Activity Notes

最新推荐文章于 2024-06-25 10:30:00 发布

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最新推荐文章于 2024-06-25 10:30:00 发布

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分类专栏： Android入门笔记文章标签： android activity

本文链接：https://blog.youkuaiyun.com/sam_linux/article/details/14648861

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本文探讨了Android应用中因未正确声明MAIN行动或LAUNCHER类别导致应用图标不显示的问题，并提供了代码示例来解决该问题。此外，还介绍了如何通过onSaveInstanceState和onRestoreInstanceState方法保存和恢复游戏状态。

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If either the MAIN action or LAUNCHER category are not declared for one of your activities, then your app icon will not appear in the Home screen's list of apps.

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// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    // For the main activity, make sure the app icon in the action bar
    // does not behave as a button
    ActionBar actionBar = getActionBar();
    actionBar.setHomeButtonEnabled(false);
}

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@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    // Save the user's current game state
    savedInstanceState.putInt(STATE_SCORE, mCurrentScore);
    savedInstanceState.putInt(STATE_LEVEL, mCurrentLevel);
    
    // Always call the superclass so it can save the view hierarchy state
    super.onSaveInstanceState(savedInstanceState);
}

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public void onRestoreInstanceState(Bundle savedInstanceState) {
    // Always call the superclass so it can restore the view hierarchy
    super.onRestoreInstanceState(savedInstanceState);
   
    // Restore state members from saved instance
    mCurrentScore = savedInstanceState.getInt(STATE_SCORE);
    mCurrentLevel = savedInstanceState.getInt(STATE_LEVEL);
}