界面中显示NumberPicker，修改字体大小

package com.example.numberpicker_3;



import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.NumberPicker;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.NumberPicker.OnValueChangeListener;

public class MainActivity extends Activity {

	private  QNumberPicker numPicker;
	private TextView textView1;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		textView1=(TextView)findViewById(R.id.textView1);
		numPicker=(QNumberPicker)findViewById(R.id.num_picker_1);
		numPicker.setMinValue(0);
		numPicker.setMaxValue(100);
		numPicker.setOnValueChangedListener(new OnValueChangeListener() {
			@Override
			public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
				// TODO 自动生成的方法存根
			//	Toast.makeText(MainActivity.this, "当前值是:"+newVal, Toast.LENGTH_SHORT).show();
				textView1.setText(newVal+"");
			}
		});
		
	}//onCreate
}

package com.example.numberpicker_3;

import android.content.Context;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.View;
import android.widget.EditText;
import android.widget.NumberPicker;

public class QNumberPicker extends NumberPicker {

    public QNumberPicker(Context context) {
        super(context);
    }

    public QNumberPicker(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public QNumberPicker(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void addView(View child) {
        super.addView(child);
        updateView(child);
    }

    @Override
    public void addView(View child, int index,
                        android.view.ViewGroup.LayoutParams params) {
        super.addView(child, index, params);
        updateView(child);
    }

    @Override
    public void addView(View child, android.view.ViewGroup.LayoutParams params) {
        super.addView(child, params);
        updateView(child);
    }

    public void updateView(View view) {
        if (view instanceof EditText) {
            //这里修改字体的属性
            ((EditText) view).setTextColor(Color.parseColor("#000000"));
            ((EditText) view).setTextSize(20);
        }
    }

}

亲测可用