10

我正在尝试从我的 android 手机上的传感器获取倾斜角、滚动角，但到目前为止没有成功，

当我单击应该给我 3 个角度的按钮时，我得到“结果：0.0 -0.0 -0.0” 

package com.example;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Button;
import android.view.View;


public class MyActivity extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final float[] mValuesMagnet      = new float[3];
        final float[] mValuesAccel       = new float[3];
        final float[] mValuesOrientation = new float[3];
        final float[] mRotationMatrix    = new float[9];

        final Button btn_valider = (Button) findViewById(R.id.btn1);
        final TextView txt1 = (TextView) findViewById(R.id.textView1);
        final SensorEventListener mEventListener = new SensorEventListener() {
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
            }

            public void onSensorChanged(SensorEvent event) {
                // Handle the events for which we registered
                switch (event.sensor.getType()) {
                    case Sensor.TYPE_ACCELEROMETER:
                        System.arraycopy(event.values, 0, mValuesAccel, 0, 3);
                        break;

                    case Sensor.TYPE_MAGNETIC_FIELD:
                        System.arraycopy(event.values, 0, mValuesMagnet, 0, 3);
                        break;
                }
            };
        };
        btn_valider.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view)
            {
                SensorManager.getRotationMatrix(mRotationMatrix, null, mValuesAccel, mValuesMagnet);
                SensorManager.getOrientation(mRotationMatrix, mValuesOrientation);
                final CharSequence test;
                test = "results: " + mValuesOrientation[0] +" "+mValuesOrientation[1]+ " "+ mValuesOrientation[2];
                txt1.setText(test);
            }
        });

    }
}
4

1 回答 1

18

您几乎可以使用代码 Mike，但要使事件侦听器能够检索任何传感器的数据，必须使用以下方法向 SensorManager 类注册所需的事件侦听器和传感器：

SensorManager _sensorManager;

_sensorManager.registerListener(mEventListener, _sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
                SensorManager.SENSOR_DELAY_NORMAL);

下面是您的代码，适用于显示我认为您希望看到的数据。

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Button;
import android.view.View;


public class StackOverflowTestingGroundActivity extends Activity
{   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        

        SensorManager sensorManager = (SensorManager) this.getSystemService(SENSOR_SERVICE);        

        final float[] mValuesMagnet      = new float[3];
        final float[] mValuesAccel       = new float[3];
        final float[] mValuesOrientation = new float[3];
        final float[] mRotationMatrix    = new float[9];

        final Button btn_valider = (Button) findViewById(R.id.btn1);
        final TextView txt1 = (TextView) findViewById(R.id.textView1);
        final SensorEventListener mEventListener = new SensorEventListener() {
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
            }

            public void onSensorChanged(SensorEvent event) {
                // Handle the events for which we registered
                switch (event.sensor.getType()) {
                    case Sensor.TYPE_ACCELEROMETER:
                        System.arraycopy(event.values, 0, mValuesAccel, 0, 3);
                        break;

                    case Sensor.TYPE_MAGNETIC_FIELD:
                        System.arraycopy(event.values, 0, mValuesMagnet, 0, 3);
                        break;
                }
            };
        };

        // You have set the event lisetner up, now just need to register this with the
        // sensor manager along with the sensor wanted.
        setListners(sensorManager, mEventListener);

        btn_valider.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view)
            {
                SensorManager.getRotationMatrix(mRotationMatrix, null, mValuesAccel, mValuesMagnet);
                SensorManager.getOrientation(mRotationMatrix, mValuesOrientation);
                final CharSequence test;
                test = "results: " + mValuesOrientation[0] +" "+mValuesOrientation[1]+ " "+ mValuesOrientation[2];
                txt1.setText(test);
            }
        });

    }

    // Register the event listener and sensor type.
    public void setListners(SensorManager sensorManager, SensorEventListener mEventListener)
    {
        sensorManager.registerListener(mEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
                SensorManager.SENSOR_DELAY_NORMAL);
        sensorManager.registerListener(mEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), 
                SensorManager.SENSOR_DELAY_NORMAL);
    }
}
于 2012-01-13T12:16:12.300 回答