无法从位置更新中更新 TextView
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【中文标题】无法从位置更新中更新 TextView【英文标题】:Unable to update TextView from location update 【发布时间】:2019-12-17 19:22:20 【问题描述】:我只是获取设备的当前位置并显示在 TextView 上,但 TextView 不显示结果,但是,Java 代码似乎正确地获取了位置,但没有像我尝试过的那样更新 TextView很多相关代码没有位置获取错误。 此外,我使用物理设备来运行应用程序,而不是模拟器。 我最近尝试过的代码如下:
public class roadSideSelection extends AppCompatActivity implements AdapterView.OnItemSelectedListener, LocationListener
int MY_PERMISSION_LOCATION=100;
int MY_PERMISSION_ACCESS_COARSE_LOCATION=100;
protected LocationManager locationManager;
protected Context context;
TextView txtLat;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_road_side_selection);
marshmallowGPSPremissionCheck();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED )
ActivityCompat.requestPermissions(this,
new String[]Manifest.permission.ACCESS_COARSE_LOCATION,
MY_PERMISSION_ACCESS_COARSE_LOCATION);
ActivityCompat.requestPermissions(this,new String[]Manifest.permission.ACCESS_FINE_LOCATION, 1);
txtLat = findViewById(R.id.latitudeTextview);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
@Override
public void onLocationChanged(Location location)
txtLat = findViewById(R.id.latitudeTextview);
String s = getString(R.string.latitude, location.getLatitude(), location.getLongitude());
txtLat.setText(s);
@Override
public void onProviderDisabled(String provider)
Log.d("Latitude","disable");
@Override
public void onProviderEnabled(String provider)
Log.d("Latitude","enable");
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
Log.d("Latitude","status");
private void marshmallowGPSPremissionCheck()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& checkSelfPermission(
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& checkSelfPermission(
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
requestPermissions(
new String[]Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSION_LOCATION);
else
// gps functions.
Toast.makeText(this, "Permission Denied!", Toast.LENGTH_SHORT).show();
@Override
public void onRequestPermissionsResult(int requestCode,
@Nullable String[] permissions,@Nullable int[] grantResults)
if (requestCode == MY_PERMISSION_LOCATION
&& grantResults[0] == PackageManager.PERMISSION_GRANTED)
Toast.makeText(this, "Permission Granted!", Toast.LENGTH_SHORT).show();
else
Toast.makeText(this, "Permission Denied!", Toast.LENGTH_SHORT).show();
'''
Strings.xml
纬度:%1$d;经度:%2$d
【问题讨论】:
日志中有任何错误? 也在 string.xml 中分享你的字符串声明 @Jacks logcat strings.xml 中没有错误:txtLat = (TextView) findViewById(R.id.latitudeTextview);
将视图投射到 TextView 并确保使用正确的视图 ID
【讨论】:
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