Android的确定屏幕方向运行时 [英] Android determine screen orientation at runtime

问题描述

下面是一个伪code检测屏幕旋转活动，并决定保留或改变屏幕方向。

Here's a pseudo code to detect screen rotate event, and decide to retain or changes the screen orientation.

public boolean onOrientationChanges(orientation) {
  if(orientation == landscape)
    if(settings.get("lock_orientation"))
      return false;   // Retain portrait mode
    else
      return true; // change to landscape mode

  return true; 
}

我如何做类似的事情在Android的？

How do I make similar things in Android?

编辑： 实际上，我在寻找的答案在在哪里处理方向改变。我不想加入screenOrientation =肖像，以固定取向。

I'm actually looking answer on Where to handle orientation changes. I do not want to fix the orientation by adding screenOrientation="portrait".

我需要的东西，类似于onConfigurationChanges（），在那里我可以处理的方向，但我无需手动重绘的视图。

I need something, similar to onConfigurationChanges(), where I can handle the orientation, but do no need me to manually redraw the view.

推荐答案

您需要一个显示实例首先：

Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();

然后方向可以被称为是这样的：

Then orientation may be called like this:

int orientation = display.getOrientation();

检查取向的方式，并用它来更改方向

Check orientation as your way and use this to change orientation:

setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

我希望它能帮助。

I hope it helps.

更新

好吧，让我们说你的 oAllow VAR是布尔键，默认值为假。

Okay, let's say you've an oAllow var which is Boolean and default value is False.

public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
    int orientation = display.getOrientation(); 
    switch(orientation) {
        case Configuration.ORIENTATION_PORTRAIT:
            if(!oAllow) {
                    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }
            break;
        case Configuration.ORIENTATION_LANDSCAPE:
            if(!oAllow) {
                    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            }
            break;
    }
}

您可以添加更多的选择。

You can add more choices.

我没有尝试这个样，但至少告诉你如何解决一些线索。告诉我，如果你有任何错误。

I didn't try this sample, but at least tells you some clues about how to solve. Tell me if you got any error.

更新

getOrientation（）已去precated的在这里看到。相反，使用 getRotation（）。要检查设备是在横向模式下，你可以做这样的事情：

getOrientation() is already deprecated see here. Instead Use getRotation(). To check if the device is in landscape mode you can do something like this:

Display display = ((WindowManager) getSystemService(WINDOW_SERVICE))
        .getDefaultDisplay();

int orientation = display.getRotation();

if (orientation == Surface.ROTATION_90
        || orientation == Surface.ROTATION_270) {
    // TODO: add logic for landscape mode here            
}

这篇关于Android的确定屏幕方向运行时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！