android gps distance. EditText alphabet-only validation

Question

my app has two functions, validate the input the user enter. one EditText must be numbers only, one must be alphabet only.no space or special characters. i have done the numbers, but i search there are no alphabet-only validation. so can someone teach me how to loop through EditText and ensure every character is a alphabet? EDIT: i change my code in my afterTextChanged.when i press a alphabet or number in my userTextInout, my app crashed second is to calculate the steps user has taken or just distance by using gps. however my output has nothing. it display nothing. I'm not sure whether it has something to do with the emulator. in my past application, when i click on the emulator control to send gps data, it will not send most of the time, after i click repeatedly on the send button then it can update my location.

i heard there is a new Location API for more accuracy but what is the difference between that and mine? at the Google developer page there are not much detail.

even if i calculated the distance, how do i display it? the setText does not display long. it is my first time using distanceBetween method so i am not familar with it.

XML code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<EditText
    android:id="@+id/textInput"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="58dp"
    android:layout_marginTop="34dp"
    android:ems="5" 
    android:maxLength="100"
    android:inputType="textMultiLine" />


<EditText
    android:id="@+id/numberInput"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textInput"
    android:layout_below="@+id/textInput"
    android:layout_marginTop="64dp"
    android:ems="5"
    android:inputType="number" 
    android:maxLength="3" />

<TextView
    android:id="@+id/Distance"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/numberInput"
    android:layout_marginLeft="37dp"
    android:layout_marginTop="107dp"
    android:text="TextView" />

<TextView
    android:id="@+id/currentLat"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/Distance"
    android:layout_below="@+id/Distance"
    android:layout_marginTop="29dp"
    android:text="TextView" />

<TextView
    android:id="@+id/currentLon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/currentLat"
    android:layout_below="@+id/currentLat"
    android:layout_marginTop="29dp"
    android:text="TextView" />

</RelativeLayout>

Main java code

import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
//import android.view.Menu;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity implements TextWatcher{

protected LocationManager locationManager;
EditText userNumberInput;
EditText userTextInput;
TextView distanceText;
TextView latitude;
TextView longitude;
double lat1,lon1,lat2,lon2;
long dist;
float[] result;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    userNumberInput=(EditText)findViewById(R.id.numberInput);
    userNumberInput.addTextChangedListener(this);
    userTextInput=(EditText)findViewById(R.id.textInput);
    distanceText=(TextView)findViewById(R.id.Distance);
    latitude=(TextView)findViewById(R.id.currentLat);
    longitude=(TextView)findViewById(R.id.currentLon);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);


    Location loc1=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

    Criteria criteria = new Criteria();

    //Get the name of the best provider
    String provider = locationManager.getBestProvider(criteria, true);
    locationManager.requestLocationUpdates(provider, 0, 1, myLocationListener);

    latitude.setText(ToString(loc1.getLatitude()));
    longitude.setText(ToString(loc1.getLongitude()));

    //locationManager.requestLocationUpdates(netprovider, 0, 1, myLocationListener);

}

private CharSequence ToString(double latitude2) {
    // TODO Auto-generated method stub
    return null;
}

LocationListener myLocationListener = new LocationListener() 
{
    public void onLocationChanged(Location loc2) 
    {
        //Location loc2=new Location("");
        lat2=loc2.getLatitude();
        lon2=loc2.getLongitude();
        latitude.setText(ToString(loc2.getLatitude()));
        longitude.setText(ToString(loc2.getLongitude()));
        if(lat1 != 0 && lon1 != 0) { 
           Location.distanceBetween(lat1,lon1,lat2,lon2,result);
           dist+=(long)result[0];
        }
        lat1=lat2;
        lon1=lon2;
        lat2=loc2.getLatitude();
        lon2=loc2.getLongitude();


    distanceText.setText(lat1+","+lon1+","+lat2+","+lon2, dist);




}
private CharSequence ToString(double latitude) {
        // TODO Auto-generated method stub
        return null;
    }
public void onProviderDisabled(String provider)
{
    // Update application if provider disabled.
}
public void onProviderEnabled(String provider)
{
    // Update application if provider enabled.
}
public void onStatusChanged(String provider, int status,
        Bundle extras)
{
    // Update application if provider hardware status changed.
}
};




@Override
public void afterTextChanged(Editable edit) {
            String textFromEditView = edit.toString();
    try
    {
        boolean isOnlyAlphabet = textFromEditView.matches("/^[A-z]+$/");
        if(isOnlyAlphabet == false)
        {
            edit.replace(0, edit.length(), "only alphabets");
        }
    }
    catch(NumberFormatException e){}


}

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
        int arg3) {
    // TODO Auto-generated method stub

}

@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
    // TODO Auto-generated method stub

}}

01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 70
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 70
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[2] is 41
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 65
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 65
01-28 21:33:00.730: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[2] is 69
01-28 21:33:00.740: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.740: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.740: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.740: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.765: D/libEGL(7383): loaded /system/lib/egl/libEGL_mali.so
01-28 21:33:00.765: D/libEGL(7383): loaded /system/lib/egl/libGLESv1_CM_mali.so
01-28 21:33:00.775: D/libEGL(7383): loaded /system/lib/egl/libGLESv2_mali.so
01-28 21:33:00.780: D/(7383): Device driver API match
01-28 21:33:00.780: D/(7383): Device driver API version: 10
01-28 21:33:00.780: D/(7383): User space API version: 10 
01-28 21:33:00.780: D/(7383): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
01-28 21:33:00.815: D/OpenGLRenderer(7383): Enabling debug mode 0
01-28 21:33:00.815: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.815: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.820: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.820: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.825: E/SensorManager(7383): thread start
01-28 21:33:00.825: D/SensorManager(7383): registerListener :: handle = 0  name= LSM330DLC 3-axis Accelerometer delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@424157f0
01-28 21:33:00.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 70
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 70
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 70
01-28 21:33:00.865: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[2] is 41
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 65
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[0] is 77
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[1] is 65
01-28 21:33:00.870: D/TextLayoutCache(7383): TextLayoutCache::replaceThai, prevBuffer[2] is 69
01-28 21:33:01.040: D/SensorManager(7383): unregisterListener::  Listener= android.view.OrientationEventListener$SensorEventListenerImpl@424157f0
01-28 21:33:01.040: D/Sensors(7383): Remain listener = Sending .. normal delay 200ms
01-28 21:33:01.040: I/Sensors(7383): sendDelay --- 200000000
01-28 21:33:01.045: D/SensorManager(7383): JNI - sendDelay
01-28 21:33:01.045: I/SensorManager(7383): Set normal delay = true
01-28 21:33:01.545: W/IInputConnectionWrapper(7383): showStatusIcon on inactive InputConnection
01-28 21:33:10.460: E/SensorManager(7383): thread start
01-28 21:33:10.465: D/SensorManager(7383): registerListener :: handle = 0  name= LSM330DLC 3-axis Accelerometer delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@424157f0
01-28 21:33:12.555: D/SensorManager(7383): unregisterListener::  Listener= android.view.OrientationEventListener$SensorEventListenerImpl@424157f0
01-28 21:33:12.555: D/Sensors(7383): Remain listener = Sending .. normal delay 200ms
01-28 21:33:12.555: I/Sensors(7383): sendDelay --- 200000000
01-28 21:33:12.555: D/SensorManager(7383): JNI - sendDelay
01-28 21:33:12.555: I/SensorManager(7383): Set normal delay = true
01-28 21:33:12.555: D/SensorManager(7383): registerListener :: handle = 0  name= LSM330DLC 3-axis Accelerometer delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@42417a08
01-28 21:33:12.565: W/IInputConnectionWrapper(7383): getSelectedText on inactive InputConnection
01-28 21:33:12.565: W/IInputConnectionWrapper(7383): setComposingText on inactive InputConnection
01-28 21:33:12.565: W/IInputConnectionWrapper(7383): getExtractedText on inactive InputConnection
01-28 21:33:12.675: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:12.675: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:12.680: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:12.680: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.645: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.645: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.645: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:13.645: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.225: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.225: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.225: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.230: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.845: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.845: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.845: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:15.845: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:16.425: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:16.425: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:16.430: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:16.430: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:18.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:18.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:18.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:18.260: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.695: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.695: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.695: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.695: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.860: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.865: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.880: D/dalvikvm(7383): GC_CONCURRENT freed 233K, 7% free 12329K/13191K, paused 13ms+4ms, total 41ms
01-28 21:33:19.995: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.995: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.995: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:19.995: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.245: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.245: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.245: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.245: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.395: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.395: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.395: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.400: E/Dynamiclayout(7383): java.lang.IndexOutOfBoundsException: charAt: 0 >= length 0
01-28 21:33:20.995: D/AndroidRuntime(7383): Shutting down VM
01-28 21:33:20.995: W/dalvikvm(7383): threadid=1: thread exiting with uncaught exception (group=0x4178f2a0)
01-28 21:33:20.995: E/AndroidRuntime(7383): FATAL EXCEPTION: main
01-28 21:33:20.995: E/AndroidRuntime(7383): java.lang.IllegalArgumentException: results is null or has length < 1
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.location.Location.distanceBetween(Location.java:394)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at com.example.validationapp.MainActivity$1.onLocationChanged(MainActivity.java:74)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:263)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:196)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:212)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.os.Looper.loop(Looper.java:137)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at android.app.ActivityThread.main(ActivityThread.java:4898)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at java.lang.reflect.Method.invokeNative(Native Method)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at java.lang.reflect.Method.invoke(Method.java:511)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
01-28 21:33:20.995: E/AndroidRuntime(7383):     at dalvik.system.NativeStart.main(Native Method)
01-28 21:33:30.770: I/Process(7383): Sending signal. PID: 7383 SIG: 9

score 1 · Answer 1 · edited May 23 '17 at 10:31

1

You can validate the input with a Regular Expression. Just use this code (found here: Regular Expression to match only alphabetic characters):

boolean isOnlyAlphabet = userTextInput.matches("/^[A-z]+$/");

For the second question i can't help. Sorry.

edited May 23 '17 at 10:31

Community

1
1

answered Jan 28 '14 at 12:01

mace

73
6

thanks for helping. when i paste the code, there is a error at the matches "the method matches(String) is undefined for the type EditText"after i cast it, it also give and error. by the way, if it works, where do i paste it. at afterTextChanged? – Myst Jan 28 '14 at 12:53
try { boolean isOnlyAlphabet = userTextInput.matches("/^[A-z]+$/"); if(bool == false) { edit.replace(0, edit.length(), "only alphabets"); } } catch(NumberFormatException e){} but afterTextChanged is only allowed to handle one EditText? – Myst Jan 28 '14 at 12:54
its. ok i found the solution. i uses android:digits="qwertzuiopasdfghjklyxcvbnmQWERTZUIOPASDFGHJKLYXCVBNM". it gives me what i want. thanks for the effort! – Myst Jan 28 '14 at 17:06

android gps distance. EditText alphabet-only validation

1 Answers1