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POI want to use a self made Class in android
 

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    <p>I am currently new to Android Development and i am having a difficult time trying to use a self made class in my MainActivity Android class. Let me give you an example; I created a SquareArea class and want to use it in the MainActivity Class</p> <pre><code>public class SquareArea{ private double _length; private double _width; public SquareArea(double length , double width){ _length = length; _width = width; area(); } private double area(){ return _length } } </code></pre> <p>When i instantiate the SquareClass in MainActivity class i want to be able to use the area() method and return when values that are Extracted from(EditText)<br> I want to use the value in order to place it in a text view;however this does not seem to happen.</p> <p>I can do it with methods but i want to use my own classes instead.</p> <p>Please help, I am getting frustrated with this.</p> <pre><code>///Below is my MainActivity Class/// public class MainActivity extends Activity { EditText mEditText1; EditText mEditText2; EditText mEditText3; TextView mTextView; Button mButton; Double value1, value2; SquareArea sq1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mEditText1 = (EditText) findViewById(R.id.editText1); mEditText2 = (EditText) findViewById(R.id.editText2); mEditText3 = (EditText) findViewById(R.id.editText3); mTextView = (TextView) findViewById(R.id.textView1); mEditText1.setBackgroundColor(Color.GREEN); mEditText2.setBackgroundColor(Color.GREEN); mEditText3.setBackgroundColor(Color.RED); mButton = (Button) findViewById(R.id.button1); mButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //When the button is clicked, call the calucate method. // calculate(); try { value1 = Double.parseDouble(mEditText1.getText().toString()); value2 = Double.parseDouble(mEditText2.getText().toString()); sq1 = new SquareArea(value1, value2); mTextView.setText(sq1.toString()); } catch (NumberFormatException e) { mTextView.setText("Please use numbers"); } }); } } </code></pre>
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