问题
I am trying to prompt the user to enable gps, i tried many times to resolve issues but not able to clear it.I am new to android can any one please help me........ My mainactivity.java,
public class MainActivity extends AppCompatActivity {
private WebView view;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView.setWebContentsDebuggingEnabled(true);
WebView view = (WebView) this.findViewById(R.id.webView);
view.loadUrl("https://google.com");
view.getSettings().setJavaScriptEnabled(true);
view.getSettings().setDomStorageEnabled(true);
view.getSettings().setDatabaseEnabled(true);
view.getSettings().setAppCacheEnabled(true);
view.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
view.getSettings().setUseWideViewPort(true);
view.getSettings().setLoadWithOverviewMode(true);
view.getSettings().setBuiltInZoomControls(false);
view.getSettings().setAllowUniversalAccessFromFileURLs(true);
view.getSettings().setAllowContentAccess(true);
view.setWebChromeClient(new WebChromeClient());
view.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
view.setScrollbarFadingEnabled(false);
view.getSettings().setBuiltInZoomControls(true);
view.getSettings().setPluginState(PluginState.ON);
view.getSettings().setAllowFileAccess(true);
view.getSettings().setSupportZoom(true);
CheckEnableGPS();
}
private void CheckEnableGPS(){
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.equals("")){
//GPS Enabled
Toast.makeText(AndroidEnableGPS.this, "GPS Enabled: " + provider,
Toast.LENGTH_LONG).show();
}else {
Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
startActivity(intent);
}
}
}
my androidmanifest.xml,
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="test.test">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
回答1:
Implement LocationListener :
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider)
{
if (provider.equals(LocationManager.GPS_PROVIDER))
{
showGPSDiabledDialog();
}
}
Show dialog to open Settings:
public void showGPSDiabledDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("GPS Disabled");
builder.setMessage("Gps is disabled, in order to use the application properly you need to enable GPS of your device");
builder.setPositiveButton("Enable GPS", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startActivityForResult(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS), GPS_ENABLE_REQUEST);
}
}).setNegativeButton("No, Just Exit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
mGPSDialog = builder.create();
mGPSDialog.show();
}
In your onCreate Method call :
LocationManager mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
And override onActivityResult method to test if the user activated GPS correctly.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == GPS_ENABLE_REQUEST) {
if (mLocationManager == null) {
mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
}
if (!mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
showGPSDiabledDialog();
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
回答2:
Full example :
/**
* Function to check if best network provider
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// Setting Icon to Dialog
//alertDialog.setIcon(R.drawable.delete);
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
Here is the doc : http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/ (copied point 7)
回答3:
Check this official document: https://developer.android.com/training/permissions/requesting.html Also, the accepted answer on this thread is the one I used to prompt for storage write access and it works perfectly fine: Android 6.0 Marshmallow. Cannot write to SD Card You only need to workout the keywords for location access.
回答4:
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener ,OnMapReadyCallback,LocationListener{
protected static final String TAG = "MainActivity";
protected static final int REQUEST_CHECK_SETTINGS = 0x1;
Marker mCurrLocationMarker;
GoogleMap mgooglemap;
private LocationManager locationManager;
@Override
public void onLocationChanged(Location location) {
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
// MarkerOptions markerOptions = new MarkerOptions();
// markerOptions.position(latLng);
// markerOptions.title("Current Position");
// markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
// mCurrLocationMarker = mgooglemap.addMarker(markerOptions);
//move map camera
mgooglemap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,16));
mgooglemap.getMaxZoomLevel();
// locationManager.removeUpdates(this);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Toast.makeText(MainActivity.this, "Please Enable GPS", Toast.LENGTH_LONG).show();
}
The onProviderDisabled() of the above code will provide you the required flow.
Pls upvote the answer if useful!
来源：https://stackoverflow.com/questions/38566490/how-to-prompt-user-to-enable-gps