Android 加速度

Activity程式碼如下： 

package com.example.acc;

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.util.Log;
import android.view.WindowManager;
import android.widget.TextView;

public class Acc extends Activity implements SensorEventListener {
    private TextView[] textViews = new TextView[3];
    private SensorManager manager;
    private Sensor sensor;
    private final float FILTERING_VALAUE = 0.1f;
    private float lowX, lowY, lowZ;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_acc);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        init();
    }

    private void init() {
        manager = (SensorManager) getSystemService(SENSOR_SERVICE);
        sensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        textViews[0] = (TextView) findViewById(R.id.textView1);
        textViews[1] = (TextView) findViewById(R.id.textView2);
        textViews[2] = (TextView) findViewById(R.id.textView3);
    }

    @Override
    protected void onPause() {
        manager.unregisterListener(this);
        super.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        manager.registerListener(this, sensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    public void onAccuracyChanged(Sensor arg0, int arg1) {

    }

    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            float x = event.values[manager.DATA_X];
            float y = event.values[manager.DATA_Y];
            float z = event.values[manager.DATA_Z];
            lowX = x * FILTERING_VALAUE + lowX * (1.0f - FILTERING_VALAUE);
            lowY = y * FILTERING_VALAUE + lowY * (1.0f - FILTERING_VALAUE);
            lowZ = z * FILTERING_VALAUE + lowZ * (1.0f - FILTERING_VALAUE);
            float highX = x - lowX;
            float highY = y - lowY;
            float highZ = z - lowZ;

            textViews[0].setText(String.valueOf(highX));
            textViews[1].setText(String.valueOf(highY));
            textViews[2].setText(String.valueOf(highZ));
            Log.i("X", "" + x);
            Log.i("Y", "" + y);
            Log.i("Z", "" + z);
        }
    }

}

Layout.xml如下： 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Large Text"
            android:textAppearance="?android:attr/textAppearanceLarge" />
    </LinearLayout>

</LinearLayout>

參考文章：
http://android.tgbus.com/Android/tutorial/201106/357188.shtml