Android下Button实现图文混排效果

package fry;import com.example.buttonDemo1.R;import android.app.Activity;import android.graphics.BitmapFactory;import android.os.Bundle;import android.text.Spannable;import android.text.SpannableString;import android.text.style.ImageSpan;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.view.View.OnTouchListener;import android.widget.Button;public class Activity02 extends Activity {  private Button btn_big;  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.activity02);    btn_big=(Button) findViewById(R.id.btn_big);        //SpannableString的ImageSpan添加左边图片    SpannableString spannableString1=new SpannableString("left");    ImageSpan imageSpan=new ImageSpan(this, BitmapFactory.decodeResource(getResources(), R.drawable.image_left));    spannableString1.setSpan(imageSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        //SpannableString的ImageSpan添加右边图片    SpannableString spannableString2=new SpannableString("right");    ImageSpan imageSpan2=new ImageSpan(this, BitmapFactory.decodeResource(getResources(), R.drawable.image_right));    spannableString2.setSpan(imageSpan2, 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);        btn_big.append(spannableString1);    btn_big.append("我的按钮");    btn_big.append(spannableString2);  }}