23

您好，我想使用该类型type_orientation，但不推荐使用 android 4.0.3 。我将它用于增强现实。我试图在网上找到但没有成功。我的应用程序有效，但我里面的文字留在同一个地方！这是我的代码：

 @Override
    protected void onStart() {      
        super.onStart();
        sensorMngr = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        sensorLstr = createListener();
        sensorMngr.registerListener(sensorLstr, sensorMngr.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_UI);
    }

    @Override
    protected void onStop() {       
        super.onStop();
        sensorMngr = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        sensorMngr.unregisterListener(sensorLstr, sensorMngr.getDefaultSensor(Sensor.TYPE_ORIENTATION));        
    }

一切都很好，我已经在http://developer.android.com/reference/android/hardware/Sensor.html上看过，但我听不懂（我是法国人，我的英语不是很完美...... ） 非常感谢您的帮助！！！

4

1 回答 1

18

这是一个包含解决方案的博客的链接。从本质上讲，您停止使用方向传感器并同时使用磁场传感器和加速度传感器来获得等效的功能。这是更多的工作，但它确实允许您继续使用回调来处理方向更改。

编辑：由于原始站点不再可用，因此这里是以前托管在那里的代码示例：

package com.samplecompass;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;

public class CompassActivity extends Activity implements SensorEventListener {

  Float azimut;  // View to draw a compass

  public class CustomDrawableView extends View {
    Paint paint = new Paint();
    public CustomDrawableView(Context context) {
      super(context);
      paint.setColor(0xff00ff00);
      paint.setStyle(Style.STROKE);
      paint.setStrokeWidth(2);
      paint.setAntiAlias(true);
    };

    protected void onDraw(Canvas canvas) {
      int width = getWidth();
      int height = getHeight();
      int centerx = width/2;
      int centery = height/2;
      canvas.drawLine(centerx, 0, centerx, height, paint);
      canvas.drawLine(0, centery, width, centery, paint);
      // Rotate the canvas with the azimut      
      if (azimut != null)
        canvas.rotate(-azimut*360/(2*3.14159f), centerx, centery);
      paint.setColor(0xff0000ff);
      canvas.drawLine(centerx, -1000, centerx, +1000, paint);
      canvas.drawLine(-1000, centery, 1000, centery, paint);
      canvas.drawText("N", centerx+5, centery-10, paint);
      canvas.drawText("S", centerx-10, centery+15, paint);
      paint.setColor(0xff00ff00);
    }
  }

  CustomDrawableView mCustomDrawableView;
  private SensorManager mSensorManager;
  Sensor accelerometer;
  Sensor magnetometer;

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mCustomDrawableView = new CustomDrawableView(this);
    setContentView(mCustomDrawableView);    // Register the sensor listeners
    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
      accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
  }

  protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_UI);
    mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_UI);
  }

  protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
  }

  public void onAccuracyChanged(Sensor sensor, int accuracy) {  }

  float[] mGravity;
  float[] mGeomagnetic;
  public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
      mGravity = event.values;
    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
      mGeomagnetic = event.values;
    if (mGravity != null && mGeomagnetic != null) {
      float R[] = new float[9];
      float I[] = new float[9];
      boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic);
      if (success) {
        float orientation[] = new float[3];
        SensorManager.getOrientation(R, orientation);
        azimut = orientation[0]; // orientation contains: azimut, pitch and roll
      }
    }
    mCustomDrawableView.invalidate();
  }
}
于 2013-07-04T20:53:11.240 回答