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Create Button In A Fragment

Hello Im new to android i want to ask how do i do intent inside the fragment layout
any answers i would really appreciate
here is the code :
for HomeFragment.java
package com.example.splashscreen;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.net.wifi.hotspot2.pps.HomeSp;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import com.denzcoskun.imageslider.ImageSlider;
import com.denzcoskun.imageslider.constants.ScaleTypes;
import com.denzcoskun.imageslider.models.SlideModel;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {#link Fragment} subclass.
* Use the {#link HomeFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class HomeFragment extends Fragment implements View.OnClickListener {
// Initiate
Button button;
View rootView;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public HomeFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment HomeFragment.
*/
// TODO: Rename and change types and number of parameters
public static HomeFragment newInstance(String param1, String param2) {
HomeFragment fragment = new HomeFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#SuppressLint("WrongViewCast")
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**Button btnMoveActivity = (Button) rootView.findViewById(R.id.btn1);
btnMoveActivity.setOnClickListener((View.OnClickListener) this);
ImageSlider imageSlider = getActivity().findViewById(R.id.image_slider);
List<SlideModel> slideModel=new ArrayList<>();
slideModel.add(new SlideModel(R.drawable.kucing2, ScaleTypes.FIT));
slideModel.add(new SlideModel(R.drawable.kucing1,ScaleTypes.FIT));
slideModel.add(new SlideModel(R.drawable.kucing2,ScaleTypes.FIT));
imageSlider.setImageList(slideModel,ScaleTypes.FIT);
**/
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootView = inflater.inflate(R.layout.fragment_home, container, false);
return inflater.inflate(R.layout.fragment_home, container, false);
}
public void onViewCreated(View view,Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
button = (Button) rootView.findViewById(R.id.btn1);
button.setOnClickListener(view1 -> {
switch (view1.getId()){
case R.id.btn1:
Intent moveIntent = new Intent(MainActivity.this,MoveActivity.class); // my button isn't working here
startActivity(moveIntent);
break;
}
});
}
#Override
public void onClick(View view) {
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.splashscreen">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.Splashscreen">
<activity
android:name=".Splashscreen"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity">
</activity>
</application>
</manifest>
my button cant do intent and i've try several methods that i cant understand i want to add image slider later but I prefer the button first
thank you for your valuable answer

I'm not sure if this would work in your case, but if you want to access the fragment's host activity and use it for that Intent you can try this
Activity myParentActivity = (MainActivity) getActivity();
Intent moveIntent = new Intent(myParentActivity, MoveActivity.class);
or this
Activity myParentActivity = (MainActivity) requireActivity();
Intent moveIntent = new Intent(myParentActivity, MoveActivity.class);
put this in your AndroidManifest.xml
<activity android:name=".MoveActivity"/>

E/RecyclerView: No adapter attached; Skipping layout ERROR Android Studio with API 29 [duplicate]

This question already has answers here:
recyclerview No adapter attached; skipping layout
(38 answers)
Closed 1 year ago.
So I was following a video to do a news app from scratch in Android Studio and I encountered the error of the title. I tried to follow many of the answers in questions about the same error but its hard to understand because everyone has different codes as I spected. So here is my Adapter code:
package com.example.newsapp4;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;
import com.example.newsapp4.Model.Articles;
import com.squareup.picasso.Picasso;
import java.util.List;
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
Context context;
List<Articles> articles;
public Adapter(Context context, List<Articles> articles) {
this.context = context;
this.articles = articles;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.items, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
final Articles a = articles.get(position);
String imageUrl = a.getUrlToImage();
holder.tvTitle.setText(a.getTitle());
holder.tvSource.setText(a.getSource().getName());
holder.tvDate.setText(a.getPublishedAt());
Picasso.with(context).load(imageUrl).into(holder.imageView);
}
#Override
public int getItemCount() {
return articles.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView tvTitle,tvSource,tvDate;
ImageView imageView;
CardView cardView;
public ViewHolder(#NonNull View itemView) {
super(itemView);
tvTitle = itemView.findViewById(R.id.tvTitle);
tvSource = itemView.findViewById(R.id.tvSource);
tvDate = itemView.findViewById(R.id.tvDate);
imageView = itemView.findViewById(R.id.image);
cardView = itemView.findViewById(R.id.cardView);
}
}
}
And here is my java class where I call the adapter with the recyclerview:
package com.example.newsapp4;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import com.example.newsapp4.Model.Articles;
import com.example.newsapp4.Model.Headlines;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class sportsnews extends AppCompatActivity {
Adapter adapter;
Intent intencion;
RecyclerView recyclerView;
final String API_KEY = "my api key";
List<Articles> articles = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sportsnews);
recyclerView = findViewById(R.id.recyclerView1);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
String country = getCountry();
retrieveJson(country, API_KEY);
}
public void retrieveJson(String country, String apiKey){
Call<Headlines> call = ApiClient.getInstance().getApi().getHeadlines(country, apiKey);
call.enqueue(new Callback<Headlines>() {
#Override
public void onResponse(Call<Headlines> call, Response<Headlines> response) {
if(response.isSuccessful() && response.body().getArticles() != null){
articles.clear();
articles = response.body().getArticles();
adapter = new Adapter(sportsnews.this,articles);
recyclerView.setAdapter(adapter);
}
}
#Override
public void onFailure(Call<Headlines> call, Throwable t) {
Toast.makeText(sportsnews.this, t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
}
});
}
public String getCountry(){
Locale locale = Locale.getDefault();
String country = locale.getCountry();
return country.toLowerCase();
}
public void aPerfil(View vista){
intencion = new Intent(this, profile_activity.class);
startActivity(intencion);
}
}
Notice that there is a method that goes with a button that is not applicated. The method is aPerfil.
This here is my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.newsapp4">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".sportsnews" android:screenOrientation="locked"/>
<activity android:name=".profile_activity" android:screenOrientation="locked"/>
<activity android:name=".menuContent" android:screenOrientation="locked"/>
<activity android:name=".MainActivity" android:screenOrientation="locked">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="preloaded_fonts"
android:resource="#array/preloaded_fonts" />
</application>
</manifest>
There are more activities before reaching the one that has the adapter.
Im guessing that in my api key I need to put the key that the webpage give me, something like a lot of numbers and letters, not a link.
Feel free to ask for more code if you need it.
Thanks for your time!

move below code from onResponse to onCreate before retrieveJson(country, API_KEY);
adapter = new Adapter(sportsnews.this,articles);
recyclerView.setAdapter(adapter);
Create a setter in your Adapter something like below
public void setArticles(List<Articles> newArticle) {
if (newArticle != null && newArticle.size() > 0) {
this.articles = newArticle;
notifyDataSetChanged();
}
}
Then in your onResponse write something like below where earlier you were setting adapter in recylerview.
adapter.setArticles(articles)
Note: recylerView should always be attached to adapter when its inflating, you just cannot wait for API response because that runs on diff thread and will take time to fetch data till that time, OS will already try to inflate the recylerview and will fail if there is no adapter attached.
So we should always attach the adapter even with empty data as that is not the problem you can pass the data when you received it from API and then call notifyDataSetChanged() and then the adapter will take care of inflating each item.

Android - by clicking instead of going forward is back to the previous page

I use Android Studio, created four new activity each button. I try every button leads to the next page.
After I attach all the buttons I run the app and it really works.
When I press the button on the first page it takes me to the second page, but when I press the button on the second page to go to the third, it takes me back to the first page.
first activity:
package liranbenzino.kids;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View viewBtnClick) {
// link to class
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
startActivity(intent);
}});
}}
second activity:
package liranbenzino.kids;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class Main2Activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View viewBtnClick1) {
// link to class
Intent intent = new Intent(Main2Activity.this,Main3Activity.class);
startActivity(intent);
}});
}
}
thied activity:
package liranbenzino.kids;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class Main3Activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View viewBtnClick) {
// link to class
Intent intent = new Intent(Main3Activity.this,Main4Activity.class);
startActivity(intent);
}});
}
}
four activity:
package liranbenzino.kids;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import android.view.View;
public class Main4Activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main4);
findViewById(R.id.button4).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View viewBtnClick) {
Toast.makeText(Main4Activity.this,"NAME", Toast.LENGTH_LONG).show();
}});
}}
AndroidMenifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="liranbenzino.kids">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Main2Activity" />
<activity android:name=".Main3Activity" />
<activity android:name=".Main4Activity"></activity>
</application>
</manifest>
thank'S

Your code is ok
How your decide that you back to firstPage when your click 2nd activity button. your code is ok.. use label in each page. then try ...
May be your some button label is same and you become confuse in which page you are in..
You can change your button label as First_Page_Button,Second_Page_Button,Third_Page_Button etc to decide in which page you are...

in each activity change the INTENT name for example in activity2 change
Intent intent = new Intent(Main2Activity.this,Main3Activity.class);
startActivity(intent);
to
Intent intent2 = new Intent(Main2Activity.this,Main3Activity.class);
startActivity(intent2);

Preventing WebView reload on Rotate - Android Studio

When I rotate my screen, the WebView reloads the whole page. So I disabled rotation in Android_Manifest.xml file, but it would be really cool if I could make rotation possible.
SkateTube.java -
package com.example.skatetube.skatetube;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class SkateTube extends AppCompatActivity {
private WebView mWebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_skatetube);
mWebView = (WebView) findViewById(R.id.activity_main_webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
if (savedInstanceState == null)
{
mWebView.loadUrl("http://skatetube.sytes.net/");
mWebView.setWebViewClient(new WebViewClient());
}
#Override
public void onBackPressed() {
if(mWebView.canGoBack()) {
mWebView.goBack();
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_skate_tube, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Android_manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.skatetube.skatetube">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".SkateTube"
android:theme="#style/AppTheme.NoActionBar"
android:configChanges="keyboard|keyboardHidden|orientation"
android:label="State preserving implementation"/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>

There are 3 points must be done. This is a full solution for me.
AndroidManifest.xml need config both orientation and screenSize in android:configChanges for target activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.skatetube.skatetube">
<application
<activity android:name=".WebViewActivity"
android:configChanges="orientation|screenSize">
</activity>
</application>
</manifest>
Need to override onSaveInstanceState and onRestoreInstanceState of Activity to make state can be restore when rotated
#Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
mWebView.restoreState(savedInstanceState);
}
Not loading URL again when screen rotate, use savedInstanceState to know current status in onCreate() of target activity
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
mWebView = (WebView) findViewById(R.id.webView_h5);
if (savedInstanceState == null) {
mWebView.loadUrl(url);
}
}
Miss any one of those three, my activity still reload.

All you need to do is Override onSaveInstanceState and onRestoreInstanceState.
#Override
protected void onSaveInstanceState(Bundle outState ){
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState){
super.onRestoreInstanceState(savedInstanceState);
mWebView.restoreState(savedInstanceState);
}
and one other solution could be to update your Activity tag in manifest to
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"

well no need of java code just copy this code in place of your activity tag in Manifest.xml
<activity
android:name=".SkateTube"
android:theme="#style/AppTheme.NoActionBar"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:label="State preserving implementation"/>

Android app crashes on phone.

I've tried to develop my own app but now that i wanna see how it looks on my phone it says "Appname has stopped". Im installing the app via dropbox.
Here's a copy of the MainActivity.java
package com.example.aikk;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button mBtn1 = (Button) findViewById(R.id.northpowerramsor);
mBtn1.setOnClickListener((OnClickListener) this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/** Called when the user clicks the Send button */
public void onClick(View view) {
Log.i("clicks","You Clicked B1");
Intent i=new Intent(MainActivity.this, Ramsor.class);
startActivity(i);
// Do something in response to button
}
}
And here's a copy of Ramsor.java
public class Ramsor extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_Ramsor);
//Vettefan var det här är till med när jag skulle göra quick fix på den kom jag till nån knas layout sida
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
And the Android.Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.aikk"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="1"
android:targetSdkVersion="19"
android:maxSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.aikk.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.aikk.Ramsor"
android:label="#string/title_activity_ramsor"
android:parentActivityName="com.example.AIKK.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.AIKK.MainActivity" /> >
</activity>
</application>
</manifest>
Any thoughts would be GREATLY appreciated!

The problem is here , you are trying to cast the activity(this) to OnClickListener
mBtn1.setOnClickListener((OnClickListener) this);
The solution is to make your activity implements OnClickListener and create the unimplemented method

public class MainActivity extends Activity {
should be
public class MainActivity extends Activity implements OnClickListener {
There can be other reasons for the crash as well in which case it is better you post the stacktrace.
You can do as below using annonymous inner class
mBtn1.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
// do something
}
});

Change your class definition to implement OnClickListener:
public class MainActivity extends Activity implements OnClickListener {
...and set the click listener on mBtn1 as follows:
mBtn1.setOnClickListener(this);

try below this instead of mBtn1.setOnClickListener((OnClickListener) this);
mBtn1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
// Activity to do onclick .
}
});
return true;