给EditText中的图片加监听

package com.example.helloword;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.text.Editable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.ImageSpan;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
	EditText txtEdit;
	ImageSpan imageSpan;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		txtEdit = (EditText) findViewById(R.id.et_button);
		txtEdit.setOnClickListener(textListener);

		imageSpan = new ImageSpan(this, R.drawable.ic_launcher);
		SpannableString ss = new SpannableString("photo");
		ss.setSpan(imageSpan, 0, "photo".length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
		Editable editable = txtEdit.getEditableText();
		int selectedIndex = txtEdit.getSelectionStart();
		ss.getSpans(0, ss.length(), ImageSpan.class);
		if (selectedIndex < 0)
		 editable.append(ss);
		else
		 editable.insert(selectedIndex, ss);
	}

	private OnClickListener textListener = new OnClickListener()
	 {
	  @Override
	  public void onClick(View v)
	  {   //关闭软键盘
		   InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
		   imm.hideSoftInputFromWindow(txtEdit.getWindowToken(), 0);
		   Spanned s = txtEdit.getText();
		   ImageSpan[] imageSpans = s.getSpans(0, s.length(), ImageSpan.class);
		   int selectionStart = txtEdit.getSelectionStart();
		   for (ImageSpan span : imageSpans)
		   {
		    int start = s.getSpanStart(span);
		    int end = s.getSpanEnd(span);
		    if (selectionStart >= start && selectionStart < end)//找到图片
		    {
		     Bitmap bitmap = ((BitmapDrawable) span.getDrawable()).getBitmap();
		     viewPicture(bitmap);
		     return;
		    }
		   }
		 //打开软键盘
		   imm.showSoftInput(txtEdit, 0);
	  }
	 };

	 private void viewPicture(Bitmap bitmap)
	 {
		 System.out.println("*******************************");
	 /* if (bitmap == null)
	   return;
	//将由图片生成Uri
	  Uri uri = Uri.parse(MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, null, null));
	  Intent intent = new Intent(Intent.ACTION_VIEW);
	  intent.setDataAndType(uri, "image/*");
	  startActivity(intent);  */
	 }
}