StackOverflow2013

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PO
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Id
15991815
data
AcceptedAnswerId
0
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0
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0
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CreationDate
2013-04-13T19:13:36.943
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0
LastActivityDate
2013-04-13T19:13:36.943
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0
OwnerUserId
1538357
ParentId
15982740
PostTypeId
2
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0
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0
LastEditorDisplayName
text
Body
I see several problems <pre><code>mTextView.setText(sq1.toString()); </code></pre> The toString method in SquareArea is not overridden. So the toString will return the default information about the object (location in memory, name, etc.) <pre><code>public SquareArea(double length , double width){ _length = length; _width = width; area(); } </code></pre> In the code above, you are inside the constructor. Why are you calling area() from here? A constructor can't return anything and the result from area() is being lost because area() returns a double. And lastly: <pre><code>private double area(){ return _length } </code></pre> This method is private. It cannot be called from outside the class/object. To make your code work this is what I would change. <pre><code>public class SquareArea{ private double _length; private double _width; public SquareArea(double length , double width){ _length = length; _width = width; } public double area(){ return _length * _width; } } ///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(String.ValueOf(sq1.area())); } catch (NumberFormatException e) { mTextView.setText("Please use numbers"); } }); } } </code></pre>
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1. This table or related slice is empty.
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1. POI want to use a self made Class in android
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1. PTAnswer
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1. This table or related slice is empty.
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1. USYarrgh
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