我使用下面的code在我的ListActivity

I am using following code in my ListActivity

// a separate class in project
public class MyActivity extends ListActivity {
    // some common functions here..
}

public class SelectLocation extends MyListActivity {

    public void onCreate(Bundle savedInstance) {
        // here.....
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (adap != null) adap = null;
        if (list != null) list = null;
        System.gc();
    }
}

任何一个指导我为什么的onDestroy 方法不叫我的code？

any one guide me why onDestroy method is not called in my code?

推荐答案

的onDestroy（）被称为只有当系统资源不足（内存，CPU时间等），并作出决定杀死你的活动/应用程序或当有人呼叫完成（）您的活动。

onDestroy() is called only when system is low on resources(memory, cpu time and so on) and makes a decision to kill your activity/application or when somebody calls finish() on your activity.

所以，来测试你的code（），你可以做一个测试按钮，将调用完成（）您的活动。

So, to test your code() you can make a test button, that will call finish() on your activity.

了解更多here.

另外，我相信你并不需要调用所有这些东西在的onDestroy（）直到ADAP不是关键资源。即使在这种情况下，Android系统有机制妥善处置他们。

Also, I believe you don't need to call all this stuff in onDestroy() until adap is not a critical resource. And even in that case android system has mechanisms to properly dispose them.