AndroidSDK开发范例大全__Button与TextView的互交（改变字体的颜色、大小、类型）

效果图：

main.xml

package xiacl.test;

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

import android.graphics.Color;
import android.graphics.Typeface;

public class Test1Activity extends Activity {
	
	private TextView mText;
	private int[] mColors;
	private int colornum;
	
	private Button colorButton;
	private Button sizeButton;
	private Button fontButton;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mText=(TextView)findViewById(R.id.mytext);
        colorButton=(Button)findViewById(R.id.colorbutton);
        sizeButton=(Button)findViewById(R.id.sizebutton);
        fontButton=(Button)findViewById(R.id.fontbutton);
        
        mColors=new int[]{
        		Color.BLACK,Color.RED,Color.BLUE,
        		Color.GREEN,Color.MAGENTA,Color.YELLOW
        };
        colornum=0;
        
        colorButton.setOnClickListener(new Button.OnClickListener()
        {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(colornum<mColors.length)
				{
					mText.setTextColor(mColors[colornum]);
					colornum++;
				}
				else
					colornum=0;
			}       	
        });
        sizeButton.setOnClickListener(new Button.OnClickListener()
        {
        	@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				mText.setTextSize(20);
			}  
        });
        fontButton.setOnClickListener(new Button.OnClickListener()
        {
        	@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				/*必须事先在assets底下创建一fonts文件夹
				 * 并放入要使用的字体文件（.ttf）
				 * 并提供相对路径给creatFromAsset（）来创建Typeface对象*/
        		mText.setTypeface(Typeface.createFromAsset(getAssets(), "fonts/HandmadeTypewriter.ttf"));
			}  
        });
    }
}