设置和修改文本属性

package com.example.changefont;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class ChangeFont extends Activity {

    TextView tv;
    
   ////private int color_vals[]={R.color.start,R.color.mid,R.color.last};
    private int size_vals[]={R.dimen.small,R.dimen.medium,R.dimen.large};
  
    
    int idx=0;
    
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main1);
		tv=(TextView) findViewById(R.id.mod_text);
		
		
		Button changeFront = (Button) findViewById(R.id.change);
		changeFront.setOnClickListener(new OnClickListener() {
			
			public void onClick(View view) {
			
				// TODO Auto-generated method stub
				//tv.setTextColor(getResources().getColor(color_vals[idx]));
				
				tv.setTextSize(getResources().getDimension(size_vals[idx]));
				
				idx = (idx +1)%3;
			}
		});
		
	}

	

}

res/layout/mian1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    
    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/change_text"
        android:id="@+id/mod_text"
        android:textSize="48sp"/>
    
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_text"
        android:id="@+id/change"/>
      
    
    
    

</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">ChangeFont</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="change_text">Rainbow Connection</string>
    <string name="button_text">press to change the Front size</string>
</resources>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="start">#f00</color>
    <color name="mid">#0f0</color>
    <color name="last">#00f</color>
</resources>

dimens.xml

<resources>

    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="small">12sp</dimen>
    <dimen name="medium">24sp</dimen>
    <dimen name="large">48sp</dimen>

</resources>