Android ProgressDialog 转圈圈

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转圏圏型的等待

ProgressBarDemo.java：

package com.lveyo.android.demo.progressbar;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.widget.Button;import android.widget.TextView;public class ProgressBarDemo extends Activity {       privateTextView statusTextView;    privateButton beginBtn;    privateProgressDialog progressDialog;      @Override    public voidonCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);       statusTextView = (TextView)findViewById(R.id.status);       beginBtn = (Button)findViewById(R.id.beginBtn);       setListener();    }          privateHandler handler = new Handler(){      @Override       public voidhandleMessage(Message msg) {                  //关闭ProgressDialog         progressDialog.dismiss();                   //更新UI         statusTextView.setText("Completed!");       }};                private voidsetListener(){      beginBtn.setOnClickListener(new View.OnClickListener() {                  @Override          public voidonClick(View v) {                        //显示ProgressDialog            progressDialog = ProgressDialog.show(ProgressBarDemo.this,"Loading...", "Please wait...", true, false);                         //新建线程             newThread(){               @Override                public voidrun() {                  //需要花时间计算的方法                  Calculation.calculate(4);                                    //向handler发消息                  handler.sendEmptyMessage(0);               }}.start();          }       });    }   }

Calculation.java

package com.lveyo.android.demo.progressbar;public class Calculation {       publicstatic void calculate(int sleepSeconds){       try {         Thread.sleep(sleepSeconds * 1000);       } catch(Exception e) {          // TODO:handle exception       }    }}

main.xml文件

<?xml version="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"   android:orientation="vertical"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   ><TextView android:id="@+id/status"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:text="@string/hello"   /><Button android:id="@+id/beginBtn"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:text="begin"   /></LinearLayout>