1. 时钟显示
定义布局文件——activity_my_analog_clock_thread_demo.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_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.contactsdemo.MyAnalogClockThreadDemo" > <AnalogClock android:id="@+id/myAnalogClock" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>
定义Activity程序,进行操作
package com.example.contactsdemo; import java.text.SimpleDateFormat; import java.util.Date; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView; public class MyAnalogClockThreadDemo extends ActionBarActivity { private TextView info = null; //文本显示组件 private static final int SET = 1; //线程标记 private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch(msg.what){ case SET: //判断标志位 MyAnalogClockThreadDemo.this.info. setText("当前时间为:"+msg.obj.toString()); //设置显示信息 } } }; private class ClockThread implements Runnable{ @Override public void run() { while(true){ Message msg = MyAnalogClockThreadDemo.this.handler .obtainMessage(MyAnalogClockThreadDemo.SET, new SimpleDateFormat("yyyy-MM-dd HH-mm-ss").format(new Date())); //实例化Message MyAnalogClockThreadDemo.this.handler.sendMessage(msg); //发送消息 try { Thread.sleep(1000); //延迟1秒 } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my_analog_clock_thread_demo); this.info = (TextView) super.findViewById(R.id.info); //取得组件 new Thread(new ClockThread()).start(); //启动线程 } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.my_analog_clock_thread_demo, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
2. 异步处理工具类:AsyncTask——实现进度条
定义布局文件——activity_my_async_task_demo.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_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.contactsdemo.MyAsyncTaskDemo" > <ProgressBar android:id="@+id/bar" android:layout_width="fill_parent" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal"/> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>
定义Activity程序,显示进度条
package com.example.contactsdemo; import android.support.v7.app.ActionBarActivity; import android.os.AsyncTask; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.ProgressBar; import android.widget.TextView; public class MyAsyncTaskDemo extends ActionBarActivity { private ProgressBar bar = null; //进度条组件 private TextView info = null; //文本显示组件 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my_async_task_demo); this.bar = (ProgressBar) super.findViewById(R.id.bar); this.info = (TextView) super.findViewById(R.id.info); ChildUpdate child = new ChildUpdate(); //子任务对象 child.execute(100); //休眠时间 } private class ChildUpdate extends AsyncTask<Integer, Integer, String>{ @Override protected void onPostExecute(String result) { //任务执行完后执行 MyAsyncTaskDemo.this.info.setText(result); //设置文本 } @Override protected void onProgressUpdate(Integer... values) { //每次更新后的数值 MyAsyncTaskDemo.this.info.setText("当前进度是:"+values[0]); //更新文本信息 } @Override protected String doInBackground(Integer... arg0) { //处理后台任务 for(int i=0;i<100;i++){ //进度条累加 MyAsyncTaskDemo.this.bar.setProgress(i); //设置进度 this.publishProgress(i); //传递每次更新的内容 try { Thread.sleep(arg0[0]); //延缓执行 } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return "执行完毕!"; } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.my_async_task_demo, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
时间: 2024-10-09 22:20:26