Android[初级教程]第十三章 ProgressDialog控件

这次我们学习ProgressDialog控件,还是拿西游记来说,唐僧被妖怪们抓去了,那悟空得去救啊,但妖怪肯定不让啦,这就经过了一番打斗,当然,妖怪肯定打不过悟空啦,我们就用ProgressDialog来模拟打妖怪的过程,设定为100只妖怪,打完这100只妖怪才能救出师傅.看图:

呵呵,这次悟空没出手,让八戒跟沙僧抢了回头功,来看main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:text="悟空去救师傅" android:id="@+id/wukong" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="八戒去救师傅" android:id="@+id/bajie" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="沙僧去救师傅" android:id="@+id/shaseng" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout>

还是老样子,定义了几个按钮,接下来看Activity的java源码:

import android.app.Activity; import android.app.ProgressDialog; 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.Toast; public class ProgressDialogDemo extends Activity implements OnClickListener { private ProgressDialog Dialog; private Handler mhandler; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.progressdialog); Button wukong = (Button) findViewById(R.id.wukong); wukong.setOnClickListener(this); Button bajie = (Button) findViewById(R.id.bajie); bajie.setOnClickListener(this); Button shaseng = (Button) findViewById(R.id.shaseng); shaseng.setOnClickListener(this); } @Override public void onClick(View v) { //设定Handler对象,主要是处理新开线程完毕后交给主线程来处理的数据 mhandler = new Handler(){ @Override public void handleMessage(Message msg) { String name =(String)msg.obj; Toast.makeText(ProgressDialogDemo.this, name + "把师傅救出来了", 1).show(); } }; //创建ProgressDialog对象 Dialog = new ProgressDialog(this); //设定ProgressDialog的样式为进度条 Dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设定ProgressDialog的最大值为100,这里就是100只小妖怪啦 Dialog.setMax(100); //设定ProgressDialog不能取消,你不能半途而废啊,当然要100只打完啦 Dialog.setCancelable(false); String name = null; switch (v.getId()) { case R.id.wukong: //设定名字,看是谁在打妖怪啊 name = "孙悟空"; Dialog.setTitle(name); //图片 Dialog.setIcon(R.drawable.wukong); //消息 Dialog.setMessage("悟空在打妖怪"); //自定义打斗的方法 doFlight(name); break; case R.id.bajie: //同上 name = "猪八戒"; Dialog.setTitle(name); Dialog.setIcon(R.drawable.bajie); Dialog.setMessage("八戒在打妖怪"); doFlight(name); break; case R.id.shaseng: //同上 name = "沙和尚"; Dialog.setTitle(name); Dialog.setIcon(R.drawable.shaseng); Dialog.setMessage("沙僧在打妖怪"); doFlight(name); break; } } private void doFlight(final String name) { //显示ProgressDialog Dialog.show(); //新开一条线程 new Thread() { //打完妖怪的数量 int count = 0; public void run() { try { //打完妖怪小于100只的时候运行的方法 while(count <= 100){ Dialog.setProgress(count++); //睡眠0.2秒,你也得让他们休息一下啊,呵呵 Thread.sleep(200); } Dialog.cancel(); //给handler发送消息,看是谁在打妖怪,handler是主线程中的 Message message = new Message(); message.obj = name; mhandler.sendMessage(message); } catch (InterruptedException e) { Dialog.cancel(); } }; }.start(); } }

这里面涉及了子线程和主线程的通信,通过Handler可以将子线程运行的数据最终交给主线程,线程这一章我们会在接下来讲,OK,这一章也讲完了,谢谢