I'm creating my first Android App, and as part of it, I need to add new buttons after a click on another button.
Then I need to create() a button after a onClick() event on another button.
How to do it?
Things you should know:
I am using Android Studio to develop the app,
I have already imported these:
import android.view.*;
import android.widget.Button;
import android.widget.TextView;
And I'd like to know where to get the whole Library list for android, or better, I'd like you to say what's your best android library to develop on such these things, I need to find and get experienced on a library so I'll need suggestions!
Thanks a lot in advance :)
P.S. Just typed those create() and onClick() to make it clear that I was talking about methods, but not that both of 'em are real ones or the ones I'll need ;)
P.P.S. I don't know how many buttons will be ther becuase I do NOT choose that, the user does, it's somethig like: I want to create a new thing, then I press the button '+' and create a new button (the new thing), for this reason, the amount of buttons isn't known, that's why I can't use the visibility trick, but yeah I first thought about that aswell!
rockfight's answer is correct, but I would recommend you to use the button in your layout with android:visibility="gone" and then show it when the user taps on the first button using button2.setVisibility(View.Visible).
It's always easier to create your layouts and views in xml instead of code.
Personally, I'm using support-v4 library, recyclerview, recently-released design library and some of the Google Play Services libraries.
EDIT: if you're going to add a lot of buttons, and you don't know how many, I'd recommend you to use ListView or RecyclerView. I personally prefer RecyclerView, but it might be more difficult to set up. Anyway, you'll be adding items to your list. That items are basically buttons, so your item layout would look like this:
item_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<Button xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a new button!"
android:layout_margin="16dp"
android:gravity="center_vertical|center_horizontal"
android:elevation="2dp"
android:translationZ="6dp" />
<!-- Material Design. See http://www.google.com/design/spec/what-is-material/elevation-shadows.html#elevation-shadows-elevation-android- -->
<!-- The attributes you need...... -->
That's all. You don't have to mess with ugly code. If you want to get an idea of the advantages of RecyclerView, see http://antonioleiva.com/recyclerview/.
Create a button object
Button myButton = new Button(this);
Then add button to your layout
LinearLayout layout = (LinearLayout) findViewById(R.id.my_layout);
layout.addView(myButton);
I am not sure what library are you talking about. To learn about android go to android developer website and click search button and search what you want to know. You will get all libraries there.
You do not need libraries for making onClick methods. When you have your button, set onClick method like this: button.setOnClickListener(new onClickListener...) if you press Ctrl+Space you will get possible choices of what to choose.
How many buttons do you wish to add programmatically? Maybe it would be better if you create buttons in xml and use Visibility.GONE and Visibility.VISIBLE if there are not many buttons and you know the end number of them.
Related
How to Highlight text in android TextView like this?
& also how to show a custom dialogue on text selection?
I Have Tried with TextView default property
android:enabled="true"
android:textIsSelectable="true"
android:focusable="true"
android:longClickable="true"
But By Using this it only show default share and copy option from android.
You can set the hilight by calling setSelection on the TextView. As for the dialog- you can add to it, but you can't remove from it. The way to add to it is to create an Activity with an intent filter that makes it catch the PROCESS_TEXT action. That will automatically make Android add your app to the copy paste bar with the name of your app, and allow users to click on it to perform whatever transformation you wish.
Please note that this will occur in every app, not just your own. I don't know of a way to make it specific to your app.
So for example the "Tweet" option on your bar there is because you have twitter installed. Delete it and the option would disappear. There's no other way, other than to totally turn off that menu and build your own version.
I am developing an android app as an educational project. I have created a GridView object, which uses a custom GridAdapter. The grid, as default, loads a set of placeholder images. I want the user to be able to replace those placeholder images with either their own image, some text, or a link to a youtube video.
I can't find any info on whether this is feasible. I specify an Imageview in my XML file, so I don't know how I could change this at run time? I wondered if I should create a TextView object in the XML, and layer them, and then create a method that brings one to the front? Any advice at all would be very much appreciated. It would be great to know if it's doable or not.....
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView"
android:layout_centerInParent="true"
/>
My suggestion is define TextView etc. in xml with gone visibility. When user has some actions get visible them and set visibility gone of ImageView.
Set the visibilities of the container based on user input... What ever user chooses make tat container visible and other two as Gone... This would work
I am trying to build an app using the new material design specs.
I am currently trying to get a cusdtom FAB layout working, similar to the one in the new Inbox app.
I have one main button, which when clicked, expands to several smaller ones.
However i want to add a textview to the left of the smaller buttons, like the inbox app.
I cant seem to find a way of doing this.
The floating action button i am using is based off this library, but with a few modifications https://github.com/futuresimple/android-floating-action-button/blob/master/README.md
If someone could suggest a way of doing this, it would be much appreciated.
Thanks
Corey :)
I'm working on a checkbook app, and I'd like to use a small widget like a TimePickerDialog or DatePickerDialog but one that acts like a keypad so the user can enter an account or transaction balance. I know I can use an EditText but I would like to be able to implement a keypad.
Does Android have any predefined UI elements to support this? I have tried to find some, but without luck. I did find an interesting article to implement my own using a GridLayout, but wondered if someone was aware of any Android classes that could already do this.
The GridLayout method: http://code.tutsplus.com/tutorials/android-user-interface-design-creating-a-numeric-keypad-with-gridlayout--mobile-8677
If you specify android:inputType="numberDecimal" in the XML for your EditText, you'll get a keypad. If you decide that you need a more specialized keyboard, there's a very good tutorial here.
Some tips:
Read this tutorial: Creating an Input Method
Clone this repo: LatinIME
I am working on an Android project where a group of buttons needs to show on the bottom of every screen (activity) in the application. The group of buttons are basically a navigation bar. I want to know the best way to do this without creating new buttons for every activity. I have been around programming (C++/C#) for many years but am pretty new to Android and Java so if someone can point me in a general direction, it would be appreciated.
Thanks.
I bet you need to use "include" tag for xml layouts. It's the best when you need to reuse some UI components. See http://www.curious-creature.org/2009/02/25/android-layout-trick-2-include-to-reuse/ for the examples and description.
To elaborate on Konstantin's answer, after you've used include, you'll need to bind actions to these buttons.
If the buttons should have the same action regardless of the activity they are in, use the include tag to create their layout and then create a parent NavigationActivity (or whatever else you want to call it) class from which all your other activites will inherits.
In the parent NavigationActivity class' onCreate method, you can set up the onClickListener (and other needed stuff) for the buttons.