Use Intent To pick system contact data

Call android to pop out an list for user to pick up a system contact data.
startActivityForResult(new Intent(Intent.ACTION_PICK, 
 android.provider.ContactsContract.Contacts.CONTENT_URI),user-defined);


System may do the following process.
Button pickButton=(Button)findViewById(R.id.pick_button);
pickButton.setOnclickListener(new View.OnClickListener(){
　　public void onClick(View view){
                //Store the URI of the selected item
　　　　Uri data=Uri.parse(“content://horses/”+ selected_id);
　　　　Intent result=new Intent(null,data);
　　　　result.putExtra(IS_INPUT_CORRECT,inputCorrect);
　　　　result.putExtra(SELECTED_PISTOL,selectedPistol);
　　　　setResult(RESULT_OK,result);
　　　　finish();
　　}
});


Return the result to activity
protected void onActivityResult (int requestCode, int resultCode, Intent data) 
{
              //Abstract data from intent
             Uri uriRet = data.getData()
             boolean inputCorrect=data.getBooleanExtra( IS_INPUT_CORRECT,false);
    String selectedPistol=data.getStringExtra( SELECTED_PISTOL);
}