Android

Re: New beginer to android

4-Jun-16 16:01

Could be any of a hundred different reasons. Good luck.

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New beginer to android

hmanhha3-Jun-16 6:51

hmanhha

3-Jun-16 6:51

HI all.I am new beginer to android.I Want to write an android app.
WHat do I Need now.I Have read some books but may be it is out of date so I ask here.

First I need to install Java JDK to my PC.
Second I need Android Studio.

Is that all now???

THanks.

David Crow3-Jun-16 10:28

Re: New beginer to android

3-Jun-16 10:28

hmanhha wrote:

First I need to install Java JDK to my PC.
Second I need Android Studio.

Both of which can be done from here.

Richard MacCutchan3-Jun-16 22:43

Re: New beginer to android

3-Jun-16 22:43

Some excellent tutorials for beginners at http://www.codeproject.com/KB/android/#Android+Tutorial+Contest[^], including some that explain how to install and configure Android Studio.

AkhilSreekar19-Jun-16 9:41

AkhilSreekar

19-Jun-16 9:41

Yes.After installing android studio, you need to install the required sdk pacakages for which version you want your android app to run.

how to retrieve or get next item from json file when press click button listner

ahmed_sa3-Jun-16 3:05

Re: how to retrieve or get next item from json file when press click button listner

3-Jun-16 3:05

Hi I make one app have only one activity is main activity and it have
button
textview
linear layout
the json file i connect to it is

public static String URL_GET_Place = "https://api.foursquare.com/v2/venues/search?client_id=SVIBXYYXOEARXHDI4FWAHXGO5ZXOY204TCF1QJFXQLY5FPV4&client_secret=BAAJO1KXRWESGTJJGVON4W3WUFHAQDAJPLRIYJJ5OPHFQ5VI&v=20130815&ll=30.1136286,31.3280148&query=resturant";

what i need is get all items from this file item by item
based on three atributes and every click get next item
name,id,location
when i press the fab button to first time get first item
when i press the fab button to second time get second item
when i press the fab button to third time get third item
when i press the fab button to four time get four item
until i get all items in json file based on three attributs id,name,location
How i make that by code if possible help me

David Crow3-Jun-16 4:05

Re: how to retrieve or get next item from json file when press click button listner

3-Jun-16 4:05

ahmed_sa wrote:
How i make that by code if possible help me

Exactly what do you need help with, processing the file, responding to button clicks, populating a listview? What code have you put together so far? What is it (not) doing?

ahmed_sa3-Jun-16 12:34

Re: how to retrieve or get next item from json file when press click button listner

3-Jun-16 12:34

My code is

Java

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_eating);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        card1 = (LinearLayout) findViewById(R.id.card_one);
        card2 = (LinearLayout) findViewById(R.id.card_two);
        card3 = (LinearLayout) findViewById(R.id.card_three);

        tvTitle1 = (TextView) findViewById(R.id.tv_title1);
        tvTitle2 = (TextView) findViewById(R.id.tv_title2);
        tvTitle3 = (TextView) findViewById(R.id.tv_title3);

        tvDetails1 = (TextView) findViewById(R.id.tv_details1);
        tvDetails2 = (TextView) findViewById(R.id.tv_details2);
        tvDetails3 = (TextView) findViewById(R.id.tv_details3);

        //adding listeners
        card1.setonclickListener(this);
        card2.setonclickListener(this);
        card3.setonclickListener(this);

       // type = getIntent().getIntExtra("type", 1);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setonclickListener(new View.onclickListener() {
            @Override
            public void onclick(View view) {

                if (count < 3) {

                    new GetPlace().execute();
                }



            }
        });
    }




    class GetPlace extends AsyncTask<Void, Void, Void> {

        /**
         * Before starting background thread Show Progress Dialog
         */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(EatingActivity.this);
            pDialog.setMessage("Picking an Item...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
//            pDialog.show();
        }

        /**
         * Getting product details in background thread
         */
        protected Void doInBackground(Void... args) {

            // updating UI from Background Thread
            try {
                // Building Parameters
                List<NameValuePair> dataList = new ArrayList<NameValuePair>();
                //dataList.add(new BasicNameValuePair("id", '"' + args[0] + '"'));

                // getting product details by making HTTP request
                // Note that product details url will use GET request
                JSONObject json = jsonParser.
                        makeHttpRequest(AppConfig.URL_GET_Place, "GET", dataList);


                // json success tag
                JSONObject meta = json.getJSONObject("meta");
                success = meta.getInt("code");
                JSONObject response = json.getJSONObject("response");
                JSONArray venues = response.getJSONArray("venues");

                for (int i = 0; i < venues.length(); i++) {
                    selectedPlace = new Place();
                    JSONObject object = venues.getJSONObject(i);
                    selectedPlace.setTitle(object.getString("name"));
                    selectedPlace.setId(object.getString("id"));
                    JSONObject location = object.getJSONObject("location");

                    JSONArray formattedAddress=location.getJSONArray("formattedAddress");
                    Log.d("length",formattedAddress.length()+"");
                    String currentLocation="";
                    for (int j=0;j<formattedAddress.length();j++)
                    {
                        currentLocation+=formattedAddress.getString(j)+", ";
                        Log.d("address",currentLocation);
                    }

                    selectedPlace.setAddress(currentLocation);
                    selectedPlace.setLat(location.getDouble("lat"));
                    selectedPlace.setLng(location.getDouble("lng"));
                    Log.d("name", selectedPlace.getTitle());
                    places.add(selectedPlace);
                }

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

            return null;
        }


        /**
         * After completing background task Dismiss the progress dialog
         **/
        protected void onPostExecute(Void args) {
            // dismiss the dialog once got all details
            if (!pDialog.isShowing()) {
                pDialog.dismiss();
                if (success == 200) {

                    if (count == 0) {
                        card1.setVisibility(View.VISIBLE);
                        tvTitle1.setText(places.get(count).getTitle());
                        tvDetails1.setText(places.get(count).getAddress());
                    } else if (count == 1) {
                        card2.setVisibility(View.VISIBLE);
                        tvTitle2.setText(places.get(count).getTitle());
                        tvDetails2.setText(places.get(count).getAddress());
                    } else if (count == 2) {
                        card3.setVisibility(View.VISIBLE);
                        tvTitle3.setText(places.get(count).getTitle());
                        tvDetails3.setText(places.get(count).getAddress());
                    }
                    count++;
                } else {
                    Toast.makeText(EatingActivity.this, "Couldn't find any nearby places", Toast.LENGTH_LONG).show();

                }
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == android.R.id.home)
            finish();
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onclick(View view) {
        int index = 0;


            if (view.getId() == card1.getId()) {
                index = 0;
            } else if (view.getId() == card2.getId()) {
                index = 1;
            } else if (view.getId() == card3.getId()) {
                index = 2;
            }

            String strUri = "http://maps.google.com/maps?q=loc:"
                    + places.get(index).getLat() + "," + places.get(index).getLng() +
                    "(" + places.get(index).getTitle() + ")";
            Log.d("url",strUri);
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(strUri));
            startActivity(intent);



    }
}

ahmed_sa3-Jun-16 13:08

Re: how to retrieve or get next item from json file when press click button listner

3-Jun-16 13:08

What i need is when click fab button
on first time show first item
on second time click show second item
until it get all items in json file
meaning i need to customize code above
to show all items not three items but based on fab click
every click show item

Richard MacCutchan3-Jun-16 22:42

Re: how to retrieve or get next item from json file when press click button listner

3-Jun-16 22:42

That sounds like the wrong way to do it. Why not use a scrollable view (ListView or similar), populate it with all the items in the json data, and let the user scroll through it as necessary.

ahmed_sa4-Jun-16 1:02

Re: how to retrieve or get next item from json file when press click button listner

4-Jun-16 1:02

Thank you for reply
OK i will try with list view but
i need when click fab button retrieve me item by item
like scenario i will show
I will click fab button to first time it give me first item
when click fab to second time it give me second item
not show all item when press button
what i need actually press button get me item
when i press again give me next item until i get all items from json file

Richard MacCutchan4-Jun-16 1:06

Re: how to retrieve or get next item from json file when press click button listner

4-Jun-16 1:06

I'm not sure why you would want to do that, but I do not suppose it is too difficult. Just make sure that your reference to the JSON data is a class variable so you can access it from any method. You then just need to read the next record every time the button is pressed. Alternatively you could read all the data into some sort of List and use an index value to read each record in turn, and reset the index when you reach the last record.

David Crow4-Jun-16 3:16

Re: how to retrieve or get next item from json file when press click button listner

4-Jun-16 3:16

I agree.

David Crow4-Jun-16 3:16

Re: how to retrieve or get next item from json file when press click button listner

4-Jun-16 3:16

ahmed_sa wrote:
if (!pDialog.isShowing()) {
pDialog.dismiss();

This seems backward. Why would you dismiss a dialog that is not showing?

ahmed_sa4-Jun-16 11:24

How to resize layouts by swiping up and down

4-Jun-16 11:24

Thank you for reply
i will post my code full in another thread
and what i need to do

jasonalien1-Jun-16 6:45

jasonalien

1-Jun-16 6:45

Hello all,
I have two layouts, one is below the other one. When user swipes down, I want upper layout to be bigger, and lower layout to be smaller and vice versa for when user swipes up. How can I achieve that?
Here is my layout :

XML

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.mydomain.myapplication1212.MainActivity">

 <LinearLayout
     android:id="@+id/above_element"
     android:layout_width="match_parent"
     android:layout_height="250dp"
     >
     <ImageView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:src="@drawable/summ"/>
 </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_below="@+id/above_element"
        >
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/flowers"/>
    </LinearLayout>


</RelativeLayout>

Richard MacCutchan1-Jun-16 7:11

1-Jun-16 7:11

You will need to add a handler for the swip actions and adjust the sizes of the two layouts. See Creating Swipe Views with Tabs | Android Developers[^].

jasonalien1-Jun-16 7:25

jasonalien

1-Jun-16 7:25

Thank you for your answer, but your example doesn't answer my problem.

Richard MacCutchan1-Jun-16 21:03

1-Jun-16 21:03

I'm sorry but you have not really given enough detail of what your problem is.

jasonalien1-Jun-16 22:19

jasonalien

1-Jun-16 22:19

I have shared the problem and the source code. Can you tell me what I'm missing? Thanks.

David Crow2-Jun-16 4:28

OnkeyDown Event in Xamarin Forms

2-Jun-16 4:28

What do you need help with, responding to the swipe gesture, or resizing the layout?

Srinivas Soodula31-May-16 2:06

Srinivas Soodula

31-May-16 2:06

Hi.. I am new to Xamarin Forms. I am building an application in using PCL. I have an external trigger event like trigger gun event. I am unable to find the triggered event. Please help me .

my sample code like below and it works in android but I am expecting PCL Xamarin Form

public override Boolean OnKeyDown(Keycode keyCode, KeyEvent e)
       {
           // my code
       }

Get error when passing data using Intent

tan87325-May-16 21:15

tan873

25-May-16 21:15

Any problem for my coding? Please help, thanks.

XML

xml code
<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.user.myapplication.MyActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_send"
        android:layout_gravity="center_horizontal"
        android:id="@+id/btnsubmit"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <EditText
        android:layout_width="100dp"
        android:layout_height="45dp"
        android:text="key in here"
        android:id="@+id/medittext" />

</RelativeLayout>

Java

MyActivity.java
package com.example.user.myapplication;

import android.app.Activity ;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import static com.example.user.myapplication.R.*;

public class MyActivity extends Activity implements View.OnClickListener {
    EditText mtext;
    Button mbutton;

    <a href="http://www.codeproject.com/Members/OverRide">@Override</a>
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layout.activity_my);

        mtext   = (EditText)findViewById(id.medittext);
        mbutton = (Button)findViewById(id.btnsubmit);
        mbutton.setOnClickListener(this);
    }

    <a href="http://www.codeproject.com/Members/OverRide">@Override</a>
    public void onClick(View v) {
        // Do something in response to button
        Intent intent = new Intent(this, ViewActivity.class);
        String message = mtext.getText().toString();
        intent.putExtra("mtext",message);
        startActivity(intent);

    }
}

Java

ViewActivity.java
package com.example.user.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
/**
 * Created by User on 22/05/2016.
 */
public class ViewActivity extends Activity{
    TextView tview;

    <a href="http://www.codeproject.com/Members/OverRide">@Override</a>
    protected void onCreate(Bundle saveInstancestate) {
        super.onCreate(saveInstancestate);
        setContentView(R.layout.view);

        tview = (TextView)findViewById(R.id.tvView);
        Intent intent = getIntent();

        String abc = intent.getStringExtra("abc");

        tview.setText(abc);
    }
}

modified 31-May-16 11:13am.

Re: Get error when passing data using Intent

Richard Deeming26-May-16 2:08

Richard Deeming

26-May-16 2:08

Can you just move your head slightly to the left? You're in the way of the hidden camera we've installed behind you, and we can't see the error details on your screen. Roll eyes | :rolleyes:

Oh, wait; we don't have a camera pointing at your screen. We also don't have remote access to your computer, nor telepathy.

If you don't tell us what the error is, how do you think anyone will be able to fix it?

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Get error when passing data using Intent

David Crow26-May-16 4:29