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POWhy it is not performing the maths in this case?
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copied!<p>I have a strange situation I am faced with. This should be a unit converter but it always puts in the textview the input from the edittext without performing the maths. The test is to operate a conversion from the number in the edittext and to report the result in the text of the textview. Now it displays in the textview what I wrote in edittext. Thank you for your time.</p> <pre><code>entepublic class lunghezze extends Activity implements OnClickListener { EditText et1; TextView tv1; Spinner spinner1,spinner2; Button btnAdd; String oper = ""; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.converter); spinner1 = (Spinner) findViewById(R.id.spinner1); spinner2 = (Spinner) findViewById(R.id.spinner2); ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(this,R.array.lunghezza, android.R.layout.simple_spinner_item); adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner1.setAdapter(adapter1); ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this,R.array.lunghezza, android.R.layout.simple_spinner_item); adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner2.setAdapter(adapter2); // find the elements et1 = (EditText) findViewById(R.id.editText1); btnAdd = (Button) findViewById(R.id.button1); tv1 = (TextView) findViewById(R.id.textView4); // set a listener btnAdd.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub double num1 = 0; double resdelta = 0; double res = 0; double resx2 = 0; if (TextUtils.isEmpty(et1.getText().toString())) { return; } String a = et1.getText().toString().trim(); num1 = a.isEmpty()? Double.NaN:Double.parseDouble(a); switch (v.getId()) { case R.id.button1: String s1 = spinner1.getSelectedItem().toString(); String s2 = spinner2.getSelectedItem().toString(); if (s1+s2.equals( "IardeIarde") != null){ res=num1; } else if (s1+s2.equals( "IardeLeghe") != null){ res= 0.0005*num1; } else if (s1+s2.equals( "IardeMetri") != null){ res= 0.91*num1; tv1.setText("" + res); } else if (s1+s2.equals( "IardeMiglia terrestri") != null){ res= 0.0005*num1; tv1.setText("" + res); } else if (s1+s2.equals( "IardePollici") != null){ res= 36*num1; tv1.setText("" + res); } else if (s1+s2.equals( "LegheIarde") != null){ res= 5280*num1; tv1.setText("" + res); } else if (s1+s2.equals( "LegheLeghe") != null){ res=num1; } else if (s1+s2.equals( "LegheMetri") != null){ res= 4828*num1; tv1.setText("" + res); } else if (s1+s2.equals( "LegheMiglia terrestri") != null){ res= 3*num1; tv1.setText("" + res); } else if (s1+s2.equals( "LeghePollici") != null){ res= 190080*num1; tv1.setText("" + res); } else if (s1+s2.equals( "MetriIarde") != null){ res= 1.02*num1; tv1.setText("" + res); } else if (s1+s2.equals( "MetriLeghe") != null){ res= 0.0002*num1; tv1.setText("" + res); } else if (s1+s2.equals( "MetriMetri") != null){ res=num1; } else if (s1+s2.equals( "MetriMiglia terrestri") != null){ res= 0.0006*num1; tv1.setText("" + res); } else if (s1+s2.equals( "MetriPollici") != null){ res= 39.3*num1; tv1.setText("" + res); } else if (s1+s2.equals( "Miglia terrestriIarde") != null){ res= 1760*num1; tv1.setText("" + res); } else if (s1+s2.equals( "Miglia terrestriLeghe") != null){ res= 0.33*num1; tv1.setText("" + res); } else if (s1+s2.equals( "Miglia terrestriMetri") != null){ res= 1609.3*num1; tv1.setText("" + res); } else if (s1+s2.equals( "Miglia terrestriMiglia terrestri") != null){ res=num1; } else if (s1+s2.equals( "Miglia terrestriPollici") != null){ res= 63360*num1; tv1.setText("" + res); } else if (s1+s2.equals( "PolliciIarde") != null){ res= 0.027*num1; tv1.setText("" + res); } else if (s1+s2.equals( "PolliciLeghe") != null){ res= 0.0000052*num1; tv1.setText("" + res); } else if (s1+s2.equals( "PolliciMetri") != null){ res= 0.0254*num1; tv1.setText("" + res); } else if (s1+s2.equals( "PolliciMiglia terrestri") != null){ res= 0.000015*num1; tv1.setText("" + res); } else if (s1+s2.equals( "PolliciPollici") != null){ res=num1; } else { } break; default: break; } tv1.setText("" + res); } } </code></pre>

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