最最基础的Android倒计时应用

来源：互联网发布：云计算是谁提出的编辑：程序博客网时间：2024/05/29 05:01

只精确到秒

activity_main.xml

<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="com.example.counttime.MainActivity" >            <EditText        android:id="@+id/inputtime"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:ems="10"        android:inputType="number"        android:maxLength="9"        >        <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="match_parent"        android:layout_height="wrap_content"        android:textSize="40sp"        android:textColor="#0000FF"        android:gravity="center"         />    <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>

MainActivity.java

package com.example.counttime;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{private EditText inputet;private Button getTime,startTime,stopTime;private TextView time;private int i = 0;private Timer timer;private TimerTask task = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView(){inputet = (EditText) findViewById(R.id.inputtime);getTime = (Button) findViewById(R.id.gettime);startTime = (Button) findViewById(R.id.starttime);stopTime = (Button) findViewById(R.id.stoptime);time = (TextView) findViewById(R.id.time);getTime.setOnClickListener(this);startTime.setOnClickListener(this);stopTime.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.gettime:if(inputet.getText().toString().length()>0){stopTime();time.setText(inputet.getText().toString());i = Integer.parseInt(inputet.getText().toString());}break;case R.id.starttime:startTime();break;case R.id.stoptime:stopTime();break;}}private Handler handler = new Handler(){public void handleMessage(Message msg) {if(time.length()>0){time.setText(msg.arg1+"");if(!time.getText().toString().equals("0")){startTime();}}};};public void startTime(){timer = new Timer();task = new TimerTask() {@Overridepublic void run() {i--;Message message = handler.obtainMessage();message.arg1 = i;handler.sendMessage(message);}};timer.schedule(task, 1000);}public void stopTime(){if(timer == null){timer = new Timer();}timer.cancel();}}

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