使用不同的主题取决于如果设备是Android平板电脑或手机 [英] Use different theme depending on if device is android tablet or phone

问题描述

我想知道我可以改变这取决于活动的主题，如果该设备是平板电脑或手机。我有一个设置的活动，有一个 @android：款式/ Theme.Black.NoTitleBar 主题吧。在数位板上我喜欢这个活动的主题是这样的 @android：款式/ Theme.Dialog

I was wondering how I can change the theme of an activity depending on if the device is a tablet or a phone. I have a settings activity that has a @android:style/Theme.Black.NoTitleBar theme to it. On the tablet I'd love the theme of this activity to be something like @android:style/Theme.Dialog

我选择在Manifest.xml文件活动的主题，但我可以看到有这个清单文件中没有平板电脑的版本？

I chose the theme of the activity in the Manifest.xml file, but as I can see there is no tablet version of this manifest file?

我如何更改主题这个活动？我也可以更改主题为其他一些活动，以及隐藏操作栏。

How can I change the theme for this activity? I might also change the theme for some other activities as well to hide the action bar.

推荐答案

您可以动态每项活动像这里面的设置

You can set it dynamically inside each activity like this:

 protected void onCreate(Bundle icicle) {

    super.onCreate(icicle);

    // ...

    // Call setTheme before creation of any(!) View.

    if(isTablet()) {
        setTheme(android.R.style.Black);
    }
    else {
        setTheme(android.R.style.Theme_Dark);
    }     
    // ...

    setContentView(R.layout.main);
}

现在你需要 isTablet 方法，但它是一个有点难以察觉的设备类型。这里有一个方法，我在网上找到，它会检查屏幕尺寸，如果屏幕大它假定当前设备是平板电脑：

Now you need isTablet method but it is a bit difficult to detect device type. Here is a method I found online, it checks the screen size and if the screen is big it assumes current device is a tablet.:

public boolean isTablet() {
    try {
        // Compute screen size
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        float screenWidth  = dm.widthPixels / dm.xdpi;
        float screenHeight = dm.heightPixels / dm.ydpi;
        double size = Math.sqrt(Math.pow(screenWidth, 2) +
                                Math.pow(screenHeight, 2));
        // Tablet devices should have a screen size greater than 6 inches
        return size >= 6;
    } catch(Throwable t) {
        Log.error(TAG_LOG, "Failed to compute screen size", t);
        return false;
    }

} 

这篇关于使用不同的主题取决于如果设备是Android平板电脑或手机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！