安卓利用按钮Button更改的字体大小、字体颜色、背景颜色代码

 

www.111cn.net  编辑:future  来源:转载

本文章来介绍在android开发中，我们通过button按钮来动态改变字体大小、字体颜色、背景颜色代码，有需要了解的朋友可参考参考。

实现的逻辑：通过遍历View的方式，判断View是否是TextView、EditText和Button类型，如果是的话，就修改。

代码如下：
1、xml布局文件，文件名：test4.xml，内容如下：

代码如下

复制代码

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    android:id="@+id/mainLayout">                        android:layout_height="wrap_content"         android:orientation="horizontal">                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="30"         android:hint="请输入数字"/>                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="改变字体"/>                                     android:layout_height="wrap_content"         android:orientation="horizontal">                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="#ffffff"         android:hint="请输入字体颜色"/>                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="改变字体颜色" />                                           android:layout_height="wrap_content"         android:orientation="horizontal">                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="#ff0000"         android:hint="请输入背景颜色"/>                           android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="改变背景颜色"/>                                     android:layout_height="wrap_content"         android:orientation="vertical">                                   android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="top"                    android:gravity="top"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="bottom"                    android:gravity="bottom"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="left"                    android:gravity="left"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="right"                    android:gravity="right"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="center_vertical"                    android:gravity="center_vertical"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="fill_vertical"                    android:gravity="fill_vertical"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="center_horizontal"                    android:gravity="center_horizontal"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="fill_horizontal"                    android:gravity="fill_horizontal"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                                                                                                                                              android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="center"                    android:gravity="center"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="fill"                    android:gravity="fill"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="clip_vertical"                    android:gravity="clip_vertical"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                            android:layout_width="fill_parent"                    android:layout_height="50dp"                    android:text="clip_horizontal"                    android:gravity="clip_horizontal"                    android:textColor="#ffffff"                    android:background="#00ff00"                    android:layout_margin="2px"/>                                                                                                     < /LinearLayout>

2、实现的代码文件：MainActivity.java，代码如下：

代码如下

复制代码

package org.shuxiang.test;   import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.Window; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.TextView; public class MainActivity extends Activity{                   private LinearLayout mainLayout;         private Button changeSize, changeColor, changeBgColor;         private EditText fontSize, fontColor, bgColor;       @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         requestWindowFeature(Window.FEATURE_NO_TITLE);         setContentView(R.layout.test4);                   mainLayout = (LinearLayout) findViewById(R.id.mainLayout);         changeSize = (Button) findViewById(R.id.ChangeSize);         fontSize = (EditText) findViewById(R.id.fontSize);                   changeSize.setOnClickListener(new OnClickListener()         {                         @Override                         public void onClick(View v)                         {                                 // TODO Auto-generated method stub                                 setFontSize(mainLayout, Float.parseFloat(fontSize.getText().toString()));                         }                         });                   changeColor = (Button) findViewById(R.id.ChangeColor);         fontColor = (EditText) findViewById(R.id.fontColor);                   changeColor.setOnClickListener(new OnClickListener()         {                         @Override                         public void onClick(View v)                         {                                 // TODO Auto-generated method stub                                 int color = Integer.parseInt(fontColor.getText().toString().replace("#", ""), 16);                                 int red = (color & 0xff0000) >> 16;                              int green = (color & 0x00ff00) >> 8;                              int blue = (color & 0x0000ff);                                                            setFontColor(mainLayout, Color.rgb(red, green, blue));                                                         }                         });                   changeBgColor = (Button) findViewById(R.id.ChangeBgColor);         bgColor = (EditText) findViewById(R.id.bgColor);                   changeBgColor.setOnClickListener(new OnClickListener()         {                         @Override                         public void onClick(View v)                         {                                 // TODO Auto-generated method stub                                 int color = Integer.parseInt(bgColor.getText().toString().replace("#", ""), 16);                                 int red = (color & 0xff0000) >> 16;                              int green = (color & 0x00ff00) >> 8;                              int blue = (color & 0x0000ff);                                                               setBgColor(mainLayout, Color.rgb(red, green, blue));                         }                         });                        }           /**      * 改变字体      * @param v      * @param fontSize      */     public void setFontSize(View v, float fontSizeValue)     {             if(v instanceof TextView)                 {                         ((TextView) v).setTextSize(fontSizeValue);                 }                 else if(v instanceof EditText)                 {                         ((EditText) v).setTextSize(fontSizeValue);                 }                 else if(v instanceof Button)                 {                         ((Button) v).setTextSize(fontSizeValue);                 }                 else                 {                         int vChildCount = ((ViewGroup) v).getChildCount();                     for(int i=0; i                     {                             View v1 = ((ViewGroup) v).getChildAt(i);                             setFontSize(v1, fontSizeValue);                     }                 }             }           /**      * 改变字体颜色      * @param v      * @param fontSize      */     public void setFontColor(View v, int fontColorValue)     {             if(v instanceof TextView)                 {                         ((TextView) v).setTextColor(fontColorValue);                 }                 else if(v instanceof EditText)                 {                         ((EditText) v).setTextColor(fontColorValue);                 }                 else if(v instanceof Button)                 {                         ((Button) v).setTextColor(fontColorValue);                 }                 else                 {                         int vChildCount = ((ViewGroup) v).getChildCount();                     for(int i=0; i                     {                             View v1 = ((ViewGroup) v).getChildAt(i);                             setFontColor(v1, fontColorValue);                     }                 }             }           /**      * 改变背景字体      * @param v      * @param fontSize      */     public void setBgColor(View v, int bgColorValue)     {             if(v instanceof TextView)                 {                         ((TextView) v).setBackgroundColor(bgColorValue);                 }                 else if(v instanceof EditText)                 {                         ((EditText) v).setBackgroundColor(bgColorValue);                 }                 else if(v instanceof Button)                 {                         ((Button) v).setBackgroundColor(bgColorValue);                 }                 else                 {                         int vChildCount = ((ViewGroup) v).getChildCount();                     for(int i=0; i                     {                             View v1 = ((ViewGroup) v).getChildAt(i);                             setBgColor(v1, bgColorValue);                     }                 }             }       }