How do i change the actual size of the edit text box depending on what button is pressed?

Question

I am trying to make a customisation app for wooden signs. When the user clicks say on a 10 x10 size sign i want the edit text box to change size to demonstrate what they have done. Can this be done on android studio? This is my code so far, I think what i have done is changed the size of the text but it crashes when the button is clicked so i don't know. Java File:

public class Letters extends AppCompatActivity {
    int txtSize = 14;
    EditText Wood;
    Button bSize, bSize1, bSize2, bSize3;

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

        Button bSize = (Button) findViewById(R.id.bSize);
        Button bSize1 = (Button) findViewById(R.id.bSize1);
        Button bSize2 = (Button) findViewById(R.id.bSize2);
        Button bSize3 = (Button) findViewById(R.id.bSize3);

        bSize.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (Wood.getTextSize() == 15) {
                    txtSize--;
                    Wood.setTextSize(txtSize);
                } else {
                    txtSize += 0;
                    Wood.setTextSize(txtSize);
                }
            }
        });
        bSize1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (Wood.getTextSize() == 16) {
                    txtSize--;
                    Wood.setTextSize(txtSize);
                } else {
                    txtSize += 0;
                    Wood.setTextSize(txtSize);
                }
            }
        });

        bSize2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (Wood.getTextSize() == 17) {
                    txtSize--;
                    Wood.setTextSize(txtSize);
                } else {
                    txtSize += 0;
                    Wood.setTextSize(txtSize);
                }
            }
        });


        bSize3.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (Wood.getTextSize() == 18) {
                    txtSize--;
                    Wood.setTextSize(txtSize);
                } else {
                    txtSize += 0;
                    Wood.setTextSize(txtSize);
                }
            }
        });

    }
}

xml file:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:padding="60dp"
    android:layout_width="match_parent"
    android:weightSum="1">

    <Button
        android:id="@+id/bSize"
        android:text="15 x 10 cm "
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="bSize" />

    <Button
        android:id="@+id/bSize1"
        android:text="20 x 15 cm"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="bSize1" />

    <Button
        android:id="@+id/bSize2"
        android:text="30 x 7 cm"
        android:layout_width="103dp"
        android:layout_height="61dp"
        android:onClick="bSize2" />

    <Button
        android:id="@+id/bSize3"
        android:text="30 x 20 cm"
        android:layout_width="0dp"
        android:layout_marginBottom="20dp"
        android:layout_height="160dp"
        android:onClick="bSize3"
        android:layout_gravity="center_vertical" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:id="@+id/Wood"
        android:textSize="40dp"
        android:layout_alignTop="@+id/button3"
        android:layout_centerHorizontal="true"
        android:background="#795548"
        android:hint="Choose Letters.."/>

</LinearLayout>

As an aside, you should follow standard naming conventions for variables, so the variable "Wood" should begin with a lowercase letter, "wood". — chRyNaN, Feb 27 '16 at 16:33

score 1 · Accepted Answer · answered Feb 27 '16 at 16:29

1

Your application crashes probably because of a NullPointerException. This is because you have not initialized your Wood variable in the onCreate method.

What you should do is this:

Wood = (EditText) findViewById(R.id.Wood);
Button bSize = (Button) findViewById(R.id.bSize);
Button bSize1 = (Button) findViewById(R.id.bSize1);
Button bSize2 = (Button) findViewById(R.id.bSize2);
Button bSize3 = (Button) findViewById(R.id.bSize3);

When your app crashes, there is a logcat error stacktrace in Android Studio. The stacktrace shows you what exception have caused the crash. You can easily solve problems by looking at the logcat logs.

answered Feb 27 '16 at 16:29

Krasimir Stoev

1,734
11
9

thanks. Do you know how to change the size of the actual editText box not the text inside it, when the button is pressed. Thanks – 09Emi Feb 27 '16 at 16:42
try these suggestions: http://stackoverflow.com/questions/4257843/in-android-how-to-create-edittext-of-fixed-width – Krasimir Stoev Feb 27 '16 at 16:44
By size do you mean the width and height of the editText? – Krasimir Stoev Feb 27 '16 at 16:44
There are methods setWidth and setHeight if you need to change the dimensions of the EditText itself – Krasimir Stoev Feb 27 '16 at 16:47
@Kraimir Stoev yeah I'm wanting to change the dimensions of the setWidth and setHeight when certain buttons are pressed. – 09Emi Feb 27 '16 at 16:50
Well, Woods.setWidth(x) and Woods.setHeight(y) is what you can try. x and y should be determined by the button you have clicked. You can see the setWidth and setHeight methods documentation. – Krasimir Stoev Feb 27 '16 at 17:04
@Kraimir Stoev thank you so much it works now. Sorry but do you know when the user types into the edit text how do i show that edit text onto a new activity? Thanks – 09Emi Feb 27 '16 at 18:24
Maybe this would help: http://stackoverflow.com/questions/1489852/android-handle-enter-in-an-edittext :) gl gl :) – Krasimir Stoev Feb 27 '16 at 18:53
@Kraimir Stoev Thanks, that didn't work do you have any other ideas. thanks – 09Emi Feb 28 '16 at 17:25
@Kraimir Stoev I have written my code like this but it doesn't seem to work bBasket.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Wood.setImeActionLabel("Custom text", KeyEvent.KEYCODE_ENTER); Intent intent = new Intent(Bedroom.this, Basket.class); String message = Wood.getText().toString(); intent.putExtra(EXTRA_MESSAGE, message); startActivity(intent); } }); – 09Emi Feb 28 '16 at 17:28

Rohit5k2 · Answer 2 · 2016-02-27T16:51:12.937

0

You never initialized your EditText which is causing NullPointerException

Add this

Wood = (EditText) findViewById(R.id.Wood);

inside onCreate method.

Update: This is how you can change the height and width of EditText on button Click

final LayoutParams lparams = new LayoutParams(150,50); // First param is Width and second is height
Wood.setLayoutParams(lparams);

edited Feb 27 '16 at 16:51

answered Feb 27 '16 at 16:30

Rohit5k2

17,948
8
45
57

thanks. Do you know how to change the size of the actual editText box not the text inside it, when the button is pressed. Thanks – 09Emi Feb 27 '16 at 16:48
Do you know how to save an edit text as an image so I can then call it onto the next page like an online basket? Thanks – 09Emi Feb 27 '16 at 18:37

How do i change the actual size of the edit text box depending on what button is pressed?

2 Answers2