java EditText整数\输入\类型在null时崩溃
为避免不必要的内容，单击“更新、删除、插入”按钮时会调用“验证”功能。问题在于{validate_price()和validate_supplier_no()有问题。请纠正我
public class QueryActivity extends AppCompatActivity {
private EditText etName, etPrice, etSupplier, etSNumber;
private Button insert_btn, increment, decrement, update_btn, delete_btn, call_btn;
private TextView quantity_tv;
private int quantity_value = 0;
private TextInputLayout inputLayout_name, inputLayout_price, inputLayout_supplier, inputLayout_supplier_no;
int _id, price, quantity, supplier_no = 0;
String name, supplier;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_query);
increment = findViewById(R.id.increment);
decrement = findViewById(R.id.decrement);
insert_btn = findViewById(R.id.insert_btn);
update_btn = findViewById(R.id.update_product);
delete_btn = findViewById(R.id.delete_product);
call_btn = findViewById(R.id.call_btn);
etName = findViewById(R.id.et_name);
etPrice = findViewById(R.id.et_price);
quantity_tv = findViewById(R.id.quantity);
etSupplier = findViewById(R.id.et_supplier);
etSNumber = findViewById(R.id.et_sNumber);
inputLayout_name = findViewById(R.id.textInput_name);
inputLayout_price = findViewById(R.id.textInput_price);
inputLayout_supplier = findViewById(R.id.textInput_supplier);
inputLayout_supplier_no = findViewById(R.id.textInput_supplier_no);
Intent intent = getIntent();
_id = intent.getIntExtra("_id", 0);
name = intent.getStringExtra("name");
price = intent.getIntExtra("price", 0);
quantity = intent.getIntExtra("quantity", 0);
quantity_value = quantity;
supplier = intent.getStringExtra("supplier");
supplier_no = intent.getIntExtra("supplier_no", 0);
String price_str = String.valueOf(price);
if (_id != 0) {
etName.setText(name.toString());
etPrice.setText(String.valueOf(price));
quantity_tv.setText(String.valueOf(quantity).toString());
etSupplier.setText(supplier.toString());
etSNumber.setText(String.valueOf(supplier_no));
insert_btn.setVisibility(View.GONE);
} else {
update_btn.setVisibility(View.GONE);
delete_btn.setVisibility(View.GONE);
}
//OnClickListeners
insert_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
validate(v);
insertProduct();
}
});
update_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
validate(v);
updateProduct();
}
});
delete_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
validate(v);
deleteProduct();
}
});
//add quantity btn
increment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
quantity_value += 1;
display(quantity_value);
}
});
//subtract quantity btn
decrement.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
quantity_value -= 1;
if (quantity_value <= -1) {
quantity_value = 0;
}
display(quantity_value);
}
});
call_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(supplier_no==0){
Toast.makeText(getApplicationContext(),"Please Enter Supplier Number",Toast.LENGTH_SHORT).show();
}
else {
Intent intent_call = new Intent(Intent.ACTION_DIAL, Uri.fromParts("tel", String.valueOf(supplier_no), null));
startActivity(intent_call);
}
}
});
}//onCreate Ends
public void validate(View view) {
try {
if (validate_name() && validate_price() && validate_supplier() && validate_supplier_no()) {
Toast.makeText(getApplicationContext(), "Success!", Toast.LENGTH_SHORT).show();
}
}
catch (NumberFormatException e){
Toast.makeText(getApplicationContext(), "Not Success!", Toast.LENGTH_SHORT).show();
}
}
private boolean validate_supplier_no() {
if (TextUtils.isEmpty(etSNumber.getText().toString())) {
inputLayout_supplier_no.setError("Invalid input");
return false;
} else {
inputLayout_supplier_no.setErrorEnabled(false);
return true;
}
}
private boolean validate_supplier() {
if (etSupplier.getText().toString().isEmpty()) {
inputLayout_supplier.setError("Supplier cannot be blanked");
return false;
} else {
inputLayout_supplier.setErrorEnabled(false);
return true;
}
}
private boolean validate_price() {
if (TextUtils.isEmpty(etPrice.getText().toString())) {
inputLayout_price.setError("Invalid input");
return false;
} else {
inputLayout_price.setErrorEnabled(false);
return true;
}
}
private boolean validate_name() {
if (etName.getText().toString().isEmpty()) {
inputLayout_name.setError("Name cannot be blanked");
return false;
} else {
inputLayout_name.setErrorEnabled(false);
return true;
}
}
private void deleteProduct() {
String selection = _ID + " = ? ";
String[] selectionArgs = {String.valueOf(_id)};
Uri uri = ContentUris.withAppendedId(CONTENT_URI, _id);
int rowsDeleted = getContentResolver().delete(uri, selection, selectionArgs);
}
private void updateProduct() {
String selection = _ID + " = ? ";
String[] selectionArgs = {String.valueOf(_id)};
String et_productName = etName.getText().toString();
int et_productPrice = Integer.parseInt(etPrice.getText().toString());
int tv_productQuantity = Integer.parseInt(quantity_tv.getText().toString());
String et_productSupplier = etSupplier.getText().toString();
int et_productSNumber = Integer.parseInt(etSNumber.getText().toString());
ContentValues values = new ContentValues();
values.put(PRODUCT_NAME, et_productName);
values.put(PRICE, et_productPrice);
values.put(QUANTITY, tv_productQuantity);
values.put(SUPPLIER, et_productSupplier);
values.put(SUPPLIER_NO, et_productSNumber);
Uri uri = CONTENT_URI;
int rowsUpdated = getContentResolver().update(uri, values, selection, selectionArgs);
Toast.makeText(this, "Item inserted at: " + rowsUpdated, Toast.LENGTH_SHORT).show();
}
private void insertProduct() {
String et_productName = etName.getText().toString();
int et_productPrice = Integer.parseInt(etPrice.getText().toString());
int tv_productQuantity = Integer.parseInt(quantity_tv.getText().toString());
String et_productSupplier = etSupplier.getText().toString();
int et_productSNumber = Integer.parseInt(etSNumber.getText().toString());
ContentValues values = new ContentValues();
values.put(PRODUCT_NAME, et_productName);
values.put(PRICE, et_productPrice);
values.put(QUANTITY, tv_productQuantity);
values.put(SUPPLIER, et_productSupplier);
values.put(SUPPLIER_NO, et_productSNumber);
Uri uri = CONTENT_URI;
Uri uriRowsInserted = getContentResolver().insert(uri, values);
Toast.makeText(this, "Item inserted at: " + uriRowsInserted, Toast.LENGTH_SHORT).show();
}
//for updating the quantity_tv
public void display(int number) {
quantity_tv.setText(String.valueOf(number));
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
安卓:background="#e0e0e0"
安卓:orientation="vertical"
tools:context=".QueryActivity"
>
<安卓.support.design.widget.TextInputLayout
安卓:id="@+id/textInput_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content">
<EditText
安卓:id="@+id/et_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:hint="Enter Product Name..."
安卓:inputType="text" />
</安卓.support.design.widget.TextInputLayout>
<安卓.support.design.widget.TextInputLayout
安卓:id="@+id/textInput_price"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content">
<EditText
安卓:id="@+id/et_price"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:hint="Enter Product Price..."
安卓:inputType="number" />
</安卓.support.design.widget.TextInputLayout>
<LinearLayout
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:gravity="center_horizontal"
安卓:orientation="horizontal">
<Button
安卓:id="@+id/increment"
安卓:layout_width="55dp"
安卓:layout_height="wrap_content"
安卓:text="+" />
<TextView
安卓:id="@+id/quantity"
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:layout_margin="10dp"
安卓:text="0"
安卓:textSize="24sp" />
<Button
安卓:id="@+id/decrement"
安卓:layout_width="55dp"
安卓:layout_height="wrap_content"
安卓:text="-" />
</LinearLayout>
<安卓.support.design.widget.TextInputLayout
安卓:id="@+id/textInput_supplier"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content">
<EditText
安卓:id="@+id/et_supplier"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:hint="Enter Supplier Name..."
安卓:inputType="text" />
</安卓.support.design.widget.TextInputLayout>
<安卓.support.design.widget.TextInputLayout
安卓:id="@+id/textInput_supplier_no"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content">
<EditText
安卓:id="@+id/et_sNumber"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:hint="Enter SupplierNumber..."
安卓:inputType="number" />
</安卓.support.design.widget.TextInputLayout>
<LinearLayout
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:layout_marginTop="16dp"
安卓:gravity="center_horizontal"
安卓:orientation="vertical">
<Button
安卓:id="@+id/insert_btn"
安卓:layout_width="150dp"
安卓:layout_height="wrap_content"
安卓:layout_marginBottom="10dp"
安卓:background="@drawable/button_layout"
安卓:text="ADD IT" />
<Button
安卓:id="@+id/delete_product"
安卓:layout_width="150dp"
安卓:layout_height="wrap_content"
安卓:layout_marginBottom="10dp"
安卓:background="@drawable/button_layout"
安卓:text="DELETE IT" />
<Button
安卓:id="@+id/update_product"
安卓:layout_width="150dp"
安卓:layout_height="wrap_content"
安卓:layout_marginBottom="10dp"
安卓:background="@drawable/button_layout"
安卓:text="Save Changes" />
<Button
安卓:id="@+id/call_btn"
安卓:layout_width="150dp"
安卓:layout_height="wrap_content"
安卓:background="@drawable/button_layout"
安卓:drawableLeft="@drawable/call"
安卓:drawablePadding="-40dp"
安卓:text="CALL" />
</LinearLayout>
</LinearLayout>
注意：对于空的etPrice或etSNumber，此代码抛出java.lang.NumberFormatException: Invalid int: ""
# 1 楼答案
您可以为EditText设置错误，而不是为布局设置错误。因此，您可以通过以下方式重写代码：
# 2 楼答案
仅当输入有效时，才应调用insertProduct、deleteProduct和updateProduct。更改您的验证方法，如下所示
并开始使用