Android

public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
 {
     if (convertView == null)
     {
         convertView = _context.LayoutInflater.Inflate(Resource.Layout.ListItemCustomLayout, null);
     }

     var button = (Button)convertView.FindViewById(Resource.Id.HelloWorld);
     button.SetFocusable(ViewFocusability.NotFocusable);

     button.Click += (sender, e) =>
     {
         var groupName = ((Models.Timer)(((JavaObjectWrapper<Models.Timer>)GetChild(groupPosition, childPosition)).Obj)).GroupName;
         Toast.MakeText(_context, groupName, ToastLength.Long).Show();
     };

     return convertView;
 }

 implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support:design:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation project(':library')
    implementation 'de.hdodenhof:circleimageview:2.0.0'
    implementation 'com.android.support:cardview-v7:26.1.0'
    // JSON Parsing
    implementation 'com.google.code.gson:gson:2.6.1'
    implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
    implementation 'com.google.android.gms:play-services-ads:15.0.1'
    implementation 'com.google.android.gms:play-services:16.0.0'
    compile 'com.google.maps.android:android-maps-utils:'
    implementation 'org.apache.httpcomponents:httpcore:4.4.1'
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.google.firebase:firebase-core:15.0.1'
    implementation 'com.google.firebase:firebase-messaging:10.2.1'
    implementation 'com.facebook.android:account-kit-sdk:4.+'
    compile 'com.google.android.gms:play-services-ads:9.0.0'
    compile 'com.google.android.gms:play-services-analytics:9.0.0'
}
apply plugin: 'com.google.gms.google-services'
allprojects
        {
            repositories
                    {
                        jcenter()
                        google()
                    }

Error:(53, 13) Failed to resolve: com.google.maps.android:android-maps-utils:
<a href="openFile:/Users/vctroid/Desktop/vcare/app/build.gradle">Show in File</a>

Error:(52, 20) Failed to resolve: com.google.android.gms:play-services:16.0.0
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:/Users/vctroid/Desktop/vcare/app/build.gradle">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

Error:(56, 20) Failed to resolve: com.google.firebase:firebase-core:15.0.1
<a href="openFile:/Users/vctroid/Desktop/vcare/app/build.gradle">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

com.android.tools.idea.gradle.structure.editors.ModuleDependenciesTableItem@5a4a24e3	Implementation

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

    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"

        android:layout_height="wrap_content">


        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout2"
                android:layout_width="377dp"
                android:layout_height="64dp"
                android:layout_marginBottom="8dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                app:layout_constraintBottom_toTopOf="@+id/textView10"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent">

                <android.support.design.widget.TextInputEditText
                    android:layout_width="383dp"
                    android:layout_height="wrap_content"
                    android:hint="FIRST  NAME" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout"
                android:layout_width="374dp"
                android:layout_height="51dp"
                android:layout_marginBottom="8dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                app:layout_constraintBottom_toTopOf="@+id/textView11"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent">

                <android.support.design.widget.TextInputEditText
                    android:layout_width="384dp"
                    android:layout_height="46dp"
                    android:hint="LAST NAME" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout3"
                android:layout_width="384dp"
                android:layout_height="58dp"
                android:layout_marginBottom="8dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintBottom_toTopOf="@+id/textView12"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.0"
                app:layout_constraintStart_toStartOf="parent">

                <EditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="you@domain.com" />
            </android.support.design.widget.TextInputLayout>

            <TextView
                android:id="@+id/textView"
                android:layout_width="381dp"
                android:layout_height="45dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:text="FIRST NAME"
                android:textColor="#FF00"
                android:textColorHighlight="?attr/colorBackgroundFloating"
                android:textColorLink="?android:attr/colorLongPressedHighlight"
                app:layout_constraintBottom_toTopOf="@+id/textInputLayout2"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.461"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.727" />

            <TextView
                android:id="@+id/textView10"
                android:layout_width="372dp"
                android:layout_height="34dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                android:text="LAST NAME"
                android:textColor="#FF00"
                app:layout_constraintBottom_toTopOf="@+id/textInputLayout"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent" />

            <TextView
                android:id="@+id/textView11"
                android:layout_width="377dp"
                android:layout_height="37dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                android:text="EMAIL"
                android:textColor="#FF00"
                app:layout_constraintBottom_toTopOf="@+id/textInputLayout3"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent" />

            <TextView
                android:id="@+id/textView12"
                android:layout_width="376dp"
                android:layout_height="41dp"
                android:layout_marginBottom="8dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                android:text="PASSWORD"
                android:textColor="@color/pink"
                app:layout_constraintBottom_toTopOf="@+id/textInputLayout4"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent" />

            <android.support.design.widget.TextInputLayout
                android:id="@+id/textInputLayout4"
                android:layout_width="376dp"
                android:layout_height="57dp"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                tools:layout_editor_absoluteY="381dp">

                <android.support.design.widget.TextInputEditText
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="create a new password" />
            </android.support.design.widget.TextInputLayout>

            <Button
                android:id="@+id/button4"
                android:layout_width="160dp"
                android:layout_height="50dp"
                android:background="@color/blue"
                android:text="SIGNUP"
                android:textColor="?android:attr/colorLongPressedHighlight"
                tools:layout_editor_absoluteX="108dp"
                tools:layout_editor_absoluteY="540dp" />


            <CheckBox
                android:id="@+id/checkBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginEnd="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:text="I certify that I am 18 years of age or older, I agree of age of older, I agree to the User Agreement  and acknowledge the privacy Policy "
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.571"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textInputLayout4" />

        </RelativeLayout>
    </LinearLayout>

</ScrollView>

**errors**

    07-15 15:47:19.273 2204-4369/com.google.android.gms E/Herrevad: [309] RemoteReportsRefreshChimeraService.a: want to send authenticated request, but no Google account on device
    07-15 15:47:19.310 1180-1618/? E/Drm: Failed to find drm plugin
    07-15 15:47:19.387 2204-2769/com.google.android.gms E/Volley: [150] BasicNetwork.performRequest: Unexpected response code 307 for https://android.googleapis.com/nova/herrevad/network_quality_info
    07-15 15:50:44.074 4411-4411/? E/libprocessgroup: failed to make and chown /acct/uid_10058: Read-only file system
    07-15 15:50:46.582 4411-4411/com.android.dreamworker.droomapp E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.android.dreamworker.droomapp, PID: 4411
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.dreamworker.droomapp/com.android.dreamworker.droomapp.Keywordsearch}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
            at android.app.ActivityThread.access$800(ActivityThread.java:151)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
         Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
            at com.android.dreamworker.droomapp.Keywordsearch.onCreate(Keywordsearch.java:49)
            at android.app.Activity.performCreate(Activity.java:5990)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
            at android.app.ActivityThread.access$800(ActivityThread.java:151) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5254) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:372) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
    07-15 15:50:48.783 1536-1589/system_process E/InputDispatcher: channel '3e3c931 com.android.dreamworker.droomapp/com.android.dreamworker.droomapp.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.SearchView;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import java.util.ArrayList;

public class Keywordsearch extends AppCompatActivity {

ListView keywordlist;
KeywordlistAdapter adapter;
String[] title;
String[] description;
int[] icon;
ArrayList<Model> arrayList = new ArrayList<Model>();

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

    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setTitle("Items List");
    }

    title = new String[]{"Battery", "Cpu", "Display", "Memory", "Sensor"};
    description = new String[]{"Battery detail...", "Cpu detail...", "Display detail...", "Memory detail...", "Sensor detail..."};

    keywordlist = findViewById(R.id.keywordlist);

    for (int i =0; i<title.length; i++){
        Model model = new Model(title[i], description[i]);

        arrayList.add(model);
    }

    adapter = new KeywordlistAdapter(this, arrayList);

    //this is were it goes wrong according to catlog
    keywordlist.setAdapter(adapter);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu, menu);

    MenuItem myActionMenuItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView)myActionMenuItem.getActionView();
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            if (TextUtils.isEmpty(s)){
                adapter.filter("");
                keywordlist.clearTextFilter();
            }
            else {
                adapter.filter(s);
            }
            return true;
        }
    });
    return true;
}

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

    if (id==R.id.action_settings){

        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Keywordsearch"
android:background="@drawable/achtergrond">

<ListView
    android:id="@+id/keywordlist"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</ListView>

</RelativeLayout>

import android.widget.BaseAdapter;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.android.dreamworker.droomapp.com.android.dreamworker.droomapp.keywordactivity.NewActivity;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;


public class KeywordlistAdapter extends BaseAdapter {


    Context mContext;
    LayoutInflater inflater;
    List<Model> modellist;
    ArrayList<Model> arrayList;


    public KeywordlistAdapter(Context context, List<Model> modellist) {
        mContext = context;
        this.modellist = modellist;
        inflater = LayoutInflater.from(mContext);
        this.arrayList = new ArrayList<Model>();
        this.arrayList.addAll(modellist);
    }

    public class ViewHolder{
        TextView mTitleTv, mDescTv;
    }

    @Override
    public int getCount() {
        return modellist.size();
    }

    @Override
    public Object getItem(int i) {
        return modellist.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(final int postition, View view, ViewGroup parent) {
        ViewHolder holder;
        if (view==null){
            holder = new ViewHolder();
            view = inflater.inflate(R.layout.row, parent, false);


            holder.mTitleTv = view.findViewById(R.id.mainTitle);
            holder.mDescTv = view.findViewById(R.id.mainDesc);

            view.setTag(holder);

        }
        else {
            holder = (ViewHolder)view.getTag();
        }

        holder.mTitleTv.setText(modellist.get(postition).getTitle());
        holder.mDescTv.setText(modellist.get(postition).getDesc());



        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if (modellist.get(postition).getTitle().equals("Battery")){

                    Intent intent = new Intent(mContext, NewActivity.class);
                    mContext.startActivity(intent);
                }
                if (modellist.get(postition).getTitle().equals("Cpu")){

                    Intent intent = new Intent(mContext, NewActivity.class);
                    mContext.startActivity(intent);
                }
                if (modellist.get(postition).getTitle().equals("Display")){

                    Intent intent = new Intent(mContext, NewActivity.class);
                    mContext.startActivity(intent);
                }
                if (modellist.get(postition).getTitle().equals("Memory")){

                    Intent intent = new Intent(mContext, NewActivity.class);
                    mContext.startActivity(intent);
                }
                if (modellist.get(postition).getTitle().equals("Sensor")){

                    Intent intent = new Intent(mContext, NewActivity.class);
                    mContext.startActivity(intent);
                }
            }
        });


        return view;
    }


    public void filter(String charText){
        charText = charText.toLowerCase(Locale.getDefault());
        modellist.clear();
        if (charText.length()==0){
            modellist.addAll(arrayList);
        }
        else {
            for (Model model : arrayList){
                if (model.getTitle().toLowerCase(Locale.getDefault())
                        .contains(charText)){
                    modellist.add(model);
                }
            }
        }
        notifyDataSetChanged();
    }

}

public class Model {
    String title;
    String desc;


    //constructor
    public Model(String title, String desc) {
        this.title = title;
        this.desc = desc;

    }

    //getters


    public String getTitle() {
        return this.title;
    }

    public String getDesc() {
        return this.desc;
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:gravity="center"
    android:padding="10dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_marginLeft="5dp"
        android:layout_marginStart="5dp">
        <TextView
            android:id="@+id/mainTitle"
            android:text="Title"
            android:textStyle="bold"
            android:textSize="20sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/mainDesc"
            android:text="Description"
            android:textSize="20sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

</RelativeLayout>