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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;
}
@Override
public CharSequence filter(CharSequence src, int start, int end,
Spanned dest, int dstart, int dend) {
// TODO Auto-generated method stub
String 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)+"×";
}
}
}
}
MyFilterTest.rar (852 Bytes)
最后更新：2017-04-04 07:03:42