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copied!<p>First of, the title should describe what the problem is.</p> <p>Second, what is the calculation you are talking about? Is that something say, java specific and you need only help with how the Android view system works?</p> <p>I wrote some sample code for you. It consists of an XML that shows the views and some java code.</p> <p>XML: activity_main.xml</p> <pre><code><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <EditText android:id="@+id/edit_text" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="calculate" /> <TextView android:id="@+id/text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> </code></pre> <p>Code: MainActivity</p> <pre><code>public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final EditText editText = (EditText) findViewById(R.id.edit_text); Button button = (Button) findViewById(R.id.button); final TextView textView = (TextView) findViewById(R.id.text_view); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String calculation = doCalculation(editText.getText().toString()); textView.setText(calculation); } }); } private String doCalculation(String string) { return "EditText: " + string + ", doCalculation returned the message"; } } </code></pre>

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