android 方向传感器的使用

最新推荐文章于 2021-05-25 17:36:11 发布

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本文介绍了一个简单的Android应用示例，该应用使用OrientationEventListener来监听设备的方向变化，并在界面上显示相应的方向状态。当设备方向发生变化时，应用会更新UI以显示当前的方向角度，并给出具体的描述，如手机顶部向上等。

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public class SimpleOrientationActivity extends Activity {

private static final String DEBUG_TAG = "SimpleOrientationActivity";

OrientationEventListener mOrientationListener;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mOrientationListener = new OrientationEventListener(this,
SensorManager.SENSOR_DELAY_NORMAL) {

@Override
public void onOrientationChanged(int orientation) {
Log.v(DEBUG_TAG, "Orientation changed");
TextView orientationStatus = (TextView) findViewById(R.id.oStatus);
String resultOrientation = String.format(getResources()
.getString(R.string.orientation_status), orientation);
orientationStatus.setText(resultOrientation);

TextView orientationCommentary = (TextView) findViewById(R.id.oCommentary);
if (orientation == -1) {
orientationCommentary.setText("手机平放");
} else if (orientation < 10 || orientation > 350) {
orientationCommentary.setText("手机顶部向上");
} else if (orientation < 100 && orientation > 80) {
orientationCommentary.setText("手机右边向上");
} else if (orientation < 190 && orientation > 170) {
orientationCommentary.setText("手机边边向上");
} else if (orientation < 280 && orientation > 260) {
orientationCommentary.setText("手机左边向上");
} else
{
orientationCommentary.setText("");
}
}
};

if (mOrientationListener.canDetectOrientation() == true) {
Log.v(DEBUG_TAG, "Can detect orientation");
mOrientationListener.enable();
} else {
Log.v(DEBUG_TAG, "Cannot detect orientation");
mOrientationListener.disable();
}
}

@Override
protected void onDestroy() {
super.onDestroy();
mOrientationListener.disable();
}

}