Animated app(Launcher) icon

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• Android PDF Viewer null object reference error

  I am using barteksc Android PDF Viewer like many others (https://github.com/barteksc/AndroidPdfViewer). I keep receiving a null object reference error. This is the error.

  E/AndroidRuntime: FATAL EXCEPTION: main
                    Process: group6.interactivehandwriting, PID: 24037
                    java.lang.RuntimeException: Unable to start activity ComponentInfo{group6.interactivehandwriting/group6.interactivehandwriting.activities.RoomActivity.RoomActivity}: android.view.InflateException: Binary XML file line #9: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
  

  I have checked to make sure I am referencing the views correctly. The asset I am loading called "sample.pdf" is in my assets.

  * Can you see any reason why I am receiving this error? *

  I realize there are multiple post about this library, however every instance seems to be unique so I decided to go ahead and ask.

  RoomActivity.java

  package group6.interactivehandwriting.activities.RoomActivity;
  
  import android.content.res.AssetManager;
  import android.os.Bundle;
  import android.app.Activity;
  import android.util.Log;
  import android.view.View;
  
  import com.github.barteksc.pdfviewer.PDFView;
  import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;
  import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;
  import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle;
  
  import group6.interactivehandwriting.R;
  import group6.interactivehandwriting.activities.RoomActivity.views.DocumentView;
  import group6.interactivehandwriting.activities.RoomActivity.views.RoomView;
  
  public class RoomActivity extends Activity implements OnPageChangeListener, OnLoadCompleteListener {
      RoomView roomView;
      DocumentView docView;
      PDFView pView;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          Log.d("Android: ", "Setting content view to an instance of RoomView in: " + this.getClass().getName());
          setContentView(R.layout.activity_draw);
  
          System.out.println("Attempting to set ImageView..");
          pView = (PDFView) findViewById(R.id.pdfView);
          pView.fromAsset("sample.pdf").defaultPage(0)
                  .enableSwipe(true).swipeHorizontal(false).
                  onPageChange(this).enableAnnotationRendering(true).onLoad(this).scrollHandle(new DefaultScrollHandle(this)).load();
  
  
      }
  
      @Override
      public void onPageChanged(int page, int pageCount) {
          setTitle(String.format("%s %s / %s", "Sample", page + 1, pageCount));
      }
  
      @Override
      public void loadComplete(int nbPages) {
      }
  }
  

  AndroidManifest.xml

  <?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="group6.interactivehandwriting">
  
      <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
      <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=".activities.RoomActivity.RoomActivity"
              android:label="@string/title_activity_menu"
              android:theme="@style/AppTheme.NoActionBar">
              <intent-filter>
                  <action android:name="android.intent.action.MAIN" />
  
                  <category android:name="android.intent.category.LAUNCHER" />
              </intent-filter>
          </activity>
      </application>
  
  </manifest>
  

  activity_draw.xml

  <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".activities.RoomActivity.RoomActivity">
  
      <view
          android:id="@+id/room_view"
          id="@+id/view"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent" />
  
      <com.github.barteksc.pdfviewer.PDFView
          android:id="@+id/pdfView"
          android:layout_width="match_parent"
          android:layout_height="match_parent"/>
  
      <TextView
          android:id="@+id/textView"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginStart="8dp"
          android:layout_marginTop="8dp"
          android:text="@string/room"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent" />
  
  </android.support.constraint.ConstraintLayout>
  

  Dependencies:

  compile 'com.github.barteksc:android-pdf-viewer:2.8.2'
  
  compile 'org.apache.commons:commons-collections4:4.1'
  
• Trying to fit the settings activity in a fragment window - Android Studio

  I am working on an app and something troubles me, I want to create a settings activity in a fragment layout and the thing is that if I create a settings activity from the android studio's menu (this), there's no way that I can transform it into a fragment. I want to make it be this way (photo) .

  The thing is that when i change fragments, i use theFragment = new fragment_body();, where it is public class fragment_body extends Fragment, with its onCreateView of:

  public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
          return inflater.inflate(R.layout.view_settings, null);
      }
  

  where on the settings activity i don't have any of these things, i've tried multiple things but i don't know how to do it. Where the settings activity is: public class SettingsActivity extends PreferenceActivity. Please guide me of how to do this, Thanks in advance.
• Exception: com.android.volley.AuthFailureError is never thrown in the method

  I am using volley. In there I have added a method getParams. But AuthFailureError is getting grayed, when I type "return params" in the body. Due to which I am unable to save data in the database. I am wamp server. I have googled a lot but no luck.

  
• Adobe Animate gotoAndPlay on mouse scroll

  It's been a REALLY long time since using Flash and now have to use Adobe Animate for an HTML 5 Canvas project. I created the animation, set all the actions on the timeline to stop the timeline where I need it to be but now I need to know how to play the animation again from outside of another JS file (custom.js) inside my Animate JS file (animate.js)

  I've read a ton of articles and most reference the scope of this being the problem.

  Here's how I would imagine this would work.

  // On scroll of div
  <div onscroll="myFunction()">
  
  // inside my custom.js
    myFunction() {
      this.gotoAndPlay(2);
    };
  

  Some have said to set a var of

  var that=this;
  

  And then calling that.gotoAndPlay(2);

  Many thanks
• Android drawable animation?

  Is it possible to do an animation like this :Animation GIf

  If possible could someone please guide me on that?
• flutter animation forward class not working

  I am pretty new to flutter. It is not that hard but I am lost on this point of my code. I have initState firing an animation when the widget is loaded after navigating to it. I have as a workaround another animation at the end of initState to make sure that the animations are running. Without this workaround, none of the animations are fired, however when the class/page is hot reloaded the animation does work. I have included all the widget that are needed to understand the problems.

  import 'package:flutter/material.dart';
  import 'package:font_awesome_flutter/font_awesome_flutter.dart';
  import 'dart:async';
  import 'dart:convert';
  import 'package:http/http.dart' as http;
  import 'package:challengeme/code/globals.dart';
  import 'package:challengeme/code/widgets.dart';
  import 'package:challengeme/code/navigator.dart';
  import 'package:challengeme/code/AnimationSheet.dart';
  import 'package:challengeme/screens/home.dart';
  
  
  class completeProfile extends StatefulWidget {
   @override
   completeProfileState createState() => new completeProfileState();
  }
  
  class completeProfileState extends State<completeProfile>
      with TickerProviderStateMixin {
  
    AnimationSheet _animationName,  _animationLastname;   
    Animation _animation;
    Animation<double> _ResizeAnimation, _opacity;
    AnimationController _controller, _resizeBtn, _anim_controller;
  
    @override
    void initState() {
      super.initState();
  
      _controller = new AnimationController(duration: const Duration(milliseconds: 3000),vsync: this,);
      // use animations by importing them from the AnimationSheet
      _animationName = AnimationSheet(_controller, 0.00, 0.500);
  
      // this function is here to fire the control forward function, other wise the animations wont run
      _opacity = new CurvedAnimation(parent: _controller, curve: Curves.easeInOut)
      ..addListener((){
      setState((){
            });
      });
      _controller.forward().orCancel;
  
  
    }
  
    @override
    void dispose() {
      super.dispose();
      _controller.dispose();
    }
  
  
    @override
    Widget build(BuildContext context) {
      // this disables the android system back button
      return new WillPopScope(
       onWillPop: () async => false,
         child: new Scaffold(
            appBar: AppBar(
              title: Text('$pageTitle'),
              automaticallyImplyLeading: false,
              centerTitle: true,
              backgroundColor: const Color(0xFF0e1f2f),
        ),
        body: new Stack(
          fit: StackFit.expand,
          children: <Widget>[
            new Image(
              image: new AssetImage("assets/background_0.jpg"),
              fit: BoxFit.cover,
  //          colorBlendMode: BlendMode.darken,
  //          color: Colors.black12,
            ),
            new SingleChildScrollView(
                  child: new Theme(
                    data: new ThemeData(
                      brightness: Brightness.dark,
                      inputDecorationTheme: new InputDecorationTheme(
                      // hintStyle: new TextStyle(color: Colors.blue, fontSize: 20.0),
                      fillColor: const Color(0x26ffffff),
                      filled: true,
                      contentPadding: const EdgeInsets.only(bottom: 20.0),
                      labelStyle: new TextStyle(color: Colors.white, fontSize: 16.0, fontWeight: FontWeight.w700),
                      )
                    ),
                isMaterialAppTheme: true,
                child: new Container(
                   padding: const EdgeInsets.only(left: 20.0, right: 20.0, top: 60.0),
                child: new Column(
                        children: <Widget>[
                        new Opacity(
                          opacity:  animationSheet.easeInAnimation.value ,
                          child: new Container(
                            margin: EdgeInsets.only(bottom:10.0),
                          child: new TextFormField(
                            controller: getFirstName,
                            decoration: new InputDecoration(
                                labelText: '$name', 
                            ),
                            keyboardType: TextInputType.emailAddress,
                          ),
                        ),
                        ),
  

  This stack is not closed as it just serves as an example of the code.

  this is the animation class:

      import 'package:flutter/material.dart';
  
  class AnimationSheet {
    AnimationSheet(this.controller, this.begin, this.end)
  
  : easeInAnimation = new Tween(begin: 0.0, end: 1.0).animate(
      new CurvedAnimation(
        parent: controller,
        curve: new Interval(
         begin,
         end,
          curve: Curves.easeInOut,
        ),
      ),
    );
  
  
    final AnimationController controller;
    final double begin, end;
    final Animation<double> easeInAnimation, easeInAnimation2;
  
  
  }
  

  The focus of this problem is here I think:

   @override
        void initState() {
          super.initState();
  
          _controller = new AnimationController(duration: const Duration(milliseconds: 3000),vsync: this,);
          // use animations by importing them from the AnimationSheet
          _animationName = AnimationSheet(_controller, 0.00, 0.500);
  
          // this function is here to fire the control forward function, other wise the animations wont run
          _opacity = new CurvedAnimation(parent: _controller, curve: Curves.easeInOut)
          ..addListener((){
          setState((){
                });
          });
          _controller.forward().orCancel;
  

  I have no idea when i am doing wrong, maybe someone can tell me. Thanks.
• Missing required icon file - The bundle does not contain an app icon for iPhone / iPod Touch of exactly '120x120' pixels

  I'm having trouble uploading my app to the app store because it says I am missing app icons for specific devices. I have the app icons loaded in my project with the proper dimensions yet I still get this error. I am using Xcode 9. I've searched other answers and have come up with nothing.
• Image Asset Studio ignores Resize

  I'm usin the Image Asset Studio to replace the default app icon but whatever I try, the final app icon ignores my resize settings. Already tried to delete the app but the foreground images is still zoomed in as if I would have used No Trim and 100% scaling.
• How to change app name in notification bar programatically

  I want to change app name in the notification bar but I cannot find it simple solution. They say have to change app name. And I find this lib.

  https://github.com/myinnos/AppIconNameChanger

  But its too troublesome. Every changing take 10 seconds. Is there no chance to change only app name in the notification bar with a simple solution?

  

  Here my notification sample code

   NotificationCompat.Builder mBuilder =
              new NotificationCompat.Builder(this.getApplicationContext(), "notify_001");
      Intent ii = new Intent(this.getApplicationContext(), MainActivity.class);
      PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, ii, 0);
  
      NotificationCompat.BigTextStyle bigText = new NotificationCompat.BigTextStyle();
      bigText.bigText("Big text");
      bigText.setBigContentTitle("Big content title");
      bigText.setSummaryText("summary text");
  
      mBuilder.setContentIntent(pendingIntent);
      mBuilder.setSmallIcon(R.drawable.ic);
      mBuilder.setContentTitle("Content Title");
      mBuilder.setContentText("Content text");
      mBuilder.setPriority(Notification.PRIORITY_MAX);
      mBuilder.setStyle(bigText);
  
      NotificationManager mNotificationManager =
              (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
  
  
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
          NotificationChannel channel = new NotificationChannel("notify_001",
                  "Channel human readable title",
                  NotificationManager.IMPORTANCE_DEFAULT);
          mNotificationManager.createNotificationChannel(channel);
      }
  
      mNotificationManager.notify(0, mBuilder.build());
  
• Why does my launcher icon look different?

  See the image:

  

  Why does my icon look different to the other icons on the screen? In Android Studio, I set trim to zero and yet it still shows up like this on my phone. I have Nova Launcher installed which makes all my apps have rounded icons, but look at the Google Maps, and Instagram, how do I get my icon to fill the circle?
• How to implement the same Launcher icon on all Android Devices?

  Recently, I am implementing the adaptive launcher icon in my android application. I have successfully implemented it.

  I ran my application on some Gionee mobile( mostly i run my application on Stock Android) running on customized Android 6.0 like mi or Huawei. I found out that there is some kind of ugly mask the manufacturer has embedded in the customized Android which makes the App Icons ugly.

  So, I downloaded other apps and found out that other apps also have this ugly mask but apps like Google Tez, Google PlayStore, and many other Google apps are somehow defying this ugly mask thing making their icons like the original. How are they doing it?

  I thought by putting their launcher icons into mine could put an end to my misery and I will somehow get the insight of making the launcher icon more compatible.

  Here is the result of putting Tez icon in my resource file.

  

  As you can see there is that ugly mask in my icon on the left of google chrome and the right one is the original Tez app icon. How are they doing it?
• How to find points on a circle to define a ratio-based rectangle that maximizes the space?

  My question comes from the Android 8.0 Adaptive Icon requirements:

  https://developer.android.com/guide/practices/ui_guidelines/icon_design_adaptive

  I am working on an Android app where the launcher icon will be unknown and the people doing deployments of the app have no idea what SVG is (and no one will have the time, money, or patience to try to explain/understand what SVG is either). This means PNG images will be required to look good on Android 8.0 and later.

  An adaptive icon is shown at 108dp x 108dp. On xxxhdpi (4x), it works out to a total space of 432x432 pixels. However, only a 66dp diameter circle is used in the foreground, which is 264x264 pixels on xxxhdpi. The problem is that the icon is inside a circle mask. Explaining what a circle mask is and why it is required is also going to be extremely difficult. In short, images received will be rectangular and most people like to fill in available space.

  So what I want to do is take whatever rectangular input image I get and calculate its ratio (easy), but then find the rectangle of the same ratio that maximizes the space in a constrained circle with a diameter of 66dp. I could use an Euler's method approach by going from 0 to 90 degrees (i.e. guess) until I get "close enough" but a nice, easy to follow bit of code that doesn't use a for-loop that goes directly from a ratio to a precise rectangle would be much cleaner. I prefer C/C++-style but I'll take whatever I can get as long as it is readable. I'm quite rusty on my trigonometry - it's been almost 20 years since I last had to do any serious math so please no formulae in LaTeX without converting it to something I do understand (i.e. code) - I'm quite lost whenever I land on the math SE site these days.

  (If anyone thinks I'm looking for a handout, I'm perfectly fine with doing my own work as long as I know what to look for. I've got three unknowns: The angle, the length of the opposite, AND the length of the adjacent. Classic SOH-CAH-TOA doesn't directly apply. I've got two knowns: The length of the hypotenuse and a ratio of a rectangle. I can hack a solution together but I'd rather not if there's a cleaner solution.)