Android-NullPointerException使用ViewGroup

Question

 private RMProject currentProject;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.open_proj);
    Bundle bundle = getIntent().getExtras();
    currentProject = bundle.getParcelable("current");
    TextView textView = (TextView) findViewById(R.id.label_open_project);
    textView.setText("Project "+currentProject.getName());

}

public class EventsActivity extends Activity {
private RMProject currentProject;
private ListView listView;
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    EventDBManager.init(this);
    ViewGroup contentView = (ViewGroup) getLayoutInflater().inflate(R.layout.orm_event_list, null);
    listView = (ListView) contentView.findViewById(R.id.ormListView);
    Bundle bundle = getIntent().getExtras();
    currentProject = bundle.getParcelable("current");
    TextView textView = (TextView) findViewById(R.id.ormTextView);
    //38 line - next, which cause exception
    textView.setText("Project "+currentProject.getName());
    Button btn = (Button) contentView.findViewById(R.id.ormButtonAdd);
    setupButton(btn);
    setContentView(contentView);
}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:editable="true"
        android:text="Project name"
        android:id="@+id/ormTextView"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="90dp"
        android:textSize="20dp"/>
<Button
        android:id="@+id/ormButtonAdd"
        android:layout_alignParentBottom="true"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Add " />
<ListView
        android:id="@+id/ormListView"
        android:layout_above="@id/ormButtonAdd"

        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
</RelativeLayout>

和例外情况：

Answer 1

TextView textView = (TextView) findViewById(R.id.ormTextView);

因此修复方法是将其替换为

TextView textView = (TextView) contentView .findViewById(R.id.ormTextView);

希望这有帮助