Binding buttons to layout via intent?

Question

Question newcomer to android. I started to study intents: I want to attach 3 buttons to 3 layout, so that in the second activit we could see which button was pressed and the corresponding layout was called. So generally do? And how to do it correctly through intent?

Activity_1.java:

public void onClick(View v){ switch (v.getId()){ case R.id.button_1: { Intent intent = new Intent (getApplicationContext(),Activity_2.class); intent.putExtra("key","b1"); startActivity(intent); break; } case R.id.button_2: { Intent intent = new Intent (getApplicationContext(),Activity_2.class); intent.putExtra("key","b2"); startActivity(intent); break; } case R.id.button_3: { Intent intent = new Intent (getApplicationContext(),Activity_2.class); intent.putExtra("key","b3"); startActivity(intent); break; }

Activity_2.java:

 @Override protected void onCreate (Bundle savedInstanceState) { super.onCreate (savedInstanceState); String data = getIntent().getStringExtra("key"); if (data == "b1") setContentView (R.layout.activity_number1); else if (data == "b2") setContentView (R.layout.activity_number2); else setContentView (R.layout.activity_number3); }

Before continuing, you should read this answer and think well again
I understand correctly that such a solution is not used in actual practice?
if a lot of layout, it is better to implement through fragments?
You can try, but very soon you will understand that it is not just not used, but absolutely not working, if you are planning to interact with the interface.
In this particular case, will it be correct to create 3 Activities for each markup?
If each screen displays different widgets (different screen layouts), then yes: 3 activations or 1 activations with 3 fragments

Ivan Ivan 109 one eight · Answer 1 · 2018-03-02T10:58:17

In general, everything is correct. But you can simplify the code.

Add a static start(String key) method to Activity_2.java . It starts Activity_2 with the key addition (writes the key string argument to the intent).

 public static void start(Context context, String key) { Intent starter = new Intent(context, Activity_2.class); starter.putExtra("KEY", key); context.startActivity(starter); }

And in Activity_1.java will look like this:

 public void onClick(View v){ switch (v.getId()){ case R.id.button_1: { Activity_2.start(Activity_1.this, "b1"); break; } case R.id.button_2: { Activity_2.start(Activity_1.this, "b2"); break; } case R.id.button_3: { Activity_2.start(Activity_1.this, "b3"); break; }

I can not understand why it is called only (R.layout.activity_number3)?

Binding buttons to layout via intent?

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