弹出NumberPicker窗口，修改字体大小

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);
        }
    }

}

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.view.View;
import android.view.View.OnClickListener;
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);
		
		textView1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO 自动生成的方法存根
				
				QNumberPicker numPicker=new QNumberPicker(MainActivity.this);
				///显示数字  1111
				numPicker.setMinValue(0);
				numPicker.setMaxValue(100);
				numPicker.setValue(20);
				显示文字 222
//				final String[] city = {"北京","上海","广州","深圳","成都","天津"};  
//				numPicker.setDisplayedValues(city);  
//				numPicker.setMinValue(0);  
//				numPicker.setMaxValue(city.length - 1);  
//				numPicker.setValue(2);
	
				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();
						///显示数字  1111
						textView1.setText(newVal+"");
						
						显示文字 222
						//textView1.setText(city[newVal]+"");
					}
				});
				AlertDialog mAlertDialog = new AlertDialog.Builder(
						MainActivity.this)
						.setView(numPicker).setPositiveButton("OK", null)
						.create();
				mAlertDialog.show();
			}
		});
		
	}//onCreate
}

显示文字或数字均可以