Reset/Clear button in Android

Question

I need a reset button that reset all the editText boxes on click to the initial state. at the moment i have this:

    main_xml
    <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/ClearButton"
    android:id="@+id/ClearButton"
    android:onClick="clear"/>

java

     public void clear(View v) {
        TextBox1.setText("0.0");
        TextBox2.setText("0.0");
    }

i am not very happy with this reset because i have on startup 0.0 in the editText boxes anyway. i would like to implement the reset somewhere here:

   input3 = String.valueOf(TextBox1.getText());
    flowRate.setOnFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if ((hasFocus)&&(input3.equals("0.0") || input3.equals(""))) {
                TextBox1.setText("");
            }
            input3 = (String.valueOf(TextBox1.getText()));
            if ((!hasFocus) && (input3.equals(""))){
                TextBox1.setText("0.0");
            }
        }
    });
    // remove on touch the value entries in the Flow rate field to start calculation
    // if no value is entered the field will return to his normal state (0.0)
    input2 = String.valueOf(TextBox2.getText());
    TextBox2.setOnFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if ((hasFocus)&&(input2.equals("0.0") || input2.equals(""))) {
                TextBox2.setText("");
            }
            input2 = (String.valueOf(TextBox2.getText()));
            if ((!hasFocus) && (input2.equals(""))){
                TextBox2.setText("0.0");
            }
        }
    });

at the moment when i reset and my focus is on a editText Box i have to delete the 0.0 first before i can write a value in the box. i would like on reset that the focus come out the editText box and everything is on the initial state.

create any method for eg. `reset()`, now set values you want to your edittexts in that method, now call it from any where but make sure that call is from mainthread. — karan, Jul 29 '15 at 11:48

Lennon Spirlandelli · Accepted Answer · 2015-07-29T20:35:41.877

To the focus come out from editbox, you just have to use clearFocus().

TextBox1.clearFocus();
TextBox2.clearFocus();

Here is my code

public class MainActivity extends AppCompatActivity {
String input1, input2, input3;
EditText tankVolume, fillingPressure, flowRate;
TextView fillingTime;
Button calculate, ClearButton;


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

    tankVolume=(EditText)findViewById(R.id.tankVolume);
    fillingPressure=(EditText)findViewById(R.id.fillingPressure);
    flowRate=(EditText)findViewById(R.id.flowRate);
    fillingTime=(TextView)findViewById(R.id.fillingTime);
    calculate=(Button)findViewById(R.id.calculate);

    // remove on touch the value entries in the Flow rate field to start calculation
    // if no value is entered the field will return to his normal state (0.0)
    input3 = String.valueOf(flowRate.getText());
    flowRate.setOnFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if ((hasFocus)&&(input3.equals("0.0") || input3.equals(""))) {
                flowRate.setText("");
            }
            input3 = (String.valueOf(flowRate.getText()));
            if ((!hasFocus) && (input3.equals(""))){
                flowRate.setText("0.0");
            }
        }
    });
    // remove on touch the value entries in the Flow rate field to start calculation
    // if no value is entered the field will return to his normal state (0.0)
    input2 = String.valueOf(fillingPressure.getText());
    fillingPressure.setOnFocusChangeListener(new View.OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if ((hasFocus)&&(input2.equals("0.0") || input2.equals(""))) {
                fillingPressure.setText("");
            }
            input2 = (String.valueOf(fillingPressure.getText()));
            if ((!hasFocus) && (input2.equals(""))){
                fillingPressure.setText("0.0");
            }
        }
    });
     // remove on touch the value entries in the Flow rate field to start calculation
    // if no value is entered the field will return to his normal state (0.0)
    input1 = String.valueOf(tankVolume.getText());
    tankVolume.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if ((hasFocus)&&(input1.equals("0.0") || input1.equals(""))) {
                tankVolume.setText("");
            }
            input1 = (String.valueOf(tankVolume.getText()));
            if ((!hasFocus) && (input1.equals(""))){
                tankVolume.setText("0.0");
            }

        }
    });

    // calculate the filling time
    calculate.setOnClickListener(new Button.OnClickListener()

    {
        public void onClick
                (View v) {
            calculate();
        }
    });
}

private void calculate()
{

    Double value1 = Double.parseDouble(tankVolume.getText().toString());
    Double value2 = Double.parseDouble(fillingPressure.getText().toString());
    Double value3 = Double.parseDouble(flowRate.getText().toString());
    Double calculatedValue = (value1*value2)/value3;


    fillingTime.setText(calculatedValue.toString());
}



    // reset everything to zero
    public void clear(View v) {
        tankVolume.setText("0.0");
        fillingPressure.setText("0.0");
        flowRate.setText("0.0");
        fillingTime.setText("0");
        tankVolume.clearFocus();
        fillingPressure.clearFocus();
        flowRate.clearFocus();
    }

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

EDIT

In your case you should use hints in xml such as

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="0.0"/>

Then you can only use setText("") for each TextView into your clear() method, and remove the all setOnFocusChangeListener, because it will no longer be used.

the problem now is on clearFocus my keyboard is switching from numeric to qwerty keyboard and on focus it switches back. — Pascal Westrich, Jul 29 '15 at 13:05
Where exactly are you trying to clear the focus of both `EditText`? — Lennon Spirlandelli, Jul 29 '15 at 15:16
i edit your text and applied my code. //set everything to zero - is the location — Pascal Westrich, Jul 29 '15 at 19:51
is it possible to reset the whole activity to its original state on clickButton? thats maybe less difficult. — Pascal Westrich, Jul 29 '15 at 20:01
Taking a look your code, I suppose you need to use hints, like the answer below. I'm editing my answer in order to show you the best way to do so. — Lennon Spirlandelli, Jul 29 '15 at 20:25
Thank you very much for your answer. I use hints in my EditText. Under the 0.0 in the EditText for fillingPressure, i putt the hint "bar", in EditText for flowRate i putt the hint" l/min" and so on. the 0.0 is just a overlay and if i click in the editText box the 0.0 disappears and the hint is viewable until number input. after the calculation i would like to reset without focus to any EditText box and show the 0.0 again like on the initial start of the calculation. everything is working, the problem is when i clear Focus the keyboard change to qwerty and not stay on numeric. — Pascal Westrich, Jul 29 '15 at 21:44
Using hints, you no longer need to clear focus. You just have to set `""` into all editTexts to clear the fields. Remove all `setOnFocusChangeListener ` and `clearFocus` you are using. — Lennon Spirlandelli, Jul 30 '15 at 14:03

score -1 · Answer 2 · edited Jul 29 '15 at 17:37

-1

Change from

public void clear(View v) {
        TextBox1.setText("0.0");
        TextBox2.setText("0.0");
    }

to

public void clear(View v) {
        TextBox1.setHint("0.0");
        TextBox2.setHint("0.0");
    }

It might help you.

edited Jul 29 '15 at 17:37

André Schild

4,592
5
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42

answered Jul 29 '15 at 15:25

Deepak Goyal

4,747
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21
46

You usually use `setHint` in `onCreate()` or in `xml`, not into "clearing" methods. – Lennon Spirlandelli Jul 29 '15 at 20:16
if you already add hint in your xml file, then when you set the empty text to edittext it will already show you hint. – Deepak Goyal Jul 29 '15 at 20:18
Yes, for this reason your answer above hasn't sense in that case. – Lennon Spirlandelli Jul 29 '15 at 20:22
Your problem "when i reset and my focus is on a editText Box i have to delete the 0.0 first before i can write a value in the box." By hint, you don't have to clear focus from edittext.... Thats why i suggest you for this. Anyway, its your decision what you want. – Deepak Goyal Jul 29 '15 at 20:24
lol there was a misunderstood, that was not my question. I just posted an answer lol – Lennon Spirlandelli Jul 29 '15 at 20:27

Reset/Clear button in Android

2 Answers2