import android.support.design.widget.TextInputEditText;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    TextInputEditText inputText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        inputText = (TextInputEditText)findViewById(R.id.editText);

        inputText.setFocusable(false); // when user types, it directly opens an alertdialog
        inputText.setInputType(InputType.TYPE_NULL); // don't show soft keyboard, shows an alertdialog instead
        inputText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // shows an alertdialog
                showDialog();
            }
        });
    }//onCreate

   private void showDialog(){
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
        dialogBuilder.setTitle("Info");
        dialogBuilder.setMessage("Some informative message for the user.");
        dialogBuilder.setPositiveButton("Done", (dialog, which) -> dialog.dismiss());
        dialogBuilder.create().show();
    }//showDialog

}//MainActivity