Good day. I use the MaterialDrawer library to display the side pull-out menu. It is required to add a button in the header menu. Tried it like this: added a button to drawer_header.xml :

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:adjustViewBounds="true" android:orientation="vertical" android:scaleType="fitCenter" android:src="@drawable/header" android:id="@+id/imageView" > </ImageView> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="plus" android:id="@+id/button_size_plus" android:layout_gravity="right" android:layout_alignBottom="@+id/imageView" /> </RelativeLayout>

Then, as usual, I declare a button in MainActivity : Button button_size_plus; and then initialize it to onCreate : button_size_plus = (Button)findViewById(R.id.button_size_plus); . Next, I create a setOnClickListener listener for the button and then when I start the application I get crash with NPE, it means that I had incorrectly initialized the button and could not “reach” it in MaterialDrawer. Please tell me how to do it correctly. I will attach an example of initializing a single field (line) in MaterialDrawer and creating the object itself:

 PrimaryDrawerItem item1 = new PrimaryDrawerItem().withIdentifier(22).withName(R.string.about_name).withSelectable(false).withIcon(R.drawable.about); result = new DrawerBuilder() .withActivity(this) .withToolbar(toolbar) .withHeader(R.layout.drawer_header) .withTranslucentStatusBar(true) .withActionBarDrawerToggleAnimated(true) .addDrawerItems( item1 ) .withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() { @Override public boolean onItemClick(View view, int position, IDrawerItem drawerItem) { } return true; } }) .build();

UPD

 View viewInHeader = result.getDrawerLayout().findViewById(R.id.button_size_plus); viewInHeader.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getBaseContext(), "header", Toast.LENGTH_SHORT).show(); } });

    1 answer 1

    1. We drive into Google

    mikepenz / MaterialDrawer get header view

    1. we go on the first link to issues the link to gitHub brought by you

    2. we read it, we look at an example from the library's README, and we understand that we need to look for the view in the object returned when creating a drover, something like this:

       Drawer result = new DrawerBuilder() .withActivity(this) ... .build(); View viewInHeader = result.getHeader().findViewById(...);
    • Updated the first post. I did everything as you indicated, it still crashes on the line viewInHeader.setOnClickListener(new View.OnClickListener() { with NullPointerException - Pollux
    • Try this: result.getHeader (). FindViewById (...); - Yuriy SPb ♦
    • Thanks a lot! Very helpful! - Pollux