Passing data to previous activity

We will pass data back to MainActivity.

In class Second, we want to pass a string to MainActivity.

In MainActivity, change code in button Next to open class second to like this.

Intent in=new Intent(getBaseContext(),second.class);

Bundle bun = new Bundle();

bun.putString("text",a );

bun.putInt("num", number);

bun.putStringArray("gi", fru);

in.putExtras(bun);     

startActivityForResult(in, 1);

We use startActivityForResult to wait for something pass back .

Copy to above last bracket.

@Override

     protected void onActivityResult(int requestCode, int resultCode, Intent data) {       

       if (requestCode == 1) {

        if(resultCode == 3){                                                   Bundle bun = data.getExtras();

          String back = bun.getString("iz");

           tv.setText(back);                                             }              

         } else if (resultCode == RESULT_CANCELED) {

             // Handle cancel

         }

 }

In this Override command, we receive string and set to a textView. Take notice to resultCode == 3.

In class second, copy in to Back button, above finish().

String back=”This is string send back”;

Intent in = getIntent();

Bundle bun = new Bundle();

bun.putString("iz", back);

in.putExtras(bun);

setResult(3, in);

Take notice to setResult(3, in);

It must be the same with number in resultCode in class MainActivity.

Keyword “iz” the same too.

Save and run to see result.