Android- EditText与InputFilter兑现文本对比

Android-- EditText与InputFilter实现文本对比

????? 此功能类似于临摹。已知被临摹的字符串，将字符串与EditText中输入进行

对比，输入错误，则用“×”替换所输入的字符。

import android.app.Activity;import android.os.Bundle;import android.text.InputFilter;import android.text.Spanned;import android.util.Log;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MyFilterTest extends Activity {    /** Called when the activity is first created. */TextView myText;EditText myEdit;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        final String str = "Hello,Android!";                myText=(TextView)findViewById(R.id.myText);        myText.setText(str);        myEdit=(EditText)findViewById(R.id.myEdit);                myEdit.setFilters(new InputFilter[]{ new MyInputFilter(str) });            }    public class MyInputFilter implements InputFilter{    String str=null;    public MyInputFilter(String str){    this.str=str;    }@Overridepublic CharSequence filter(CharSequence src, int start, int end,Spanned dest, int dstart, int dend) {// TODO Auto-generated method stubString ch=null;String TAG="Filter";Log.w(TAG,"src:"+src+";start:"+start+";end:"+end);Log.w(TAG,"dest:"+dest+";dstart:"+dstart+";dend:"+dend);        if(dest.length()<str.length()){        ch=str.substring(dstart+start, dstart+end);        }else{        return dest.subSequence(dstart, dend);        }                if(ch.equals(src)){                Toast.makeText(MyFilterTest.this, "match", Toast.LENGTH_SHORT).show();return dest.subSequence(dstart, dend)+src.toString();}else{Toast.makeText(MyFilterTest.this, "mismatch", Toast.LENGTH_SHORT).show();return dest.subSequence(dstart, dend)+"×";}}            }}

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