Android笔记:TextView和编辑框中添加图片,ImageSpan,SpannableStringBuilder用法

在TextView或者编辑框EditText中添加图片的方法，代码如下:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.os.Bundle;
import android.app.Activity;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ImageSpan;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity
{
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        TextView tv = (TextView) findViewById(R.id.tv);
        String str = "sdfasd★fasljeojg★fad falsdkjf★asjdkf alsdj★foawpjf sajfadsjf ladjfa ls";
        
        SpannableStringBuilder builder = new SpannableStringBuilder(str); 
        String flag = "★";
        Pattern pattern = Pattern.compile(flag);
        Matcher matcher = pattern.matcher(str);
        while (matcher.find())
        {
            builder.setSpan(new ImageSpan(this, R.drawable.ic_launcher), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            
        }
        tv.setText(builder);
        
        
        EditText ed = (EditText) findViewById(R.id.editText1);
        ed.setText(builder);
        
    }
}

布局文件代码如下:

<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" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tv"
        android:layout_marginTop="63dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

</RelativeLayout>

效果图：