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POReason behind android app crashes when button is clicked
 

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    <p>I'm trying to make an app which creates an object and saves it in a TreeSet but when I press the button the app crashes. I need help</p> <p>MainActivity is as below:</p> <pre><code>public class MainActivity extends Activity { private TreeSet&lt;Variable&gt; arbreDeVariables = new TreeSet&lt;Variable&gt;(); protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); creeUneVariable(); } private void creeUneVariable() { Button boutonEnvoyer = (Button)findViewById(R.id.button1); boutonEnvoyer.setOnClickListener(new OnClickListener(){ public void onClick(View v) { Variable variable = new Variable(getUsername(), getPassword()); arbreDeVariables.add(variable); } }); } private String getUsername(){ final EditText username = (EditText)findViewById(R.id.editText1); return username.getText().toString(); } private String getPassword(){ final EditText password = (EditText)findViewById(R.id.editText2); return password.getText().toString(); } } </code></pre> <p>"Variable" class is as below:</p> <pre><code>public class Variable { private String username; private String password; public Variable(String username,String password){ this.username = username; this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String toString(){ return "Username: "+username+" Password: "+password; } </code></pre> <p>}</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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