Android Dev Notes - 3 - 添加加速度传感器

如何添加Senor

1. 获取系统提供的Sensor服务，一般放在onCreate()函数中

sm = (SensorManager)getSystemService(SENSOR_SERVICE);

2.为Sensor添加监听器，一般放在onCreate()函数中

localSensorListener = new LocalSensorListener();

3. 注册sensor，一般放在oonResume()函数中

sm.registerListener(localSensorListener,
                SensorManager.SENSOR_ACCELEROMETER,
                SensorManager.SENSOR_DELAY_NORMAL);

4.用完注销sensor，一般放在onPause()函数中

sm.unregisterListener(localSensorListener);

5.实现sensor的主体，override函数onSensorChanged()和onAccuracyChanged()

 

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为了理解Sensor的数值，贴上一段IBM Developer上关于Sensor的实例程序，以后有修改也可以及时补充

package lily.test; import android.app.Activity; import android.hardware.SensorListener; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.widget.TextView; public class AndroidTest extends Activity implements SensorListener { /** Called when the activity is first created. */ final String tag = "IBMEyes"; SensorManager sm = null; TextView xViewA = null; TextView yViewA = null; TextView zViewA = null; TextView xViewO = null; TextView yViewO = null; TextView zViewO = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); sm = (SensorManager) getSystemService(SENSOR_SERVICE); xViewA = (TextView) findViewById(R.id.xbox); yViewA = (TextView) findViewById(R.id.ybox); zViewA = (TextView) findViewById(R.id.zbox); xViewO = (TextView) findViewById(R.id.xboxo); yViewO = (TextView) findViewById(R.id.yboxo); zViewO = (TextView) findViewById(R.id.zboxo); } @Override public void onAccuracyChanged(int sensor, int accuracy) { Log.d(tag,"onAccuracyChanged: " + sensor + ", accuracy: " + accuracy); } @Override public void onSensorChanged(int sensor, float[] values) { synchronized (this) { Log.d(tag, "onSensorChanged: " + sensor + ", x: " + values[0] + ", y: " + values[1] + ", z: " + values[2]); if (sensor == SensorManager.SENSOR_ORIENTATION) { xViewO.setText("Orientation X: " + values[0]); yViewO.setText("Orientation Y: " + values[1]); zViewO.setText("Orientation Z: " + values[2]); } if (sensor == SensorManager.SENSOR_ACCELEROMETER) { xViewA.setText("Accel X: " + values[0]); yViewA.setText("Accel Y: " + values[1]); zViewA.setText("Accel Z: " + values[2]); } } } @Override protected void onResume() { super.onResume(); // register this class as a listener for the orientation and accelerometer sensors sm.registerListener(this, SensorManager.SENSOR_ORIENTATION |SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onStop() { sm.unregisterListener(this); super.onStop(); } }

 

 

 

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贴上一段自己写的游戏Demo的程序

 

public class IceBall extends Activity { /** Called when the activity is first created. */ private IceBallView mIceBallView; private SensorManager sm; private LocalSensorListener localSensorListener; boolean isEnd; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); mIceBallView = (IceBallView)findViewById(R.id.iceBall); sm = (SensorManager)getSystemService(SENSOR_SERVICE); localSensorListener = new LocalSensorListener(); isEnd = false; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { mIceBallView.onKeyMsg(keyCode, event); if(isEnd == false && mIceBallView.isEnd() == true) { isEnd = true; Intent intent = new Intent(IceBall.this, PassDialog.class); startActivity(intent); } return super.onKeyDown(keyCode, event); } @Override public boolean onTouchEvent(MotionEvent event) { return super.onTouchEvent(event); } @Override protected void onPause() { sm.unregisterListener(localSensorListener); super.onPause(); } @Override protected void onResume() { sm.registerListener(localSensorListener, SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_NORMAL); super.onResume(); } class LocalSensorListener implements SensorListener{ @Override public void onAccuracyChanged(int sensor, int accuracy) { } @Override public void onSensorChanged(int sensor, float[] values) { float x = values[0]; float y = values[1]; if(x > 1){ onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null); return; } if(x<-1){ onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null); return; } if(y>1){ onKeyDown(KeyEvent.KEYCODE_DPAD_UP, null); return; } if(y<-1){ onKeyDown(KeyEvent.KEYCODE_DPAD_DOWN, null); return; } } } }

 

onSensorChanged()中取得参照手机坐标系的加速度值float[] values中取得x,y,z三个方向的加速度值，

设备的坐标系如图所示（注：此图来自于Android sdk doc）

x > 0 表示手机向右转， x<0 表示手机向左转

y > 0 表示手机向上转， y<0 表示手机向下转

 

并且sensor可以根据需要改变其灵敏度

SENSOR_DELAY_FASTEST         最灵敏
SENSOR_DELAY_GAME            游戏的时候用这个
SENSOR_DELAY_NORMAL        比较慢。
SENSOR_DELAY_UI                 最慢的，几乎就是横和纵的区别