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);
}
}