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POonCreate flow continues after finish()
 

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  1. POonCreate flow continues after finish()
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    <p>I would like to finish an activity from inside the <code>onCreate</code> method. When I call <code>finish()</code>, <code>onDestroy()</code> is not immediately called, the code keeps flowing past <code>finish()</code>. <code>onDestroy()</code> isn't called until after the <code>onCreate()</code> closing brace.</p> <p>Per the <code>onCreate()</code> description at developer.android.com/reference.</p> <blockquote> <p>You can call finish() from within this function, in which case onDestroy() will be immediately called without any of the rest of the activity lifecycle (onStart(), onResume(), onPause(), etc) executing.</p> </blockquote> <p>Reason I ask is: I would like to check data from the Bundle passed to <code>onCreate()</code>. Of course I have control of what is passed to <code>onCreate</code>, but I still think it should be checked at the point of delivery.</p> <p>My code contains class <code>A</code>, which starts Activity <code>B</code>. I believe the last two "outside of if clause" tags, shouldn't be called because the <code>finish</code> method in the <code>if</code> statement should have destroyed the activity. It has nothing to do with the if clause because the tag line after the second <code>finish()</code> call is still also read.</p> <p>My Code:</p> <p>Class A</p> <pre><code>@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // goToBButton: when pressed sends message to class B. Button goToBButton = (Button)this.findViewById(R.id.go_to__b_btn); goToBButton.setOnClickListener(new OnClickListener() { @Override public void onClick (View v) { Log.i(TAG,"A Class: goToBButton, onClick"); Intent i = new Intent(A.this, B.class); startActivityForResult(i,REQ_TO_B); } }); } // end onCreate </code></pre> <p>My Code ClassB</p> <pre><code> public class B extends Activity{ private static final String TAG = "tag"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layoutb); // set as true, should always print Tag: one line before first finish" if (true) { Log.i(TAG,"B Class: one line before 1st finish"); finish(); } // shouldn't get here after first finish Log.i(TAG,"B Class: outside of if clause, before second finish"); finish(); // shouldn't get here after second finish Log.i(TAG,"B Class: outside of if clause, after finish"); } // end onCreate @Override public void onStart () { super.onStart(); Log.i(TAG,"B Class: onStart"); } @Override public void onRestart() { super.onRestart(); Log.i(TAG,"B Class: onRestart"); } @Override public void onResume () { super.onResume(); Log.i(TAG,"B Class: onResume"); } @Override public void onPause () { super.onPause(); Log.i(TAG,"B Class: onPause"); } @Override public void onStop () { super.onStop(); Log.i(TAG,"B Class: onStop"); } @Override public void onDestroy () { super.onDestroy(); Log.i(TAG,"B Class: onDestroy"); } } // end B Class </code></pre> <p>Here are the results of my tags:</p> <blockquote> <p>11-26 15:53:40.456: INFO/tag(699): A Class: goToBButton, onClick</p> <p>11-26 15:53:40.636: INFO/tag(699): A Class: onPause</p> <p>11-26 15:53:40.865: INFO/tag(699): B Class: one line before 1st finish</p> <p>11-26 15:53:40.896: INFO/tag(699): B Class: outside of if clause, before second finish</p> <p>11-26 15:53:40.917: INFO/tag(699): B Class: outside of if clause, after finish</p> <p>11-26 15:53:41.035: INFO/tag(699): A Class: onResume</p> <p>11-26 15:53:41.165: INFO/tag(699): B Class: onDestroy</p> </blockquote>
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