Animated app(Launcher) icon

2018-04-17 06:09 Ankit Kumar imported from Stackoverflow

I need to implement animated app(launcher) icon like facebook, instagram, whatsapp etc in android .

My target version is 26

minSdkVersion 15
targetSdkVersion 26

ic_launcher.xml

<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
<background android:drawable="@color/ic_app_background"/>
<foreground android:drawable="@mipmap/ic_app_foreground"/>
</adaptive-icon>

If anybody know please help me to do the same.

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Recyclerview returning Null

I had a listview for displaying a list of messages and i changed it to recyclerview for better readability and UI and its returning a nullpointerexception... can any1 help me out on why its reyurning null

Activity

 RecyclerView messageList;
List<Messages> messagesList = new ArrayList<>();
private LinearLayoutManager linearLayoutManager;
private MessageAdapter mAdapter;

mAdapter = new MessageAdapter(messagesList);
    messageList = (RecyclerView) findViewById(R.id.messageList);
    linearLayoutManager = new LinearLayoutManager(this);
    messageList.setHasFixedSize(true);
    messageList.setLayoutManager(linearLayoutManager);
    messageList.setAdapter(mAdapter);

 private void fetchMessages() {

   rootRef.child("Messages").child(MessageSenderId).child(MessageRecieverId).addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            Messages message = dataSnapshot.getValue(Messages.class);
            messagesList.add(message);
            mAdapter.notifyDataSetChanged();
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Messages Class

public class Messages {
private String from;
private String message;
private String type;
private boolean seen;
private long time;

public Messages(){};

public String getFrom() {
    return from;
}

public void setFrom(String from) {
    this.from = from;
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message;
}

public String getType() {
    return type;
}

public void setType(String type) {
    this.type = type;
}

public boolean isSeen() {
    return seen;
}

public void setSeen(boolean seen) {
    this.seen = seen;
}

public long getTime() {
    return time;
}

public void setTime(long time) {
    this.time = time;
}

}

Adapter

public class MessageAdapter extends RecyclerView.Adapter<MessageAdapter.MessageViewHolder>{
private List<Messages> userMessageList;
private FirebaseAuth mAuth;

public MessageAdapter (List<Messages>userMessageList)

{
    this.userMessageList = userMessageList;
}

public class MessageViewHolder extends RecyclerView.ViewHolder{
    public TextView messageText;
    public MessageViewHolder(View view)
    {
        super(view);
        messageText = (TextView)view.findViewById(R.id.message_text);
    }
}

@Override
public  int getItemCount()
{
    return userMessageList.size();
}
@Override
public MessageViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
    View V = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_chat_custom,parent,false);
    mAuth = FirebaseAuth.getInstance();
    return new MessageViewHolder(V);
}

@SuppressLint("ResourceType")
@Override
public void onBindViewHolder(MessageViewHolder holder, int position) {

        String current_user_id = mAuth.getInstance().getCurrentUser().getUid();
        Messages messages = userMessageList.get(position);
        String from_user = messages.getFrom();

//        Log.d("TAG",current_user_id + "/" + from_user);

        if (from_user.equals(current_user_id)){
            holder.messageText.setBackgroundResource(Color.BLUE);
            holder.messageText.setTextColor(Color.RED);
        }else {
            holder.messageText.setBackgroundResource(R.drawable.text_background1);
            holder.messageText.setTextColor(Color.CYAN);
        }

        holder.messageText.setText(messages.getMessage());
    }
}

Im getting an error in the line if (from_user.equals(current_user_id)){

The error

 FATAL EXCEPTION: main
                                             Process: com.appmaster.akash.messageplus, PID: 1135
                                             java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
                                                 at com.appmaster.akash.messageplus.MessageAdapter.onBindViewHolder(MessageAdapter.java:59)
                                                 at com.appmaster.akash.messageplus.MessageAdapter.onBindViewHolder(MessageAdapter.java:19)
                                                 at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6482)
                                                 at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6515)
                                                 at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5458)
                                                 at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5724)
                                                 at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5563)
                                                 at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5559)
                                                 at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2229)
                                                 at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1556)
                                                 at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1516)
                                                 at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:608)
                                                 at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693)
                                                 at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3410)
                                                 at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3962)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1080)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                 at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
                                                 at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
                                                 at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                 at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
                                                 at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
                                                 at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
                                                 at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
                                                 at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
                                                 at android.view.View.layout(View.java:16669)
                                                 at android.view.ViewGroup.layout(ViewGroup.java:5440)
                                                 at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2207)
                                                 at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1963)
                                                 at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
                                                 at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6064)
                                                 at android.view.Choreographer$CallbackRecord.run(Choreographer.java:860)
                                                 at android.view.Choreographer.doCallbacks(Choreographer.java:672)
                                                 at android.view.Choreographer.doFrame(Choreographer.java:608)
                                                 at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:846)
                                                 at android.os.Handler.handleCallback(Handler.java:742)
                                                 at android.os.Handler.dispatchMessage(Handler.java:95)
                                                 at android.os.Looper.loop(Looper.java:157)
                                                at android.app.ActivityThread.main(ActivityThread.java:5

Someone please help me out.... sorry if its too much code but for finding out what the error is this much code is required... if you need more details please ask... and also it was working perfectly fine before when i was using listview so its not because of the logic or database

Android: Retrieve data of a specific user from a Firebase database
I am trying to read "specific" data from my firebase realtime database. I have seen examples of getting all data from a table and going through it to find the data record you want, but that is definitly not a recommended safe practice.

Below is how I save my data
```
private void saveInDatabase(String email)
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Well that works great. But now I need to retrieve the data record from the user table, that is only belong to John. If I do this with MySQL, it will be smething like select * from user where primaryKey =JOHN_PRYMARY_KEY

I gave it a try, check below.
```
database.getReference("user" + FirebaseAuth.getInstance().getCurrentUser().getUid());
```
I am really not sure how I can proceed from here, I see no method to go forward. Please advice.
Android fragments memory leaking
I am currently developing an Android application using fragments and i am encountering a memory leak that forces my app to close after a while.

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And this code behind to animate the Image:

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Why animation does not work?

All code

import React, { Component } from 'react';
import {
    AppRegistry,
    View,
    Image,
    StyleSheet,
    WebView,
    Linking,
    TouchableOpacity,
    Animated,
    Keyboard, 
    TextInput,
    KeyboardAvoidingView
} from 'react-native';

import {
    Button,
    Text,
    Container,
    Card,
    CardItem,
    Body,
    Content,
    Header,
    Title,
    Left,
    Icon,
    Right,
    Form,
    Picker,
    Item
} from 'native-base';

import { Actions } from 'react-native-router-flux';
import { styles, colors, paddings, fonts } from '../styles';
import DefaultInput from "./DefaultInput";
import validate from "./Validation";
import ModalComponent from "./Modal";
import ModalDropdown from 'react-native-modal-dropdown';
import { LinearGradient } from 'expo';
import CheckBox from 'react-native-check-box';

class CheckIn extends Component {
constructor(props) {
    super(props);  
    this.inputMarginTop = new Animated.Value(8);

}

componentWillMount () {
    this.keyboardWillShowSub = Keyboard.addListener('keyboardWillShow', this.keyboardWillShow);
    this.keyboardWillHideSub = Keyboard.addListener('keyboardWillHide', this.keyboardWillHide);
  }

  componentWillUnmount() {
    this.keyboardWillShowSub.remove();
    this.keyboardWillHideSub.remove();
  }


 keyboardWillShow = (event) => {
    Animated.timing(this.inputMarginTop, {
      duration: event.duration,
      toValue: 2,
    }).start();
  };

  keyboardWillHide = (event) => {
    Animated.timing(this.inputMarginTop, {
      duration: event.duration,
      toValue: 8,
    }).start();
  };


    render() {
       console.log(this.inputMarginTop._value);
        return (
                  <View style={{height: '100%', alignItems: 'center', flexDirection: 'column'}}>
                          <TextInput
                            style={{width: '90%', height: 20, borderWidth:1, marginTop: 100}}
                          />
                          <View style={{width: '90%'}}>
                              <Animated.Text style={{marginLeft: 10, marginBottom: 8, marginTop: `${this.inputMarginTop}%`}}>Имя</Animated.Text>
                           </View>
                    </View>
        );
    }
}
export default CheckIn;

Important parts of the code

this.inputMarginTop = new Animated.Value(8);

<View style={{width: '90%'}}>
   <Animated.Text style={{marginLeft: 10, marginBottom: 8, marginTop: `${this.inputMarginTop}%`}}>Имя</Animated.Text>
</View>

Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work? Why animation does not work?

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From Apple Documents pausesoncompletion

Because the completion handler is not called when this property is true, you cannot use the animator's completion handler to determine when the animations have finished running. Instead, you determine when the animation has ended by observing the isRunning property.

But i found observe isRunning not work. util i wathched WWDC 2017 - Session 230-Advanced Animations with UIKit ,i konwed i should observe running
```
//not work
animator.addObserver(self, forKeyPath: "isRunning", options: [.new], context: nil)
//this work
animator.addObserver(self, forKeyPath: "running", options: [.new], context: nil)
```
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Smart Animated Icons is one of the Highlighted Features of MIUI 9.You can see the New Animation when you Launch and Exit Apps. Open/Launch the App and You can notice the Animation on its Icon when you exit the App. Animation seems to be cool and it gives you a live Experience as if Icons are Live. Take a look at the below GIFs to see the Animation on Icons.

Facebook Smart Icon animation exmaple.

Settings app Smart Icon animation

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This worked on api 26, but broke icons on android versions lower than that, they now show default android image. I managed to fix this by renaming my folder to mipmap-anydpi-v26, now icons work as expected on all supported apis.

My question is this, are we supposed to do it like this? Will -v26 make it also work on api 27+ or I have to create separate -v2X folder for each future api?

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Animated app(Launcher) icon

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