[Android]IntentでEditTextの値を画面間で渡せない時にチェックすること

public class ChildActivity extends Activity {
 
    EditText edtMessage;
 
    ...中略...
 
    /* OKボタンがクリックされた時のリスナ */
    private class BtnOkClickListener implements OnClickListener {
        @Override
        public void onClick(View v) {
 
            Intent it = getIntent();
            it.putExtra( "Key_Message", edtMessage.getText() );
            setResult( RESULT_OK, it );
 
            finish();
        }
    }    
}

public class ChildActivity extends Activity { EditText edtMessage; ...中略... /* OKボタンがクリックされた時のリスナ */ private class BtnOkClickListener implements OnClickListener { @Override public void onClick(View v) { Intent it = getIntent(); it.putExtra( "Key_Message", edtMessage.getText() ); setResult( RESULT_OK, it ); finish(); } } }

public class ParentActivity extends Activity {
 
    /** ボタンクリック時のハンドラ(子画面に遷移)
     */
    private class BtnAddAlermClickListener implements OnClickListener {
        public void onClick(View v) {
            Intent it = new Intent( getApplicationContext(), ChildActivity.class );
            startActivityForResult( it, REQ_INPUT_MSG );
        }
    }
 
    /** 子画面から戻ってきた時のハンドラ
     */
    @Override
    public void onActivityResult( int reqCode, int result, Intent it ) {
        if ( reqCode == REQ_INPUT_MSG && result == RESULT_OK ) {
            String msg = it.getStringExtra( "Key_Message" );
            txtMessage.setText( msg );
        }
    }
}

public class ParentActivity extends Activity { /** ボタンクリック時のハンドラ(子画面に遷移) */ private class BtnAddAlermClickListener implements OnClickListener { public void onClick(View v) { Intent it = new Intent( getApplicationContext(), ChildActivity.class ); startActivityForResult( it, REQ_INPUT_MSG ); } } /** 子画面から戻ってきた時のハンドラ */ @Override public void onActivityResult( int reqCode, int result, Intent it ) { if ( reqCode == REQ_INPUT_MSG && result == RESULT_OK ) { String msg = it.getStringExtra( "Key_Message" ); txtMessage.setText( msg ); } } }

public void onClick(View v) {
 
    Intent it = getIntent();
    it.putExtra( "Key_Message", edtMessage.getText().tostring() );
    setResult( RESULT_OK, it );
 
    finish();
}

public void onClick(View v) { Intent it = getIntent(); it.putExtra( "Key_Message", edtMessage.getText().tostring() ); setResult( RESULT_OK, it ); finish(); }