好吧,我的应用程序上有一个闪屏。我想知道是否有一种方法可以让我只在应用程序打开的第一个初始时间出现(或者如果他们强行关闭它等等),那么如果他们按下后退键,它就不会带他们去启动画面。
我可以这么做,所以用户不能只通过输入finish()来回到启动画面,虽然我现在无法记住它,但我可以在只加载一次的地方。一旦我调用finish(),重新进入应用程序时会重新出现。有什么方法可以解决这个问题吗?
答案 0 :(得分:3)
是的,您可以通过finish()
的{{1}}方法拨打onPause
来执行此操作。
或者另一种方法是在splashActivity
的{{1}}上添加android:noHistory="true"
答案 1 :(得分:0)
使用SplashScreenActivity
你会浪费时间,因为他们在继续之前暂停初始化2-3秒。
我更喜欢在Splash Screen Layout
之上添加main_activity.xml
。我通过扩展Application来检测应用程序的第一次启动。如果它是第一次启动,我会在后台构建UI时显示我的Splash-Screen ...(如果ProgressBar滞后,请使用后台线程!)
//Extend Application to save the value. You could also use getter/setter for this instead of Shared Preferences...
public class YourApplication extends Application {
public static final String YOUR_APP_STARTUP = "APP_FIRST_START";
@Override
public void onCreate() {
super.onCreate();
//set SharedPreference value to true
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor = mPreferences.edit();
editor.putBoolean(YOUR_APP_STARTUP, true);
editor.apply();
...
}
检查MainActivity
public class YourMainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//hide actionbar and other menu which could overlay the splash screen
getActionBar().hide();
setContentView(R.layout.activity_main);
Boolean firstStart = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getBoolean(TVApplication.YOUR_APP_STARTUP, true);
if (firstStart) {
//First app start, show splash screen an hide it after 5000ms
final RelativeLayout mSplashScreen = (RelativeLayout) findViewById(R.id.splash_screen);
mSplashScreen.setVisibility(View.VISIBLE);
mSplashScreen.setAlpha(1.0f);
final FrameLayout mFrame = (FrameLayout) findViewById(R.id.frame_container);
mFrame.setAlpha(0.0f);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
Animation fadeOutAnimation = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.fade_out_animation);
fadeOutAnimation.setDuration(500);
fadeOutAnimation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
mFrame.setAlpha(1.0f);
getActionBar().show();
}
@Override
public void onAnimationEnd(Animation animation) {
mSplashScreen.setVisibility(View.GONE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
mSplashScreen.startAnimation(fadeOutAnimation);
}
}, 5000); //<-- time of Splash Screen shown
} else {
((RelativeLayout) findViewById(R.id.splash_screen)).setVisibility(View.GONE);
getActionBar().show();
}
将SplashScreen插入main.xml的顶部。我更喜欢RelativeLayout
。在示例中,SplashScreen被放置在Navitgation Drawer
的布局上,我们真的很喜欢,不是吗?
//main_activity.xml
<?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" >
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<!-- The main content view -->
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- The navigation drawer list -->
<ListView
android:id="@+id/slider_list"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_gravity="start"
android:background="@color/tvtv_background"
android:choiceMode="singleChoice"
android:divider="@drawable/nav_bar_divider"
android:dividerHeight="1dp"
android:listSelector="@android:color/transparent" />
</android.support.v4.widget.DrawerLayout>
<RelativeLayout
android:id="@+id/splash_screen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:background="@color/tvtv_white"
android:visibility="visible" >
<ImageView
android:id="@+id/splash_screen_logo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:paddingLeft="50dp"
android:paddingRight="50dp"
android:scaleType="fitCenter"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/splash_screen_text"
style="@style/TVTextBlueContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/splash_screen_logo"
android:layout_centerHorizontal="true"
android:padding="10dp"
android:text="Awesome splash shiat" />
<ProgressBar
android:id="@+id/splash_screen_loader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/splash_screen_text"
android:layout_centerHorizontal="true"
android:clickable="false"
android:indeterminate="true" />
</RelativeLayout>
</RelativeLayout>