How to use StringUtils and myString, getting cannot resolve error

问题

Running the below code and can't resolve StringUtils and myString... does something need imported or is there another way? this takes a string from another activity and makes it an integer to allow a calculation of old and new values.

   protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // Setting button as a unique name
            Button buttonAdd = (Button) findViewById(R.id.add_button);
            Button buttonAbout = (Button) findViewById(R.id.about_button);
            Button buttonReset = (Button) findViewById(R.id.reset_button);


            String calorie = getIntent().getStringExtra("calorie");
            TextView textView1 = (TextView)findViewById(R.id.textView1);

            String strOldValue = textView1.getText().toString();

            Integer oldValue = StringUtils.isNotBlank(myString) ? Integer.parseInt(myString) : 0;
            Integer newValue = Integer.parseInt(calorie);



            textView1.setText((oldValue + newValue));

回答1:

The most of safe way is used to try {} catch {} block like code below

Integer oldValue;
try{
 oldValue= Integer.parseInt(myString);
}catch(NumberFormatException e){
  oldValue =0;
}

instead of :

 Integer oldValue = StringUtils.isNotBlank(myString) ? Integer.parseInt(myString) : 0;

回答2:

To add to Konrad's answer:

You should include all your code...

if you are trying to Get a String from a previous Activity then parse it to an Integer, Why not just pass it as an int And do something like:

Declare class level variable

private int mPassedInValue;

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

 // Get the Extras Bundle from the Intent
 Bundle previousIntentExtras  = getIntent().getExtras();

 // Check to make sure this is not null
 if(previousIntentExtras != null){
    mPassedInValue = previousIntentExtras.getInt("MyInt",0);

  /* ... Perform the function you want to do since the value you passed in is
   * Is already in the correct form...
   */ 

 }

}

来源：https://stackoverflow.com/questions/28726962/how-to-use-stringutils-and-mystring-getting-cannot-resolve-error

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