如何获取用户的 GPS 位置并在每次位置发生变化时实现文本视图?
我正在尝试做一个简单的活动,读取用户的 GPS 位置,并在每次用户位置发生变化时实现一个简单的文本视图。
我在谷歌上找到了一些例子,但它们都不是很好的例子,因为只捕获用户一次的位置,并且我需要每次位置随着用户的新纬度和经度发生变化时,文本视图都会被实际化。
我尝试做一个线程,但它失败了,我认为没有必要做一个线程,我的方式是错误的。
欢迎代码示例
编辑:我正在添加用户 NickT 提出的解决方案。 这个解决方案失败了。我不知道为什么,但只实现了文本视图的两倍,其中前两个 GPS 值是我用 DDMS 传递给模拟器的......在此之后,thextview 没有被实现更多次...为什么?我在 onLocationChanged 中设置了一个断点,并且只有在我发送 GPS 位置的前两次才被调用......但再也不会了。怎么了?
public class GpsMiniActivity extends Activity implements LocationListener{
private LocationManager mLocMgr;
private TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout rl = new FrameLayout(this.getApplicationContext());
LinearLayout ll= new LinearLayout(this.getApplicationContext());
ll.setOrientation(LinearLayout.VERTICAL);
setContentView(rl);
rl.addView(ll);
tv1=new TextView(getApplicationContext());
ll.addView(tv1);
//setContentView(R.layout.main);
mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
500, 0, this);
}
@Override
public void onLocationChanged(Location location) {
tv1.setText("Lat " + location.getLatitude() + " Long " + location.getLongitude());
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
I'm trying to make a simple activity that reads the GPS position of the user and actualices a simple textview everytime the position of the user changes.
I find some examples en google but all of them are not nice examples, because only capture the position of the user ONE time, and i need that the textview get's actualiced everytime the position changes with the new latitude and longitude of the user.
I tryed to do a thread but it fails and i think it is not necesary to do a thread, im in the wrong way.
Code examples are welcome
EDIT: i'm adding the solution proposed by the user NickT. This solution fails. I dont know why but only actualizes two times the textview, with the two first GPS values that i pass to the emulator with DDMS.... after this the thextview isn't getting actualiced more times... ¿why?. I make a breakpoint in onLocationChanged, and it only get's called the first two times i send a gps positiones... but never more. ¿what is happening?
public class GpsMiniActivity extends Activity implements LocationListener{
private LocationManager mLocMgr;
private TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout rl = new FrameLayout(this.getApplicationContext());
LinearLayout ll= new LinearLayout(this.getApplicationContext());
ll.setOrientation(LinearLayout.VERTICAL);
setContentView(rl);
rl.addView(ll);
tv1=new TextView(getApplicationContext());
ll.addView(tv1);
//setContentView(R.layout.main);
mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
500, 0, this);
}
@Override
public void onLocationChanged(Location location) {
tv1.setText("Lat " + location.getLatitude() + " Long " + location.getLongitude());
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
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绝对最小示例:
您还需要清单中的 ACCESS_FINE_LOCATION 权限和 main.xml 中的 Textview id tv1
Absolute minimum example:
You'll also need permission ACCESS_FINE_LOCATION in your manifest and a Textview id tv1 in main.xml