나는 자동차가 움직이거나 주차 할 때를 감지하여 속도를 감지하는 앱을 개발 중입니다. 현재 속도를 감지하는 코드가 있지만 속도를 20km/h 이상으로 돌리면 아무 것도하지 않고 속도가 0km/h이면 아무 것도하지 않도록 해당 코드를 쓰는 방법을 모르겠습니다. 당신의 방법 onGPSUpdate()
에서자동차가 움직이거나 멈 추면 안드로이드가 감지합니다.
public class DeviceSpeedDemoActivity extends Activity implements GPSCallback{
private GPSManager gpsManager = null;
private double speed = 0.0;
private int measurement_index = Constants.INDEX_KM;
private AbsoluteSizeSpan sizeSpanLarge = null;
private AbsoluteSizeSpan sizeSpanSmall = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gpsManager = new GPSManager();
gpsManager.startListening(getApplicationContext());
gpsManager.setGPSCallback(this);
((TextView)findViewById(R.id.info_message)).setText(getString(R.string.info));
measurement_index = AppSettings.getMeasureUnit(this);
}
@Override
public void onGPSUpdate(Location location)
{
location.getLatitude();
location.getLongitude();
speed = location.getSpeed();
String speedString = "" + roundDecimal(convertSpeed(speed),2);
String unitString = measurementUnitString(measurement_index);
setSpeedText(R.id.info_message,speedString + " " + unitString);
}
@Override
protected void onDestroy() {
gpsManager.stopListening();
gpsManager.setGPSCallback(null);
gpsManager = null;
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
boolean result = true;
switch(item.getItemId())
{
case R.id.menu_about:
{
displayAboutDialog();
break;
}
case R.id.unit_km:
{
measurement_index = 0;
AppSettings.setMeasureUnit(this, 0);
break;
}
case R.id.unit_miles:
{
measurement_index = 1;
AppSettings.setMeasureUnit(this, 1);
break;
}
default:
{
result = super.onOptionsItemSelected(item);
break;
}
}
return result;
}
private double convertSpeed(double speed){
return ((speed * Constants.HOUR_MULTIPLIER) * Constants.UNIT_MULTIPLIERS[measurement_index]);
}
private String measurementUnitString(int unitIndex){
String string = "";
switch(unitIndex)
{
case Constants.INDEX_KM: string = "km/h"; break;
case Constants.INDEX_MILES: string = "mi/h"; break;
}
return string;
}
private double roundDecimal(double value, final int decimalPlace)
{
BigDecimal bd = new BigDecimal(value);
bd = bd.setScale(decimalPlace, RoundingMode.HALF_UP);
value = bd.doubleValue();
return value;
}
private void setSpeedText(int textid,String text)
{
Spannable span = new SpannableString(text);
int firstPos = text.indexOf(32);
span.setSpan(sizeSpanLarge, 0, firstPos,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
span.setSpan(sizeSpanSmall, firstPos + 1, text.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
TextView tv = ((TextView)findViewById(textid));
tv.setText(span);
}
private void displayAboutDialog()
{
final LayoutInflater inflator = LayoutInflater.from(this);
final View settingsview = inflator.inflate(R.layout.about, null);
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(getString(R.string.app_name));
builder.setView(settingsview);
builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.create().show();
}
}
if-then-else가 적합하지 않은 이유는 무엇입니까? –
if-else와 같은 조건을 지정하십시오. –
새로운 위치 인식을 조사해야합니다. 그것은 기본적으로 당신을 위해이 모든 힘든 일을합니다. http://developer.android.com/training/location/activity-recognition.html – roostertech