Passing Data & Returning Data between Activity in Android

Parent Activity where we Start to send & get Result

Steps : 1

• From the ParentActivity we are calling intents
  Intnet inent = new Intent(this, CallingActivity.class);
  
• Passing Values using "ComingFrom" as a Key Value with "Parent Activity" as Value
  
• Use startActivityForResult(intnet, requestCode) Method by passing Intent Object & any RequestCode. //

// ParentActivity.java

public class ParentActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.parent_layout);

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

            @Override
            public void onClick(View v) {

                Intent intent = new Intent(ParentActivity.this,
                        CallingActivity.class);
                int requestCode = 1;
                intent.putExtra("ComingFrom", "This is Parent Activity Data");
                startActivityForResult(intent, requestCode);
            }
        });
    }

    // find the Step 4 Below
}

Steps : 2          CallingActivity.java (getting values of Parent Activity)

• This activity called by ParentActivity.java
• Create an Intent Object and assign with getIntent() method which return Intent Object of Called Activity.
  Intnet inent = getIntent();
  
  
• Use getExtras() method get values sent by ParentActivity
  getExtras() = retrun the bundle of all extras previously added with putExtra(), or null if none have been added.
• then call the method of getString(KeyValue) method with KeyValue which created by ParentActivity.
  This method will return the value of Key.
• Display Value wherever you want.
  

Steps : 3          CallingActivity.java (sending values to Parent Activity)

• on the Button Click we have to pass the value of EditText to parent Activity
• on Click Event we Create the new Intent Object
  Intnet i = new Intent();
• same step to sending value
  i.putExtras(KeyValue, Value)
• Now as we need to send this data to called Activity we use setResult() method
  setResult(RESULT_OK, IntentObject);
  RESULT_OK = Standard activity result: operation succeeded.
• finish() the Calling Activity
  
  

// CallingActivity.java

public class CallingActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.child_layout);

        TextView resultDataTv = (TextView) findViewById(R.id.resultData);

        Intent intent = getIntent();
        String str = intent.getExtras().getString("ComingFrom");
        resultDataTv.setText(str);

        Button sendResultBtn = (Button) findViewById(R.id.sendResultBtn);
        sendResultBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                EditText et = (EditText) findViewById(R.id.dataTxt);
                String str = et.getText().toString();

                Intent i = new Intent();
                i.putExtra("childResult", str);
                setResult(RESULT_OK, i);
                finish();
            }
        });
    }
}

Steps : 4          ParentActivity.java (getting Result from Calling Activity)

• Here we have to Catch the result of Calling Activity
• First Overwrite the method onActivityResult(int requestCode, int resultCode, Intent data) in ParentActivity.java
• Check for the resultCode & requestCode (You Can use Switch as Well)
• get the result using data.getStringExtra(KeyValue) - Retrieve extended data from the intent.
• Set resulted text wherever you want.

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK && requestCode==1) {

            String str = data.getStringExtra("ComingFrom");
            TextView tv = (TextView) findViewById(R.id.resultDataFrmChild);
            tv.setText(str);
            Toast.makeText(this, str, Toast.LENGTH_SHORT)
                    .show();
        }
    }

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