如何在Android中的if循环中检查数组？

Question

I have problem with if loop in array.I am working in Ginger bread source code and modify email app but problem in if loop in array.Show my code.

String[] arrayUri;
    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
    setContentView(R.layout.message_compose);
    //getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.list_title);
    Bundle b=this.getIntent().getExtras();
    arrayUri=b.getStringArray("uriList");
    //data1=getIntent().getExtras().getString("hello");
    mController = Controller.getInstance(getApplication());
    mListener = new Listener();
    initViews();
    if(arrayUri != null) //Not Working
    {
      makeToast("Hello");
    }

I used this one

    if(!arrayUri.equals("")) //Not Working
    {
      makeToast("Hello");
    }


    if(arrayUri.length >0) //Not Working
    {
      makeToast("Hello");
    }

    if(arrayUri.length != 0) //Not Working
    {
      makeToast("Hello");
    }

Over all condition are not working in email app. any other way to compare array in if.

Answer 1

I haven't tested this (I'm 80% certain it'll work)

But it should get you on the path to an answer.

if (arrayUri.getClass().isArray()) {
  // I'm an array
} else {
  // I'm not an array
}

Answer 2

Use

if(arrayUri == null || arrayUri.length == 0){
   toast("ARRAY EMPTY OR NULL");
} else {
   toast("Hello");
}

Answer 3

Convert your array into arrayList. It might help you. You can try this.

ArrayList<String> lst;

     for(int i = 0; i < arrayUri.length; i++ )
     {
         lst.add(arrayUri[i]);
     }

if(lst.isEmpty())
     {

     }

Hope this will help you...