GIT COMMAND FOR REMOVING THE FOLDER IN GIT1. the build is folder name that you want to remove
git rm -r build
or
git rm -rf build
2. commit code with msg
git commit -m "unused code"
3. push your code in git
git push
Thursday, 11 November 2021
Git command for remove particular folder in git(bitbucket repo)
Monday, 18 October 2021
Interface java Example Interview
//interface Only public, static and final are allowed.
//No. Interfaces can’t have constructors.
interface Test{
static int s=2;
final int d=4;
void get();
int getmultiple();
}
// initializers not allowed in interfaces
/*interface demoStatic(){
{ System.out.println("empty implemented");}
static{
System.out.println("static implemented");
}
}*/
interface B{
int getdivide(int i);
// int getadd();//implementation is required in Class A
}
class A implements B{
public int getdivide(int i ){
return i*i;
}
}
class p{
interface Q{
int i=111;
}
}
interface NextTest extends Test{
int t=5;
void get();
int getadd();
// int getValue();//Demo is not abstract and does not override abstract method getValue() in NextTest
}
class Demo implements Test, NextTest {
public int getadd(){
return d+t;
}
public int getmultiple(){
return d*t;
}
public void get(){
System.out.println("demo get method implemented");
}
}
class XDemo extends Demo{
}
/*class XXDemo implements NextTest{
void methodD(){
i=4;
//No, because interface fields are static and
//final by default and you can’t change
//their value once they are initialized. In the above code, methodB()
//is changing value of interface field A.i. It shows compile time error.
}
}*/
public class MyClass {
public static void main(String args[]) {
System.out.println("Interface");
Test s=new XDemo();
s.get();
// System.out.println("sum : "+ s.getadd());//it will check in Test interface error not found
System.out.println("multiple : "+ s.getmultiple());
NextTest st=new XDemo();
System.out.println("add : "+ st.getadd());
// XDemo s=new NextTest();//NextTest is abstract; cannot be instantiated
XDemo sp=new XDemo();
System.out.println("addd : "+ sp.getadd());
System.out.println("multiple : "+ sp.getmultiple());
B newS=new A();
System.out.println("divide : "+ newS.getdivide(12));
// p ps=new Q();
B bs=new B(){
public int getdivide(int i){
return i*i; }
};
System.out.println("divide : "+ bs.getdivide(12));
}
}
Find the character element which appears maximum number of times in an String
//Find the element which appears maximum number of times in an array
import java.util.Arrays;
public class MyClass {
public static void main(String args[]) {
String name="amitrawat";
char[] word=name.toCharArray();
for(int i=0;i<word.length;i++){
for(int j=i+1;j<word.length;j++){
char first=word[i];
char second=word[j];
char temp;
if(first>second){
temp=first;
word[i]=second;
word[j]=temp;
}
}
}
System.out.println("max number : " + String.valueOf(word));
//getting max character and times
char maxchar=word[0];
int times=0;
for(int i=0;i<word.length;i++){
char w=word[i];
if(maxchar==w){
times++;
}else if(maxchar<w){
times=1;
maxchar=w;
}
}
System.out.println("char max : " + maxchar);
System.out.println("char times: " + times);
}
}
OUTPUT
max number : aaaimrttw
char max : w
char times: 1
Find the element which appears maximum number of times in an array
import java.util.Arrays;
public class MyClass {
public static void main(String args[]) {
int max = 0, count = 0;
int[] a={1,2,3,4,8,8,9,8,3,3,5,3,4,5,6,8};
//sorting array
for(int i=0;i<a.length;i++){
for(int j=i+1;j<a.length;j++){
int first=a[i];
int second=a[j];
int temp=0;
if(first>second){
temp=first;
a[i]=second;
a[j]=temp;
}
}
}
// Arrays.sort(a);
//finding highest number with times
for(int i=0;i<a.length;i++){
int num=a[i];
if(max==num){
count++;
}else if(max<num){
max=num;
count=1;
}
}
System.out.println("max number : " + max);
System.out.println("times: " + count);
}
}
OUTPUT
max number : 9
times: 1
Monday, 11 October 2021
Overloading and overriding Interview Example Code
class Test {
static int s = 4;
final int d = 5;
static void sit() {
System.out.println(" sit method of test class ");
}
void get() {
System.out.println(" get method test class");
}
}
class Test1 extends Test {
static int s = 6;
static int a = 2;
final int d = 3;
static void sit() {
System.out.println("sit method test1 class");
}
void get() {
System.out.println("get method get test1 class");
}
}
class Test2 extends Test1 {
static int s = 7;
static void sit() {
System.out.println("sit method test2 class");
}
void get() {
System.out.println("get method get test2 class");
}
}
class Demo {
}
public class HelloWorld {
public static void main(String[] args) {
System.out.println("1 : test2 class instance of test2 class.......... ");
System.out.println();
Test2 obj2 = new Test2();
//class c inherit static
System.out.println("static varialble : " + obj2.a); // 2
System.out.println();
System.out.println("final varibale : " + obj2.d); //3
System.out.println();
obj2.sit();//print method of test2 class
System.out.println();
System.out.println();
System.out.println("2 : test1 class instance of test2 class.......... ");
System.out.println();
Test1 obj1 = new Test2();
obj1.sit();// print method of class test1 : static method
System.out.println();
obj1.get();//print method of class test2 :non static method
System.out.println();
//testing the type cast
Test objtrail1 = new Test1();//correct
Test objtrail2 = new Test2();//correct
// Test1 cannot be converted to Test2
// Test2 objtrail3=new Test1();//incorrect type cast error
// incompatible types: Test cannot be converted to Test2
// Test2 objtrail3=new Test();//incorrect type cast error
// Test1 obje=new Test();//error: incompatible types: Test cannot be converted to Test1
System.out.println();
System.out.println();
System.out.println("3 : test class instance of test1 class.......... ");
Test obje = new Test1();//the instance of test1 but print the static and final variable and static method of test
System.out.println();
System.out.println("print the static variable of test class " + obje.s);//4
System.out.println();
System.out.println("print the final variable of test class " + obje.d);//5
System.out.println();
obje.sit();//print the method of static test class
System.out.println();
obje.get();//print method of non static test1 class
System.out.println();
// System.out.println("3 : test2 class instance of test class.......... ");
// Test2 objet=new Test();
// objet.sit();//error: incompatible types: Test cannot be converted to Test2
// Test2 objet=new Test1();//error: incompatible types: Test1 cannot be converted to Test2
// Test s=new Demo();//error: incompatible types: Demo cannot be converted to Test
}
}
output :
1 : test2 class instance of test2 class..........
static varialble : 2
final varibale : 3
sit method test2 class
2 : test1 class instance of test2 class..........
sit method test1 class
get method get test2 class
3 : test class instance of test1 class..........
print the static variable of test class 4
print the final variable of test class 5
sit method of test class
get method get test1 class
Monday, 20 September 2021
LocaleHelper for language change
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.LocaleList;
import android.preference.PreferenceManager;
import java.util.Locale;
public class LocaleHelper {
private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";
public static String getLanguage(Context context) {
return getPersistedData(context, Locale.getDefault().getLanguage());
}
public static Context setNewLocale(Context mContext, String language) {
persist(mContext, language);
return updateLocale(mContext, getLanguage(mContext));
}
public static Context setLocale(Context context) {
persist(context, getLanguage(context));
return updateLocale(context, getLanguage(context));
}
private static String getPersistedData(Context context, String defaultLanguage) {
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
}
private static void persist(Context context, String language) {
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(SELECTED_LANGUAGE, language);
editor.apply();
}
private static Context updateLocale(Context context, String lang) {
Resources resources = context.getResources();
Configuration configuration = resources.getConfiguration();
Locale localeToSwitchTo = new Locale(lang);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
configuration.setLocale(localeToSwitchTo);
LocaleList localeList = new LocaleList(localeToSwitchTo);
LocaleList.setDefault(localeList);
configuration.setLocales(localeList);
context = context.createConfigurationContext(configuration);
} else {
Locale.setDefault(localeToSwitchTo);
configuration.locale = localeToSwitchTo;
resources.updateConfiguration(configuration, resources.getDisplayMetrics());
}
return context;
}
}
//Activity class
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(LocaleHelper.setLocale(base));
}
private void setNewLocale(Context mContext, String language) {
try {
LocaleHelper.setNewLocale(this, language);recreate();//recreate activity
} catch (Exception e) {
e.printStackTrace();
FirebaseCrashlytics.getInstance().recordException(e);
}
}
Friday, 23 April 2021
In Android EditText, how to force writing uppercase?
In Android EditText, how to force writing uppercase?
@Override
public void setFilters(InputFilter[] filters) {
try {
InputFilter[] oldFilter = filters;
InputFilter[] newFilters = new InputFilter[oldFilter.length + 1];
System.arraycopy(oldFilter, 0, newFilters, 0, oldFilter.length);
newFilters[newFilters.length - 1] = new InputFilter.AllCaps();
super.setFilters(newFilters);
} catch (Exception e) {
e.printStackTrace();
FirebaseCrashlytics.getInstance().recordException(e);
}
}
Disabling Android O auto-fill service for an application
So I have my own class which is extends the android.support.v7.widget.AppCompatEditText
and all I did is overwrote the following method with the following value:
@Override
public int getAutofillType() {
return AUTOFILL_TYPE_NONE;
}
no other solutions worked, not even android:importantForAutofill="no".
getAutofillType() comes from the View class, so it should work for every other
class such as TextInputEditText too!
Monday, 12 April 2021
Firebase : -Firestore Live Location
FIRESTORE Live Location
AUTHENTICATION:-
EDIT RULES :-
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /dev/{userId} {
allow read, update, delete: if request.auth.uid == userId;
allow create: if request.auth.uid != null;
match /LiveData/{userId} {
allow read, update, delete,create: if request.auth.uid != null;
}
}
}
}
ANDROID CODE:
String token;
FirebaseAuth authref;private FirebaseFirestore db;<string name="FIREBASE_DATABASE_NAME">dev</string><string name="FIREBASE_DATABASE_NODE_NAME">LiveData</string>
<string name="FIREBASE_EMAIL_DB">amitrawat@gmail.com</string>
<string name="FIREBASE_PASS_DB">123456789</string>@Override
public void onCreate() {
super.onCreate();
try {setup();notificationToken();
loginFirebase();
} catch (Exception e) {
e.printStackTrace();
}
}public void setup() {
db = FirebaseFirestore.getInstance();
}
private void notificationToken() throws Exception {
try {
FirebaseInstanceId.getInstance().getInstanceId()
.addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
@Override
public void onComplete(@NonNull Task<InstanceIdResult> task) {
if (!task.isSuccessful()) {
return;
}
token = task.getResult().getToken();
Log.e("token", token);
}
});
} catch (Exception e) {
throw new Exception(e);
}
}
private void loginToFirebase() {
//Authenticate with Firebase, using the email and password we created earlier//
String email = getString(R.string.FIREBASE_EMAIL_DB);
String password = getString(R.string.FIREBASE_PASS_DB);
//Call OnCompleteListener if the user is signed in successfully//
authref = FirebaseAuth.getInstance();
authref.signInWithEmailAndPassword(
email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(Task<AuthResult> task) {
if (task.isSuccessful()) {
try {
requestLocationUpdates();
} catch (Exception e) {
}
} else {
Log.d(TAG, "Firebase authentication failed");
}
}
});
}private void requestLocationUpdates() {
LocationRequest request = new LocationRequest();
request.setInterval(60000);
request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
FusedLocationProviderClient client = LocationServices.getFusedLocationProviderClient(this);
int permission = ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION);
//If the app currently has access to the location permission...//
if (permission == PackageManager.PERMISSION_GRANTED) {
//...then request location updates//
client.requestLocationUpdates(request, new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
//Get a reference to the database, so your app can perform read and write operations//
if (isNullOrEmpty(token)) {
try {
notificationToken();
} catch (Exception e) {
e.printStackTrace();
Util.Crash(e);
}
} else {
try {
Location location = locationResult.getLastLocation();
if (location != null) {
FirebaseDTO locdto = new FirebaseDTO ();
locdto.setLatitude(location.getLatitude());
locdto.setLongitude(location.getLongitude());
locdto.setLastUpdatedOn(String.valueOf(new Timestamp(System.currentTimeMillis())));
Log.e("loc1", String.valueOf(location.getLatitude()));
Log.e("loc2", String.valueOf(location.getLongitude()));
// Add a new document with a generated ID\
db.collection(getResources().getString(R.string.FIREBASE_DATABASE_NAME)).
document(authref.getUid()).
collection(getResources().getString(R.string.FIREBASE_DATABASE_NODE_NAME)).
document(token).
set(locdto)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Log.d(TAG, "DocumentSnapshot successfully written!");
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG, "Error writing document", e);
}
});
}
} catch (Exception e) {
Util.Crash(e);
}
}
}
}, null);
}
}public class FirebaseDTO {
private double latitude;
private double longitude
private String lastUpdatedOn;
}
Monday, 5 April 2021
Alert Dialog in flutter
Alert Dialog in flutter
new IconButton(
icon: new Icon(Icons.cloud_download_rounded),
highlightColor: Colors.orange,
iconSize: 30,
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return getDialogBox();
});
},
),method of AlertDialog
AlertDialog getDialogBox() {
return AlertDialog(
title: Row(children: [
new IconButton(
icon: new Icon(Icons.warning_amber_outlined),
color: Colors.black45,
highlightColor: Colors.orange,
iconSize: 30,
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return getDialogBox();
});
},
),
/* Image.network(
'https://flutter-examples.com/wp-content/uploads/2019/12/android_icon.png',
width: 50,
height: 50,
fit: BoxFit.contain,
),*/
Text(' Download ')
]),
content: Text("Are You Sure Want To Proceed?"),
actions: <Widget>[
TextButton(
child: Text("YES"),
onPressed: () {
//Put your code here which you want to execute on Yes button click.
Navigator.of(context).pop();
},
),
TextButton(
child:
Text("CANCEL"),
onPressed: () {
//Put your code here which you want to execute on Cancel button click.
Navigator.of(context).pop();
},
),
],
);
}
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