Example Application: Call Activity | Start Another Activity - Android
Simple start another activity
Structure for startActivity:
Intent i = new Intent(MainActivity.this, SecondActivity.class); startActivity(i);
Initialize another activity with parameters Using different types of parameters
- String;
- Integer;
- Long;
- Boolean;
- Drawable;
- Model (Class Person)
Structure for startActivity with putExtras:
Intent i = new Intent(MainActivity.this, SecondActivity.class); i.putExtra(getString("KEY", "StringValueExtra"); startActivity(i);
Example
Intent i = new Intent(MainActivity.this, SecondActivity.class); i.putExtra(getString(R.string.EXTRA_STRING), "StringValueExtra"); i.putExtra(getString(R.string.EXTRA_INT), 1); i.putExtra(getString(R.string.EXTRA_LONG), 1L); i.putExtra(getString(R.string.EXTRA_BOOLEAN), true); i.putExtra(getString(R.string.EXTRA_DRAWABLE), R.drawable.ic_android); i.putExtra(getString(R.string.EXTRA_MODEL), new Person("NamePerson", "AnyPersonValue")); startActivity(i);
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How to create model? How to do the Getters and Setters?
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How to declare variables?
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See strings.xml
In the second activity:
Intent i = getIntent(); Bundle extras = i.getExtras();
Check has extras (PutExtras)
if (extras == null) { //TODO }
Check contains key PutExtra
if (extras.containsKey("KEY"){ //TODO }
Example
if (extras != null) { if (extras.containsKey("KEY"){ //TODO } }
Declare variable for request code.
int CODE_ANY = 100; // ANY VALUE;
Intent i = new Intent(MainActivity.this, SecondActivity.class); startActivityForResult(i, CODE_ANY));
In the second activity
Intent i = new Intent(); i.putExtra("KEY", "THIS VALUE RETURN ACTIVITY FOR RESULT"); setResult(RESULT_OK); finish();
@Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { if( requestCode == CODE_ANY)) { if (resultCode == RESULT_OK) { if(data != null){ if(data.getExtras().containsKey("KEY")){ // TODO - has extra } } } }
