Android简单倒计时器

安卓简单倒计时器。

就一个Activity：

package com.example.countdown;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

/*简单倒计时例子By KevinWu*/
public class MainActivity extends Activity {

	private TimeCount timeCount;
	EditText text1;
	Button button1;
	TextView timecounting;
	int i;//定义一个记录输入数据的整形

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Click();
	}

	public void Click() {
		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				input();
			}
		});

	}

	private void input() {
		text1 = (EditText) findViewById(R.id.editText1);
		String time = text1.getText().toString();
		if(time.equals("")){
			Toast.makeText(MainActivity.this, "请输入秒数再点击开始！", Toast.LENGTH_LONG).show();
			Click();
		}else{
			i = Integer.parseInt(time);
			initData();
		}
		
	}

	private void initData() {
		setContentView(R.layout.run);
		timecounting = (TextView) findViewById(R.id.timecounting);
		timeCount = new TimeCount(i * 1000, 1000);
		timeCount.start();
	}

	class TimeCount extends CountDownTimer {
		public TimeCount(long millisInFuture, long countDownInterval) {
			super(millisInFuture, countDownInterval);
		}

		@Override
		public void onTick(long millisUntilFinished) {
			// TODO Auto-generated method stub
			timecounting.setText((millisUntilFinished / 1000) + "秒");
		}

		@Override
		public void onFinish() {
			// TODO Auto-generated method stub
			dialog();
		}
	}

	public void dialog() {
		AlertDialog.Builder builder = new Builder(this);
		builder.setMessage("\n时间到！！！！！！\n");

		builder.setTitle("提醒");

		builder.setPositiveButton("重新计时",
				new android.content.DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						setContentView(R.layout.activity_main);
						Click();
					}
				});
		builder.setNegativeButton("退出程序",
				new android.content.DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						finish();
					}
				});
		builder.create().show();
	}

}

定义了两个布局，第一个布局为刚进去程序显示出来的布局：

该布局XML代码为：

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

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/timecounting"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="58dp"
        android:ems="10"
        android:inputType="number" 
        android:hint="请输入要倒计时的秒数">
        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="开始" />

    <TextView
        android:id="@+id/timecounting"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="102dp"
        android:text="请输入秒数"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

第二个布局在点击开始按钮后触发，如下所示：

该布局代码如下：

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="44dp"
        android:text="剩余时间为"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/timecounting"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="58dp"
        android:text="请输入秒数"
        android:textSize="20pt" />

   

</RelativeLayout>

源代码下载：去下载源代码