Android 自然传感器方向帮助 [英] Android natural sensor orientation help

问题描述

我正在尝试实现 Reto Meier 推荐的保持屏幕方向不变的方法.他在 Google IO 期间演讲的幻灯片(参见 #23)可以在 Android 提示:在哪里下载幻灯片和代码片段.

I am trying to accomplish Reto Meier's recommended way for keeping the screen orientation from changing. The slides from his talk during Google IO (see #23) can be found in Android Protips: Where to Download the Slides and Code Snippets.

我已逐步完成代码并设置了值，但屏幕方向仍会发生变化.仅供参考，我在应用程序中注册了这个监听器.

I have stepped through the code and it setting the values, but the screen orientation still changes. FYI, I register this listener in the Application.

这是我的代码:

final SensorManager sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    sm.registerListener(
        new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent sensorEvent) {
                if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) {
                    final WindowManager wm = (WindowManager) getApplicationContext()
                            .getSystemService(Context.WINDOW_SERVICE);
                    final Display display = wm.getDefaultDisplay();

                    int x = SensorManager.AXIS_X;
                    int y = SensorManager.AXIS_Y;

                    switch (display.getRotation()) {
                    case Surface.ROTATION_90:
                        x = SensorManager.AXIS_Y;
                        y = SensorManager.AXIS_MINUS_X;

                        break;
                    case Surface.ROTATION_180:
                        y = SensorManager.AXIS_MINUS_Y;

                        break;
                    case Surface.ROTATION_270:
                        x = SensorManager.AXIS_MINUS_Y;
                        y = SensorManager.AXIS_MINUS_X;

                        break;
                    case Surface.ROTATION_0:
                    default:
                        break;
                    }

                    SensorManager.remapCoordinateSystem(sensorEvent.values, x, y, new float[] {});
                }
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {

            }
        }, sm.getDefaultSensor(Sensor.TYPE_ORIENTATION),
        SensorManager.SENSOR_DELAY_NORMAL);

推荐答案

所有 30 多行当前不起作用的代码都可以替换为 AndroidManifest.xml 文件中的一些 XML 值.

All 30+ lines of code that currently are not working can be replaced with some XML values in your AndroidManifest.xml file.

我们都见过

<activity android:name=".YourActivity" android:screenOrientation="portrait" ></activity>

而且我们都知道这不适用于具有默认横向方向的平板电脑.但是你们有多少人看过这个?

and we all know that doesn't work well with tablets that have a default orientation of landscape. But how many of you have seen this?

<activity android:name=".YourActivity" android:screenOrientation="nosensor" ></activity>

基本上它使设备的方向不会响应传感器.因此，如果您的默认设置是横向或纵向，则它不会改变.我已经在我的 Droid X 和 Xoom 并且它的工作原理与我预期的一样.

Basically it makes it so that the device's orientation doesn't respond to the sensor. So if your default is landscape or portrait it won't change. I have tested it on my Droid X and on a Xoom and it works like I would have expected it to.

我希望这能帮助其他人.

I hope this helps others.

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