我想在 LineGraph 上的接触点上敬酒。为此，我尝试使用 OnTouch() 内部方法，但它对我不起作用。我不知道如何开始，因为我是 achartengine 的新手。我试过这个..
public class DynamicGraphActivity extends Activity {
private static GraphicalView view;
private LineGraph line = new LineGraph();
private static Thread thread;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
thread = new Thread() {
public void run()
{
for (int i = 1; i < 31; i++)
{
Point p = MockData.getDataFromReceiver(i); // We got new data!
line.addNewPoints(p); // Add it to our graph
view.repaint();
}
}
};
thread.start();
}
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
displaycoordinates(event);
break;
case MotionEvent.ACTION_DOWN:
displaycoordinates(event);
break;
default:
break;
}
return true;
}
public void displaycoordinates(MotionEvent event) {
// TODO Auto-generated method stub
float x = event.getX();
float y = event.getY();
PointF point = new PointF(x,y);
NumberFormat nf = new DecimalFormat("#0.00");
//Double j = getXval(x);
String xval = nf.format(x);
// Double k = point.getYvalue(y);
String yval = nf.format(y);
Toast toast = Toast.makeText(getApplicationContext(), xval+"xval"+yval+" yval", 0);
toast.show();
}
@Override
protected void onStart() {
super.onStart();
view = line.getView(this);
setContentView(view);
}
}