应用程序关闭时如何显示通知？
[英]How i can Show notifications when app is close?
问题描述
我有一个视频通话应用程序（它称为 FtoF，目前在 Play 商店中）。 我想在一个用户呼叫另一个用户时显示通知，我这样做了（第 110-132 和 255 行），问题是这仅在应用程序打开时才有效。 即使应用程序关闭，我如何才能使通知正常工作？ 我给你留下代码：
调用Activity.java
public class CallingActivity extends AppCompatActivity {
private TextView nameContact;
private ImageView profileImage;
private ImageView cancelCallBtn, acceptCallBtn; //private ImageView cancelCallBtn, acceptCallBtn;
private String callingId="", ringingId="";
private String reciverUserId="", receiverUserImage="", receiverUserName="";
private String senderUserId="", senderUserImage="", senderUserName="", checker="";
private DatabaseReference userRef;
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calling);
senderUserId = FirebaseAuth.getInstance().getCurrentUser().getUid();
reciverUserId = getIntent().getExtras().get("visit_user_id").toString();
userRef = FirebaseDatabase.getInstance().getReference().child("Users");
nameContact = findViewById(R.id.name_calling);
profileImage = findViewById(R.id.profile_image_calling);
cancelCallBtn = findViewById(R.id.cancel_call);
acceptCallBtn = findViewById(R.id.make_call);
cancelCallBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checker = "clicked";
cancelCallingUser();
}
});
acceptCallBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final HashMap<String, Object> callingPickUpMap = new HashMap<>();
callingPickUpMap.put("picked", "picked");
userRef.child(senderUserId).child("Ringing")
.updateChildren(callingPickUpMap)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
Intent intent = new Intent(CallingActivity.this, VideoCallActivity.class);
startActivity(intent);
}
});
}
});
getAndSetUserProfileInfo();
}
private void addNotification() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
NotificationChannel channel =
new NotificationChannel("MyNotifications", "MyNotifications", NotificationManager.IMPORTANCE_DEFAULT);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel);
}
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "MyNotifications")
.setContentTitle("Chiamata in arrivo da "+ receiverUserName)
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(true)
.setContentText("Apri FtoF per partecipare alla videochiamata");
NotificationManagerCompat manager = NotificationManagerCompat.from(this);
manager.notify(999, builder.build());
}
private void getAndSetUserProfileInfo() {
userRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.child(reciverUserId).exists()){
receiverUserImage = dataSnapshot.child(reciverUserId).child("image").getValue().toString();
receiverUserName = dataSnapshot.child(reciverUserId).child("name").getValue().toString();
nameContact.setText(receiverUserName);
Picasso.get().load(receiverUserImage).placeholder(R.drawable.profile_image).into(profileImage);
}
if(dataSnapshot.child(senderUserId).exists()){
senderUserImage = dataSnapshot.child(senderUserId).child("image").getValue().toString();
senderUserName = dataSnapshot.child(senderUserId).child("name").getValue().toString();
}
TextView info_txt = (TextView) findViewById(R.id.txt);
info_txt.setText("in attesa che " + receiverUserName + " accetti l'invito..."); //concatenazione per testo sotto al nome
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) { }
});
}
@Override
protected void onStart() {
super.onStart();
userRef.child(reciverUserId)
.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (!checker.equals("clicked") && !dataSnapshot.hasChild("Calling") && !dataSnapshot.hasChild("Ringing")){
final HashMap<String, Object> callingInfo = new HashMap<>();
callingInfo.put("calling", reciverUserId);
userRef.child(senderUserId)
.child("Calling")
.updateChildren(callingInfo)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
final HashMap<String, Object> ringingInfo = new HashMap<>();
ringingInfo.put("ringing", senderUserId);
userRef.child(reciverUserId)
.child("Ringing")
.updateChildren(ringingInfo);
}
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) { }
});
userRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.child(senderUserId).hasChild("Ringing") && !dataSnapshot.child(senderUserId).hasChild("Calling")){
addNotification();
acceptCallBtn.setVisibility(View.VISIBLE);
}
if (dataSnapshot.child(reciverUserId).child("Ringing").hasChild("picked"))
{
Intent intent = new Intent(CallingActivity.this, VideoCallActivity.class);
startActivity(intent);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) { }
});
}
private void cancelCallingUser() {
//sender
userRef.child(senderUserId)
.child("Calling")
.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.hasChild("calling"))
{
callingId = dataSnapshot.child("calling").getValue().toString();
userRef.child(callingId)
.child("Ringing")
.removeValue()
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
userRef.child(senderUserId)
.child("Calling")
.removeValue()
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
startActivity(new Intent(CallingActivity.this, RegistrationActivity.class));
finish();
}
});
}
}
});
} else {
startActivity(new Intent(CallingActivity.this, RegistrationActivity.class));
finish();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
//receiver
userRef.child(senderUserId)
.child("Ringing")
.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.hasChild("ringing"))
{
ringingId = dataSnapshot.child("ringing").getValue().toString();
userRef.child(ringingId)
.child("Calling")
.removeValue()
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
userRef.child(senderUserId)
.child("Ringing")
.removeValue()
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
startActivity(new Intent(CallingActivity.this, RegistrationActivity.class));
finish();
}
});
}
}
});
}
else {
startActivity(new Intent(CallingActivity.this, RegistrationActivity.class));
finish();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.conta.ftof">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".donate" />
<activity android:name=".VideoCallActivity" />
<activity android:name=".CallingActivity" />
<activity android:name=".ProfileActivity" />
<activity android:name=".FindPeopleActivity" />
<activity android:name=".NotificationsActivity" />
<activity android:name=".SettingsActivity" />
<activity
android:name=".ContactsActivity"
android:label="@string/title_activity_main" />
<activity android:name=".RegistrationActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-3400243939195187~6852949310"/>
<receiver android:name=".ReminderBroadcast"/>
</application>
</manifest>
1 个解决方案
解决方案1
0 2020-10-21 15:32:22
根据NotificationCompat文档：
public Builder (Context context, String channelId)
使用默认值构造一个新的 Builder：
- context Builder 将使用的 Context 来构造RemoteViews 。
- channelId String：构造的通知将发布在此 NotificationChannel 上。
上下文是有关应用程序环境的全局信息的接口。 这是一个抽象类，其实现由Android系统提供。 它允许访问特定于应用程序的资源和类，以及调用应用程序级操作，例如启动活动、广播和接收意图等。
这样，Android 操作系统通过 Context 控制应用程序可以或不可以向用户呈现什么，从而防止任何应用程序在它想要的时候显示它想要的东西。
因此，您可以呈现通知的方式是传递一个Context do 构建器，该构建器有权构建远程视图，并且您的应用程序会在用户打开它或应用程序收到诸如推送通知之类的广播消息时接收此上下文。
public class PushNotificationReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
//at this point the context has the permission to create remote views
addNotification(context);
setResultCode(Activity.RESULT_OK);
}
private void addNotification(Context context) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
NotificationChannel channel =
new NotificationChannel("MyNotifications", "MyNotifications", NotificationManager.IMPORTANCE_DEFAULT);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel);
}
NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "MyNotifications")
.setContentTitle("Chiamata in arrivo")
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(true)
.setContentText("Apri FtoF per partecipare alla videochiamata");
NotificationManagerCompat manager = NotificationManagerCompat.from(context);
manager.notify(999, builder.build());
}
}
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