App Automaticao Residencial

Question

I’m creating a home automation app, in it I have the main screen that when selecting the desired category it opens a second screen with the commands (example category lights, it opens the commands Luz1, Luz2, etc.), by clicking on the Imagebutton of the light1 it changes the icon (luzOff to Luzon), when I return to the main screen and enter again in the category of lights I lose my last state of Imagebutton. Example I opened the light category and left the Light1 on (Imagebutton will change the icon to Luzon), more when I go out to the main screen and go back to the screen of lights it opens with the light iconOff even if I leave the light on. How do I make the icon always keep its last state left, every time I open the screen ? (I’m sorry if I wasn’t clear and why it’s kind of hard to explain what I want).

public class Home extends Activity{ 

        private ImageButton btnLuz1;
        private ImageButton btnLuz2;
        Button btnVoltar;
        private Set<String> botoesOn;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.home);

            btnVoltar= (Button) findViewById(R.id.btnVoltar);
            btnVoltar.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    Intent voltaTela = new Intent(Home.this, MainActivity.class);
                    Home.this.startActivity(voltaTela);
                    Home.this.finish();

                }
            });

            btnLuz1 = (ImageButton) findViewById(R.id.btnLuz1);
            btnLuz2 = (ImageButton) findViewById(R.id.btnLuz2);

            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
            botoesOn = prefs.getStringSet("botoes", null);

            if(botoesOn == null){
                botoesOn = new HashSet<String>();
            }
            else{
                if(botoesOn.contains("botao1")){
                    btnLuz1.setImageResource(R.drawable.luzon);
                }
                if(botoesOn.contains("botao2")){
                    btnLuz1.setImageResource(R.drawable.luzon);
                }
            }
        }

        public void btnLuz1Click(View v){
            if(botoesOn.contains("botao1")){
                botoesOn.remove("botao1");
                btnLuz1.setImageResource(R.drawable.luzoff);
            }
            else{
                botoesOn.add("botao1");
                btnLuz1.setImageResource(R.drawable.luzon);
            }
        }

        public void btnLuz2Click(View v){
            if(botoesOn.contains("botao2")){
                botoesOn.remove("botao2");
                btnLuz2.setImageResource(R.drawable.luzoff);
            }
            else{
                botoesOn.add("botao2");
                btnLuz2.setImageResource(R.drawable.luzon);
            }
        }

        protected void onPause(){
            super.onPause();
            SharedPreferences prefs =  PreferenceManager.getDefaultSharedPreferences(this);
            prefs.edit().putStringSet("botoes", botoesOn).apply();
        }

    }

and xml:

<RelativeLayout 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: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=".Home" >

<ImageButton
    android:id="@+id/btnLuz1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_marginRight="100dp"
    android:layout_marginTop="53dp"
    android:layout_toLeftOf="@+id/btnLuzes"
    android:background="#00000000"
    android:onClick="bt1Click"
    android:src="@drawable/luzoff" />

<ImageButton
    android:id="@+id/btnLuz2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignTop="@+id/btnLuz1"
    android:layout_marginLeft="150dp"
    android:background="#00000000"
    android:onClick="bt2Click"
    android:src="@drawable/luzoff" />

<Button
    android:id="@+id/btnVoltar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignRight="@+id/btnLuzes"
    android:layout_marginBottom="98dp"
    android:layout_marginRight="95dp"
    android:text="Voltar" />

Error log:

05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.view.View$1.onClick(View.java:4007)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.view.View.performClick(View.java:4780)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.view.View$PerformClick.run(View.java:19866)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.os.Handler.handleCallback(Handler.java:739)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.os.Handler.dispatchMessage(Handler.java:95)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.os.Looper.loop(Looper.java:135)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.app.ActivityThread.main(ActivityThread.java:5257)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at java.lang.reflect.Method.invoke(Native Method)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at java.lang.reflect.Method.invoke(Method.java:372)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
05-07 11:50:45.466: E/AndroidRuntime(2422): Caused by: java.lang.NoSuchMethodException: bt1Click [class android.view.View]
05-07 11:50:45.466: E/AndroidRuntime(2422):     at java.lang.Class.getMethod(Class.java:664)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at java.lang.Class.getMethod(Class.java:643)
05-07 11:50:45.466: E/AndroidRuntime(2422):     at android.view.View$1.onClick(View.java:4000)
05-07 11:50:45.466: E/AndroidRuntime(2422):     ... 10 more

Answer 1

There are different ways to do this:

• Save button status in the bank (What I recommend).

• Receive modifications made to your commands Activity using the method onActivityResult(), and then, when you return to command Activity, you pass the last stored state. Using Intent (dice extra)

Answer 2

You can use Sharedpreference to store button states.

Start by declaring a Hashset that will save the buttons that are ON:

private Set<String> botoesOn;

In each of the methods onClick() button

if(botoesOn.contais("botao1"){
    botoesOn.remove("botao1");
    //Passar o botão para OFF
}
else{
    botoesOn.add("botao1");
    //Passar o botão para ON
}

Replace in each of the methods "botao1" for "botao2","botao3", etc..

In the method onPause() keep the Hashset on Sharedpreference:

protected void onPause(){
    super.onPause();
    SharedPreferences prefs =  PreferenceManager.getDefaultSharedPreferences(this);
    prefs.edit().putStringSet("botoes", botoesON).apply();
}

In the method onCreate() get the Hashset and update the buttons according to their previous state:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
botoesOn = prefs.getStringSet("botoes", null);

if(botoesOn == null){
    botoesOn = new HashSet<String>();
}
else{
    if(botoesOn.contains("botao1")){
        // colocar botao1 ON
    }
    if(botoesOn.contains("botao2")){
        // colocar botao2 ON
    }
    if(botoesOn.contains("botao3")){
        // colocar botao3 ON
    }
    ... //Repetir para todos os botões
    ...
}  

Together it’s like this:

public class TesteActivity extends Activity {

    private ImageButton btnLuz1;
    private ImageButton btnLuz2;
    private Set<String> botoesOn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.teste);

        btnLuz1 = (ImageButton) findViewById(R.id.btnLuz1);
        btnLuz2 = (ImageButton) findViewById(R.id.btnLuz2);

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        botoesOn = prefs.getStringSet("botoes", null);

        if(botoesOn == null){
            botoesOn = new HashSet<String>();
        }
        else{
            if(botoesOn.contains("botao1")){
                btnLuz1.setImageResource(R.drawable.luzon);
            }
            if(botoesOn.contains("botao2")){
                btnLuz1.setImageResource(R.drawable.luzon);
            }
        }
    }

    public void btnLuz1Click(View v){
        if(botoesOn.contains("botao1")){
            botoesOn.remove("botao1");
            btnLuz1.setImageResource(R.drawable.luzoff);
        }
        else{
            botoesOn.add("botao1");
            btnLuz1.setImageResource(R.drawable.luzon);
        }
    }

    public void btnLuz2Click(View v){
        if(botoesOn.contains("botao2")){
            botoesOn.remove("botao2");
            btnLuz2.setImageResource(R.drawable.luzoff);
        }
        else{
            botoesOn.add("botao2");
            btnLuz2.setImageResource(R.drawable.luzon);
        }
    }

    protected void onPause(){
        super.onPause();
        SharedPreferences prefs =  PreferenceManager.getDefaultSharedPreferences(this);
        prefs.edit().putStringSet("botoes", botoesOn).apply();
    }
}

XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F3F3F3">

    <ImageButton
        android:id="@+id/btnLuz1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/luzoff" 
        android:onClick="btnLuz1Click"/>

    <ImageButton
        android:id="@+id/btnLuz2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/luzoff" 
        android:onClick="btnLuz2Click"/>

</LinearLayout>