包含finish()和back按钮的启动屏幕
包含finish()和back按钮的启动屏幕
提问于 2013-01-15 09:33:51
好了，我的应用程序上有一个闪屏。
我可以让用户只需输入finish()就不能返回到初始屏幕，虽然我现在记不住了，但我可以让它只加载一次。一旦我调用finish()，在重新进入应用程序时，启动画面将再次出现。有没有办法解决这个问题？
Stack Overflow用户
发布于 2014-09-02 23:13:41
对于SplashScreenActivity，你是在浪费时间，因为它们在继续之前会暂停初始化2-3秒。
我更喜欢在我的main_activity.xml上添加一个Splash Screen Layout。我通过扩展Application来检测应用程序的第一个启动。如果是第一次启动，当UI在后台构建时，我会显示闪屏。(如果ProgressBar延迟，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();
...
}检查您在MainActivity中的第一次启动
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();
}在main.xml中的顶部插入SplashScreen。在这方面，我更喜欢RelativeLayout。在这个例子中，SplashScreen被放在了一个带有Navitgation Drawer的布局上，我们真的很喜欢它，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> 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14329822
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