Android设备的定位

Question

你会认为会有一个直接的解决方案。Android文档声明：

定位传感器在Android2.2 (API级别8)中被废弃。我们建议您使用getRotationMatrix()方法和getOrientation()方法来计算方位值，而不是使用来自定位传感器的原始数据。

然而，它们并没有提供如何实现getOrientation()和getRotationMatrix()的解决方案。我花了几个小时阅读关于使用这些方法的开发人员的文章，但是他们都有部分粘贴的代码或一些奇怪的实现。谷歌还没有提供任何教程。有人能用这两种方法粘贴一个简单的解决方案来生成方向吗？？

Answer 1

下面是getOrientation()的实现：

public int getscrOrientation()
    {
        Display getOrient = getWindowManager().getDefaultDisplay();

        int orientation = getOrient.getOrientation();

        // Sometimes you may get undefined orientation Value is 0
        // simple logic solves the problem compare the screen
        // X,Y Co-ordinates and determine the Orientation in such cases
        if(orientation==Configuration.ORIENTATION_UNDEFINED){

            Configuration config = getResources().getConfiguration();
            orientation = config.orientation;

            if(orientation==Configuration.ORIENTATION_UNDEFINED){
                //if height and widht of screen are equal then
                // it is square orientation
                if(getOrient.getWidth()==getOrient.getHeight()){
                    orientation = Configuration.ORIENTATION_SQUARE;
                }else{ //if widht is less than height than it is portrait
                    if(getOrient.getWidth() < getOrient.getHeight()){
                        orientation = Configuration.ORIENTATION_PORTRAIT;
                    }else{ // if it is not any of the above it will definitely be landscape
                        orientation = Configuration.ORIENTATION_LANDSCAPE;
                    }
                }
            }
        }
        return orientation; // return value 1 is portrait and 2 is Landscape Mode
    }

您还可以参考这个示例，它表示这两种方法的使用：

     getOrientation and getRotationMatrix

http://www.codingforandroid.com/2011/01/using-orientation-sensors-simple.html

Answer 2

 public int getScreenOrientation() {


// Query what the orientation currently really is.
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)                {
    return 1; // Portrait Mode

}else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
    return 2;   // Landscape mode
}
return 0;
}

Answer 3

protected void onResume() {
    // change the screen orientation
    if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
        setContentView(R.layout.portrait);
    } else if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
        setContentView(R.layout.landscape);
    } else {
        setContentView(R.layout.oops);
    }
}