ProfileActivity.java;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
public class ProfileActivity extends AppCompatActivity implements View.OnClickListener {
//firebase auth object
private FirebaseAuth firebaseAuth;
//view objects
public TextView textViewUserEmail;
private Button buttonLogout,btnGet;
public EditText edtxtLati, edtxtLongi;
private LocationManager locationManager;
private LocationListener locationListener;
private Double lati, longi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
lati = location.getLatitude();
edtxtLati.append("" + lati);
longi = location.getLongitude();
edtxtLongi.append("" + longi);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
};
//VERSION AND PERMISSION CHECKING
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
requestPermissions(new String[]{
Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.INTERNET}, 10);
return;
}
} else {
configureButton();
}
//initializing firebase authentication object
firebaseAuth = FirebaseAuth.getInstance();
//if the user is not logged in
//that means current user will return null
if (firebaseAuth.getCurrentUser() == null) {
//closing this activity
finish();
//starting login activity
startActivity(new Intent(this, LoginActivity.class));
}
//getting current user
FirebaseUser user = firebaseAuth.getCurrentUser();
//initializing views
textViewUserEmail = (TextView) findViewById(R.id.textViewUserEmail);
buttonLogout = (Button) findViewById(R.id.buttonLogout);
edtxtLati = (EditText)findViewById(R.id.edtxtLati);
edtxtLongi = (EditText)findViewById(R.id.edtxtLongi);
btnGet = (Button)findViewById(R.id.btnGet);
//displaying logged in user name
textViewUserEmail.setText("Welcome "+user.getEmail());
//adding listener to button
buttonLogout.setOnClickListener(this);
}
public void onRequestPermissionsResult(int requestCode, String[] permission, int[] grantResults) {
switch(requestCode)
{
case 10:
if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
configureButton();
}
}
private void configureButton() {
btnGet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);
}
});
}
@Override
public void onClick(View view) {
//if logout is pressed
if (view == buttonLogout) {
//logging out the user
firebaseAuth.signOut();
//closing activity
finish();
//starting login activity
startActivity(new Intent(this, LoginActivity.class));
}
}
}
/AndroidRuntime을 무엇을해야 btnGet가 작동하지 않는 버튼 : 치명적인 예외 : 주요 프로세스 : com.praful.lochub, PID : 3742 java.lang.RuntimeException가 : 실패 제공하는 결과 ResultInfo { {act = android.content.pm.action.REQUEST_PERMISSIONS (엑스트라가 있음)}}에서 으로 이동 {com.praful.lochub/com.praful.lochub.ProfileActivity} : java.lang.NullPointerException : 가상 메소드 'void를 호출하려고 시도했습니다. void android.widget.Button.setOnClickListener (android.view.View $ OnCl ickListener) '에서 android.app.ActivityThread.- android.app.ActivityThread.handleSendResult (ActivityThread.java:4096) 에서 android.app.ActivityThread.deliverResults (ActivityThread.java:4053) 에서 널 객체 참조 에 wrap20 (ActivityThread.java) at android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1516) at android.os.Handler.dispatchMessage (Handler.java:102) android.os.Looper.loop에서 Looper.java:154) android.app.ActivityThread.main (ActivityThread.java:6077) at java.lang.reflect.Method.invoke (기본 메소드) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller .run (ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:755) 에 의해 발생 : java.lang.NullPointerException : 가상 메서드 'void를 호출하려고 시도'void android.widget.Button.setOnClickListener (android.view. 보기 $ OnClickListener를) '안드로이드에서 com.praful.lochub.ProfileActivity.onRequestPermissionsResult (ProfileActivity.java:115) 에서 com.praful.lochub.ProfileActivity.configureButton (ProfileActivity.java:121) 에서 null 객체 참조 에 .app.Activity.dispatchRequestPermissionsResult (Activity.java:7069) and35.p.Activity.dispatchActivityResult android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1516) 에서 android.app.ActivityThread.-wrap20 (ActivityThread.java) 에서에서 android.app.ActivityThread.handleSendResult (ActivityThread.java:4096) 에서 android.os.Handler.dispatchMessage (Handler.java:102) (android.os.Looper.loop (Looper.java:154) at android.app.ActivityThread.main (ActivityThread.java:6077) at java. img.Invoke (네이티브 메소드) : 755) 응용 프로그램이 종료되었습니다.내가
activity_profile.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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="com.praful.lochub.ProfileActivity"
android:background="#ffffff">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textViewUserEmail"
android:layout_gravity="center_horizontal"
android:fontFamily="casual"
android:textColor="@color/colorAccent"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Logout"
android:id="@+id/buttonLogout"
android:layout_gravity="center_horizontal"
android:fontFamily="casual"
android:textColor="@color/common_google_signin_btn_text_dark_default"
android:textStyle="normal|bold"
android:textAllCaps="false"
android:textSize="18sp"
android:background="@color/colorAccent"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_alignBottom="@+id/textViewUserEmail" />
<Button
android:text="Get Location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnGet"
style="@style/Widget.AppCompat.Button.Colored"
android:fontFamily="casual"
android:textStyle="normal|bold"
android:textAllCaps="false"
android:textSize="16sp"
android:layout_below="@+id/edtxtLongi"
android:layout_centerHorizontal="true" />
<ImageButton
android:background="@drawable/showonmap"
android:layout_width="50dip"
android:layout_height="50dip"
android:layout_below="@+id/edtxtLongi"
android:layout_alignParentEnd="true"
android:layout_marginEnd="12dp"
android:id="@+id/imgbtnMap" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/edtxtLati"
android:hint="Latitude"
android:textAlignment="center"
android:fontFamily="casual"
android:layout_marginTop="15dp"
android:layout_below="@+id/textViewUserEmail"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/edtxtLongi"
android:fontFamily="casual"
android:hint="Longitude"
android:textAlignment="center"
android:layout_below="@+id/edtxtLati"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/loc"
android:id="@+id/imgbtnLocate"
android:background="@null"
android:layout_marginBottom="22dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
nullpointerexception은 DEBUG를 의미합니다. 디버그를 사용하여 오류를 던지는 줄에서 멈추고, 무엇이 null인지 확인하고 해결하십시오. 문제가있는 예외 상황에서 작성되었습니다. 당신은 버튼 null을 가지고, 그것은 당신이 잘못된 xml id 나 비슷한 것을 가리킨다는 것을 의미합니다. –