我是 Android 的新手，我有一个 Android 应用程序，我在该应用程序上添加了一个“启动画面”，然后加载了 MainActivity。但是 MainActivity 需要额外的 5-6 秒来加载。
MainActivity 的内容是否有可能加载到启动画面中，并且当启动画面结束时它应该显示 MainActivity 而无需额外的 5-6 秒。
请帮帮我，我已经添加了 MainActivity 和启动画面的代码。如果您编辑我的代码并给我完美的代码，那将是您对我最大的善意。
提前致谢。
主 Activity
public class MainActivity extends AppCompatActivity implements MenuItemCallback, ConfigParser.CallBack
{
private static final int PERMISSION_REQUESTCODE = 123;
//Layout
public Toolbar mToolbar;
private TabLayout tabLayout;
private DisableableViewPager viewPager;
private NavigationView navigationView;
public DrawerLayout drawer;
private ActionBarDrawerToggle toggle;
//Adapters
private TabAdapter adapter;
private static SimpleMenu menu;
//Keep track of the interstitials we show
private int interstitialCount = -1;
private InterstitialAd mInterstitialAd;
//Data to pass to a fragment
public static String FRAGMENT_DATA = "transaction_data";
public static String FRAGMENT_CLASS = "transation_target";
//Permissions Queu
List<NavItem> queueItem;
int queueMenuItemId;
//InstanceState (rotation)
private Bundle savedInstanceState;
private static final String STATE_MENU_INDEX = "MENUITEMINDEX";
private static final String STATE_PAGER_INDEX = "VIEWPAGERPOSITION";
private static final String STATE_ACTIONS = "ACTIONS";
@Override
public void configLoaded( boolean facedException )
{
if ( facedException || menu.getFirstMenuItem() == null ) {
if ( Helper.isOnlineShowDialog( MainActivity.this ) )
Toast.makeText( this, R.string.invalid_configuration, Toast.LENGTH_LONG ).show();
} else {
if ( savedInstanceState == null ) {
menuItemClicked( menu.getFirstMenuItem(), 0, false );
} else {
ArrayList<NavItem> actions = (ArrayList<NavItem>) savedInstanceState.getSerializable( STATE_ACTIONS );
int menuItemId = savedInstanceState.getInt( STATE_MENU_INDEX );
int viewPagerPosition = savedInstanceState.getInt( STATE_PAGER_INDEX );
menuItemClicked( actions, menuItemId, false );
viewPager.setCurrentItem( viewPagerPosition );
}
}
}
@Override
public void onCreate( Bundle savedInstanceState )
{
super.onCreate( savedInstanceState );
this.savedInstanceState = savedInstanceState;
//Load the appropriate layout
if ( useTabletMenu() ) {
setContentView( R.layout.activity_main_tablet );
Helper.setStatusBarColor( MainActivity.this,
ContextCompat.getColor( this, R.color.myPrimaryDarkColor ) );
} else {
setContentView( R.layout.activity_main );
}
mToolbar = findViewById( R.id.toolbar );
setSupportActionBar( mToolbar );
if ( !useTabletMenu() )
getSupportActionBar().setDisplayShowHomeEnabled( true );
else {
getSupportActionBar().setDisplayShowHomeEnabled( false );
}
if ( Config.HIDE_TOOLBAR ) {
getSupportActionBar().hide();
}
//Drawer
if ( !useTabletMenu() ) {
drawer = findViewById( R.id.drawer );
toggle = new ActionBarDrawerToggle(
this, drawer, mToolbar, R.string.drawer_open, R.string.drawer_close );
drawer.setDrawerListener( toggle );
toggle.syncState();
}
//Layouts
tabLayout = findViewById( R.id.tabs );
viewPager = findViewById( R.id.viewpager );
//Check if we should open a fragment based on the arguments we have
if ( getIntent().getExtras() != null && getIntent().getExtras().containsKey( FRAGMENT_CLASS ) ) {
try {
Class<? extends Fragment> fragmentClass = (Class<? extends Fragment>) getIntent().getExtras().getSerializable( FRAGMENT_CLASS );
if ( fragmentClass != null ) {
String[] extra = getIntent().getExtras().getStringArray( FRAGMENT_DATA );
HolderActivity.startActivity( this, fragmentClass, extra );
finish();
//Optionally, we can also point intents to holderactivity directly instead of MainAc.
}
} catch ( Exception e ) {
//If we come across any errors, just continue and open the default fragment
Log.printStackTrace( e );
}
}
//Menu items
navigationView = findViewById( R.id.nav_view );
menu = new SimpleMenu( navigationView.getMenu(), this );
if ( Config.USE_HARDCODED_CONFIG ) {
Config.configureMenu( menu, this );
} else if ( !Config.CONFIG_URL.isEmpty() && Config.CONFIG_URL.contains( "http" ) )
new ConfigParser( Config.CONFIG_URL, menu, this, this ).execute();
else
new ConfigParser( "config.json", menu, this, this ).execute();
tabLayout.setupWithViewPager( viewPager );
if ( !useTabletMenu() ) {
drawer.setStatusBarBackgroundColor(
ContextCompat.getColor( this, R.color.myPrimaryDarkColor ) );
}
applyDrawerLocks();
//Ads
Helper.admobLoader( this, findViewById( R.id.adView ) );
if ( getResources().getString( R.string.admob_interstitial_id ).length() > 0
&& Config.INTERSTITIAL_INTERVAL > 0
&& !SettingsFragment.getIsPurchased( this ) ) {
mInterstitialAd = new InterstitialAd( this );
mInterstitialAd.setAdUnitId( getResources().getString( R.string.admob_interstitial_id ) );
AdRequest adRequestInter = new AdRequest.Builder().addTestDevice( AdRequest.DEVICE_ID_EMULATOR ).build();
mInterstitialAd.loadAd( adRequestInter );
mInterstitialAd.setAdListener( new AdListener()
{
@Override
public void onAdClosed()
{
// Load the next interstitial.
mInterstitialAd.loadAd( new AdRequest.Builder().addTestDevice( AdRequest.DEVICE_ID_EMULATOR ).build() );
}
} );
}
Helper.updateAndroidSecurityProvider( this );
viewPager.addOnPageChangeListener( new ViewPager.OnPageChangeListener()
{
public void onPageScrollStateChanged( int state )
{
}
public void onPageScrolled( int position, float positionOffset, int positionOffsetPixels )
{
}
public void onPageSelected( int position )
{
onTabBecomesActive( position );
}
} );
}
@SuppressLint("NewApi")
@Override
public void onRequestPermissionsResult( int requestCode, String[] permissions, int[] grantResults )
{
switch ( requestCode ) {
case PERMISSION_REQUESTCODE:
boolean allGranted = true;
for ( int grantResult : grantResults ) {
if ( grantResult != PackageManager.PERMISSION_GRANTED ) {
allGranted = false;
}
}
if ( allGranted ) {
//Retry to open the menu item
menuItemClicked( queueItem, queueMenuItemId, false );
} else {
// Permission Denied
Toast.makeText( MainActivity.this, getResources().getString( R.string.permissions_required ), Toast.LENGTH_SHORT )
.show();
}
break;
default:
super.onRequestPermissionsResult( requestCode, permissions, grantResults );
}
}
@Override
public void menuItemClicked( List<NavItem> actions, int menuItemIndex, boolean requiresPurchase )
{
// Checking the drawer should be open on start
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences( getBaseContext() );
boolean openOnStart = Config.DRAWER_OPEN_START || prefs.getBoolean( "menuOpenOnStart", false );
if ( drawer != null ) {
boolean firstClick = ( savedInstanceState == null && adapter == null );
if ( openOnStart && !useTabletMenu() && firstClick ) {
drawer.openDrawer( GravityCompat.START );
} else {
//Close the drawer
drawer.closeDrawer( GravityCompat.START );
}
}
//Check if the user is allowed to open item
if ( requiresPurchase && !isPurchased() ) return; //isPurchased will handle this.
if ( !checkPermissionsHandleIfNeeded( actions, menuItemIndex ) )
return; //checkPermissions will handle.
if ( isCustomIntent( actions ) ) return;
//Uncheck all other items, check the current item
for ( MenuItem menuItem : menu.getMenuItems() ) {
if ( menuItem.getItemId() == menuItemIndex ) {
menuItem.setChecked( true );
} else
menuItem.setChecked( false );
}
//Load the new tab
adapter = new TabAdapter( getSupportFragmentManager(), actions, this );
viewPager.setAdapter( adapter );
//Show or hide the tab bar depending on if we need it
if ( actions.size() == 1 ) {
tabLayout.setVisibility( View.GONE );
viewPager.setPagingEnabled( false );
} else {
tabLayout.setVisibility( View.VISIBLE );
viewPager.setPagingEnabled( true );
}
( (CustomAppBarLayout) mToolbar.getParent() ).setExpanded( true, true );
//Show in interstitial
showInterstitial();
onTabBecomesActive( 0 );
}
private void onTabBecomesActive( int position )
{
Fragment fragment = adapter.getItem( position );
//If fragment does not support collapse, or if OS does not support collapse, disable collapsing toolbar
if ( ( fragment instanceof CollapseControllingFragment
&& !( (CollapseControllingFragment) fragment ).supportsCollapse() )
||
( android.os.Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT ) )
lockAppBar();
else
unlockAppBar();
if ( position != 0 )
showInterstitial();
}
/**
* Show an interstitial ad
*/
public void showInterstitial()
{
if ( interstitialCount == ( Config.INTERSTITIAL_INTERVAL - 1 ) ) {
if ( mInterstitialAd != null && mInterstitialAd.isLoaded() ) {
mInterstitialAd.show();
}
interstitialCount = 0;
} else {
interstitialCount++;
}
}
/**
* Checks if the item is/contains a custom intent, and if that the case it will handle it.
*
* @param items List of NavigationItems
* @return True if the item is a custom intent, in that case
*/
private boolean isCustomIntent( List<NavItem> items )
{
NavItem customIntentItem = null;
for ( NavItem item : items ) {
if ( CustomIntent.class.isAssignableFrom( item.getFragment() ) ) {
customIntentItem = item;
}
}
if ( customIntentItem == null ) return false;
if ( items.size() > 1 )
Log.e( "INFO", "Custom Intent Item must be only child of menu item! Ignorning all other tabs" );
CustomIntent.performIntent( MainActivity.this, customIntentItem.getData() );
return true;
}
/**
* If the item can be opened because it either has been purchased or does not require a purchase to show.
*
* @return true if the app is purchased. False if the app hasn't been purchased, or if iaps are disabled
*/
private boolean isPurchased()
{
String license = getResources().getString( R.string.google_play_license );
// if item does not require purchase, or app has purchased, or license is null/empty (app has no in app purchases)
if ( !SettingsFragment.getIsPurchased( this ) && !license.equals( "" ) ) {
String[] extra = new String[]{ SettingsFragment.SHOW_DIALOG };
HolderActivity.startActivity( this, SettingsFragment.class, extra );
return false;
}
return true;
}
/**
* Checks if the item can be opened because it has sufficient permissions.
*
* @param tabs The tabs to check
* @return true if the item is safe to open
*/
private boolean checkPermissionsHandleIfNeeded( List<NavItem> tabs, int menuItemId )
{
if ( android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M ) return true;
List<String> allPermissions = new ArrayList<>();
for ( NavItem tab : tabs ) {
if ( PermissionsFragment.class.isAssignableFrom( tab.getFragment() ) ) {
try {
for ( String permission : ( (PermissionsFragment) tab.getFragment().newInstance() ).requiredPermissions() ) {
if ( !allPermissions.contains( permission ) )
allPermissions.add( permission );
}
} catch ( Exception e ) {
//Don't really care
}
}
}
if ( allPermissions.size() > 1 ) {
boolean allGranted = true;
for ( String permission : allPermissions ) {
if ( checkSelfPermission( permission ) != PackageManager.PERMISSION_GRANTED )
allGranted = false;
}
if ( !allGranted ) {
requestPermissions( allPermissions.toArray( new String[ 0 ] ), PERMISSION_REQUESTCODE );
queueItem = tabs;
queueMenuItemId = menuItemId;
return false;
}
return true;
}
return true;
}
@Override
public boolean onCreateOptionsMenu( Menu menu )
{
MenuInflater inflater = getMenuInflater();
inflater.inflate( R.menu.settings_menu, menu );
return true;
}
@Override
public boolean onOptionsItemSelected( MenuItem item )
{
// Handle item selection
switch ( item.getItemId() ) {
case R.id.settings:
HolderActivity.startActivity( this, SettingsFragment.class, null );
return true;
case R.id.favorites:
HolderActivity.startActivity( this, FavFragment.class, null );
return true;
default:
return super.onOptionsItemSelected( item );
}
}
@Override
public void onBackPressed()
{
Fragment activeFragment = null;
if ( adapter != null )
activeFragment = adapter.getCurrentFragment();
if ( drawer != null && drawer.isDrawerOpen( GravityCompat.START ) ) {
drawer.closeDrawer( GravityCompat.START );
} else if ( activeFragment instanceof BackPressFragment ) {
boolean handled = ( (BackPressFragment) activeFragment ).handleBackPress();
if ( !handled ) {
super.onBackPressed();
}
} else {
super.onBackPressed();
}
}
@Override
protected void onActivityResult( int requestCode, int resultCode, Intent data )
{
super.onActivityResult( requestCode, resultCode, data );
List<Fragment> fragments = getSupportFragmentManager().getFragments();
if ( fragments != null )
for ( Fragment frag : fragments )
if ( frag != null )
frag.onActivityResult( requestCode, resultCode, data );
}
@Override
public void onConfigurationChanged( Configuration newConfig )
{
super.onConfigurationChanged( newConfig );
if ( adapter != null && !( adapter.getCurrentFragment() instanceof ConfigurationChangeFragment ) ) {
this.recreate();
}
}
@Override
protected void onSaveInstanceState( Bundle outState )
{
super.onSaveInstanceState( outState );
if ( adapter == null ) return;
int menuItemIndex = 0;
for ( MenuItem menuItem : menu.getMenuItems() ) {
if ( menuItem.isChecked() ) {
menuItemIndex = menuItem.getItemId();
break;
}
}
outState.putSerializable( STATE_ACTIONS, ( (ArrayList<NavItem>) adapter.getActions() ) );
outState.putInt( STATE_MENU_INDEX, menuItemIndex );
outState.putInt( STATE_PAGER_INDEX, viewPager.getCurrentItem() );
}
//Check if we should adjust our layouts for tablets
public boolean useTabletMenu()
{
return ( getResources().getBoolean( R.bool.isWideTablet ) && Config.TABLET_LAYOUT );
}
//Apply the appropiate locks to the drawer
public void applyDrawerLocks()
{
if ( drawer == null ) {
if ( Config.HIDE_DRAWER )
navigationView.setVisibility( View.GONE );
return;
}
if ( Config.HIDE_DRAWER ) {
toggle.setDrawerIndicatorEnabled( false );
drawer.setDrawerLockMode( DrawerLayout.LOCK_MODE_LOCKED_CLOSED );
} else {
drawer.setDrawerLockMode( DrawerLayout.LOCK_MODE_UNLOCKED );
}
}
private void lockAppBar()
{
AppBarLayout.LayoutParams params =
(AppBarLayout.LayoutParams) mToolbar.getLayoutParams();
params.setScrollFlags( 0 );
}
private void unlockAppBar()
{
AppBarLayout.LayoutParams params =
(AppBarLayout.LayoutParams) mToolbar.getLayoutParams();
params.setScrollFlags( AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
| AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS );
}
}
启动画面
public class SplashScreen extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
}
最佳答案
use this code inside the splashActivity
public class SplashScreen extends AppCompatActivity {
private static int SPLASH_TIME_OUT=5000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(R.style.AppTheme);
setContentView(R.layout.activity_splash_screen);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
SplashScreen.this.startActivity(new Intent(SplashScreen.this,MainActivity.class));
SplashScreen.this.finish();
finish();
}
},SPLASH_TIME_OUT);
}
}
关于java - MainActivity 应在启动画面期间加载，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52116292/