android_常用UI控件_02_EditText_01添加图片到edittext中

MainActivity.java

package com.example.android_editext_1face;

import java.lang.reflect.Field;
import java.util.Random;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText edittext;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edittext = (EditText) this.findViewById(R.id.edittext);
        button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                int randomId = 1 + new Random().nextInt(1);
                try {
                    Toast.makeText(MainActivity.this, "Hello", 0);
                    Field f = R.drawable.class.getDeclaredField("face"
                            + randomId);
                    int resourceId = Integer.parseInt(f.get(null).toString());
                    // 在android中要想显示图片信息，必须使得Bitmap的对象来装载
                    Bitmap bitmap = BitmapFactory.decodeResource(
                            getResources(), resourceId);
                    // ImageSpan
                    ImageSpan p_w_picpathspan = new ImageSpan(MainActivity.this,
                            bitmap);
                    SpannableString spannablestring = new SpannableString(
                            "face");
                    spannablestring.setSpan(p_w_picpathspan, 0, 4,
                            Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                    // 添加内容到edittext中
                    edittext.append(spannablestring);
                } catch (Exception e) {
                    // TODO: handle exception
                }
            }
        });
    }

    @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;
    }

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

   <EditText 
       android:id="@+id/edittext"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_marginTop="10dp"
       />
   <Button 
       android:id="@+id/button"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="添加qq表情"
       android:layout_marginTop="50dp"
       />

</RelativeLayout>