操作方向转变Android [英] Handling orientation changes android

问题描述

我具有包含数每行的图像的表。每行图像的数量决定基于所述图像的宽度和屏幕宽度的飞行。当我用手机正常，图像间隔在手机屏幕上。当手机取向改变，所有的图像显示在同一行上。我应该明确地处理方向改变这种情况？

  //获取每列图像为基础的屏幕上的数字
// 解析度
显示显示= getWindowManager（）getDefaultDisplay（）。
INT屏幕宽度= display.getWidth（）;资源解析度= getResources（）;
可绘制可绘制= res.getDrawable（R.drawable.emo_im_happy）;numberOfImagesPerRow =屏幕宽度/（drawable.getIntrinsicWidth（）+ 10）;INT numberOfRows =（int）的Math.ceil（numberOfEmotions
                    / numberOfImagesPerRow）;
 

解决方案

在运行code时，这取决于，但通常不需要做什么特别的。

当Android的检测改变方向时，系统会重新创建活动，它会得到一个机会去通过的onCreate和重新布局，并根据新的配置重新渲染一切。

采用Android 的android：configChanges 应小心使用，而不是被你想到的第一个选项，因为系统将在为你选择合适的资源做得更好配置更改后（并且你必须处理其他形式的配置更改反正那code路径）。

请参阅：
http://developer.android.com/guide/topics/resources/runtime -changes.html

I have a Table containing a number of images per row. The number of images per row is decided on the fly based on the image width and screen width. When I use the phone normally, images are spaced on the phone screen. When the phone orientation changes, all the images appear on the same row. Should I explicitly handle the orientation changes for this case?

// get the number of images per column based on the screen
// resolution
Display display = getWindowManager().getDefaultDisplay();
int screenWidth = display.getWidth();

Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.emo_im_happy);

numberOfImagesPerRow = screenWidth / (drawable.getIntrinsicWidth() + 10);

int numberOfRows = (int) Math.ceil(numberOfEmotions
                    / numberOfImagesPerRow);

解决方案

It depends when that code is run, but you generally don't need to do anything special.

When Android detects an orientation change, the system will re-create your Activity and it will get a chance to go through onCreate and re-layout and re-render everything according to the new configuration.

Using android android:configChanges should be used with care and not be the first option you think of, since the system will do a better job at selecting appropriate resources for you after a configuration change (and you'll have to handle that code path for other forms of configuration change anyways).

See: http://developer.android.com/guide/topics/resources/runtime-changes.html

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