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 ; } } |