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<resources>
    <string name="app_name">GithubSearch</string>

    <string name="search">Search</string>

    <!--TODO (1) Add a string stating that an error has occurred-->
    <string name="error_message">
        Failed to get results. Please try again.
    </string>
</resources>

    <!--TODO (2) Wrap the ScrollView in a FrameLayout-->
    <!--TODO (3) Make the width and height of the FrameLayout match_parent-->
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp">
            <TextView
                android:id="@+id/tv_github_search_results_json"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Make a search!"
                android:textSize="18sp" />
        </ScrollView>
    </FrameLayout> 

        <TextView
            android:id="@+id/tv_error_message_display"
            android:textSize="22sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="16dp"
            android:text="@string/error_message"
            android:visibility="invisible" /> 

        <ProgressBar
            android:id="@+id/pb_loading_indicator"
            android:layout_height="42dp"
            android:layout_width="42dp"
            android:layout_gravity="center"
            android:visibility="invisible" /> 

import android.widget.ProgressBar;
...
    // TODO (12) Create a variable to store a reference to the error message TextView
    private TextView mErrorMessageDisplay;
    // TODO (24) Create a ProgressBar variable to store a reference to the ProgressBar
    private ProgressBar mLoadingIndicator; 

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

        mSearchBoxEditText = (EditText) findViewById(R.id.et_search_box);
        mUrlDisplayTextView = (TextView) findViewById(R.id.tv_url_display);
        mSearchResultsTextView = (TextView) findViewById(R.id.tv_github_search_results_json);

        // TODO (13) Get a reference to the error TextView using findViewById
        mErrorMessageDisplay = (TextView) findViewById(R.id.tv_error_message_display);
        // TODO (25) Get a reference to the ProgressBar using findViewById
        mLoadingIndicator = (ProgressBar) findViewById(R.id.pb_loading_indicator);
    } 

    // TODO (14) Create a method called showJsonDataView to show the data and hide the error
    private void showJsonDataView() {
        // First, make sure the error is invisible
        mErrorMessageDisplay.setVisibility(View.INVISIBLE);
        // Then, make sure the JSON data is visible
        mSearchResultsTextView.setVisibility(View.VISIBLE);
    }


    // TODO (15) Create a method called showErrorMessage to show the error and hide the data
    private void showErrorMessage() {
        // First, hide the currently visible data
        mSearchResultsTextView.setVisibility(View.INVISIBLE);
        // Then, show the error
        mErrorMessageDisplay.setVisibility(View.VISIBLE);
    } 

        @Override
        protected void onPostExecute(String githubSearchResults) {
            if (githubSearchResults != null && !githubSearchResults.equals("")) {
                // TODO (17) Call showJsonDataView if we have valid, non-null results
                showJsonDataView();
                mSearchResultsTextView.setText(githubSearchResults);
            } else {
                // TODO (16) Call showErrorMessage if the result is null in onPostExecute
                showErrorMessage();
            }
        } 

        // TODO (26) Override onPreExecute to set the loading indicator to visible
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mLoadingIndicator.setVisibility(View.VISIBLE);
        } 

    @Override
    protected void onPostExecute(String githubSearchResults) {
        // TODO (27) As soon as the loading is complete, hide the loading indicator
        mLoadingIndicator.setVisibility(View.INVISIBLE);
       
        if (githubSearchResults != null && !githubSearchResults.equals("")) {
            // TODO (17) Call showJsonDataView if we have valid, non-null results
            showJsonDataView();
            mSearchResultsTextView.setText(githubSearchResults);
        } else {
            // TODO (16) Call showErrorMessage if the result is null in onPostExecute
            showErrorMessage();
        }
    } 

import android.os.AsyncTask;

...

     // TODO (1) Create a class called GithubQueryTask that extends AsyncTask<URL, Void, String>
    public class GithubQueryTask extends AsyncTask<URL, Void, String> {

        // TODO (2) Override the doInBackground method to perform the query. Return the results. (Hint: You've already written the code to perform the query)
        @Override
        protected String doInBackground(URL... params) {
            URL searchUrl = params[0];
            String githubSearchResults = null;
            try {
                githubSearchResults = NetworkUtils.getResponseFromHttpUrl(searchUrl);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return githubSearchResults;
        }


        // TODO (3) Override onPostExecute to display the results in the TextView
        @Override
        protected void onPostExecute(String githubSearchResults) {
            if (githubSearchResults != null && !githubSearchResults.equals("")) {
                mSearchResultsTextView.setText(githubSearchResults);
            }
        }
    }

//        String githubSearchResults = null;
//        try {
//            githubSearchResults = NetworkUtils.getResponseFromHttpUrl(githubSearchUrl);
//            mSearchResultsTextView.setText(githubSearchResults);
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
        // TODO (4) Create a new GithubQueryTask and call its execute method, passing in the url to query
        new GithubQueryTask().execute(githubSearchUrl); 

import java.io.IOException;

...

     private void makeGithubSearchQuery() {
        String githubQuery = mSearchBoxEditText.getText().toString();
        URL githubSearchUrl = NetworkUtils.buildUrl(githubQuery);
        mUrlDisplayTextView.setText(githubSearchUrl.toString());

        // TODO (2) Call getResponseFromHttpUrl and display the results in mSearchResultsTextView
        // TODO (3) Surround the call to getResponseFromHttpUrl with a try / catch block to catch an IOException
        String githubSearchResults = null;
        try {
            githubSearchResults = NetworkUtils.getResponseFromHttpUrl(githubSearchUrl);
            mSearchResultsTextView.setText(githubSearchResults);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

 2019-01-13 13:22:41.295 3960-3960/com.example.android.datafrominternet E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.android.datafrominternet, PID: 3960
    android.os.NetworkOnMainThreadException
        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1448)
        at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:102)
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:90)
        at java.net.InetAddress.getAllByName(InetAddress.java:787)
        at com.android.okhttp.Dns$1.lookup(Dns.java:39)
        at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:175)
        at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:141)
        at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:83)
        at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:174)
        at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
        at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:407)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:244)
        at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
        at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(Unknown Source:0)
        at com.example.android.datafrominternet.utilities.NetworkUtils.getResponseFromHttpUrl(NetworkUtils.java:76)
        at com.example.android.datafrominternet.MainActivity.makeGithubSearchQuery(MainActivity.java:63)
        at com.example.android.datafrominternet.MainActivity.onOptionsItemSelected(MainActivity.java:80)
        at android.app.Activity.onMenuItemSelected(Activity.java:3435)

    public static URL buildUrl(String githubSearchQuery) {
        // TODO (1) Fill in this method to build the proper Github query URL
        return null;
    } 

    public static URL buildUrl(String githubSearchQuery) {
        // COMPLETED (1) Fill in this method to build the proper Github query URL
        Uri builtUri = Uri.parse(GITHUB_BASE_URL).buildUpon()
                .appendQueryParameter(PARAM_QUERY, githubSearchQuery)
                .appendQueryParameter(PARAM_SORT, sortBy)
                .build();

        URL url = null;
        try {
            url = new URL(builtUri.toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        return url;
    } 

    private void makeGithubSearchQuery() {
        String githubQuery = mSearchBoxEditText.getText().toString();
        URL githubSearchUrl = NetworkUtils.buildUrl(githubQuery);
        mUrlDisplayTextView.setText(githubSearchUrl.toString());
    } 

@Override
public boolean onOptionsItemSelected(MenuItem item){
    int itemThatWasClickedId = item.getItemId();

    if (itemThatWasClickedId == R.id.action_search) {
        // COMPLETED (4) Remove the Toast message when... is clicked
//            Context context = MainActivity.this;
//            String textToShow = "Search clicked";
//            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();


        // COMPLETED (5) Call makeGithubSearchQuery when... clicked
        makeGithubSearchQuery();

        return true;
    } 

<resources>
    <string name="app_name">GithubSearch</string>

    <!--TODO (1) Add a string resource called search with the title "Search"-->
    <string name="search">Search</string>
</resources>
 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/action_search"
        android:orderInCategory="1"
        app:showAsAction="ifRoom"
        android:title="@string/search"/>
</menu> 

import android.view.Menu;

...

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

// TODO (8) Override onCreateOptionsMenu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // TODO (9) Within onCreateOptionsMenu, use getMenuInflater().inflate to inflate the menu
    getMenuInflater().inflate(R.menu.main, menu);
    // TODO (10) Return true to display your menu
    return true;
} 

import android.view.MenuItem;

...

@Override
public boolean onOptionsItemSelected(MenuItem item){
    return false;
}

import android.content.Context;
import android.widget.Toast;

...

// TODO (11) Override onOptionsItemSelected
@Override
public boolean onOptionsItemSelected(MenuItem item){
    // TODO (12) Within onOptionsItemSelected, get the ID of the item that was selected
    int itemThatWasClickedId = item.getItemId();

    // TODO (13) If the item's ID is R.id.action_search, show a Toast and return true to tell Android that you've handled this menu click
    if (itemThatWasClickedId == R.id.action_search) {
        Context context = MainActivity.this;
        String textToShow = "Search clicked";
        // TODO (14) Don't forgot to call .show() on your Toast
        Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
        return true;
    }

    // TODO (15) If you do NOT handle the menu click, return super.onOptionsItemSelected to let Android handle the menu click
    return super.onOptionsItemSelected(item);
}

 <android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

...

</android.support.constraint.ConstraintLayout>

 <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"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    tools:context=".MainActivity">
</LinearLayout>

...

</LinearLayout>

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" /> 

<EditText
    android:id="@+id/et_search_box"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Enter a query, then click Search"
    android:textSize="22sp" /> 

<TextView
    android:id="@+id/tv_url_display"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:text="Click search and your URL will show up here!"
    android:textSize="22sp" /> 

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="16dp">
   
</ScrollView> 

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="16dp">
    <TextView
        android:id="@+id/tv_github_search_results_json"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Make a search!"
        android:textSize="18sp" />
</ScrollView> 

import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    // TODO (26) Create an EditText variable called mSearchBoxEditText
    private EditText mSearchBoxEditText;
    // TODO (27) Create a TextView variable called mUrlDisplayTextView
    private TextView mUrlDisplayTextView;
    // TODO (28) Create a TextView variable called mSearchResultsTextView
    private TextView mSearchResultsTextView;

...   
}

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

    // TODO (29) Use findViewById to get a reference to mSearchBoxEditText
    mSearchBoxEditText = (EditText) findViewById(R.id.et_search_box);

    // TODO (30) Use findViewById to get a reference to mUrlDisplayTextView
    mUrlDisplayTextView = (TextView) findViewById(R.id.tv_url_display);

    // TODO (31) Use findViewById to get a reference to mSearchResultsTextView
    mSearchResultsTextView = (TextView) findViewById(R.id.tv_github_search_results_json);
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:25.1.0'

    // TODO (32) Remove the ConstraintLayout dependency as we aren't using it for these simple projects
    compile 'com.android.support.constraint:constraint-layout:1.0.0-beta4'
} 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/tv_toy_names"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"
            android:padding="16dp"
            android:textSize="20sp" />
    </ScrollView>
</FrameLayout>

before

 after

 <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:padding="16dp"
    android:textSize="20sp" />

 <TextView
    android:id="@+id/tv_toy_names"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:textSize="20sp" />

package com.example.nobang.favoritetoys;

public final class ToyBox {

    public static String[] getToyNames() {
        return new String[] {
                "Red Toy Wagon",
                "Chemistry Set",
               
                "Squirt Guns",
                "Miniature Replica Animals Stuffed with Beads that you swore to your parents would be worth lots of money one day",
                "Creepy Gremlin Doll",
                "Neodymium-Magnet Toy"
        };
    }
} 

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nobang.favoritetoys/com.example.nobang.favoritetoys.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.append(java.lang.CharSequence)' on a null object reference
 

Your project path contains non-ASCII characters. This will most likely cause the build to fail on Windows. Please move your project to a different directory. See http://b.android.com/95744 for details. This warning can be disabled by adding the line 'android.overridePathCheck=true' to gradle.properties file in the project directory.
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