xml文件

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    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">


            android:textSize="10dp"

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="为了防止用户信息被盗用，请使用本机号码登录"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

            android:gravity="left|center"
        android:textSize="15dp"
        android:hint="请输入手机号"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:inputType="phone"
        android:ems="11"
        android:id="@+id/editText"
        android:layout_below="@+id/textView"
        android:layout_marginTop="60dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_toRightOf="@+id/p_w_picpathView"
        android:layout_toEndOf="@+id/p_w_picpathView" />

            android:scaleType="fitCenter"
        android:adjustViewBounds="false"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:id="@+id/p_w_picpathView"
        android:src="@drawable/password"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignBottom="@+id/editText" />

            android:gravity="left|center"
        android:textSize="15dp"
        android:adjustViewBounds="false"
        android:hint="请输入验证码"
        android:layout_width="200dp"
        android:layout_height="50dp"
        android:inputType="phone"
        android:ems="6"
        android:id="@+id/editText2"
        android:layout_below="@+id/p_w_picpathView"
        android:layout_alignLeft="@+id/editText"
        android:layout_alignStart="@+id/editText"
        android:layout_toLeftOf="@+id/button1"
        android:layout_toStartOf="@+id/button1" />

   
        android:scaleType="fitCenter"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:id="@+id/p_w_picpathView2"
        android:src="@drawable/zhanghao"
        android:layout_alignBottom="@+id/editText2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

   
        android:textSize="15dp"
        android:background="#ffffff"
        android:textColor="#ff00"
        android:layout_width="150dp"
        android:layout_height="30dp"
        android:text="获取验证码"
        android:id="@+id/button1"
        android:layout_alignTop="@+id/editText2"
        android:layout_alignRight="@+id/editText"
        android:layout_alignEnd="@+id/editText"
        android:layout_alignBottom="@+id/editText2" />

            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="登录"
        android:id="@+id/button2"
        android:textSize="25dp"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/checkBox"
        android:layout_below="@+id/button2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:text="同意并接受****的"/>

            android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/checkBox"
        android:text="服务条款"
        android:textColor="#00f"
        android:layout_below="@+id/button2"
        android:layout_alignBottom="@+id/checkBox"/>

 import android.os.CountDownTimer;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;


    public class MainActivity extends ActionBarActivity {
        private TimeCount time;
        private Button checking;
        @Override
        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            time = new TimeCount(30000, 1000);//构造CountDownTimer对象
            checking = (Button) findViewById(R.id.button1);
            checking.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    time.start();//开始计时
                }
            });
        }

        class TimeCount extends CountDownTimer {
            public TimeCount(long millisInFuture, long countDownInterval) {
                super(millisInFuture, countDownInterval);//参数依次为总时长,和计时的时间间隔
            }
            @Override
            public void onFinish() {//计时完毕时触发
                checking.setText("重新验证");
                checking.setClickable(true);
            }
            @Override
            public void onTick(long millisUntilFinished){//计时过程显示
                checking.setClickable(false);
                checking.setText(millisUntilFinished /1000+"秒后重新获取");
            }
        }