FATAL EXCEPTION: main android java

问题

I want to populate listview through adapter using array like below:

public class ChildActivity extends ActionBarActivity implements GetChildList {

    private ListView lv_child;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_child);

        List<String> array = new ArrayList<String>();   // for e.g array ["num1", "num2"]
        lv_child = (ListView)findViewById(R.id.lv_child); 
        ArrayAdapter<String> adapterChild = new ArrayAdapter<String>(ChildActivity.this,  android.R.layout.simple_list_item_1,array);
        lv_child.setAdapter(adapterChild);

}
}

And its working fine but i am using the above the same code in another activity like below:

public class EmpListActivity extends ActionBarActivity implements GetEmployeeList {


    private ListView lv_employeeName;
        @Override
        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_child);

            List<String> array = new ArrayList<String>();   // for e.g array ["num3", "num4"]
            lv_employeeName = (ListView)findViewById(R.id.lv_child); 
            ArrayAdapter<String> adapterEmployee= new ArrayAdapter<String>(EmpListActivity .this,  android.R.layout.simple_list_item_1,array);
            lv_employeeName.setAdapter(adapterEmployee);

    }
    }

And in this activity I am getting below exceptions at this line ArrayAdapter<String> adapterEmployee= new ArrayAdapter<String>(ChildActivity.this, android.R.layout.simple_list_item_1,array);

FATAL EXCEPTION: main and java.lang.NullPointerException

And also I want to ask, is there any problem for using the same simple_list_item_1 in the adapter parameter in both activity.

Kindly suggest me, waiting for reply.

Thanks

来源：https://stackoverflow.com/questions/27249535/fatal-exception-main-android-java