<EditText android:id="@+id/edittext" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:inputType="text"> </EditText> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/edittext" android:layout_alignRight="@+id/edittext" android:layout_below="@+id/edittext" android:layout_marginTop="38dp" android:text="添加QQ表情" />
MainActivity.java
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;@Overrideprotected 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() {@Overridepublic 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) {}}});}@Overridepublic 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;}}
