如何根据第一活动数据（单击单选按钮）从第二活动转到第三活动或第四活动？

Question

I have four activities say java files - activity1.java, activity2.java, activity3.java, activity4.java and xml files - activity_1.xml, activity_2.xml, activity_3.xml, activity_4.xml

Now in activity1 - I have a radio group with two radio buttons and a button to go to activity2

Now in activity2 - I have a button to go to activity3 or activity4 based on which radio button is clicked in activity1.

I can delete activity2 and use if condition in activity1 to go to activity3 or 4 But I definitely need activity2

I am not familiar with bundles, shared preferences

How? Any help in this regard

Answer 1

You can just use an intent and pass on values between activities. In first activity:

 Intent intent = new Intent(this, SecondActivity.class);
 intent.putExtra("someName", valueOfRadioButton);
 startActivity(intent);

In the onCreate of the next activity you can retrieve the value you passed like this (for an Integer):

 getIntent().getIntExtra("someName", someDefaultValue);

Now you have a variable to query. Depending on the value, you launch whatever activity you like.

Answer 2

Use

Intent startSecondActivityIntent = new Intent(FirstActivity.this,SecondActivity.java);
Intent.putExtra("nameOfValue",value);
startActivity(startSecondActivityIntent);

Then you can get this value:

getIntent().getIntExtra("nameOfValue",defaultValue);

Or you can use SharedPreferences

SharedPreferences sp = getSharedPreferences("nameOfPreferences",MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();
    editor.putString("nameOfValue",value);
    editor.commit();

And get this value in other activity:

SharedPreferences sp = getSharedPreferences("nameOfPreferences",MODE_PRIVATE);
String value = sp.getString("nameOfValue",defaultValue);