利用SpannableString和ImageSpan在textview中插入图片的方法

<?xml version="1.0" encoding="utf-8"? 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical"  
  <easy.stu.MyTextView
    android:id="@+id/mytext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" / 
  <Button
    android:id="@+id/myButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="insert" / 
</LinearLayout 

package easy.stu;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ImageSpan;
import android.util.AttributeSet;
import android.widget.EditText;
public class MyTextView extends TextView {
  public MyTextView(Context context) {
    super(context);
  }
  public MyTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  public void insertDrawable(int id) {
    final SpannableString ss = new SpannableString("easy");
    //得到drawable对象，即所要插入的图片
    Drawable d = getResources().getDrawable(id);
    d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
    //用这个drawable对象代替字符串easy
    ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
    //包括0但是不包括"easy".length()即：4。[0,4)。值得注意的是当我们复制这个图片的时候，实际是复制了"easy"这个字符串。
    ss.setSpan(span, 0, "easy".length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
    append(ss);
  }
}

package easy.stu;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MyActivity extends Activity {
  /** Called when the activity is first created. */
  Button b;
  MyEditText e;
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    b = (Button) findViewById(R.id.myButton);
    e = (MytextView) findViewById(R.id.mytext);
    b.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        e.insertDrawable(R.drawable.easy);
      }
    });
  }
}