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XML FORMAT <? xml version= "2.0" encoding= "utf-8" ?> < LinearLayout 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 :orientation= "vertical" tools :context= ".MainActivity" > < TextView android :layout_width= "wrap_content" android :layout_height= "wrap_content" android :layout_margin= "16dp" android :text= "quantity" android :textAllCaps= "true" /> < LinearLayout android :layout_width= "match_parent" android :layout_height= "wrap_content" android :orientation= "horizontal" > < Button android :id= "@+id/button4" an...

When dealing with strings in Java, an important concept to understand is string concatenation. Now that's a really big word, but it just means we're joining character strings together end to end. If this is a string and this is a string, you can combine them by concatenating them to make an even longer string. To concatenate these strings together, we use the plus operator. This is the same addition symbol that we know from math. Just like you can add numbers together, you can concatenate strings together. Let's look at an example. Say I have three different strings, one string literal says I need, another string literal says 2 cups of coffee, and another string literal says on Monday. I can use the plus symbol to concatenate all these strings together. That forms a ginormous string that says I...

When discussing how to position views in the last quiz, you may have mentioned using a relative layout. I know we did. But I want to introduce you to another way that you can build the layout for our app that would be more ideal, using nested viewgroups. Nested viewgroups means putting viewgroups inside other viewgroups. That way you can build more interesting and complex layouts like these. Let's see how you would build up one of these layouts. Say, for example, you have a vertical linear layout with three views, an image view and two text views. What if you wanted to overlay some text on top of this image? Well, with a linear layout, you can't overlap views. But with a relative layout, you can, so we can replace this child with a relative layout instead. Then, we can put the image view inside this relativ...

JUST JAVA JAVA CODE package com.example.android.justjava; /** * IMPORTANT: Add your package below. Package name can be found in the project's AndroidManifest.xml file. * This is the package name our example uses: * <p> * package com.example.android.justjava; */ import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget. TextView ; import java.text.NumberFormat; /** * This app displays an order form to order coffee. */ public class MainActivity extends AppCompatActivity { int quantity = 0 ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout. activity_main ); } /** * This method is called when the plus button is clicked. */ public void increment(View view) { quantity = quantity + 1 ; display( quantity ); /** * This method is called when the minus...

<? xml version= "2.0" encoding= "utf-8" ?> < LinearLayout 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 :orientation= "vertical" tools :context= ".MainActivity" > < RelativeLayout android :layout_width= "match_parent" android :layout_height= "wrap_content" android :paddingLeft= "5dp" android :paddingRight= "5dp" > < ImageView android :layout_width= "match_parent" android :layout_height= "match_parent" android :src= "@drawable/images" android :scaleType= "centerCrop" andr android :layout_gravity= "top" ...

We&#39;re making really good progress so far. As we continue to build more challenging things for our app, we&#39;re going to have to improve our debugging skills. In this video, we&#39;re going to learn about how to use a tool called the debugger. We&#39;ll access the debugger using Android Studio. And the debugger is meant to help us identify and fix errors in our code. The great thing about the debugger is that we can pause the app at a certain point in time, and then we can inspect the whole state of the app more closely. Normally, when the app is running on our device, all the code gets executed very rapidly. Within milliseconds, it can respond to button clicks, update the screen, calculate the price, and etc. But with the debugger, we can pause at a specific line of code in our app, then we can step through our code line by line as quickly or slowly as we want. If you want to learn more techniques on how to debug your app in Android St...