<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <EditText    android:id="@+id/mobile"    android:layout_width="190dp"    android:layout_height="wrap_content"    android:text="手機號碼" />  <EditText    android:id="@+id/address"    android:layout_width="190dp"    android:layout_height="wrap_content"    android:text="地址" /></LinearLayout>

package com.example.whaletosea.application04;import android.os.Bundle;import android.app.Activity;import android.view.View;import android.widget.EditText;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.Toast;public class MainActivity extends Activity {  //聲明 EditText  private EditText etMobile=null;  private EditText etAddress=null;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //獲取EditText    etMobile = (EditText) super.findViewById(R.id.mobile);    etAddress = (EditText) super.findViewById(R.id.address);    //注冊OnClick OnFocusChange監聽器    etMobile.setOnClickListener(new MobileOnClickListener());    etMobile.setOnFocusChangeListener(new MobileOnFocusChanageListener());    etAddress.setOnClickListener(new AddressOnClickListener());    etAddress.setOnFocusChangeListener(new AddressOnFocusChanageListener());  }  //MobileOnClickListener單擊監聽器   private class MobileOnClickListener implements OnClickListener{    @Override    public void onClick(View view ){      etMobile.setText("");    }  }  //MobileOnFocusChanageListener焦點監聽器  private class MobileOnFocusChanageListener implements OnFocusChangeListener{    @Override    public void onFocusChange(View view ,boolean hasFocus){      if(view.getId()==etMobile.getId())        Toast.makeText(getApplicationContext(),"手機文本框獲得焦點！",Toast.LENGTH_LONG).show();    }  }  //AddressOnClickListener單擊監聽器  private class AddressOnClickListener implements OnClickListener{    @Override    public void onClick(View view){      etAddress.setText("");    }  }  //MobileOnFocusChanageListener焦點監聽器  private class AddressOnFocusChanageListener implements OnFocusChangeListener{    @Override    public void onFocusChange(View view,boolean hasFocus){      if(view.getId()==etAddress.getId())        Toast.makeText(getApplicationContext(), "地址文本框獲得焦點！",Toast.LENGTH_LONG).show();    }}