Samay Software Android 2018: August 2018

Friday, August 31, 2018

Async Task example Counter

package net.samaysoftware.listviewdemo;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class DemoThreading extends AppCompatActivity {

    TextView tvCounter;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo_threading);
        tvCounter = (TextView) findViewById(R.id.tvCounter);

        // call asynctask
        MyTask t = new MyTask();
        t.execute(10);


    }
    class MyTask extends AsyncTask<Integer, Integer, String>{

        @Override        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override        protected String doInBackground(Integer... arr) {
            int value = arr[0];
            for(int i =0; i<value;i++){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                publishProgress(i+1);
            }
            return "Done";
        }



        @Override        protected void onPostExecute(String s) {
            super.onPostExecute(s);


        }

        @Override        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            int v = values[0];
            tvCounter.setText(v+"");
        }
    }
}

jQuery basics

jQuery - lightweight, "write less, do more", JavaScript library

jQuery Core - jQuery UI - jQuery Mobile – QUnit - Sizzle

jQuery Features

Html/Dom Traversal & Manipulation

CSS Manipulation

Event Handling

Effects & Animations

AJAX

Install: head + script + src

Syntax: $(selector).action()

$ = access jQuery

Selector = a query to find HTML elements

Action = action to be performed on the selected elements

$(document).ready(function(){

});

SELECTORS

$(document).ready(function(){

$("p").hide();

$("#test").hide();

$(".test").hide();

});

jQuery EVENTS

Mouse Events	Keyboard Events	Form Events	Document/Window Events
click	keypress	submit	load
dblclick	keydown	change	resize
mouseenter / mouseleave	keyup	focus	scroll
mouseover / mouseout		blur	unload
mousedown / mouseup		select	ready
mousemove
hover

Click

$("#dv2 ").click(function(){

$(this).hide();
});

Hover

$("#p1").hover(

function(){alert("You entered p1!");},
function(){alert("Bye! You now leave p1!");}

);

jQuery Effects

HIDE/SHOW

$(selector).hide(speed, callback); //speed milliseconds (or “slow”, “fast”), callback function

$(selector).show(speed, callback);

$(selector).toggle(speed, callback);

FADE

$(selector). fadeIn (speed, callback);

$(selector). fadeOut (speed, callback);

$(selector). fadeToggle (speed, callback);

$(selector). fadeTo (speed, Opacity, callback);

SLIDE

$(selector). slideUp (speed, callback); - same as hide, just effect is different

$(selector). slideDown (speed, callback);

$(selector). slideToggle (speed, callback);

ANIMATE

$(selector).animate({params},speed,callback);

$(selector).stop(stopAll,goToEnd);

e.g. $(‘.button’).click(function(){

$(this).animate({‘width’:’200px’, ‘height’:’80px’}, 100, function(){ alert(‘done’) });

});

speed is optional, callback is optional

METHOD CHAINING

$("#p1"). slideUp(2000).slideDown(2000);

GET

$(selector).text(); //>> Text content

$(selector).html(); //>> HTML content

$(selector).val(); //>> Form Element

$(selector).attr(“href”);

SET

$(selector).text(“Hello”); //>> Text content

$(selector).html(“<div>Hello</div>”); //>> HTML content

$(selector).val(“Upanish”); //>> Form Element

$(selector).attr(“href”, “http://www.samaysoftware.net”);

ADD

$(selector).append(“</br>Last Line”); //>> append to content of the selected element

$(selector).prepend(“</br>First Line”);

$(selector).after(“<div>Last Line</div>”); //>> add this AFTER the selected element

$(selector).before(“</br>First Line”); //>> add this BEFORE the selected element

HEIRARCHY

$(“ul”).children().css(‘border-color’:’red’); -> Applies to all “li” which are within ul

$(“.p”).first().css(‘border-color’:’red’); -> Applies to 1^st element whose class is p, - last()

next() -> next element after selected element - prev()

parent() -> immediate parent of selected element

REMOVE

.remove() - .empty()

CSS

.addClass(“”) – .removeClass(“”) – .toggleClass(“”)

.css(“propertyname”) //>> Get Value

.css(“propertyname”, “value”) //>> Set Value

.css({"propertyname":"value","propertyname":"value",...});

DIMENSIONS

width() - height() - innerWidth() - innerHeight() - outerWidth() - outerHeight()

jQuery AJAX

$("button").click(function(){

$("#div1").load("demo_test.txt",function(responseTxt, statusTxt, xhr){

if(statusTxt=="success")

alert("External content loaded successfully!");
if(statusTxt=="error")

alert("Error: "+xhr.status+": "+xhr.statusText);

});

$("button").click(function(){

$.get("demo_test.asp",function(data,status){

alert("Data: " + data + "\nStatus: " + status);

});

$("button").click(function(){

$.post("demo_test_post.asp",

{

name:"Donald Duck",
city:"Duckburg

function(data,status){

alert("Data: " + data + "\nStatus: " + status);
});

});

Web Connectivity from Android

You need 2 reference files for connecting to any webserver

HttpManager.java

RequestPackage.java

Download the above mentioned files and paste them in Android Studio

Tuesday, August 28, 2018

File Manager Code

package net.samaysoftware.sampleapplication12345;

import android.content.Intent;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
public class FMMainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    ListView lv;
    String[] from = {"fname","ftype"};
    int[] to = {android.R.id.text1, android.R.id.text2};
    ArrayList<HashMap<String, String>> data = new ArrayList<>();
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fmmain);
        lv = (ListView) findViewById(R.id.fmlv);
        generateData();
        SimpleAdapter sa = new SimpleAdapter(this, data, android.R.layout.simple_list_item_2,from, to);
        lv.setAdapter(sa);
        lv.setOnItemClickListener(this);
    }
    private void generateData() {
        File froot = null;
        if(getIntent().getStringExtra("abcd")==null) {
            froot = Environment.getExternalStorageDirectory();
        }
        else{
            String fpath = getIntent().getStringExtra("abcd");
            froot = new File(fpath);
            setTitle(froot.getName());
        }
        File[] arr = froot.listFiles();
        for(File f: arr){
            String name = f.getName();
            String type = f.isFile()?"File":"Folder";
            HashMap<String, String> map = new HashMap<>();
            map.put("fname", name);
            map.put("ftype", type);
            map.put("fpath", f.getAbsolutePath());
            data.add(map);
        }
    }

    @Override    public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
        String fpath = data.get(pos).get("fpath");
        File cf = new File(fpath);
        if(cf.isDirectory()){
            Intent i = new Intent(this, FMMainActivity.class);
            i.putExtra("abcd", fpath);
            startActivity(i);
        }else{

        }

    }
}

Note: Add permission in Manifest file as below:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
just before the <application> tag and inside the <manifest> tag.

Saturday, August 11, 2018

Static ListView with SimpleAdapter

package net.samaysoftware.listviewdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.*;

import java.util.ArrayList;
import java.util.HashMap;

public class AnotherListViewActivity extends AppCompatActivity {

    ListView lvAnother;
    String[] from = {"a","b"};
    int[] to = {R.id.tvState, R.id.tvCapital};
    ArrayList<HashMap<String, String>> data = new ArrayList<>();

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_another_list_view);
        lvAnother = (ListView) findViewById(R.id.lvanother);

        prepareData();
        SimpleAdapter sa = new SimpleAdapter(this, data, R.layout.repeating_unit_2_items,from, to);
        lvAnother.setAdapter(sa);


    }

    private void prepareData() {
        HashMap<String, String> map1 = new HashMap<>();
        map1.put("a", "Gujarat");
        map1.put("b", "Gandhinagar");

        HashMap<String, String> map2 = new HashMap<>();
        map2.put("a", "Rajasthan");
        map2.put("b", "Jaipur");

        HashMap<String, String> map3 = new HashMap<>();
        map3.put("a", "Maharasthra");
        map3.put("b", "Mumbai");

        HashMap<String, String> map4 = new HashMap<>();
        map4.put("a", "Madhyapradesh");
        map4.put("b", "Bhopal");

        data.add(map1);
        data.add(map2);
        data.add(map3);
        data.add(map4);


    }
}

ListView with ArrayAdapter (Dynamic)

package net.samaysoftware.listviewdemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

import java.util.ArrayList;

public class CityListActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, View.OnClickListener {

    ListView lvCities;
    ArrayList<String> arr = new ArrayList<>();
    EditText etCityName;
    Button btnSave;
    ArrayAdapter<String> aa;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findAllViews();
        aa = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,android.R.id.text1,arr);
        lvCities.setAdapter(aa);
        lvCities.setOnItemClickListener(this);
        btnSave.setOnClickListener(this);
    }

    private void findAllViews() {
        lvCities = (ListView) findViewById(R.id.lvCities);
        etCityName = (EditText) findViewById(R.id.etCityName);
        btnSave = (Button)findViewById(R.id.btnSave);
    }

    @Override    public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
        String selectedcity = arr.get(pos);
        Toast.makeText(this, "You clicked on position: "+selectedcity, Toast.LENGTH_SHORT).show();

        Intent i = new Intent(this, CityDetailActivity.class);
        i.putExtra("abcd",selectedcity);
        startActivity(i);
    }

    @Override    public void onClick(View view) {
        String name = etCityName.getText().toString();
        arr.add(name);
        aa.notifyDataSetChanged();
    }
}

Wednesday, August 1, 2018

Calculator

package net.samaysoftware.sampleproject12345;

import android.renderscript.Double2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btnplus, btnminus, btnmult, btndiv, btneq, btndot;
    TextView tvScreen;
    Button[] arr= null;


    double num1;
    int op;

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

        findAllViews();
        arr = new Button[]{btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btnplus, btnminus, btnmult, btndiv, btneq, btndot};
        for(int i = 0; i<arr.length;i++){
            arr[i].setOnClickListener(this);
        }

    }

    private void findAllViews() {
        btn0 = (Button) findViewById(R.id.btn0);
        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);
        btn3 = (Button) findViewById(R.id.btn3);
        btn4 = (Button) findViewById(R.id.btn4);
        btn5 = (Button) findViewById(R.id.btn5);
        btn6 = (Button) findViewById(R.id.btn6);
        btn7 = (Button) findViewById(R.id.btn7);
        btn8 = (Button) findViewById(R.id.btn8);
        btn9 = (Button) findViewById(R.id.btn9);
        btndot = (Button) findViewById(R.id.btndot);
        btnplus = (Button) findViewById(R.id.btnplus);
        btnminus = (Button) findViewById(R.id.btnminus);
        btnmult = (Button) findViewById(R.id.btnmult);
        btndiv = (Button) findViewById(R.id.btndiv);
        btneq = (Button) findViewById(R.id.btneq);
        tvScreen = (TextView) findViewById(R.id.tvScreen);
    }

    @Override    public void onClick(View view) {
        Button clickedbutton = (Button) view;

        if(view== btn0 || view== btn1 || view== btn2 || view== btn3 || view== btn4 || view== btn5 || view== btn7 || view== btn6 || view== btn8 || view== btn9 || view== btndot ){
            String oldvalue = tvScreen.getText().toString();

            if(view==btndot && oldvalue.contains(".")){
                return;
            }
            String newvalue = oldvalue + clickedbutton.getText();
            tvScreen.setText(newvalue);

        }
        else if(view== btnplus || view== btnminus || view== btnmult || view== btndiv ){
            String oldvalue = tvScreen.getText().toString();
            num1 = Double.parseDouble(oldvalue);
            if(view==btnplus){
                op=1;
            }

            if(view==btnminus){
                op=2;
            }
            if(view==btnmult){
                op=3;
            }
            if(view==btndiv){
                op=4;
            }
            tvScreen.setText("");

        }
        else if(view == btneq){
            double num2 = Double.parseDouble(tvScreen.getText().toString());
            double ans = 0;
            switch (op){
                case 1:
                    ans = num1 + num2;
                    break;
                case 2:
                    ans = num1-num2;
                    break;
                case 3:
                    ans = num1 * num2;
                    break;
                case 4:
                    ans = num1 / num2;
                    break;
            }
            tvScreen.setText(ans+"");



        }
    }
}

Samay Software Android 2018

Pages

Friday, August 31, 2018

Async Task example Counter

jQuery basics

Web Connectivity from Android

Tuesday, August 28, 2018

File Manager Code

Saturday, August 11, 2018

Static ListView with SimpleAdapter

ListView with ArrayAdapter (Dynamic)

Wednesday, August 1, 2018

Calculator

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