Android 三轴绘制实时加速度曲线

public class GsensorActivity extends Activity implements SensorEventListener {

private static final String TAG = "GsensorActivity";
private SensorManager mSensorManager;
private Sensor mSensor;
private TextView textviewX;
private TextView textviewY;
private TextView textviewZ;
private TextView textviewF;

private float mX, mY, mZ;
private long lasttimestamp = 0;
Calendar mCalendar;
private GraphicalView chart;
/** 曲线数量 */
private static final int SERIES_NR = 1;
private TimeSeries series1;
private XYMultipleSeriesDataset dataset1;
private float addY = -1;
private long addX;
/** 时间数据 */
Date[] xcache = new Date[20];
/** 数据 */
float[] ycache = new float[20];

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gsensor);
textviewX = (TextView) findViewById(R.id.textView1);
textviewY = (TextView) findViewById(R.id.textView3);
textviewZ = (TextView) findViewById(R.id.textView4);
textviewF = (TextView) findViewById(R.id.textView2);

lasttimestamp = System.currentTimeMillis();

LinearLayout layout = (LinearLayout) findViewById(R.id.linearlayout);
// 生成图表
chart = ChartFactory.getTimeChartView(this, getDateDemoDataset(),
getDemoRenderer(), "hh:mm:ss");
layout.addView(chart, new LayoutParams(LayoutParams.WRAP_CONTENT, 380));

mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);// TYPE_GRAVITY
if (null == mSensorManager) {
Log.d(TAG, "deveice not support SensorManager");
}
// 参数三，检测的精准度
mSensorManager.registerListener(this, mSensor,
SensorManager.SENSOR_DELAY_NORMAL);// SENSOR_DELAY_GAME

}

private void updateChart(float a) {
// 设定长度为20
int length = series1.getItemCount();
if (length >= 20)
length = 20;
addY = a;
addX = new Date().getTime();

// 将前面的点放入缓存
for (int i = 0; i < length; i++) {
xcache[i] = new Date((long) series1.getX(i));
ycache[i] = (float) series1.getY(i);
}
series1.clear();
series1.add(new Date(addX), addY);
for (int k = 0; k < length; k++) {
series1.add(xcache[k], ycache[k]);
}
// 在数据集中添加新的点集
dataset1.removeSeries(series1);
dataset1.addSeries(series1);
// 曲线更新
chart.invalidate();
}

/**
* 设定如表样式
*
* @return
*/
private XYMultipleSeriesRenderer getDemoRenderer() {
XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
renderer.setChartTitle("实时曲线");// 标题
renderer.setChartTitleTextSize(20);
renderer.setXTitle("时间"); // x轴说明
renderer.setAxisTitleTextSize(16);
renderer.setAxesColor(Color.BLACK);
renderer.setLabelsTextSize(15); // 数轴刻度字体大小
renderer.setLabelsColor(Color.BLACK);
renderer.setLegendTextSize(15); // 曲线说明
renderer.setXLabelsColor(Color.BLACK);
renderer.setYLabelsColor(0, Color.BLACK);
renderer.setShowLegend(false);
renderer.setMargins(new int[] { 20, 30, 100, 0 });
XYSeriesRenderer r = new XYSeriesRenderer();
r.setColor(Color.BLUE);
r.setChartValuesTextSize(15);
r.setChartValuesSpacing(3);
r.setPointStyle(PointStyle.CIRCLE);
r.setFillBelowLine(true);
r.setFillBelowLineColor(Color.WHITE);
r.setFillPoints(true);
renderer.addSeriesRenderer(r);
renderer.setMarginsColor(Color.WHITE);
renderer.setPanEnabled(false, false);
renderer.setShowGrid(true);
renderer.setYAxisMax(50);
renderer.setYAxisMin(-30);
renderer.setInScroll(true); // 调整大小
return renderer;
}
/**
* 数据对象
*
* @return
*/
private XYMultipleSeriesDataset getDateDemoDataset() {
dataset1 = new XYMultipleSeriesDataset();
final int nr = 10;
long value = new Date().getTime();
Random r = new Random();
for (int i = 0; i < SERIES_NR; i++) {
series1 = new TimeSeries("Demo series " + (i + 1));
for (int k = 0; k < nr; k++) {
series1.add(new Date(value + k * 1000), 0);
}
dataset1.addSeries(series1);
}
Log.i(TAG, dataset1.toString());
return dataset1;
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor == null) {
return;
}

if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float x =  event.values[0];
float y =  event.values[1];
float z =  event.values[2];
mCalendar = Calendar.getInstance();
long stamp = mCalendar.getTimeInMillis();// 1393844912

textviewX.setText(String.valueOf(x));
textviewY.setText(String.valueOf(y));
textviewZ.setText(String.valueOf(z));

int second = mCalendar.get(Calendar.SECOND);// 53

float px = Math.abs(mX - x);
float py = Math.abs(mY - y);
float pz = Math.abs(mZ - z);
Log.d(TAG, "pX:" + px + "  pY:" + py + "  pZ:" + pz + "    stamp:"
+ stamp + "  second:" + second);
float maxvalue = getMaxValue(px, py, pz);
if (maxvalue > 2 && (stamp - lasttimestamp) > 200) {
lasttimestamp = stamp;

updateChart(x+y+z);

textviewF.setText("检测手机在移动..");
}

mX = x;
mY = y;
mZ = z;

}
}

/**
* 获取一个最大值
*
* @param px
* @param py
* @param pz
* @return
*/
public float getMaxValue(float px, float py, float pz) {
float max = 0;
if (px > py && px > pz) {
max = px;
} else if (py > px && py > pz) {
max = py;
} else if (pz > px && pz > py) {
max = pz;
}

return max;
}
}