Washing mashines app in two activities

I managed to separate the list of machines and the details into separated activities.
All is the same as before except details are opened into new window.

The next part would be to add image to be shown along with the details of each washing machine.

Again the data used for the machines is arbitrary so it is not 100% correct. Just for practising purpose.

My strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">WashingMachines</string>
    <string name="action_settings">Settings</string>
    <string name="machine_type">Machine type</string>
    <string name="brand_name">Brand name</string>
    <string name="weight">Weight</string>
    <string name="maxRpm">Max RPM</string>
    <string name="washTemp">Washing temperature</string>
    <string name="hasEnergyStar">Has energy star</string>
    <string name="powerUsage">Power usage</string>
    <string name="title_activity_details">MainActivity</string>
    <string name="main_list_btn">To the list</string>   
</resources>

activity_main.xml now has only list view component in linear layout for listing the available machines.

Here it is:

<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: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=".MainActivity" >

    <ListView
        android:id="@+id/scroll_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
    </ListView>

</LinearLayout>

A new layout is added for the DetailsActivity.java, details.xml.
<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: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=".DetailsActivity" >

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/machine_type" />

                    android:id="@+id/machine_type_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/machine_type" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/brand_name" />

                    android:id="@+id/brand_name_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/brand_name" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/weight" />

                    android:id="@+id/weight_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/weight" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/maxRpm" />

                    android:id="@+id/max_rpm_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/maxRpm" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/washTemp" />

                    android:id="@+id/wash_temp_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/washTemp" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/hasEnergyStar" />

                    android:id="@+id/has_energy_star_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hasEnergyStar" />
   

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

                    android:layout_width="140dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:text="@string/powerUsage" />

                    android:id="@+id/power_usage_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/powerUsage" />
   

           android:id="@+id/main_list_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/main_list_btn" />

It contains all the text fields for showing data about clicked machine from the main list. I used the wizard to add new android activity and it created details.xml layout file automatically.

Right click on your project node in Projects Tab -> New -> Other -> Android Activity

Name you new activity as you like I named it DetailsActivity and details.xml

Now about java classes.

WashingMachine.java stays the same as in previous post.

MainActivity.java look like this:

package com.example.washingmachines;

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

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

    private ListView machines = null;
    private List listOfMachines = new ArrayList();
    private ArrayAdapter adapter = null;
    private List machinesList = new ArrayList();
   
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
    }

    private void initView() {

        this.machines = (ListView) findViewById(R.id.scroll_view);

        WashingMachine wm1 = new WashingMachine("front", "LG", 65, 1200, 41,
                false, 100);
        this.listOfMachines.add(wm1);

        WashingMachine wm2 = new WashingMachine("top", "Samsung", 73, 800, 60,
                false, 90);
        this.listOfMachines.add(wm2);

        WashingMachine wm3 = new WashingMachine("hybrid", "BSH", 52, 1650, 36,
                true, 70);
        this.listOfMachines.add(wm3);

        WashingMachine wm4 = new WashingMachine("top", "Whirlpool", 105, 1400,
                56, false, 150);
        this.listOfMachines.add(wm4);

        WashingMachine wm5 = new WashingMachine("front", "Gorenje", 360, 2000,
                70, false, 300);
        this.listOfMachines.add(wm5);

        WashingMachine wm6 = new WashingMachine("hybrid", "Videocon", 300,
                2000, 85, false, 310);
        this.listOfMachines.add(wm6);

        this.machinesList.add(this.listOfMachines.get(0).getBrandName());
        this.machinesList.add(this.listOfMachines.get(1).getBrandName());
        this.machinesList.add(this.listOfMachines.get(2).getBrandName());
        this.machinesList.add(this.listOfMachines.get(3).getBrandName());
        this.machinesList.add(this.listOfMachines.get(4).getBrandName());
        this.machinesList.add(this.listOfMachines.get(5).getBrandName());

        this.adapter = new ArrayAdapter(this,
                android.R.layout.simple_list_item_1, this.machinesList);
        this.machines.setAdapter(adapter);

        this.machines.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView arg0, View arg1, int arg2,
                    long arg3) {
                Intent k = new Intent(MainActivity.this, DetailsActivity.class);
                k.putExtra("type", listOfMachines.get(arg2).getType());
                k.putExtra("brandName", listOfMachines.get(arg2).getBrandName());
                k.putExtra("weight", listOfMachines.get(arg2).getWeight());
                k.putExtra("maxRpm", listOfMachines.get(arg2).getMaxRpm());
                k.putExtra("washTemp", listOfMachines.get(arg2).getWashTemp());
                k.putExtra("hasEnergyStar", listOfMachines.get(arg2).isHasEnergyStar());
                k.putExtra("powerUsage", listOfMachines.get(arg2).getPowerUsage());
                startActivity(k);

            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

I create new Intent that launches DetailsActivity and put data from the clicked machine into the new intent using putExtra() method. Than I start the new activity

Intent k = new Intent(MainActivity.this, DetailsActivity.class);

k.putExtra("type", listOfMachines.get(arg2).getType());
                
k.putExtra("brandName", listOfMachines.get(arg2).getBrandName());
                
k.putExtra("weight", listOfMachines.get(arg2).getWeight());
               
 k.putExtra("maxRpm", listOfMachines.get(arg2).getMaxRpm());
               
 k.putExtra("washTemp", listOfMachines.get(arg2).getWashTemp());
                
k.putExtra("hasEnergyStar", listOfMachines.get(arg2).isHasEnergyStar());
                
k.putExtra("powerUsage", listOfMachines.get(arg2).getPowerUsage());
                
startActivity(k);

arg2 is the index of the clicked item in the list view.

Now the last class is DetailsActivity.java which read the extra data sent to it and fills the text views that reside inside it.

package com.example.washingmachines;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class DetailsActivity extends Activity {

    private TextView type = null;
    private TextView brandName = null;
    private TextView weight = null;
    private TextView maxRmp = null;
    private TextView washTemp = null;
    private TextView hasEnergyStar = null;
    private TextView powerUsage = null;
    private Button mainListBtn = null;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.details);
      
        this.type = (TextView) findViewById(R.id.machine_type_view);
        this.brandName = (TextView) findViewById(R.id.brand_name_view);
        this.weight = (TextView) findViewById(R.id.weight_view);
        this.maxRmp = (TextView) findViewById(R.id.max_rpm_view);
        this.washTemp = (TextView) findViewById(R.id.wash_temp_view);
        this.hasEnergyStar = (TextView) findViewById(R.id.has_energy_star_view);
        this.powerUsage = (TextView) findViewById(R.id.power_usage_view);
      
        String typeValue = getIntent().getStringExtra("type");
        this.type.setText(typeValue);
      
        String brandNameValue  = getIntent().getStringExtra("brandName");
        this.brandName.setText(brandNameValue);
      
        String weightValue  = getIntent().getStringExtra("weight");
        this.weight.setText(weightValue);
      
        String maxRpmValue  = getIntent().getStringExtra("maxRpm");
        maxRmp.setText(maxRpmValue);
      
        String washTempValue  = getIntent().getStringExtra("washTemp");
        washTemp.setText(washTempValue);
      
        String hasEnergyStarValue = getIntent().getBooleanExtra("hasEnergyStar", false) ? "yes" : "no";
        hasEnergyStar.setText(hasEnergyStarValue);
      
        String powerUsageValue  = getIntent().getStringExtra("powerUsage");
        powerUsage.setText(powerUsageValue);
      
        this.mainListBtn = (Button) findViewById(R.id.main_list_btn);
        this.mainListBtn.setOnClickListener(new OnClickListener() {
          
            @Override
            public void onClick(View arg0) {
                finish();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.details, menu);
        return true;
    }

}


I read the extra data using getString/getInt/getBoolean etc... methods inside the intent returned by getIntent() method.

Example:

String powerUsageValue  = getIntent().getStringExtra("powerUsage");
powerUsage.setText(powerUsageValue);

Now the next question is how do I return back to the list. I added a button for this in the details.xml layout file. And I use finish() method to close and destroy the instance of the current activity. Afterwards the focus is returned to the MainActivity of the application.


 this.mainListBtn = (Button) findViewById(R.id.main_list_btn);
        this.mainListBtn.setOnClickListener(new OnClickListener() {
          
            @Override
            public void onClick(View arg0) {
                finish();
            }
        });


Result images:

machines list

machine details