Android Design Libraryが提供する NavigationView を使用しています。いくつかのアイテムを追加したところ、パフォーマンスが非常に悪いことがわかりました。最初の起動では、最初に開くのに 1 秒ほどかかります。UI のスクリーンショットを次に示します。
関連するコードの一部を投稿してみます。
ドロワー XML
<group android:checkableBehavior="single">
<item
android:id="@+id/home"
android:checked="false"
android:icon="@drawable/ic_home"
android:title="Home" />
<item
android:id="@+id/about"
android:checked="false"
android:icon="@drawable/ic_about"
android:title="About" />
<item
android:id="@+id/gallery"
android:checked="false"
android:icon="@drawable/ic_gallery"
android:title="Gallery" />
<item
android:id="@+id/settings"
android:icon="@drawable/ic_action_settings"
android:title="Settings" />
<item
android:id="@+id/navigation_subheader"
android:title="Categories">
<menu>
<item
android:id="@+id/science"
android:checked="false"
android:icon="@drawable/ic_science"
android:title="Science" />
<item
android:id="@+id/parenting"
android:checked="false"
android:icon="@drawable/ic_parenting"
android:title="Parenting" />
<item
android:id="@+id/android"
android:checked="false"
android:icon="@drawable/ic_android"
android:title="Android" />
<item
android:id="@+id/technology"
android:checked="false"
android:icon="@drawable/ic_tech"
android:title="Technology" />
<item
android:title=""
android:checkable="false"
android:visible="false"
android:orderInCategory="200"/>
</menu>
</item>
</group>
メインアクト
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing Toolbar and setting it as the actionbar
toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);
//Initializing NavigationView
navigationView = (NavigationView) findViewById(R.id.navigation_view);
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if (menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
Log.v(TAG + "-S", "Pre_Switch = " + mCurCheckPosition);
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()) {
case R.id.home:
homeFragment();
return true;
case R.id.about:
webFragment();
return true;
case R.id.gallery:
galleryFragment();
return true;
case R.id.science:
scienceFragment();
return true;
case R.id.parenting:
parentingFragment();
return true;
case R.id.android:
androidFragment();
return true;
case R.id.technology:
technologyFragment();
return true;
case R.id.settings:
Intent i = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(i);
default:
return true;
}
}
});
// Initializing Drawer Layout and ActionBarToggle
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){
@Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessay or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
}
そして最後に、Choreographer からのログに表示されているエラーです。これが lib の単なるバグであることを願っていますが、他の誰かがこれに遭遇し、回避策があるのではないかと考えています。
I/Choreographer﹕ Skipped 117 frames! The application may be doing too much work on its main thread.
完全なソースはこちらから入手できます: https://github.com/caman9119/The_Jones_Theory