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我创建了Android聊天应用程序，当我想打开聊天时，出现错误应用程序已停止工作，并且内部日志中出现异常： 'Firebase异常：未能弹出以键入' 为什么会发生这种错误？Android FirebaseException：无法弹出以输入
public class Chat extends AppCompatActivity
{
LinearLayout layout;
RelativeLayout layout_2;
ImageView sendButton;
EditText messageArea;
ScrollView scrollView;
Firebase reference1, reference2;
boolean timerProcessing = false;
String date = "";
String message;
String userName;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
layout = (LinearLayout) findViewById(R.id.layout1);
layout_2 = (RelativeLayout)findViewById(R.id.layout2);
sendButton = (ImageView)findViewById(R.id.sendButton);
messageArea = (EditText)findViewById(R.id.messageArea);
scrollView = (ScrollView)findViewById(R.id.scrollView);
Firebase.setAndroidContext(this);
reference1 = new Firebase("https://zipa1x.firebaseio.com/messages/" + UserDetails.username + "_" + UserDetails.chatWith);
reference2 = new Firebase("https://zipa1x.firebaseio.com/messages/" + UserDetails.chatWith + "_" + UserDetails.username);
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String messageText = messageArea.getText().toString();
if(!messageText.equals("")){
Map<String, String> map = new HashMap<String, String>();
map.put("message", messageText);
map.put("user", UserDetails.username);
reference1.push().setValue(map);
reference2.push().setValue(map);
messageArea.setText("");
}
}
});
reference1.addChildEventListener(new ChildEventListener()
{
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s)
{
Map map = dataSnapshot.getValue(Map.class);
message = map.get("message").toString();
userName = map.get("user").toString();
if (userName.equals(UserDetails.username))
{
//addMessageBox("You:\n" + message, 1);
addMessageBox(message, 1);
//sendNotification(message,userName);
} else
{
//addMessageBox(UserDetails.chatWith + ":\n" + message, 2);
addMessageBox(message, 2);
//sendNotification(message,userName);
}
}
@Override
public void onChildChanged(final DataSnapshot dataSnapshot, String s)
{
Bundle extras = getIntent().getExtras();
if (extras != null)
{
int value = extras.getInt("time");
final CountDownTimer timer = new CountDownTimer(value, 1)
{
public void onTick(long millisUntilFinished)
{
}
public void onFinish()
{
timerProcessing = false;
for (DataSnapshot child: dataSnapshot.getChildren())
{
dataSnapshot.getRef().removeValue();
}
}
};
}
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
scrollView.post(new Runnable() {
@Override
public void run() {
scrollView.fullScroll(View.FOCUS_DOWN);
}
});
}
public void addMessageBox(String message, int type)
{
sendNotification(message);
DateFormat df = new SimpleDateFormat("h:mm a");
date = df.format(Calendar.getInstance().getTime());
TextView textView1 = new TextView(Chat.this);
textView1.setText(date);
textView1.setTextSize(10);
TextView textView = new TextView(Chat.this);
textView.setText(message);
LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lp2.weight = 1.0f;
if(type == 1) {
lp2.gravity = Gravity.RIGHT;
textView.setBackgroundResource(R.drawable.left_bubble);
}
else{
lp2.gravity = Gravity.LEFT;
textView.setBackgroundResource(R.drawable.right_bubble);
}
textView.setLayoutParams(lp2);
layout.addView(textView);
textView1.setLayoutParams(lp2);
layout.addView(textView1);
scrollView.post(new Runnable() {
@Override
public void run() {
scrollView.fullScroll(View.FOCUS_DOWN);
}
});
}
private void sendNotification(String message)
{
Intent intent = new Intent(this,Chat.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_ONE_SHOT);
Uri notificationSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
NotificationCompat.Builder builder = (NotificationCompat.Builder) new NotificationCompat.Builder(this)
.setVisibility(Notification.VISIBILITY_PUBLIC)
//.setOngoing(true)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(userName)
.setContentText(message)
.setSound(notificationSound)
.setContentIntent(pendingIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotificationManager.notify(0, builder.build());
}
的logcat：
05-30 23:52:56.264 31908-31908/audiophileradio.example.com.audiophileradio
E/AndroidRuntime: FATAL EXCEPTION: main Process: audiophileradio.example.com.audiophileradio, PID: 31908
com.firebase.client.FirebaseException: Failed to bounce to type
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
at audiophileradio.example.com.audiophileradio.Chat$2.onChildAdded(Chat.java:99)
at com.firebase.client.core.ChildEventRegistration.fireEvent(ChildEventRegistration.java:61)
at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5476)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [map type; class java.util.LinkedHashMap, [simple type, class java.lang.Object] -> [simple type, class java.lang.Object]] from String value; no single-String constructor/factory method
at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator._createFromStringFallbacks(StdValueInstantiator.java:428)
at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:299)
at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:308)
at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:26)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:183)
at audiophileradio.example.com.audiophileradio.Chat$2.onChildAdded(Chat.java:99)
at com.firebase.client.core.ChildEventRegistration.fireEvent(ChildEventRegistration.java:61)
at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5476)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
android firebase
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06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio D/dalvikvm: VFY: replacing opcode 0x5b at 0x005d
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio D/dalvikvm: DexOpt: couldn't find field Landroid/app/Notification;.headsUpContentView
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio W/dalvikvm: VFY: unable to resolve instance field 20
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio D/dalvikvm: VFY: replacing opcode 0x5b at 0x004c
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio D/dalvikvm: DexOpt: couldn't find field Landroid/app/Notification;.headsUpContentView
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio I/dalvikvm: DexOpt: unable to optimize instance field ref 0x0014 at 0x54 in Landroid/support/v7/app/NotificationCompat;.addHeadsUpToBuilderLollipop
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio D/dalvikvm: DexOpt: couldn't find field Landroid/app/Notification;.headsUpContentView
06-07 00:23:47.679 8103-8103/audiophileradio.example.com.audiophileradio I/dalvikvm: DexOpt: unable to optimize instance field ref 0x0014 at 0x61 in Landroid/support/v7/app/NotificationCompat;.addHeadsUpToBuilderLollipop
06-07 00:23:47.699 8103-8103/audiophileradio.example.com.audiophileradio I/System.out: datasnaphot: DataSnapshot { key = -KlzVQr5A15Y6Is3qKCE, value = {message=b, user=} }
06-07 00:23:47.699 8103-8103/audiophileradio.example.com.audiophileradio E/datasnaphot:: DataSnapshot { key = -KlzVQr5A15Y6Is3qKCE, value = {message=b, user=} }
06-07 00:23:52.089 8103-8103/audiophileradio.example.com.audiophileradio I/System.out: datasnaphot: DataSnapshot { key = -KlzVRvdHnLr3MYweJ0x, value = {message=v, user=} }
06-07 00:23:52.089 8103-8103/audiophileradio.example.com.audiophileradio E/datasnaphot:: DataSnapshot { key = -KlzVRvdHnLr3MYweJ0x, value = {message=v, user=} }
添加错误的完整输出并注意引起此错误的行将有所帮助。看起来像一个类似的问题在这里回答：https：//stackoverflow.com/a/33923921/4816918 – Jeff
我已更新问题与日志下面的代码和错误是在这一行：Map map = dataSnapshot.getValue（Map.class）; – pavlestojanovic1906
看起来像你有确切的问题，上面链接的答案解决 – Jeff