁能告诉我如何解决这个问题？
以下是我已实施的代码：
接收通知的Java代码：
import java.util.Timer;
import java.util.TimerTask;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.util.Log;
import com.example.foodu.R;
import com.google.android.gcm.GCMBaseIntentService;
public class GCMIntentService extends GCMBaseIntentService {
private static final String TAG = "GCM ::Service";
// Use your PROJECT ID from Google API into SENDER_ID
public static final String SENDER_ID = "53340195486";
public GCMIntentService() {
super(SENDER_ID);
}
@Override
protected void onError(Context arg0, String errorId) {
Log.e(TAG, "onError: errorId=" + errorId);
}
@Override
protected void onMessage(Context context, Intent data) {
String message;
// Message from PHP server
message = data.getStringExtra("message");
// Open a new activity called GCMMessageView
Intent intent = new Intent(this, com.example.foodu.Notification.class);
// Pass data to the new activity
intent.putExtra("message", message);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Starts the activity on notification click
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
// Create the notification with a notification builder
Notification notification = new Notification.Builder(this)
.setSmallIcon(R.drawable.ic_logo)
.setWhen(System.currentTimeMillis())
.setContentTitle("Deals")
.setContentText(message).setContentIntent(pIntent)
.getNotification();
// Remove the notification on click
notification.flags |= Notification.FLAG_AUTO_CANCEL;
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.notify(R.string.app_name, notification);
{
// Wake Android Device when notification received
PowerManager pm = (PowerManager) context
.getSystemService(Context.POWER_SERVICE);
final PowerManager.WakeLock mWakelock = pm.newWakeLock(
PowerManager.FULL_WAKE_LOCK
| PowerManager.ACQUIRE_CAUSES_WAKEUP, "GCM_PUSH");
mWakelock.acquire();
// Timer before putting Android Device to sleep mode.
Timer timer = new Timer();
TimerTask task = new TimerTask() {
public void run() {
mWakelock.release();
}
};
timer.schedule(task, 5000);
}
}
@Override
protected void onRegistered(Context arg0, String registrationId) {
Log.i(TAG, "onRegistered: registrationId=" + registrationId);
}
@Override
protected void onUnregistered(Context arg0, String registrationId) {
Log.i(TAG, "onUnregistered: registrationId=" + registrationId);
}
}
当用户点击通知时将启动的相应活动的代码：
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.text.SimpleDateFormat;
import java.util.LinkedList;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.TimeZone;
import com.example.foodu.R;
import com.example.foodu.R.drawable;
import com.example.foodu.R.id;
import com.example.foodu.R.layout;
import com.example.foodu.R.menu;
import com.google.android.gcm.GCMRegistrar;
import android.support.v7.app.ActionBarActivity;
import android.app.AlertDialog;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.CalendarContract;
import android.util.Log;
import android.view.ActionMode;
import android.view.ActionMode.Callback;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Notification extends ActionBarActivity {
LinkedList<NotificationData> notificationList = new LinkedList<NotificationData>();
ListView listView = null;
NotificationListAdapter adaptor;
ActionMode mActionMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notification);
overridePendingTransition(R.anim.trans_left_in, R.anim.trans_left_out);
listView = (ListView) findViewById(R.id.listView1);
// Retrive the data from GCMIntentService.java
Intent i = getIntent();
String message = i.getStringExtra("message");
//getDataForDisplay();
if(message!=null)
{
parseData(message);
}else{
getDataToDisplay();
}
adaptor = new NotificationListAdapter(getApplicationContext(), notificationList);
listView.setAdapter(adaptor);
TextView emptyText = (TextView) findViewById(R.id.empty);
emptyText.setText("No Events Yet!");
listView.setEmptyView(emptyText);
listView.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
onListitemSelect(position);
view.setSelected(true);
return true;
}
});
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
adaptor.notifyDataSetChanged();
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
}
void writeToFile(){
FileOutputStream fos;
try {
fos = openFileOutput("varun", Context.MODE_PRIVATE);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(notificationList);
oos.close();
}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
void readFromFile(){
try{
FileInputStream fis = openFileInput("varun");
ObjectInputStream ois = new ObjectInputStream(fis);
LinkedList<NotificationData> local = (LinkedList<NotificationData>) ois.readObject();
ois.close();
for (int i = 0; i < local.size(); i++) {
notificationList.add(local.get(i));
}
}catch(Exception e){
e.printStackTrace();
}
}
private void getDataToDisplay() {
// TODO Auto-generated method stub
readFromFile();
}
private void parseData(String message) {
try {
int len = 0;
String[] stringArr = new String[100];
StringTokenizer st = new StringTokenizer(message, ".");
len = st.countTokens();
for (int i = 0; i < len; i++) {
if (st.hasMoreTokens()) {
stringArr[i] = st.nextToken();
}
}
NotificationData data = new NotificationData();
data.title = stringArr[0];
data.venue = stringArr[1];
data.date = stringArr[2];
data.time = stringArr[3];
notificationList.add(data);
readFromFile();
} catch (Exception e) {
e.printStackTrace();
}
}
private void getDateToDisplay() {
// TODO Auto-generated method stub
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
writeToFile();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.notificationmenu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
if(id == R.id.action_register){
registerDevice();
return true;
}
return super.onOptionsItemSelected(item);
}
private void registerDevice() {
try {
GCMRegistrar.checkDevice(this);
GCMRegistrar.checkManifest(this);
GCMRegistrar
.register(Notification.this, GCMIntentService.SENDER_ID);
} catch (Exception e) {
e.printStackTrace();
}
}
private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.notificationcontext, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_calender:
addToCalender();
mode.finish();
return true;
case R.id.menu_delete:
//deleteData();
showAlertBox();
return false;
case R.id.menu_share:
shareDate();
mode.finish();
return true;
case R.id.menu_copy:
copyToClip();
mode.finish();
return true;
default:
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
adaptor.removeSelection();
}
};
void onListitemSelect(int position) {
adaptor.toggleSelection(position);
boolean hasCheckedItems = adaptor.getSelectedCount() > 0;
if (hasCheckedItems && mActionMode == null) {
mActionMode = startActionMode((Callback) mActionModeCallback);
} else if (!hasCheckedItems && mActionMode != null) {
mActionMode.finish();
}
if (mActionMode != null)
mActionMode.setTitle(String.valueOf(adaptor.getSelectedCount()));
}
protected void showAlertBox() {
// TODO Auto-generated method stub
AlertDialog.Builder builder1 = new AlertDialog.Builder(Notification.this);
builder1.setMessage("Delete " + adaptor.getSelectedIds().size()+ " events?");
builder1.setCancelable(true);
builder1.setIcon(R.drawable.alert);
builder1.setTitle("Caution");
builder1.setIcon(android.R.drawable.ic_dialog_alert);
builder1.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
deleteData();
mActionMode.finish();
}
});
builder1.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert11 = builder1.create();
alert11.show();
}
protected void copyToClip() {
StringBuilder shareText = new StringBuilder();
for (int i = 0; i < adaptor.getSelectedIds().size(); i++) {
NotificationData data = notificationList
.get(adaptor.getSelectedIds().keyAt(i));
shareText.append(data.title + " " + data.venue + " " + data.date
+ " " + data.time);
shareText.append("\n");
}
ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("Notification App", shareText);
clipboard.setPrimaryClip(clip);
Toast.makeText(getApplicationContext(), "Data copied to ClipBoard",
Toast.LENGTH_LONG).show();
}
protected void shareDate() {
StringBuilder shareText = new StringBuilder();
for (int i = 0; i < adaptor.getSelectedIds().size(); i++) {
NotificationData data = notificationList
.get(adaptor.getSelectedIds().keyAt(i));
shareText.append(data.title + " " + data.venue + " " + data.date
+ " " + data.time);
shareText.append("\n");
}
String share = shareText.toString();
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, share);
sendIntent.setType("text/plain");
startActivity(sendIntent);
}
protected void deleteData() {
int count = 0;
int startPoint = adaptor.getSelectedIds().keyAt(0);
for (int i = 0; i < adaptor.getSelectedIds().size(); i++) {
adaptor.remove(notificationList.get(startPoint));
count++;
}
String message = " Event";
if(count>1)
{
message = " Events";
}
Toast.makeText(getApplicationContext(),
count + message+" deleted", Toast.LENGTH_LONG)
.show();
}
private void addToCalender() {
try {
int count = 0;
for (int i = 0; i < adaptor.getSelectedIds().size(); i++) {
NotificationData data = notificationList
.get(adaptor.getSelectedIds().keyAt(i));
ContentResolver cr = getApplicationContext()
.getContentResolver();
ContentValues values = new ContentValues();
String myDate = data.date + " " + data.time;
String timeArr[] = data.time.split("to");
SimpleDateFormat sfd = new SimpleDateFormat(
"' Date: 'MM/dd/yyyy 'Time: 'hh a", Locale.getDefault());
long time = sfd.parse(myDate).getTime();
values.put(CalendarContract.Events.DTSTART, time);
if (timeArr.length > 0) {
String endTime = timeArr[1];
SimpleDateFormat timeFormat = new SimpleDateFormat(
"' Date: 'MM/dd/yyyy hh a", Locale.getDefault());
long endtime = timeFormat.parse(data.date + " " + endTime)
.getTime();
values.put(CalendarContract.Events.DTEND, endtime);
}
values.put(CalendarContract.Events.TITLE, data.title);
values.put(CalendarContract.Events.DESCRIPTION, data.venue);
TimeZone timeZone = TimeZone.getDefault();
values.put(CalendarContract.Events.EVENT_TIMEZONE,
timeZone.getID());
values.put(CalendarContract.Events.CALENDAR_ID, 1);
Uri uri = cr
.insert(CalendarContract.Events.CONTENT_URI, values);
count++;
}
String message = " Event";
if(count>1)
{
message = " Events";
}
Toast.makeText(getApplicationContext(),
count + message + " added to Calender", Toast.LENGTH_LONG)
.show();
} catch (Exception e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：3)
检查以下代码/步骤
1）添加您的活动（UI刷新活动）
private BroadcastReceiver mMyBroadcastReceiver;
然后，
2）在onResume
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mMyBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent)
{
// Here you can refresh your listview or other UI
Toast.makeText(getApplicationContext(), "Receiver", 2000).show();
}
};
try {
LocalBroadcastManager.getInstance(this).registerReceiver(mMyBroadcastReceiver,new IntentFilter("your_action"));
} catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}}
//和您的其他代码
3）然后在onPause中取消注册
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
LocalBroadcastManager.getInstance(this).unregisterReceiver(mMyBroadcastReceiver);
}
4）最后添加你的GCM reciver类。 首先使用静态变量检查您的活动是否可见
if visible add
Intent gcm_rec = new Intent("your_action"); LocalBroadcastManager.getInstance(arg0).sendBroadcast(gcm_rec);
else
use Notification Manager for notification.
我认为这是刷新listview UI /调用Fetching方法的简单方法。