Question

I know that we can start new activity with the steps as follows :

1. Design new XML file that contains layout details ( LinearLayout,
   RelativeLayout, etc ) and add user defined widgets ( Button, TextView, … )

2. Add activiy name and label details to AndroidManifest.xml like below

   <activity android:name=".NewActivity" android:label="@string/new_activity_header" />
   

3. Define new Intent and call startActivity to start new activity.

But, i want to start new activity with start argument that will be changed in different calls.

For example :

• Main activity XML layout file:

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical" >
  
      <Button
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content"
          android:id="@+id/button" />
  </LinearLayout>
  

I want to do this :
If we press Button, new activity will be started and show the random number that generated in main activity.

Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        int rand = new Random().nextInt(10000);

        //Some code will be placed here !
    }
});

But how can i initialize new activity class field members?

Thanks in advance 🙂

Answer 1

try:

Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() 
{
    @Override
    public void onClick(View v) 
    {
        int rand = new Random().nextInt(10000);
        Intent i = new Intent(getApplicationContext(), YourClass.class);       
        i.putExtra("random", rand);
        startActivity(i);
    }
});

and in your activity:

Bundle b = new Bundle();
b = getIntent().getExtras();
int value = b.getInt("random");