Android项目开发实战:倒计时

Android项目开发实战:倒计时

CountTimeMainActivity：

package com.example.counttime;

import java.util.Timer;

import java.util.TimerTask;

import android.R.integer;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class CountTimeMainActivity extends Activity implements OnClickListener {

private EditText input;

private Button gettime;

private TextView time;

private Button start;

private Button stop;

private int i=0;

private Timer timer=null;

private TimerTask task=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_count_time_main);

InitView();

}

public void InitView(){

input=(EditText) findViewById(R.id.inputtime);

gettime=(Button) findViewById(R.id.gettime);

time=(TextView) findViewById(R.id.time);

start=(Button) findViewById(R.id.starttime);

stop=(Button) findViewById(R.id.stoptime);





gettime.setOnClickListener(this);

start.setOnClickListener(this);

stop.setOnClickListener(this);



}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.gettime:

time.setText(input.getText().toString());

i=Integer.parseInt(input.getText().toString());

break;

case R.id.starttime:

startTime();

break;

case R.id.stoptime:

stopTime();

break;

default:

break;

}

}

private Handler mhandler=new Handler(){

public void handleMessage(Message msg){

time.setText(msg.arg1+"");

startTime();

};

};

public void startTime(){

timer=new Timer();

task=new TimerTask() {

@Override

public void run() {

i--;

Message message=mhandler.obtainMessage();

message.arg1=i;

mhandler.sendMessage(message);

}

};

timer.schedule(task, 1000);

}

public void stopTime(){

timer.cancel();

}

}

布局：
<LinearLayout 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:orientation="vertical"

tools:context=".CountTimeMainActivity" >

<EditText

android:id="@+id/inputtime"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:ems="10" >

<requestFocus />

</EditText>



<Button

android:id="@+id/gettime"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="获取倒计时时间" />

<TextView

android:id="@+id/time"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

<Button

android:id="@+id/starttime"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="开始计时" />

<Button

android:id="@+id/stoptime"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="停止计时" />

</LinearLayout>