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copied!<p>Try this.</p> <p>You must call <code>findViewById</code> once after called the <code>setContentView</code> method.</p> <pre><code>private RadioButton RD1 private RadioButton RD2 private EditText input; private EditText output; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RD1 = (RadioButton) findViewById(R.id.ctof); RD2 = (RadioButton) findViewById(R.id.ftoc); input = (EditText) findViewById(R.id.ipdata); output = (EditText) findViewById(R.id.opdata); } </code></pre> <p>Edit this line in doconvert method.</p> <pre><code>float data = Float.parseFloat(input.getText().toString()); </code></pre> <p>Edit in your layout.</p> <pre><code><EditText android:id="@+id/ipdata" android:hint="Enter temperature" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="22dp" android:ems="10" android:inputType="number"/> <<<Add this line to force user to enter the numeric value. </code></pre> <p>Set this input type to number because user can enter anything in <code>edittext</code> like text also then <code>NumberFormatException</code> will throw on this line.</p> <pre><code>float data = Float.parseFloat(input.getText().toString()); </code></pre> <p>So you also want user should enter numeric then set the <code>android:inputType="number"</code> and last set the <code>android:onClick="doconvert"</code> in <code>button</code> in layout as @user113215 edited answer.</p>

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