如何设置共享的首选项以在首次启动时显示自定义动画

Question

我是android编程的初学者。我不清楚共享偏好的概念。我需要在应用程序的第一次启动时设置一个特定的动画（来自片段活动的片段），并为应用程序的连续启动设置另一个动画（最小化）。那么，我如何利用共同的偏好来做到这一点呢？

Answer 1

public class MyActivity extends FragmentActivity {
    SharedPreferences prefs = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Perhaps set content view here
        prefs = getSharedPreferences("key", MODE_PRIVATE);
    }
    @Override
    protected void onResume() {
        super.onResume();
        if (prefs.getBoolean("firstrun", true)) {
            prefs.edit().putBoolean("firstrun", false).commit();
            // here comes your animation for first start
        }
        // here comes your animation for other starts
    }
}

Answer 2

在developer.android.com 上查看此文档

看看这些链接：

http://examples.javacodegeeks.com/android/core/content/android-sharedpreferences-example/

http://www.vogella.com/articles/AndroidFileBasedPersistence/article.html

http://rajeshvijayakumar.blogspot.in/2013/03/shared-preferences-example-in-android.html

http://androiddeveloperspot.blogspot.in/2013/01/sharedpreference-in-android.html

http://alchemiaandroid.altervista.org/sharedPreferencesTutorial.html

http://www.androidhive.info/2012/08/android-session-management-using-shared-preferences/

http://www.edumobile.org/android/android-development/shared-preferences-example-in-android-programming/

http://viralpatel.net/blogs/android-preferences-activity-example/

Answer 3

对于动画，请使用此

overridePendingTransition(R.anim.no_anim, R.anim.slide_to_top);

要创建动画，请在"res"中创建"anim"文件夹，并像下面的一样创建slideleft.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="200"
        android:fromXDelta="0%"
        android:toXDelta="-100%" />
    <alpha
        android:duration="200"
        android:fromAlpha="1"
        android:toAlpha="0" />
</set>