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Webtechnologien

show a new activity

Sequence

create the first activity

create an onClick-Event (button)

create the second activity (new activity)

create a new Intent-object

start the new activity

optional you receive a resultcode




1. Sample


1. Activity, onClick-Event

public void bn1_click(View view) { Toast.makeText(this, "bn1_click", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(this,SecondActivity.class); startActivity(intent); }

2. new Activity with params

First Activity, onClick-Event public void bn1_click(View view) { String param1 = "param1"; int param2 = 42; Toast.makeText(this, "bn1_click", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(this,SecondActivity.class); // set the params for the 2. activity intent.putExtra("PARAM1", param1); // Hash value // only String can set as a parameter !!!!!!!!!! intent.putExtra("PARAM2", Integer.toString(param2)); // Hash value startActivity(intent); } Second Activity, get the params protected void onCreate(Bundle savedInstanceState) { String message = intent.getStringExtra("param1"); edittext_param1.setText(message); message = intent.getStringExtra("param2"); int param2=-1; try { param2 = Integer.parseInt(message); } catch (NumberFormatException e) { Toast.makeText(this, "NumberFormatException: param2", Toast.LENGTH_SHORT).show(); param2 = -1; } spinner_param2.setSelection(param2); } public void bnFinish_click(View view) { finish(); }


2. Sample, with resultcode


new Activity with params and result code

First Activity, onClick-Event public void bn1_click(View view) { String param1 = "param1"; int param2 = 42; Toast.makeText(this, "bn1_click", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(this,SecondActivity.class); // set the params for the 2. activity intent.putExtra("PARAM1", param1); // Hash value // only String can set as a parameter !!!!!!!!!! intent.putExtra("PARAM2", Integer.toString(param2)); // Hash value startActivity(intent); } // This method get the resultcode or the requestCode // in the "RESULT_OK" section you must insert yout code @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 1) { if(resultCode == Activity.RESULT_OK){ // start the action Toast.makeText(this, "start the action", Toast.LENGTH_LONG).show(); } if (resultCode == Activity.RESULT_CANCELED) { //Write your code if there's no result } } // if } //onActivityResult Second Activity, get the params protected void onCreate(Bundle savedInstanceState) { String str_param1 = intent.getStringExtra("param1"); edittext_param1.setText(str_param1); int int_param2 = intent.getIntExtra("param2"); spinner_param2.setSelection(int_param2); } public void bnFinish_click(View view) { Intent returnIntent = new Intent(); setResult(Activity.RESULT_CANCELED, returnIntent); finish(); } public void bnFinish_click(View view) { Intent returnIntent = new Intent(); // set a param for the main activity returnIntent.putExtra("result", "1111"); setResult(Activity.RESULT_OK, returnIntent); finish(); }

Spinner
TableLayout