当我使用 Instant Run 时，我的应用程序运行良好，但是，当我尝试调试它或不使用 Instant Run 时，它在 Logcat 中给了我这个：
04-24 22:16:15.864 22359-22359/com.clairvoyance.bookmarket E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.clairvoyance.bookmarket, PID: 22359
com.google.firebase.database.DatabaseException: No properties to serialize found on class com.clairvoyance.bookmarket.User
at com.google.android.gms.internal.zzeph.<init>(Unknown Source)
at com.google.android.gms.internal.zzepg.zzf(Unknown Source)
at com.google.android.gms.internal.zzepg.zzb(Unknown Source)
at com.google.android.gms.internal.zzepg.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.clairvoyance.bookmarket.ActMainActivity$1.onDataChange(ActMainActivity.java:55)
at com.google.firebase.database.zzp.onDataChange(Unknown Source)
at com.google.android.gms.internal.zzejp.zza(Unknown Source)
at com.google.android.gms.internal.zzelk.zzcal(Unknown Source)
at com.google.android.gms.internal.zzelq.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6228)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
我试过搞乱我的亲守规则。我不确定这是否正确：
# Uncomment this to preserve the line number information for
# debugging stack traces.
-keepattributes SourceFile,LineNumberTable
# If you keep the line number information, uncomment this to
# hide the original source file name.
-renamesourcefileattribute SourceFile
-keep class com.firebase.** { *; }
-keep class org.apache.** { *; }
-keepnames class com.fasterxml.jackson.** { *; }
-keepnames class javax.servlet.** { *; }
-keepnames class org.ietf.jgss.** { *; }
-dontwarn org.w3c.dom.**
-dontwarn org.joda.time.**
-dontwarn org.shaded.apache.**
-dontwarn org.ietf.jgss.**
# Add this global rule
-keepattributes Signature
-keepclassmembers class com.clairvoyance.bookmarket.** {
*;
}
我的调试器专注于这一行：
mainUser = dataSnapshot.getValue(User.class);
所以我花了很多时间检查我的用户类，看看那里是否有任何问题。这是我的 ActMainActivity 和用户类中的函数：
主要活动：
public class ActMainActivity extends AppCompatActivity implements
BookListFragment.OnListFragmentInteractionListener {
User mainUser;
ViewPager actViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setToolbar();
actViewPager = findViewById(R.id.main_pager);
setMainUser();
}
private void setToolbar() {
Toolbar myToolbar = findViewById(R.id.main_toolbar);
myToolbar.setTitleTextColor(Color.parseColor("#FFFFFF"));
myToolbar.setTitle(R.string.app_name);
setSupportActionBar(myToolbar);
// Get a support ActionBar corresponding to this toolbar
}
private void setMainUser() {
String uid = WebServiceHandler.getUID();
if (uid == null) {
illegalAccess();
return;
}
DatabaseReference userRef = WebServiceHandler.getRootRef().child("users").child(uid);
userRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.exists()) {
illegalAccess();
} else {
Log.d("MainActivityCycle", "mainUserSet");
mainUser = dataSnapshot.getValue(User.class); // Line 55 Where logcat points to
if (mainUser != null) {
// Set up the GUI now that the mainUser is set (we'll need its data)
actViewPager.setAdapter(new MainPagerAdapter(getSupportFragmentManager(), mainUser));
actViewPager.setCurrentItem(1);
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
用户等级：
package com.clairvoyance.bookmarket;
import com.google.firebase.database.IgnoreExtraProperties;
import java.io.Serializable;
import java.util.HashMap;
/**
* Created by Sathya on 12/21/2017.
*
*/
// Todo: Implement Parcelable (for argument passing in bundles in fragments)
@IgnoreExtraProperties
class User implements Serializable {
private String name;
private String email;
private HashMap<String, Object> bookIDs = new HashMap<>();
// Key is bookID!!! - Value is requestID!!!!
private HashMap<String, String> myRequestIDs = new HashMap<>();
private boolean isEmailVerified = false;
private String registrationToken;
public User(){ }
User(String email){
this.email = email;
}
void setName(String name) {
this.name = name;
}
void setEmailVerified(boolean emailVerified) { isEmailVerified = emailVerified; }
void addBook(Book book){
bookIDs.put(book.getBookID(), true);
}
void addMyRequest(Request request){
myRequestIDs.put(request.getBookID(), request.getRequestID());
}
void setRegistrationToken(String registrationToken) {
this.registrationToken = registrationToken;
}
String getName() {
return name;
}
String getEmail() {
return email;
}
boolean isEmailVerified() {
return isEmailVerified;
}
HashMap<String, Object> getBookIDs() {
return bookIDs;
}
HashMap<String, String> getMyRequestIDs() {
return myRequestIDs;
}
String getRegistrationToken() {
return registrationToken;
}
}
提前致谢。