一个简单的秒表实现

目录

                                          一个简单的秒表实现

一、目录结构

二、MainActivity类

 三、activity_main.xml

四、实现样图

一、目录结构

二、MainActivity类

package com.example.news;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {
	
	private TextView viewById;
	int textnum = 60;
	private Handler handler = new Handler() {
		
		public void handleMessage(Message msg) {
			viewById.setText(msg.obj.toString());
			runCount();
		};
	};


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		viewById = (TextView)findViewById(R.id.tv_count);
		viewById.setText(String.valueOf(textnum));
		runCount();
	}
	
	public void runCount() {
		
		Message obtain = Message.obtain();
		textnum = (textnum == 0)?(60 + 1):Integer.parseInt(viewById.getText().toString());
		
		Log.i("textnum", String.valueOf(textnum));
		obtain.obj = textnum - 1;
		handler.sendMessageDelayed(obtain, 1000);
	}
}

 三、activity_main.xml

<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="com.example.news.MainActivity" >

    <TextView
        android:id="@+id/tv_count"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="100sp"
        android:background="#bf12ab"
        android:height="100dp"
        android:gravity="center"
        />

</RelativeLayout>

四、实现样图