onclick method does not exist error?

Question

this is the description of the error

There should be no spaces in the onClick handler name The onClick attribute value should be the name of a method in this View's context to invoke when the view is clicked. This name must correspond to a public method that takes exactly one parameter of type View. Must be a string value, using '\;' to escape characters such as '\n' or '\uxxxx' for a unicode character.

btnClick = (Button) findViewById(R.id.button2);
txtBox1 = (EditText) findViewById(editText9);
txtBox2 = (EditText) findViewById(editText10);



btnClick.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        String input1 = txtBox1.getText().toString();
        byte[] bytes = input1.getBytes();
        final StringBuilder binary = new StringBuilder();
        for (byte b : bytes) {
            int val = b;
            for (int i = 0; i < 8; i++) {
                binary.append((val & 128) == 0 ? 0 : 1);
                val <<= 1;
            }
            binary.append(' ');
            txtBox2.setText(binary);
        }

btnClick = (Button) findViewById(R.id.button3);

        btnClick.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                    ClipboardManager clipboard = (ClipboardManager)              
getSystemService(Context.CLIPBOARD_SERVICE);
                String text = txtBox2.getText().toString();
                ClipData clip = ClipData.newPlainText("text", text);
                clipboard.setPrimaryClip(clip);
                Toast.makeText(getApplicationContext(), "Text Copied",
                        Toast.LENGTH_SHORT).show();

            }


        });


        txtBox2 = (EditText) findViewById(editText10);
        txtBox1 = (EditText) findViewById(editText9);
        btnClick = (Button) findViewById(R.id.button5);

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

                txtBox2.setText("");
                txtBox1.setText("");
            }
        });

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

                txtBox2.setText("");
                String s = new String(binary);
                txtBox1.setText(s);
            }
        });

One odd thing. At the end you are calling `btnClick.setOnClickListener` twice on the same `Button`. — Stephen C, Dec 09 '17 at 02:58
The problem is coming from one of your layout XML files, not the Java code. You have an `android:onClick` attribute on something, and the value you have for it can't be found as a valid method in the `Activity`. — Mike M., Dec 09 '17 at 14:10

score 0 · Answer 1 · answered Dec 09 '17 at 05:31

0

you have used same name btnClick for different 3 Button. may be this is the problem. use different name.

answered Dec 09 '17 at 05:31

Dharmishtha

1,313
10
21

score 0 · Answer 2 · answered Dec 09 '17 at 05:36

You have not closed the OnClickListener interface. Change

btnClick.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        String input1 = txtBox1.getText().toString();
        byte[] bytes = input1.getBytes();
        final StringBuilder binary = new StringBuilder();
        for (byte b : bytes) {
            int val = b;
            for (int i = 0; i < 8; i++) {
                binary.append((val & 128) == 0 ? 0 : 1);
                val <<= 1;
            }
            binary.append(' ');
            txtBox2.setText(binary);
        }

to

btnClick.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        String input1 = txtBox1.getText().toString();
        byte[] bytes = input1.getBytes();
        final StringBuilder binary = new StringBuilder();
        for (byte b : bytes) {
            int val = b;
            for (int i = 0; i < 8; i++) {
                binary.append((val & 128) == 0 ? 0 : 1);
                val <<= 1;
            }
            binary.append(' ');
            txtBox2.setText(binary);
        }
}
});

Note that I have added

} }); to your code. After this line start your next code.

I have done that but the error persists thanks for your help — Paul M Junior, Dec 09 '17 at 21:08

Lalit Verma · Answer 3 · 2017-12-09T05:45:00.723

0

Just use different Button variables for different button ids in your xml, don't use same button name to call onClick methods.
For example:

Button btnClick,btnClick1,btnClick2;

For more information please visit this link.

edited Dec 09 '17 at 05:45

answered Dec 09 '17 at 05:36

Lalit Verma

782
10
25

i have tried that but the same error still persists...thanks for your help – Paul M Junior Dec 09 '17 at 21:06

InsaneCat · Answer 4 · 2017-12-09T05:47:44.533

You need to create different buttons variables names and ids

For Example

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mContext = this;
    mActivity = this;

    btnClick1 = (Button) findViewById(R.id.button1);
    btnClick2 = (Button) findViewById(R.id.button2);
    btnClick3 = (Button) findViewById(R.id.button3);
    btnClick4 = (Button) findViewById(R.id.button4);
    txtBox1 = (EditText) findViewById(editText9);
    txtBox2 = (EditText) findViewById(editText10);


    btnClick1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String input1 = txtBox1.getText().toString();
                byte[] bytes = input1.getBytes();
                final StringBuilder binary = new StringBuilder();
                for (byte b : bytes) {
                    int val = b;
                    for (int i = 0; i < 8; i++) {
                        binary.append((val & 128) == 0 ? 0 : 1);
                        val <<= 1;
                    }
                    binary.append(' ');
                    txtBox2.setText(binary);
                }
            }
        });
        btnClick2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ClipboardManager clipboard = (ClipboardManager)
                        getSystemService(Context.CLIPBOARD_SERVICE);
                String text = txtBox2.getText().toString();
                ClipData clip = ClipData.newPlainText("text", text);
                clipboard.setPrimaryClip(clip);
                Toast.makeText(getApplicationContext(), "Text Copied",
                        Toast.LENGTH_SHORT).show();

            }
        });
        btnClick3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                txtBox2.setText("");
                txtBox1.setText("");
            }
        });
        btnClick4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                txtBox2.setText("");
                String s = new String(binary);
                txtBox1.setText(s);
            }
        });
}

Check this

Hello there i have tried thiis but the same error still persists...Thanks for helping — Paul M Junior, Dec 09 '17 at 21:06

onclick method does not exist error?

4 Answers4