Android 通知的意图未正确发送到其他活动
我试图在通知的意图中添加一个额外的内容,以便打开聊天活动,与给我发消息的用户进行对话。我传递给NotificationsListener的用户不为null。问题是,无论我尝试了什么其他调整,我总是会遇到这个错误:Android 通知的意图未正确发送到其他活动,android,android-intent,notifications,android-pendingintent,Android,Android Intent,Notifications,Android Pendingintent,我试图在通知的意图中添加一个额外的内容,以便打开聊天活动,与给我发消息的用户进行对话。我传递给NotificationsListener的用户不为null。问题是,无论我尝试了什么其他调整,我总是会遇到这个错误: 2021-04-27 21:46:57.679 13553-13553/com.example.videomeeting E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.videomeeting, PID
2021-04-27 21:46:57.679 13553-13553/com.example.videomeeting E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.videomeeting, PID: 13553
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.videomeeting/com.example.videomeeting.activities.ChatActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.videomeeting.models.User.getUserName()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3431)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7660)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.videomeeting.models.User.getUserName()' on a null object reference
at com.example.videomeeting.activities.ChatActivity.onCreate(ChatActivity.java:108)
at android.app.Activity.performCreate(Activity.java:8000)
at android.app.Activity.performCreate(Activity.java:7984)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3404)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7660)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
代码如下:
NotificationsListener.java
@Override
public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
Intent activityIntent = new Intent(this, ChatActivity.class);
FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
.child(remoteMessage.getData().get(KEY_USER_ID))
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
user = snapshot.getValue(User.class);
}
@Override
public void onCancelled(@NonNull DatabaseError error) { }
});
activityIntent.putExtra(Constants.INTENT_USER, user);
activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent contentIntent = PendingIntent.getActivity(
this,
0,
activityIntent,
FLAG_UPDATE_CURRENT
);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
processExtraData();
//Toolbar
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
TextView usernameTV = findViewById(R.id.usernameTV);
usernameTV.setText(remoteUser.getUserName()); //ERROR LINE
ChatActivity.java
@Override
public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
Intent activityIntent = new Intent(this, ChatActivity.class);
FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
.child(remoteMessage.getData().get(KEY_USER_ID))
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
user = snapshot.getValue(User.class);
}
@Override
public void onCancelled(@NonNull DatabaseError error) { }
});
activityIntent.putExtra(Constants.INTENT_USER, user);
activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent contentIntent = PendingIntent.getActivity(
this,
0,
activityIntent,
FLAG_UPDATE_CURRENT
);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
processExtraData();
//Toolbar
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
TextView usernameTV = findViewById(R.id.usernameTV);
usernameTV.setText(remoteUser.getUserName()); //ERROR LINE
我已经检查了通知接收者意图中的额外内容是否为空,是否为空。一定有一个细节我没有看到。谢谢您的时间。错误消息清楚地表明remoteUser尚未初始化或为null,您需要检查processExtraData()方法正在接收哪些数据,然后
如果(用户)getIntent().getSerializableExtra(INTENT\u用户)未返回用户,则问题出在NotificationsListener类中。首先,请确保传递给活动的用户不为null。我认为,
onDataChange
会在您将用户作为额外用户传递后触发。我认为它可能会对您有所帮助,如果没有,请查看和。谢谢大家,我只是在onDataChange中跟踪用户的值,这是不正确的,因为他的异步性。我进行此修复是为了避免空值:
while(!isFound) {
FirebaseDatabase.getInstance().getReference(KEY_COLLECTION_USERS)
.child(remoteMessage.getData().get(KEY_USER_ID))
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
user = snapshot.getValue(User.class);
isFound = true;
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
再次感谢。真的很感激