Android Studio defaultValue/ passing Variables [duplicate]

Question

I'm new to Android Studio and java, so hopefully you can help me. I want to pass a double variable from on activity to the next. But I'm unsure what needs so go in the defaultValue in the receiving activity.

Here is the code from activity one:

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button weiter = (Button)findViewById(R.id.weiter); weiter.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { EditText EingabeBreite = (EditText)findViewById(R.id.breite); double breite = Double.parseDouble(EingabeBreite.getText().toString()); Intent rüber = new Intent(getApplicationContext(), Main2Activity.class); getIntent().putExtra("next", breite); startActivity(rüber);

Here is the code from the second activity:

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); TextView ergebnis = (TextView)findViewById(R.id.textView2); Bundle extras = getIntent().getExtras(); double breite = extras.getDouble("next"); ergebnis.setText(Double.toString(breite));

What happens when you run your app? Does it have any errors? If so, what are they? If not, how does the behavior differ from what you want? — Code-Apprentice
– Code-Apprentice, Commented Sep 8, 2018 at 5:03

ʍѳђઽ૯ท · Accepted Answer · 2018-09-07 18:54:14Z

 Intent weiter = new Intent(MainActivity.this,Main2Activity.class); startActivity(weiter); EditText EingabeBreite = (EditText)findViewById(R.id.breite); double breite = Double.parseDouble(EingabeBreite.getText().toString()); Intent rüber = new Intent(getApplicationContext(),MainActivity.class); getIntent().putExtra("next","breite"); startActivity(rüber);

First off- you're starting 2 intents. That's not what you want. Only one activity can be in the forefront, you want to do one of these. Not both.

Secondly- you don't want getIntent().putExtra(). You want ruber.putExtra(). You need to put the extra on the intent you send to the other activity. Calling getIntent will get the intent that started the current Activity, which isn't what you're sending to the next one.

sajad zohrei · Accepted Answer · 2018-09-08 05:00:37Z

add the code to second activity:

 double breite=getIntent().getDoubleExtra("next",0d);

So easy

hedi boughanmi · Accepted Answer · 2018-09-07 18:56:26Z

use this code :

 Intent mIntent = new Intent(HomeActivity.this, CenterActivity.class); mIntent.putExtra("thevalue ", 0.0d); startActivity(mIntent); Intent intent = getIntent(); double d = Double.parseDouble(intent.getExtras().getString("thevalue "));

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