I use shared pref to store my array list of lamps as i use these data to put it into list view with custom array adapter but every time it crashes at the line where i transform the data into json to be saved in shared pref
String json1 = gson.toJson(lamps,type);
i don't know why please if anyone know how to fix it thanks in advance
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_light);
Bundle extras = getIntent().getExtras();
String name = null;
if (extras != null) {
name = extras.getString("name");
}
ArrayList<lamp> lamps = new ArrayList<lamp>();
SharedPreferences prefs= PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext());
Gson gson = new Gson();
SharedPreferences.Editor prefsEditor = prefs.edit();
String json = prefs.getString("lamp", null);
ArrayList<lamp> arraylist= new ArrayList<>();
if (json!=null) {
Type type = new TypeToken<ArrayList<lamp>>() {
}.getType();
arraylist = gson.fromJson(json, type);
lamps.addAll(arraylist);
}
if(extras!=null) {
lamps.add(new lamp(name));
}
LampAdapter adapter = new LampAdapter(this, lamps);
ListView listView = (ListView) findViewById(R.id.list_view);
listView.setAdapter(adapter);
if(!lamps.isEmpty()) {
Toast.makeText(this, "in", Toast.LENGTH_SHORT).show();
Type type = new TypeToken<ArrayList<lamp>>() {
}.getType();
String json1 = gson.toJson(lamps,type);
prefsEditor.putString("lamp", json1);
prefsEditor.commit();
}
}
Logcat it crsahes in light.java:53 at line 53 which is this code String json1 = gson.toJson(lamps,type);
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.mechantus, PID: 2438
java.lang.AssertionError: Missing field in com.google.android.gms.internal.zzajy$zza
at com.google.gson.internal.bind.TypeAdapters$EnumTypeAdapter.<init>(TypeAdapters.java:812)
at com.google.gson.internal.bind.TypeAdapters$30.create(TypeAdapters.java:838)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.Gson.toJson(Gson.java:653)
at com.google.gson.Gson.toJson(Gson.java:640)
at com.google.gson.Gson.toJson(Gson.java:595)
at com.example.android.mechantus.light.onCreate(light.java:53)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NoSuchFieldException: DEBUG
at java.lang.Class.getField(Class.java:891)
at com.google.gson.internal.bind.TypeAdapters$EnumTypeAdapter.<init>(TypeAdapters.java:801)
at com.google.gson.internal.bind.TypeAdapters$30.create(TypeAdapters.java:838)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:105)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53)
at com.google.gson.Gson.getAdapter(Gson.java:416)
at com.google.gson.Gson.toJson(Gson.java:653)
at com.google.gson.Gson.toJson(Gson.java:640)
at com.google.gson.Gson.toJson(Gson.java:595)
at com.example.android.mechantus.light.onCreate(light.java:53)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
lamp class
package com.example.android.mechantus;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class lamp {
String name;
public lamp( String name) {
this.name = name;
}
public String getName() {
return name;
}
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("Lamps");
public void on() {
myRef.child(name).setValue(1);
}
public void off() {
myRef.child(name).setValue(0);
}
}
build .gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.0"
defaultConfig {
applicationId "com.example.android.mechantus"
minSdkVersion 19
targetSdkVersion 24
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug{
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:design:24.2.0'
testCompile 'junit:junit:4.12'
compile 'com.google.code.gson:gson:2.6.2'
apply plugin: 'com.google.gms.google-services'
compile 'com.google.firebase:firebase-database:9.2.1'
}
buildTypes {
debug{
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
Add this lines to build.gradle file and learn proguard