android 焦点事件

package org.focus.cn; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnFocusChangeListener; import android.widget.EditText; import android.widget.TextView; /** * 2012-03-15 * @author song * QQ:876245986 */ public class FocusActivity extends Activity { private EditText edit,edit2; private TextView text; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.edit = (EditText) super.findViewById(R.id.edit); this.edit2= (EditText) super.findViewById(R.id.edit2); this.text = (TextView) super.findViewById(R.id.txt); this.edit.setOnFocusChangeListener(new OnFocusChangeListenerimp()); this.edit.setOnClickListener(new OnClickListenerimp()); } private class OnClickListenerimp implements OnClickListener{ @Override public void onClick(View v) { FocusActivity.this.edit.setText(""); //清空数据 } } //焦点事件 private class OnFocusChangeListenerimp implements OnFocusChangeListener{ @Override public void onFocusChange(View v, boolean hasFocus) { //hasFocus表示是否获得焦点 if(hasFocus) { FocusActivity.this.text.setText("获得焦点！"); }else{ if(FocusActivity.this.text.length()>1) { FocusActivity.this.text.setText("文本输入组件，失去焦点，数据合法。"); }else{ FocusActivity.this.text.setText("文本输入组件，失去焦点,请输入数据！"); } } } } }