java - 打开应用程序时如何删除黑屏

Question

我有一个闪屏，它只在应用程序重新启动时显示。如果用户点击后退按钮并再次启动应用程序，则不会显示启动画面。到这里为止一切都很好，如果不显示启动画面，打开应用程序时会有 1-2 秒的黑屏。这是我的 splashactivity java 文件；

public class SplashScreen extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
if(!prefs.getBoolean("first_time", false)) // if first time, show splash
{

    SharedPreferences.Editor editor = prefs.edit();
    editor.putBoolean("first_time", true);
    editor.commit();


    setContentView(R.layout.activity_splash);


    Thread t = new Thread() {
        public void run() {
            try {
                int time = 0;
                while (time < 4000) {
                    sleep(100);
                    time += 100;
                }
            }
            catch (InterruptedException e) {
                // do nothing
            }
            finally {

                Intent i = new Intent(SplashScreen.this, MainActivity.class);
                startActivity(i);
                finish();
            }
        }
    };
    t.start();
}
else // if not first time, dont show splash
{
    setContentView(R.layout.activity_splash);
    Intent i = new Intent(SplashScreen.this, MainActivity.class);
    startActivity(i);
    finish();
}

我该如何解决这个问题？

Answer 1

添加@Bryan 我向您推荐 cold start .例如我确实喜欢这个

在你的 Style.xml 中:

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

<style name="AppTheme.splashScreenLauncher">
    <item name="android:windowBackground">@drawable/splash_screen</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

</style>

splash_screen.xml:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:opacity="opaque">
    <!-- The background color, preferably the same as your normal theme -->
    <item android:drawable="@android:color/white"/>

    <item>
        <bitmap
            android:src="@drawable/SPLASHIMAGE"
            android:gravity="center"/>
    </item>
</layer-list>

在 list 中，您设置启动器 Activity 的地方:

android:theme="@style/AppTheme.splashScreenLauncher"> 

在您的启动器 Activity 中:

setTheme(R.style.AppTheme); // IMPORTANT BEFORE super.onCreate
super.onCreate(savedInstanceState);