Android编程开发之EditText实现输入QQ表情图像的方法

package com.example.edittext1;
import java.lang.reflect.Field;
import java.util.Random;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ImageSpan;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
 //声明控件对象
 private EditText editText;
 private Button button;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  editText=(EditText) findViewById(R.id.edittext);
  button=(Button) findViewById(R.id.button1);
  //为按钮注册点击事件
  button.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    //产生随机数 随机数是从0开始，所以要加1，这样就会产生1到9的随机数
    int randomId=1+new Random().nextInt(9);
    try {
     //获取表情图片文件名
     Field field=R.drawable.class.getDeclaredField("face"+randomId);
     int resourceId = Integer.parseInt(field.get(null).toString());
     // 在android中要显示图片信息，必须使用Bitmap位图的对象来装载
     Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
     //要让图片替代指定的文字就要用ImageSpan
     ImageSpan imageSpan = new ImageSpan(MainActivity.this, bitmap);
     SpannableString spannableString = new SpannableString("face");//face就是图片的前缀名
     spannableString.setSpan(imageSpan, 0, 4,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
     editText.append(spannableString);
    } catch ( Exception e) {
    }
   }
  });
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
}