Monday 16 July 2018

Android working with and Recycler View And JSON PARSING API IMPLEMENT Process.

package xyz;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;

public class Json_Obect extends AppCompatActivity {
    private Context mContext;
    RecyclerView my_list;
    List_Adapter gridViewAdapter;

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

        mContext = Json_Obect.this;

        initiView();
        Get_CardApi();

    }

    private void initiView() {
        my_list = findViewById(R.id.my_list);
    }

    private void Get_CardApi() {

        String Url = "xyz";
        // showProgressDialog("Please wait...");        if (NetworkUtil.isNetworkAvailable(mContext)) {
            // POST parameters            Map<String, String> params = new HashMap<String, String>();

           /* params.put("dsaCode", dsa_number);            JSONObject jsonObj = new JSONObject(params);            // Request a json response from the provided URL            JsonObjectRequest jsonObjRequest = new JsonObjectRequest(Request.Method.POST, Url, jsonObj, new Response.Listener<JSONObject>() {*/
            // Request a json response from the provided URL            JsonObjectRequest jsonObjRequest = new JsonObjectRequest(Request.Method.GET, Url, new Response.Listener<JSONObject>() {
                @Override                public void onResponse(JSONObject response) {
                    Toast.makeText(getApplicationContext(), response.toString(), Toast.LENGTH_SHORT).show();

                    String msg = response.toString();
                    //  Utils.showToast(mContext, msg);                    JSONObject json = response;
                    System.out.println(response);
                    if (json.has("contacts")) {
                        try {
                            JSONArray data = json.getJSONArray("contacts");
                            HashMap<String, String> list = new HashMap<String, String>();
                            //removeProgressDialog();
                            if (data.length() > 0) {
                                gridViewAdapter = new List_Adapter(mContext, data);
                                RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
                                // RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), 2);                                my_list.setLayoutManager(mLayoutManager);
                                // my_list.setItemAnimator(new DefaultItemAnimator());                                my_list.setAdapter(gridViewAdapter);
                            } else {
                            }

                        } catch (JSONException e) {
                            e.printStackTrace();

                        }
                    }
                }
            },
                    new Response.ErrorListener() {
                        @Override                        public void onErrorResponse(VolleyError error) {
                            //removeProgressDialog();                            {
                                Toast.makeText(mContext, "Api Error, Please try again " + error.getMessage(), Toast.LENGTH_SHORT).show();

                            }
                        }

                    }) {
                @Override                public Map<String, String> getHeaders() throws AuthFailureError {
                    Map<String, String> params = new HashMap<String, String>();
                   /* String Token = new GetProfileDetails(mContext).getToken();                    String auth = "Bearer " + Token;                    params.put("Authorization", auth);*/                    return params;
                }
            };
            // Add the request to the RequestQueue.            RequestQueue requestQueue = Volley.newRequestQueue(this);
            requestQueue.add(jsonObjRequest);

        }
    }
}

package XYZ;

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.TextView;

import org.json.JSONArray;
import org.json.JSONException;

public class List_Adapter extends RecyclerView.Adapter<List_Adapter.MyViewHolder> {
    private JSONArray kyc_List;
    private Context mContext;

    public List_Adapter(Context mcontext, JSONArray kycList) {
        this.mContext = mcontext;
        this.kyc_List = kycList;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        TextView name, email, mobile;


        public MyViewHolder(final View v) {
            super(v);

            name = v.findViewById(R.id.name);
            email = v.findViewById(R.id.email);
            mobile = v.findViewById(R.id.mobile);

        }
    }

    @Override    public List_Adapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.listview, parent, false);

        return new List_Adapter.MyViewHolder(itemView);
    }

    @Override    public void onBindViewHolder(final List_Adapter.MyViewHolder holder, final int position) {
        try {
            final RecyclerView.ViewHolder holder1 = holder;
            kyc_List.getJSONObject(position);
            //String text_Name = kyc_List.getJSONObject(position).optString("name").toString();            String text_Email = kyc_List.getJSONObject(position).optString("email").toString();
            String text_Mobile = kyc_List.getJSONObject(position).optString("address").toString();

            holder.name.setText("Andrew PJ");
            holder.email.setText(text_Email);
            holder.mobile.setText(text_Mobile);

            //  holder.text_des.setText(kyc_List.getJSONObject(position).optString("descriptions").toString());
           /* if (!Imgurl.equals("") && Imgurl != null) {
                Utils.loadImage(holder.productIcon, Imgurl, mContext, R.drawable.ic_profile_img);            }*/

        } catch (JSONException e) {
            e.printStackTrace();

        }

    }


    @Override    public int getItemCount() {
        return kyc_List.length();
    }

}




package XYZ;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;


public class NetworkUtil {

    public static boolean isNetworkAvailable(Context context) {
        boolean value = false;


        ConnectivityManager manager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = manager.getActiveNetworkInfo();
        //       /* NetworkInfo networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        boolean isWifiConn = networkInfo.isConnected();        networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        boolean isMobileConn = networkInfo.isConnected();*/        //        if (info != null && info.isAvailable()) {
            value = true;
            Log.d("Is network available", String.valueOf(value));

        } else {
          

        }

        return value;
    }

}

Monday 11 July 2016

Android Intriew Question

(1) What is Android ?

Ans:- Android is an open-source, Linux-based operating system that is used in mobiles, tablets, televisions etc.

(2) Who is the founder of Android ?

Andy Rubin.

3) What are the code names of android?

1. Aestro 2. Blender 3. Cupcake 4. Donut 5. Éclair 6. Fro yo 7. Gingerbread 8. Honeycomb 9. Ice Cream Sandwich 10. Jelly Bean 11. Kitkat

(4) What are the advantages of android?

Ans:-Open-source: It means no licence, distribution and development fee. Platform-independent: It supports windows, mac and Linux platforms. Supports various technologies: It supports camera, bluetooth, wifi, speech, EDGE etc. technologies. Highly optimized Virtual Machine: Android uses highly optimized virtual machine for mobile devices, called DVM (Dalvik Virtual Machine).

(5) Does android support other language than java?

Ans:-Yes, android app can be developed in C/C++ also using android ND K (Native Development Kit). It makes the performance faster. It should be used with android SDK.

(6) What are the core building blocks of android?

Ans:-The core building blocks of android are: • Activity • View • Intent • Service • Content Provider • Fragment etc

.(7)What is Activity ?

Ans:-Activity is a single screen in supporting java code that is called a activity

(9) What is view in android ?

Ans:- A view is it the UI element such as button label tablet etc Anything that you see is a view.

(10)What is Intent ?

Ans:- Notification message to the user from android embed device can be display using intent that is called a intent. ?

(11)What is Service

Ans:-A service is a background process process that can run for a long time that is call a service .There are two types of services local and remote. Local service is accessed from within the application whereas remote service is accessed remotely from other applications running on the same device.

(10)What is Fragment ?

Ans: Ans-Fragment is a part of Activity by the help of fragment, we can display multiple screen on one activity that is call a fragment .

(12) What is Content Provider?

Ans:-Content Provider or used to share data between the applications, that is called a content Provider.

(13) What are the code names of android?

    Aestro
    Blender
    Cupcake
    Donut
    Eclair
    Froyo
    Gingerbread
    Honycomb
    Ice Cream Sandwitch
    Jelly Bean
    Kitkat
    Lollipop
    Marshmallow

(14) What is the name of database used in android?

Ans :-SQLite: An opensource and lightweight relational database for mobile devices.

15) What is AAPT?

AAPT is an acronym for android asset packaging tool. It handles the packaging process.
16) What is content provider?

Content providers are used to share information between android applications.

(17) What is fragment?

Fragment is a part of Activity. By the help of fragments, we can display multiple screens on one activity.

(18) What is ADB?

ADB stands for Android Debug Bridge. It is a command line tool that is used to communicate with the emulator instance.

(19) What is NDK?

NDK stands for Native Development Kit. By using NDK, you can develop a part of app using native language such as C/C++ to boost the performance.

20) What is ANR?
ANR stands for Application Not Responding. It is a dialog box that appears if the application is no longer responding.

(21) What is DDMS?

DDMS stands for Dalvik Debug Monitor Server. It gives the wide array of debugging features:

    Port forwarding services
    Screen capture
    Thread and heap information
    Network traffic tracking
    Location data spoofing

(22) Define Android Architecture?

Android architecture consists of 4 components:

    Linux Kernal
    Libraries
    Android Framework
    Android Applications

(23) What is a portable wi-fi hotspot?

The portable wi-fi hotspot is used to share internet connection to other wireless devices.

(24) Name the dialog box which are supported by android?

    Alert Dialog
    Progress Dialog
    Date Picker Dialog
    Time picker Dialog

(25) Name some exceptions in android?

    Inflate Exception
    Surface.OutOfResourceException
    SurfaceHolder.BadSurfaceTypeException
    WindowManager.BadTokenException

(26) What are the basic tools used to develop an android app?

    JDK
    Eclipse+ADT plugin
    SDK Tools

(27) What are the advantages of android?

Open-source: It means no licence, distribution and development fee.

Platform-independent: It supports windows, mac and linux platforms.

Supports various technologies: It supports camera, bluetooth, wifi, speech, EDGE etc. technologies.

Highly optimized Virtual Machine: Android uses highly optimized virtual machine for mobile devices, called DVM (Dalvik Virtual Machine).

(28) Does android support other language than java?

Yes, android app can be developed in C/C++ also using android NDK (Native Development Kit). It makes the performance faster. It should be used with android SDK.

(29) What are the core building blocks of android?

The core building blocks of android are:

    Activity
    View
    Intent
    Service
    Content Provider
    Fragment etc.

(30) What is activity?

Activity is like a frame or window in java that represents GUI. It represents one screen of android.

(31) What are the life cycle methods of android activity?

There are 7 life-cycle methods of activity. They are as follows:

    onCreate()
    onStart()
    onResume()
    onPause()
    onStop()
    onRestart()
    onDestroy()

(32) What is intent?

It is a kind of message or information that is passed to the components. It is used to launch an activity, display a web page, send sms, send email etc. There are two types of intents in android:

Implicit Intent
Explicit Intent

(33) What is implicit intent in android?

Implicit intent is used to invoke the system components.

(34) What is explicit intent in android?

Explicit intent is used to invoke the activity class.

(35) How to call another activity in android?

Intent i = new Intent(getApplicationContext(), ActivityTwo.class);
startActivity(i);

(36) What is the APK format?

The Android packaging key is compressed with classes,UI's, supportive assets and manifest.All files are compressed to a single file is called APK.

(37) What is An android manifest file?
Ans :- Android manifest .xml Application recource file and other file a project complie into a single activity file.

Saturday 17 October 2015

Activity LifeCycle in Android

Android Activity Life Cycle

An Activity is usually a single screen that the users sees on the device at a one time. Any application that has been developed by anyone it typically contains multiple activities.

* Most management of the life cycle is done automatically by the system via the activity Stack

* Activity manager is responsible for creating , destroying and managing activities.

For Example when the user starts an application for the first time, the activity manager will create

its activity and put it into the screen. later, when the user navigating to different screens . The activity manager will move to the previous activity to a holding place .This way if the user wants to go back to older activity , it can be started more quickly , older activities that the user has not used in a while will be destroyed in order to free more space fort the currently one .

In Activity Life Cycle we are having following methods:

1. onCreate()

2. onStart()

3. onRestart()

4. onResume()

5. onPause()

6. onStop()

7. onDestroy()

1. onCreate(); Called when the activity is first created. this is where you should do all of your normal static setup. create views bind data to lists etc, this method also provides you with a bundle containing the activities previous state.

2. onStart(): Called when the activity become visible to the user.

3. onRestart(); called after your activity has been stopped. prior to it being started again

4. onResume(); Called when the activity starts interacting with the user. At this point your activity is at the top of the stack.

5. onPause(): Called when the system is about to start resuming a previous activity. this is typically used to commit unsaved changes to persistent data, stop Animations and graphics that may be consuming CPU .

6. onStop(): Called when the activity is no longer visible to the user. and another activity has been resumed and is covering this one.

7. onDestroy(): Called when your finishing activity.

The activity first time loads the methods are called as bilow:

onCreate()

onStart()

onResume()

When try to click back button or finish the activity the following methods are called:

onPause()

onStop()

onDestroy()

When you click on home button the activity goes to background and below methods are called:

onPause()

onStop()

After hitting home button again if your opening the previous activity which is in background the following methods are called:

onRestart()

onStart()

onRestart()

Here i'm giving small example for how the acitivity life cycle is invoking all these life cycle methods are belongs to Activity class.

ScreenShots:

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="@string/hello_world" />

</RelativeLayout>

MainActivity.java:

package com.ram.activitylifecycle;

import android.app.Activity;

import android.os.Bundle;

import android.widget.Toast;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Toast.makeText(getApplicationContext(), "onCreate()", Toast.LENGTH_SHORT).show();

}

@Override

protected void onStart() {

Toast.makeText(getApplicationContext(), "onStart()", Toast.LENGTH_SHORT).show();

super.onStart();

}

@Override

protected void onResume() {