[問題] GPS 運作問題

看板AndroidDev作者jerryxin (jerry)時間5年前 (2019/10/10 01:02)推噓0(0推 0噓 1→)

留言1則, 1人參與討論串1/1

後來我嘗試了另外一個sample code做修改 public class MainActivity extends AppCompatActivity { private static final int REQUEST_LOCATION = 1; Button button; TextView textView; LocationManager locationManager; String lattitude,longitude; String lattitude2,longitude2; LocationListener locationListener; public static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION); textView = (TextView)findViewById(R.id.text_location); button = (Button)findViewById(R.id.button_location); button.setOnClickListener(new Button.OnClickListener(){ public void onClick(View v){ locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { buildAlertMessageNoGps(); } else if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { getLocation(); } } }); } private void getLocation() { if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission (MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION); } else { Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); Location location1 = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); Location location2 = locationManager.getLastKnownLocation(LocationManager. PASSIVE_PROVIDER); locationManager.requestLocationUpdates("gps",5000,0,locationListener); if (location != null) { double latti = location.getLatitude(); double longi = location.getLongitude(); lattitude = String.valueOf(latti); longitude = String.valueOf(longi); textView.setText("Your current location is"+ "\n" + "Lattitude = " + lattitude + "\n" + "Longitude = " + longitude); Log.i(TAG,"location"); } else if (location1 != null) { double latti = location1.getLatitude(); double longi = location1.getLongitude(); lattitude = String.valueOf(latti); longitude = String.valueOf(longi); Log.i(TAG,"location1"); textView.setText("Your current location is"+ "\n" + "Lattitude = " + lattitude + "\n" + "Longitude = " + longitude); } else if (location2 != null) { double latti = location2.getLatitude(); double longi = location2.getLongitude(); lattitude = String.valueOf(latti); longitude = String.valueOf(longi); textView.setText("Your current location is"+ "\n" + "Lattitude = " + lattitude + "\n" + "Longitude = " + longitude); Log.i(TAG,"location2"); }else{ Toast.makeText(this,"Unble to Trace your location",Toast.LENGTH_SHORT).show(); Log.i(TAG,"Unable"); } locationListener =new LocationListener() { @Override public void onLocationChanged(Location location) { double latti2 = location.getLatitude(); double longi2 = location.getLongitude(); lattitude2 = String.valueOf(latti2); longitude2 = String.valueOf(longi2); Log.i(TAG,"location1"); textView.setText("Your current location is"+ "\n" + "Lattitude = " + lattitude2 + "\n" + "Longitude = " + longitude2); } public void onStatusChanged (String provider, int status, Bundle extras){ } @Override public void onProviderEnabled(String s) { } @Override public void onProviderDisabled(String s) { } }; } } protected void buildAlertMessageNoGps() { final AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("Please Turn ON your GPS Connection") .setCancelable(false) .setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick(final DialogInterface dialog, final int id) { startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(final DialogInterface dialog, final int id) { dialog.cancel(); } }); final AlertDialog alert = builder.create(); alert.show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } 這個sample code原來是沒有locationListener 也沒有locationManager.requestLocationUpdates(,,,) 加了這串以後 logcat顯示出錯誤 D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.currentgps, PID: 18899 java.lang.IllegalArgumentException: invalid listener: null at android.location.LocationManager.checkListener(LocationManager.java:2344) at android.location.LocationManager.requestLocationUpdates(LocationManager.java:557) at com.example.currentgps.MainActivity.getLocation(MainActivity.java:87) at com.example.currentgps.MainActivity.access$000(MainActivity.java:31) at com.example.currentgps.MainActivity$1.onClick(MainActivity.java:60) at android.view.View.performClick(View.java:6597) at android.view.View.performClickInternal(View.java:6574) at android.view.View.access$3100(View.java:778) at android.view.View$PerformClick.run(View.java:25885) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) I/Process: Sending signal. PID: 18899 SIG: 9 Process 18899 terminated. 這個sample code能成功顯示出目前的GPS location 但是我希望5秒更新一次後續我想要把所有的GPS location記錄下來,然後發到email上但是目前嘗試了很多看了網上的教學只要用到locationManager.requestLocationUpdates()就不成功可以請高手幫忙看看這個報錯是哪裡有問題嗎? -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 172.58.27.173 (美國) ※ 文章網址: https://www.ptt.cc/bbs/AndroidDev/M.1570640533.A.8D5.html