Actually I know i am asking about the simple and basic concept of Android. But I am a little bit confused about these finish() and onDestroy() methods.
Whether this will kill the activity and free the resources associated with these activity?
I tried with a simple application which contains only one activity. I thought the concept is like When the application runs, the activity will start. and when we click on back button, it will finish. And I gave some toast message inside each life cycle methods for knowing the memory usage . And when I clicked on the back button it executed onPause(), onStop(), and onDestroy(). I thought this activity finished. But when i relaunched the application again, then it took more memory than the previous time. This happens every time when I run the app from eclipse or relaunch the application from home screen.
Why is it happening? How can i actually destroy the application / activity to free the memory?
I am including my code. I just give only one toast message inside the class. Then also memory usage is increasing.
Each time when I run the application the allocated size is increasing like : 3302744, 3442384, 3474552
public class myActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Toast.makeText(getBaseContext()," allocated size = " + Debug.getNativeHeapAllocatedSize(), 1).show();
}
}
manifest:
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".myActivity "
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Why is the memory increasing every time?