Question

尝试了多种解决此问题的方法，但到目前为止没有任何效果，错误仅发生在click上，因此请确保其在我的 orderSummaryTextView_andPrice，但我似乎找不到问题。你们中有人可以发现我做错了吗？

Java主类：

公共类MainActivity扩展了AppCompatActivity {

Button minusOneButton, plusOneButton, orderButton;
TextView quanityTextView, orderSummaryTextView_andPrice;
CheckBox whipped_cream_check_box, chocolate_checkBox;
EditText user_inputted_name;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    minusOneButton = findViewById(R.id.minusOneButton);
    plusOneButton =  findViewById(R.id.plusOneButton);
    orderButton =  findViewById(R.id.orderButton);
    whipped_cream_check_box =  findViewById(R.id.whipped_cream_check_box);
    chocolate_checkBox =  findViewById(R.id.chocolate_checkBox);
    user_inputted_name = findViewById(R.id.user_inputted_name);
    quanityTextView = (TextView) findViewById(R.id.quanityTextView);
    orderSummaryTextView_andPrice = findViewById(R.id.orderSummaryTextView_andPrice);


}

// coffee will cost 1 dollar with an added dollar for each topping

int quanity = 0;

public void submitOrder(View view) {
    calculatePrice();
    createOrderSummery();
}

public void createOrderSummery(){ // titl

    EditText userName = (EditText) findViewById(R.id.user_inputted_name);

    orderSummaryTextView_andPrice.setText(String.valueOf("Name: " + userName.getText().toString() +
            "\nAdd whipped creame? "+ whipped_cream_check_box.isChecked()+
            "\nAdd chocolate? " + chocolate_checkBox.isChecked() +
            "\nQuanity: " + quanity +
            "\nTotal: $" + orderSummaryTextView_andPrice.getText() +
            "\nThank you!")); // creats the summery text onclick
    Log.d("MainActivity.class","Create order summary method finished");
}


public void calculatePrice(){
    int price = Integer.parseInt(orderSummaryTextView_andPrice.getText().toString()); // price = the value of textview 2 in int form
    displayMessage(price); // external method

}
public void displayMessage(int number){
    TextView orderSummaryTextView = (TextView) findViewById(R.id.orderSummaryTextView_andPrice); // price = order_summary_text_view
    orderSummaryTextView.setText(String.valueOf(number)); // converted back to a string then displays
}


public void increment(View view) {
    quanity += 1; // this is just a global var
    quanityTextView.setText(String.valueOf(quanity));//we're converting quanity into a string with  the empty quotes so it can be displayed
}

public void decrement(View view) {
    quanity -= 1;
    quanityTextView.setText(String.valueOf(quanity));

}

}

Logcat错误：

2019-01-22 12:37:30.126 23015-23015/com.example.coffee E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.coffee, PID: 23015
java.lang.IllegalStateException: Could not execute method for android:onClick
    at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390)
    at android.view.View.performClick(View.java:6308)
    at android.widget.TextView.performClick(TextView.java:11202)
    at android.view.View$PerformClick.run(View.java:23969)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6816)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
    at android.view.View.performClick(View.java:6308) 
    at android.widget.TextView.performClick(TextView.java:11202) 
    at android.view.View$PerformClick.run(View.java:23969) 
    at android.os.Handler.handleCallback(Handler.java:751) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:154) 
    at android.app.ActivityThread.main(ActivityThread.java:6816) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451) 
 Caused by: java.lang.NumberFormatException: For input string: ""
    at java.lang.Integer.parseInt(Integer.java:533)
    at java.lang.Integer.parseInt(Integer.java:556)
    at com.example.coffee.MainActivity.calculatePrice(MainActivity.java:61)
    at com.example.coffee.MainActivity.submitOrder(MainActivity.java:42)
    at java.lang.reflect.Method.invoke(Native Method) 
    at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) 
    at android.view.View.performClick(View.java:6308) 
    at android.widget.TextView.performClick(TextView.java:11202) 
    at android.view.View$PerformClick.run(View.java:23969) 
    at android.os.Handler.handleCallback(Handler.java:751) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:154) 
    at android.app.ActivityThread.main(ActivityThread.java:6816) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)

Answer 1

输入以下语句：

    int price = Integer.parseInt(orderSummaryTextView_andPrice.getText().toString()); // price = the value of textview 2 in int form

在try-catch块中

可以进一步调查该问题。这是您尝试在代码中尝试执行的唯一数字解析，并且异常的根本原因是NumberFormatException，而您实际上正在使用

输入字符串：“”

对您的调查发表评论，我会在答案中添加建议：）

应用仅崩溃onclick，致命异常错误

1 个答案: