extending navigation drawer activity to other activities

Question

I\'m trying to create a navigation drawer activity so I can extend that activity and use the menu in all activities by following the answer given in this question Link but m

Answer 1

As suggested by oli, you need to call setContentView(R.layout.activity_view) in your main activity.

BaseActivity's onCreate must be called once content view in Main Activity has been set as shown below :

public class BaseActivity extends Activity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // REST Navigation drawer initialization
    }

}



public class MainActivity extends BaseActivity {

    protected void onCreate(Bundle savedInstanceState) {

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

        // REST APPLICATION CODE
    }
}

Answer 2

In the main activity you have to call super.onCreate(savedInstanceState) after setContentView()

Answer 3

In you MainActivity just put set setContentView(R.layout.activity_main) before

super.onCreate(savedInstanceState);

like below:

@Override
protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_profile);
    super.onCreate(savedInstanceState);
}

Answer 4

On the parent classBaseActivity:

• declare a protected abstract int getLayoutId();

• onCreate() I added the line

  setContentView(getLayoutId());
  

Now implement it on your subclass MainActivity something like:

 protected int getLayoutId() {
    return R.layout.activity_profile;
}

Please tell me if you know a better solution.

Answer 5

Your xml file should look something like this, taken from the android website: http://developer.android.com/training/implementing-navigation/nav-drawer.html

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- The main content view -->
    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
        <!-- Add content here -->
    </FrameLayout>

    <!-- The navigation drawer -->
    <ListView android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:background="#111"/>
</android.support.v4.widget.DrawerLayout>

Answer 6

The problem appears that the base class is not aware of the layout. Not sure how or why it worked for others without having to do something like this.. but I am new to Android.

I was getting the same error and solved by passing my layout to the base via onCreate.

So in the base, I modified onCreate to be like this:

protected void onCreate(Bundle savedInstanceState, int resLayoutID)
{
    super.onCreate(savedInstanceState);
    setContentView(resLayoutID);

Then, from my new activity, I have this:

@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState, R.layout.my_activity);

This code in my base now works instead of staying null:

drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerList = (ListView) findViewById(R.id.left_drawer);

btw, this result was suggested to me by a friend and it worked for me.