EditText实现输入限制和校验功能实例代码

android:digits="abc"

android:inputType="number"

String s=et_verify_empty.getText().toString();
 if(s==null||s.length()==0){
　　et_verify_empty.setError("不能为空");
 }

package fry;
import com.example.editTextDemo1.R;
import android.app.Activity;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.ImageSpan;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class ActivityDemo2 extends Activity implements OnClickListener{
  private EditText et_verify_empty;
  private Button btn_verify;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity02);
    setTitle("EditText实现输入限制和校验");
    et_verify_empty=(EditText) findViewById(R.id.et_verify_empty);
    btn_verify=(Button) findViewById(R.id.btn_verify);
    btn_verify.setOnClickListener(this);
  }
  @Override
  public void onClick(View arg0) {
    // TODO Auto-generated method stub
    String s=et_verify_empty.getText().toString();
    //if(s==null||s.length()==0){
    if(TextUtils.isEmpty(s)){
      et_verify_empty.setError("不能为空");
    }
  }
}

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>