package my.anupamroy.smartcanteenapp.activities;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import java.util.HashMap;
import my.anupamroy.smartcanteenapp.Constants;
import my.anupamroy.smartcanteenapp.R;
public class AddProductActivity extends AppCompatActivity {
//ui views
private ImageButton backBtn;
private ImageView productIconTv;
private EditText titleEt,descriptionEt,quantityEt,priceEt;
private TextView categoryTv;
private Button addProductBtn;
//permission Constants
private static final int CAMERA_REQUEST_CODE=200;
private static final int STORAGE_REQUEST_CODE=300;
//image pick constants
private static final int IMAGE_PICK_GALLERY_CODE=400;
private static final int IMAGE_PICK_CAMERA_CODE=500;
//permission arrays
private String[] cameraPermissions;
private String[] storagePermissions;
//image picked uri
private Uri image_uri;
private FirebaseAuth firebaseAuth;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_product);
//init ui views
backBtn=findViewById(R.id.backBtn);
productIconTv=findViewById(R.id.productIconIv);
titleEt=findViewById(R.id.titleEt);
descriptionEt=findViewById(R.id.descriptionEt);
categoryTv=findViewById(R.id.categoryTv);
quantityEt=findViewById(R.id.quantityEt);
priceEt=findViewById(R.id.priceEt);
addProductBtn=findViewById(R.id.addProductBtn);
firebaseAuth=FirebaseAuth.getInstance();
//setup progress dialog
progressDialog=new ProgressDialog(this);
progressDialog.setTitle("Please wait");
progressDialog.setCanceledOnTouchOutside(false);
//init permission arrays
cameraPermissions=new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE};
storagePermissions=new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE};
backBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
onBackPressed();
}
});
productIconTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//show dialog to pick image
showImagePickDialog();
}
});
categoryTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//pick category
categoryDialog();
}
});
addProductBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Flow:
//1.Input Data
//2.Validate Data
//3.Add data to db
inputData();
}
});
}
private String productTitle,productDescription,productCategory,productQuantity,originalPrice;
private void inputData() {
//1. input data
productTitle = titleEt.getText().toString().trim();
productDescription = descriptionEt.getText().toString().trim();
productCategory = categoryTv.getText().toString().trim();
productQuantity = quantityEt.getText().toString().trim();
originalPrice = priceEt.getText().toString().trim();
//2.Validate Data
if (TextUtils.isEmpty(productTitle)) {
Toast.makeText(this, "Title is required", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(productCategory)) {
Toast.makeText(this, "Category is required", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(productQuantity)) {
Toast.makeText(this, "Quantity is required", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(originalPrice)) {
Toast.makeText(this, "Price is required", Toast.LENGTH_SHORT).show();
return;
}
addProduct();
}
private void addProduct() {
//3. Add data to db
progressDialog.setMessage("Adding Product...");
progressDialog.show();
final String timestamp="" System.currentTimeMillis();
if(image_uri==null){
//upload without image
//set data to upload
HashMap<String ,Object>hashMap=new HashMap<>();
hashMap.put("productId","" timestamp);
hashMap.put("productTitle","" productTitle);
hashMap.put("productDescription","" productDescription);
hashMap.put("productCategory","" productCategory);
hashMap.put("productQuantity","" productQuantity);
hashMap.put("productIcon","");//no image, set empty
hashMap.put("originalPrice","" originalPrice);
hashMap.put("timestamp","" timestamp);
hashMap.put("uid","" firebaseAuth.getUid());
//add to db
DatabaseReference reference= FirebaseDatabase.getInstance().getReference("Users");
reference.child(firebaseAuth.getUid()).child("Products").child(timestamp).setValue(hashMap)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
//db updated
progressDialog.dismiss();
Toast.makeText(AddProductActivity.this, "Product Added...", Toast.LENGTH_SHORT).show();
clearData();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
//failed updating db
progressDialog.dismiss();
Toast.makeText(AddProductActivity.this, "" e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
else{
//upload with image
//first upload image to storage
//name and path of the image to be uploaded
String filePathAndName="product_images/" "" timestamp;
StorageReference storageReference= FirebaseStorage.getInstance().getReference(filePathAndName);
storageReference.putFile(image_uri)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
//get url of uploaded image
Task<Uri> uriTask=taskSnapshot.getStorage().getDownloadUrl();
while (!uriTask.isSuccessful());
Uri downloadImageUri=uriTask.getResult();
if(uriTask.isSuccessful()){
HashMap<String ,Object>hashMap=new HashMap<>();
hashMap.put("productId","" timestamp);
hashMap.put("productTitle","" productTitle);
hashMap.put("productDescription","" productDescription);
hashMap.put("productCategory","" productCategory);
hashMap.put("productQuantity","" productQuantity);
hashMap.put("productIcon","" downloadImageUri);
hashMap.put("originalPrice","" originalPrice);
hashMap.put("timestamp","" timestamp);
hashMap.put("uid","" firebaseAuth.getUid());
//add to db
DatabaseReference reference= FirebaseDatabase.getInstance().getReference("Users");
reference.child(firebaseAuth.getUid()).child("Products").child(timestamp).setValue(hashMap)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
//db updated
progressDialog.dismiss();
Toast.makeText(AddProductActivity.this, "Product Added...", Toast.LENGTH_SHORT).show();
clearData();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
//failed updating db
progressDialog.dismiss();
Toast.makeText(AddProductActivity.this, "" e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
progressDialog.dismiss();
Toast.makeText(AddProductActivity.this, "" e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
}
private void clearData(){
//clear data after uploading product
titleEt.setText("");
descriptionEt.setText("");
categoryTv.setText("");
quantityEt.setText("");
priceEt.setText("");
productIconTv.setImageResource(R.drawable.ic_add_shopping_primary);
image_uri=null;
}
private void categoryDialog() {
//dialog
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Product Category")
.setItems(Constants.productCategories, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int which) {
//get picked category
String category=Constants.productCategories[which];
//set picked category
categoryTv.setText(category);
}
})
.show();
}
private void showImagePickDialog() {
//options to display in dialog
String[] options={"Camera","Gallery"};
//dialog
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Pick Image")
.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//handle clicks
if(which==0){
//camera clicked
if(checkCameraPermission()){
//camera permission allowed
pickFromCamera();
}
else{
//not allowed, request
requestCameraPermission();
}
}
else{
//gallery clicked
if(checkStoragePermission()){
//storage Permissions allowed
pickFromGallery();
}
else{
//not allowed request
requestStoragePermission();
}
}
}
})
.show();
}
private void pickFromGallery(){
//intent to pick image from gallery
Intent intent=new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent,IMAGE_PICK_GALLERY_CODE);
}
private void pickFromCamera(){
//intent to pick image from camera
//using media store to pick original image
ContentValues contentValues=new ContentValues();
contentValues.put(MediaStore.Images.Media.TITLE,"Temp_Image_Title");
contentValues.put(MediaStore.Images.Media.DESCRIPTION,"Temp_Image_Description");
image_uri=getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,contentValues);
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT,image_uri);
startActivityForResult(intent,IMAGE_PICK_CAMERA_CODE);
}
private boolean checkStoragePermission(){
boolean result= ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE)==
(PackageManager.PERMISSION_GRANTED);
return result;//return true/false
}
private void requestStoragePermission(){
ActivityCompat.requestPermissions(this,storagePermissions,STORAGE_REQUEST_CODE);
}
private boolean checkCameraPermission(){
boolean result=ContextCompat.checkSelfPermission(this,Manifest.permission.CAMERA)==
(PackageManager.PERMISSION_GRANTED);
boolean result1=ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE)==
(PackageManager.PERMISSION_GRANTED);
return result && result1;
}
private void requestCameraPermission(){
ActivityCompat.requestPermissions(this,cameraPermissions,CAMERA_REQUEST_CODE);
}
//handle permission results
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case CAMERA_REQUEST_CODE:{
if(grantResults.length>0){
boolean cameraAccepted=grantResults[0]==PackageManager.PERMISSION_GRANTED;
boolean storageAccepted=grantResults[1]==PackageManager.PERMISSION_GRANTED;
if(cameraAccepted && storageAccepted){
//permission allowed
pickFromCamera();
}
else{
//permission denied
Toast.makeText(this,"Camera and Storage Permissions are necessary...",Toast.LENGTH_SHORT).show();
}
}
}
break;
case STORAGE_REQUEST_CODE:{
if(grantResults.length>0){
boolean storageAccepted=grantResults[0]==PackageManager.PERMISSION_GRANTED;
if(storageAccepted){
//permission allowed
pickFromGallery();
}
else{
//permission denied
Toast.makeText(this,"Storage Permission is required...",Toast.LENGTH_SHORT).show();
}
}
}
break;
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
//handle image pick results
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (resultCode==RESULT_OK){
if (requestCode==IMAGE_PICK_GALLERY_CODE){
//get picked image
image_uri=data.getData();
//set to imageview
productIconTv.setImageURI(image_uri);
}
else if(requestCode==IMAGE_PICK_CAMERA_CODE){
//set to image view
productIconTv.setImageURI(image_uri);
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}
LAYOUT FILE:
<?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:orientation="vertical"
tools:context=".activities.AddProductActivity">
<!--Toolbar-->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:padding="10dp"
android:background="@drawable/shape_rect01">
<ImageButton
android:id="@ id/backBtn"
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@null"
android:src="@drawable/ic_back_white" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Add Product"
android:textColor="@color/colorWhite"
android:textSize="20sp"
android:textStyle="bold"/>
</RelativeLayout>
<!--Form to input data-->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="60dp">
<com.blogspot.atifsoftwares.circularimageview.CircularImageView
android:id="@ id/productIconIv"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:src="@drawable/ic_add_shopping_primary"
app:c_border="true"
app:c_border_color="@color/colorPrimaryDark"
app:c_border_width="1dp" />
<EditText
android:id="@ id/titleEt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/productIconIv"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:background="@drawable/shape_rect02"
android:drawableStart="@drawable/ic_title_gray"
android:drawablePadding="10dp"
android:hint="Title"
android:inputType="textPersonName|textCapWords"
android:padding="10dp" />
<EditText
android:id="@ id/descriptionEt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/titleEt"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:background="@drawable/shape_rect02"
android:drawableStart="@drawable/ic_title_gray"
android:drawablePadding="10dp"
android:hint="Description"
android:inputType="textPersonName|textCapWords"
android:padding="10dp" />
<TextView
android:id="@ id/categoryTv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/descriptionEt"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:background="@drawable/shape_rect02"
android:drawableStart="@drawable/ic_baseline_apps_gray"
android:drawableEnd="@drawable/ic_down_gray"
android:drawablePadding="10dp"
android:hint="Category"
android:inputType="textPersonName|textCapWords"
android:padding="10dp" />
<EditText
android:id="@ id/quantityEt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/categoryTv"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:background="@drawable/shape_rect02"
android:drawableStart="@drawable/ic_cart_gray"
android:drawablePadding="10dp"
android:hint="Quantity"
android:inputType="text"
android:padding="10dp" />
<EditText
android:id="@ id/PriceEt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/quantityEt"
android:layout_marginStart="5dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="5dp"
android:layout_marginBottom="5dp"
android:background="@drawable/shape_rect02"
android:drawableStart="@drawable/ic_baseline_currency_rupee_24"
android:drawablePadding="10dp"
android:hint="Price"
android:inputType="numberDecimal"
android:padding="10dp" />
<Button
android:id="@ id/addProductBtn"
style="@style/Widget.AppCompat.Button.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/PriceEt"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:minWidth="150dp"
android:text="Add Product"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
In LOGCAT I AM getting the following errors in line number 132,43,119
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
**my.anupamroy.smartcanteenapp.activities.AddProductActivity.inputData(AddProductActivity.java:132)** at my.anupamroy.smartcanteenapp.activities.AddProductActivity.access$200(AddProductActivity.java:43) *at my.anupamroy.smartcanteenapp.activities.AddProductActivity$4.onClick(AddProductActivity.java:119)**
Please Help me out of this error from many days i am struggling with this error
CodePudding user response：
Check your EditText in XML showing PriceEt and
in Activity its initialized as
priceEt = findViewById(R.id.**priceEt**);
Change that from XML file either in Activity and try once.
CodePudding user response：
error is in this line
priceEt=findViewById(R.id.priceEt);
replace priceEt with PriceEt inside
Old code
priceEt=findViewById(R.id.priceEt);
New code
priceEt=findViewById(R.id.PriceEt);