我使用AChartEngine Api创建了动态折线图,显示了G-Force值的变化.一切正常,但当图形在X轴向前移动时,我必须在X轴上手动滚动才能进一步查看,如果您没有正确使用我,请查看下面的图像.

如何让它在x轴上自动滚动以避免手动滚动？

以下是我的代码

public class GraphActivity extends Activity implements SensorEventListener{

private LinearLayout lyGforce;

//=== G-force =======

private SensorManager mSensorManager;

private Sensor mAccelerometer;

private float gOffset;

private boolean calibrate;

private static TimeSeries timeSeriesGforce;

private static XYMultipleSeriesDataset datasetGforce;

private static XYMultipleSeriesRenderer rendererGforce;

private static XYSeriesRenderer rendererSeriesGforce;

private static GraphicalView viewGforce;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.mainactivity);

lyGforce = (LinearLayout) findViewById(R.id.lygforce);

//=========== G-force =======

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

datasetGforce = new XYMultipleSeriesDataset();

rendererGforce = new XYMultipleSeriesRenderer();

rendererGforce.setApplyBackgroundColor(true);

rendererGforce.setBackgroundColor(Color.argb(100, 50, 50, 50));

rendererGforce.setAxisTitleTextSize(16);

rendererGforce.setChartTitleTextSize(20);

rendererGforce.setLabelsTextSize(15);

rendererGforce.setLegendTextSize(15);

rendererGforce.setMargins(new int[] { 20, 30, 15, 0 });

rendererGforce.setZoomButtonsVisible(true);

rendererGforce.setPointSize(10);

rendererGforce.setShowGrid(true);

rendererGforce.setGridColor(Color.WHITE);

rendererSeriesGforce = new XYSeriesRenderer();

rendererSeriesGforce.setColor(Color.GREEN);

rendererSeriesGforce.setLineWidth(2);

rendererGforce.addSeriesRenderer(rendererSeriesGforce);

timeSeriesGforce = new TimeSeries("G-Force");

datasetGforce.addSeries(timeSeriesGforce);

viewGforce = ChartFactory.getTimeChartView(this, datasetGforce, rendererGforce, "");

viewGforce.refreshDrawableState();

viewGforce.repaint();

lyGforce.addView(viewGforce);

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

// ============= G-force ==================//

calibrate = true;

mSensorManager.registerListener(this, mAccelerometer,

SensorManager.SENSOR_DELAY_UI);

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

//========== G-force=============//

mSensorManager.unregisterListener(this);

}

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy) {

// TODO Auto-generated method stub

}

//========== G-force=============//

@Override

public void onSensorChanged(SensorEvent event) {

// TODO Auto-generated method stub

switch (event.sensor.getType()) {

case Sensor.TYPE_ACCELEROMETER:

float x = event.values[0];

float y = event.values[1]; // Use to calculate G-Force value

float z = event.values[2];

if(calibrate)

gOffset = y - SensorManager.GRAVITY_EARTH;

double gForce = ((y - gOffset) / SensorManager.GRAVITY_EARTH);

timeSeriesGforce.add(new Date(), gForce);

rendererGforce.setXAxisMax(rendererGforce.getXAxisMax() + 30);

rendererGforce.setXAxisMin(rendererGforce.getXAxisMin() + 30);

viewGforce.repaint();

Log.e("NIRAV","G-Force: "+String.valueOf(gForce));

calibrate = false;

break;

default:

break;

}

}

}