如何检查是否创建了Intent

Question

I want to check at the beginning of my App if an Intent exists. So when I launch it some details are displayed. I can then switch to a different class to edit those details. Now if i switch back to my Main class I want the details to be replaced with the ones I just edited. I hope you guys can help me out and hopefully you understand my question.

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

     if (getIntent()!= null) {
         Intent myintent2 = getIntent();
         ArrayList<String> buffer = new ArrayList<>();
         buffer = myintent2.getStringArrayListExtra("Interest_items");
         for (int f = 0; f < buffer.size(); f++) {
             Interests.add(buffer.get(f));
         }
     } else {
         Interests.add("Cycling");
         Interests.add("Swimming");
         Interests.add ("Running");
     }
}

Answer 1

You can use a boolean .

First define a boolean as false above onCreate part

Then change its value to true in the intent body

Now you can write an if control sentence to find that the desired intent has already executed or not

Another way is correcting your code like this:

if (getIntent().getStringArrayListExtra("Interest_items"))!= null)