2 ways to add Prefix and Postfix in Android Edittext For Android

2 ways to add Prefix and Postfix in Android Edittext For Android

There is basically two way of adding Prefix and Postfix in Android EditTextView.

• added text change listener to edittext
• create custom edittext

One way,

final EditText edt = (EditText) findViewById(R.id.editText1);

edt.setText("http://");
Selection.setSelection(edt.getText(), edt.getText().length());


edt.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            if(!s.toString().startsWith("http://")){
                edt.setText("http://");
                Selection.setSelection(edt.getText(), edt.getText().length());

            }

        }
    });

Another way

import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.EditText;

/**
 * Custom EditText that displays a fixed prefix in line with the text.

* The trick here is to draw the prefix as a drawable and attach it via
 * setCompoundDrawables().
 */
public class PrefixedEditText extends EditText {
    private ColorStateList mPrefixTextColor;
    public PrefixedEditText(Context context) {
        this(context, null);
    }
    public PrefixedEditText(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.editTextStyle);
    }
    public PrefixedEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mPrefixTextColor = getTextColors();
    }
    public void setPrefix(String prefix) {
        setCompoundDrawables(new TextDrawable(prefix), null, null, null);
    }
    
    public void setPrefixTextColor(int color) {
        mPrefixTextColor = ColorStateList.valueOf(color);
    }
    
    public void setPrefixTextColor(ColorStateList color) {
        mPrefixTextColor = color;
    }
    private class TextDrawable extends Drawable {
        private String mText = "";
        public TextDrawable(String text) {
            mText = text;
            setBounds(0, 0, (int) getPaint().measureText(mText) + 2, (int) getTextSize());
        }
        @Override
        public void draw(Canvas canvas) {
            Paint paint = getPaint();
            paint.setColor(mPrefixTextColor.getColorForState(getDrawableState(), 0));
            int lineBaseline = getLineBounds(0, null);
            canvas.drawText(mText, 0, canvas.getClipBounds().top + lineBaseline, paint);
        }
        @Override
        public void setAlpha(int alpha) {/* Not supported */}
        @Override
        public void setColorFilter(ColorFilter colorFilter) {/* Not supported */}
        @Override
        public int getOpacity() {
            return 1;
        }
    }
}