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Category Archives: Mobile Development

Mobile Development

Compile-time Error: control may reach end of non-void function with Xcode 10.2

Copy from: https://github.com/realm/realm-js/issues/2305

 

temp solution :

add default: return "null"; between line 52 and 53,

template<>
inline const char *jsc::Value::typeof(JSContextRef ctx, const JSValueRef &value) {
    switch (JSValueGetType(ctx, value)) {
        case kJSTypeNull: return "null";
        case kJSTypeNumber: return "number";
        case kJSTypeObject: return "object";
        case kJSTypeString: return "string";
        case kJSTypeBoolean: return "boolean";
        case kJSTypeUndefined: return "undefined";
        default: return "null";
    }
    
}

this working for me, waiting for the official solution

 
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Posted by on April 11, 2019 in iOS, Mobile Development, React Native

 

Android – Launcher Icon Size

By:

 

683

I would create separate images for each one:

LDPI should be 36 x 36.

MDPI should be 48 x 48.

TVDPI should be 64 x 64.

HDPI should be 72 x 72.

XHDPI should be 96 x 96.

XXHDPI should be 144 x 144.

XXXHDPI should be 192 x 192.

Then just put each of them in the separate stalks of the drawable folder.

You are also required to give a large version of your icon when uploading your app onto the Google Play Store and this should be WEB 512 x 512. This is so large so that Google can rescale it to any size in order to advertise your app throughout the Google Play Store and not add pixelation to your logo.

Basically, all of the other icons should be in proportion to the ‘baseline’ icon, MDPI at 48 x 48.

LDPI is MDPI x 0.75.

TVDPI is MDPI x 1.33.

HDPI is MDPI x 1.5.

XHDPI is MDPI x 2.

XXHDPI is MDPI x 3.

XXXHDPI is MDPI x 4.

This is all explained on the Iconography page of the Android Developers website:http://developer.android.com/design/style/iconography.html

copy from: https://stackoverflow.com/questions/12768128/android-launcher-icon-size

 
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Posted by on February 2, 2019 in Android, Mobile Development

 

Change package name for Android in React Native

By:Cherniv

Then manually switched the old and new package ids:

In: android/app/src/main/java/MY/APP/NEW_ID/MainActivity.java:

package MY.APP.NEW_ID;

In android/app/src/main/java/MY/APP/NEW_ID/MainApplication.java:

package MY.APP.NEW_ID;

In android/app/src/main/AndroidManifest.xml:

package="MY.APP.NEW_ID"

And in android/app/build.gradle:

applicationId "MY.APP.NEW_ID"

(Optional) In android/app/BUCK:

android_build_config(
  package="MY.APP.NEW_ID"
)
android_resource(
  package="MY.APP.NEW_ID"
)

Gradle’ cleaning in the end (in /android folder):

./gradlew clean

 

Copy from: https://stackoverflow.com/questions/37389905/change-package-name-for-android-in-react-native

 
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Posted by on January 25, 2019 in Mobile Development, React Native

 

Obfuscating Android Code with Proguard

By:

First enable minifyEnabled in your build.gradle file, like

minifyEnabled true

After this, add below lines in progurad-rules.txt file

-keep class yourpackage.** { *; }
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose

For checking that its working fine go to:

http://www.javadecompilers.com/apktool website so that you can verify after decompilation.

It will work and your classes will be hidden completely.

Copyfrom: https://stackoverflow.com/questions/17290023/obfuscation-in-android-studio

http://medium/@rakawestu/obfuscating-android-code-with-proguard-d43234df9785

 
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Posted by on April 5, 2018 in Android, Mobile Development

 

Horizontal RecyclerView in Vertical RecyclerView like Google Play Store

By: 

Step: 1
======
Create two Model Classes like below.

SingleItemModel.java

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package com.pratap.gplaystore.models;

/**
 * Created by pratap.kesaboyina on 01-12-2015.
 */
public class SingleItemModel {


    private String name;
    private String url;
    private String description;


    public SingleItemModel() {
    }

    public SingleItemModel(String name, String url) {
        this.name = name;
        this.url = url;
    }


    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }


}

SectionDataModel.java

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package com.pratap.gplaystore.models;

import java.util.ArrayList;

/**
 * Created by pratap.kesaboyina on 30-11-2015.
 */
public class SectionDataModel {



    private String headerTitle;
    private ArrayList<SingleItemModel> allItemsInSection;


    public SectionDataModel() {

    }
    public SectionDataModel(String headerTitle, ArrayList<SingleItemModel> allItemsInSection) {
        this.headerTitle = headerTitle;
        this.allItemsInSection = allItemsInSection;
    }



    public String getHeaderTitle() {
        return headerTitle;
    }

    public void setHeaderTitle(String headerTitle) {
        this.headerTitle = headerTitle;
    }

    public ArrayList<SingleItemModel> getAllItemsInSection() {
        return allItemsInSection;
    }

    public void setAllItemsInSection(ArrayList<SingleItemModel> allItemsInSection) {
        this.allItemsInSection = allItemsInSection;
    }


}

Step: 2
======
Create an Activity with RecyclerView to show the list in vertical order.

MainActivity.java

 

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package com.pratap.gplaystore;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;

import com.pratap.gplaystore.adapters.RecyclerViewDataAdapter;
import com.pratap.gplaystore.models.SectionDataModel;
import com.pratap.gplaystore.models.SingleItemModel;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;


    ArrayList<SectionDataModel> allSampleData;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar = (Toolbar) findViewById(R.id.toolbar);

        allSampleData = new ArrayList<SectionDataModel>();

        if (toolbar != null) {
            setSupportActionBar(toolbar);
            toolbar.setTitle("G PlayStore");

        }


        createDummyData();


        RecyclerView my_recycler_view = (RecyclerView) findViewById(R.id.my_recycler_view);

        my_recycler_view.setHasFixedSize(true);

        RecyclerViewDataAdapter adapter = new RecyclerViewDataAdapter(this, allSampleData);

        my_recycler_view.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

        my_recycler_view.setAdapter(adapter);


    }

    public void createDummyData() {
        for (int i = 1; i <= 5; i++) {

            SectionDataModel dm = new SectionDataModel();

            dm.setHeaderTitle("Section " + i);

            ArrayList<SingleItemModel> singleItem = new ArrayList<SingleItemModel>();
            for (int j = 0; j <= 5; j++) {
                singleItem.add(new SingleItemModel("Item " + j, "URL " + j));
            }

            dm.setAllItemsInSection(singleItem);

            allSampleData.add(dm);

        }
    }
}

Create an XML Layout for the above activity class

activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="8dp"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />


    <android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none" />


</LinearLayout>

Step: 3
======
Now Create an Adapter Class for the recyclerView in the MainActivity.


RecyclerViewDataAdapter.java

 

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package com.pratap.gplaystore.adapters;

/**
 * Created by pratap.kesaboyina on 24-12-2014.
 */
import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.pratap.gplaystore.R;
import com.pratap.gplaystore.models.SectionDataModel;

import java.util.ArrayList;

public class RecyclerViewDataAdapter extends RecyclerView.Adapter<RecyclerViewDataAdapter.ItemRowHolder> {

    private ArrayList<SectionDataModel> dataList;
    private Context mContext;

    public RecyclerViewDataAdapter(Context context, ArrayList<SectionDataModel> dataList) {
        this.dataList = dataList;
        this.mContext = context;
    }

    @Override
    public ItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);
        ItemRowHolder mh = new ItemRowHolder(v);
        return mh;
    }

    @Override
    public void onBindViewHolder(ItemRowHolder itemRowHolder, int i) {

        final String sectionName = dataList.get(i).getHeaderTitle();

        ArrayList singleSectionItems = dataList.get(i).getAllItemsInSection();

        itemRowHolder.itemTitle.setText(sectionName);

        SectionListDataAdapter itemListDataAdapter = new SectionListDataAdapter(mContext, singleSectionItems);

        itemRowHolder.recycler_view_list.setHasFixedSize(true);
        itemRowHolder.recycler_view_list.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
        itemRowHolder.recycler_view_list.setAdapter(itemListDataAdapter);


        itemRowHolder.btnMore.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                Toast.makeText(v.getContext(), "click event on more, "+sectionName , Toast.LENGTH_SHORT).show();



            }
        });


       /* Glide.with(mContext)
                .load(feedItem.getImageURL())
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .centerCrop()
                .error(R.drawable.bg)
                .into(feedListRowHolder.thumbView);*/
    }

    @Override
    public int getItemCount() {
        return (null != dataList ? dataList.size() : 0);
    }

    public class ItemRowHolder extends RecyclerView.ViewHolder {

        protected TextView itemTitle;

        protected RecyclerView recycler_view_list;

        protected Button btnMore;



        public ItemRowHolder(View view) {
            super(view);

            this.itemTitle = (TextView) view.findViewById(R.id.itemTitle);
            this.recycler_view_list = (RecyclerView) view.findViewById(R.id.recycler_view_list);
            this.btnMore= (Button) view.findViewById(R.id.btnMore);


        }

    }

}

Now create an xml Layout file for the above adapter class.

list_item.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:background="?android:selectableItemBackground"
    android:orientation="vertical"
    android:padding="5dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="2dp">


        <TextView
            android:id="@+id/itemTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_centerVertical="true"
            android:layout_gravity="center_vertical"
            android:layout_toLeftOf="@+id/btnMore"
            android:text="Sample title"
            android:textColor="@android:color/black"
            android:textSize="18sp" />

        <Button
            android:id="@+id/btnMore"
            android:layout_width="wrap_content"
            android:layout_height="42dp"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:theme="@style/MyButton"
            android:text="more"
            android:textColor="#FFF" />


    </RelativeLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view_list"
        android:layout_width="match_parent"
        android:layout_height="160dp"
        android:layout_gravity="center_vertical"
        android:orientation="horizontal" />


</LinearLayout>

Step: 4
======

Now , In order to make a horizontal RecyclerView , we need create a layout and Adapter class for each row.

list_single_card.xml

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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    app:cardCornerRadius="5dp"
    app:cardUseCompatPadding="true"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="0dp"
        android:background="?android:selectableItemBackground"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/itemImage"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_gravity="center_horizontal"
            android:scaleType="fitCenter"
            android:src="@drawable/android" />


        <TextView
            android:id="@+id/tvTitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/itemImage"
            android:gravity="center"
            android:padding="5dp"
            android:text="Sample title"
            android:textColor="@android:color/black"
            android:textSize="18sp" />


    </LinearLayout>

</android.support.v7.widget.CardView>

 


The Adapter Class for Horizontal RecyclerView


SectionListDataAdapter.java

 

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package com.pratap.gplaystore.adapters;

/**
 * Created by pratap.kesaboyina on 24-12-2014.
 */

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.pratap.gplaystore.R;
import com.pratap.gplaystore.models.SingleItemModel;

import java.util.ArrayList;

public class SectionListDataAdapter extends RecyclerView.Adapter<SectionListDataAdapter.SingleItemRowHolder> {

    private ArrayList<SingleItemModel> itemsList;
    private Context mContext;

    public SectionListDataAdapter(Context context, ArrayList<SingleItemModel> itemsList) {
        this.itemsList = itemsList;
        this.mContext = context;
    }

    @Override
    public SingleItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_single_card, null);
        SingleItemRowHolder mh = new SingleItemRowHolder(v);
        return mh;
    }

    @Override
    public void onBindViewHolder(SingleItemRowHolder holder, int i) {

        SingleItemModel singleItem = itemsList.get(i);

        holder.tvTitle.setText(singleItem.getName());


       /* Glide.with(mContext)
                .load(feedItem.getImageURL())
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .centerCrop()
                .error(R.drawable.bg)
                .into(feedListRowHolder.thumbView);*/
    }

    @Override
    public int getItemCount() {
        return (null != itemsList ? itemsList.size() : 0);
    }

    public class SingleItemRowHolder extends RecyclerView.ViewHolder {

        protected TextView tvTitle;

        protected ImageView itemImage;


        public SingleItemRowHolder(View view) {
            super(view);

            this.tvTitle = (TextView) view.findViewById(R.id.tvTitle);
            this.itemImage = (ImageView) view.findViewById(R.id.itemImage);


            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {


                    Toast.makeText(v.getContext(), tvTitle.getText(), Toast.LENGTH_SHORT).show();

                }
            });


        }

    }

}

ScreenShots
=========

Source code
========
DropBox Link

Demo
========

Copy from: http://android-pratap.blogspot.com/2015/12/horizontal-recyclerview-in-vertical.html

 
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Posted by on February 8, 2018 in Android, Mobile Development

 

Android Push Notifications when app is closed

By: Charuක

 

Yes, it is possible ‘to receive notifications from google cloud message when the application is fully closed’.

Infact, A broadcast receiver is the mechanism GCM uses to deliver messages. You need to have implement a BroadcastReceiver and declare it in the AndroidManifest.xml.

Please refer to the following code snippet.

AndroidManifest.xml

<receiver
    android:name=".GcmBroadcastReceiver"
    android:permission="com.google.android.c2dm.permission.SEND" >
    <intent-filter>
        <!-- Receives the actual messages. -->
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        <category android:name="com.google.android.gcm.demo.app" />
    </intent-filter>
</receiver>
<service android:name=".GcmIntentService" />

Java code

public class GcmBroadcastReceiver extends WakefulBroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // Explicitly specify that GcmIntentService will handle the intent.
        ComponentName comp = new ComponentName(context.getPackageName(),
                GcmIntentService.class.getName());
        // Start the service, keeping the device awake while it is launching.
        startWakefulService(context, (intent.setComponent(comp)));
        setResultCode(Activity.RESULT_OK);
    }
}

When GCM delivers a message to your device, BroadcastReceiver will receive the message and call the onReceive() function, wherein you may start a service to actually perform the intended task for you.

The above Code example uses a specialized BroadcastReceiver called WakefulBroadcastReceiver, which makes sure that the device doesn’t go to sleep, while the service is doing its work.

Refer to the Official Android Page for the same: https://developer.android.com/google/gcm/client.html

 

 

 

Copy from: https://stackoverflow.com/questions/24313539/push-notifications-when-app-is-closed

 
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Posted by on September 15, 2017 in Android, Mobile Development

 

Adding Badge count on menu items like cart , notification etc

By: mobikul.com

In every application, we decorate our MenuItem placed on ActionBar. Displaying of badge count not only decorate the ActionBar beautifully but also displays useful information like showing the number of items currently available in your cart or update you with unread notification.

We can create badge count using either a custom view or by adding a distinct drawable to display the each state of MenuItem.

Both the options have its pros and cons.

There is another approach using LayerDrawable which is more flexible and efficient than the former approaches.

Here’s what we’re going to do:

  1. Create a LayerDrawable to display MenuItem with a badge.
  2. Create a custom drawable let us called BadgeDrawable.
  3. Set badge on the menu item from our Activity.

LayerDrawable

A Drawable that manages an array of other Drawables. These are drawn in array order, so the element with the largest index will be drawn on top.It can be defined in an XML file with the

It can be defined in an XML file with the <layer-list> element. Each Drawable in the layer is defined in a nested<item>

i. Creating a layer drawable to display menu item on layer one and badge on top of it.

ic_menu_cart.xml

ii. Creating menu for our activity to display the count on the menu items.

main.xml

iii. Creating a flexible and efficient custom BagdeDrawable class to draw a view that looks like a count

BagdeDrawable.java

 

Setting up altogether

We can get the icon of the menu using getIcon() method.

Here is our method setBadgeCount(). We can pass LayerDrawable which we get from meniItem and setBadge from anywhere from the application.

Sample source code

 

Copy from: https://mobikul.com/adding-badge-count-on-menu-items-like-cart-notification-etc/

 

 

 
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Posted by on June 7, 2017 in Android, Mobile Development