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ArrayList Sublist Join Compare Loop Synchronize HashMap Sort Tree


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Další témata ....(Topics)


320

layout id cannot be resolved or is not a field | layout-id-cannot-be-resolved-or-is-not-a-field


1.) check your xml files in res/layout folder if contain errors or warnings, repair this
2.) try comment import R in Activity file
// import com.mysite.packagename.R;
3.) every clean and rebuild project
313

Difference between logical operators and or Java | difference-between-logical-operators-and-or-java


Basic difference remember it!!!
if(TRUE && TRUE && TRUE) return TRUE otherwise FALSE

if(FALSE || FALSE || FALSE) return FALSE otherwise TRUE

Logical operator and &&
If all conditions/operands is TRUE return TRUE, otherwise return FALSE

if( true and true and true){ 
  // return true - do something
}
int a = 6;
if(a == 6 && a == 6 ) {
 // if TRUE
 // true && true return true, do something
}

if(a == 6 && a == 5){
  // nothing, not attended
}else{
  // true && false return false, or false && false return false 
  // do something
}


Logical operator or ||
The logical OR operator (||) returns the boolean value true if either or both operands is true and returns false otherwise.
If one operands is TRUE, condition is TRUE:

if(FALSE OR FALSE OR TRUE) return TRUE
if(FALSE OR TRUE OR FALSE) return TRUE
if(FALSE OR FALSE OR FALSE) return FALSE

int a = 6;
if(a==6 || a==5){ // TRUE || FALSE return TRUE
  //if return TRUE
  //one from operadns is TRUE return true,  do something
}

if(a==5 || a==4){ // FALSE || FALSE return FALSE
 // not attended
}else{
 //if return FALSE, do something
}

rev
385

EditText.setOnKeyListener not working on maxLines EditText | edittext-setonkeylistener-not-working-on-maxlines-edittext


Check this in XML file if use singleLine
singleLine change to maxLines (1 if singleLine)
declare inputType


        android:maxLines="1"
        android:inputType="text"

342

Android Studio add library dependencies to module project | android-studio-add-library-dependencies-to-module-project



  1. File->Project Structure Ctrl + Alt + Shift + S


  2. Select module and Dependencies Tab


  3. Click on + PLUS button (right upper corner)


  4. Select library


  5. Click OK, OK





android-studio-add-library-into-project.png
85

Open url with browser if button clicked Android example. | open-url-with-browser-if-button-clicked-android-example


Button, setOnClickListener, Intent.ACTION_VIEW, startActivity Android example.


Button mIdButtonHome = (Button)findViewById(R.id.idButtonHome);
	mIdButtonHome.setOnClickListener(new View.OnClickListener() {
		public void onClick(View v) {
			Intent browserIntent = new Intent(
					Intent.ACTION_VIEW,
					Uri.parse("//android.okhelp.cz/category/software/"));
			startActivity(browserIntent);
		}
	});




Editace: 2017-02-14 10:54:48
Počet článků v kategorii: 397
Url:arraylist-sublist-join-compare-loop-synchronize-hashmap-sort-tree

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