ProgressDialog~ProgressBar~搭配Handler顯示執行進度

本範例重點在於比較Google Default 的 Progress.
以4個Button分別啟動Progress Dialog / Progress Bar的圓與長條圖.
當Progress Dialog啟動時Activity模糊化(blur)進入OnPause()狀態, 並以執行緒(Thread)模擬事件進度.

在layout中加這一行android:visibility="gone"隱藏ProgressBar, 後兩種Button在使用者點選後, 才設為可見的setVisibility(View.VISIBLE), 而長條形的ProgressBar要特別在layout中定義style="?android:attr/progressBarStyleHorizontal"還有android:max="100"唷~

package com.tsots.Default_Progress;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class DefaultProgress extends Activity
{
  Context context = DefaultProgress.this;
  Button button1;
  Button button2;
  Button button3;
  Button button4;
  ProgressDialog myDialog = null;
  ProgressBar progressbar1;
  ProgressBar progressbar2;
  String which_progress = null;
  TextView text_percent;
  TextView text_progressbar1;
  TextView text_progressbar2;
  
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    button1 =(Button) findViewById (R.id.button1);
    button2 =(Button) findViewById (R.id.button2);
    button3 =(Button) findViewById (R.id.button3);
    button4 =(Button) findViewById (R.id.button4);
    progressbar1 = (ProgressBar) findViewById (R.id.progressbar1);
    progressbar2 = (ProgressBar) findViewById (R.id.progressbar2);
    text_percent = (TextView) findViewById (R.id.text_percent);
    text_progressbar1 = (TextView) findViewById (R.id.text_progressbar1);
    text_progressbar2 = (TextView) findViewById (R.id.text_progressbar2);
    
    final CharSequence str_Dialog_Title = getResources().getString(R.string.str_dialog_title);
    final CharSequence str_Dialog_Contents = getResources().getString(R.string.str_dialog_body);
    
    button1.setOnClickListener(new Button.OnClickListener()
    {
        public void onClick(View arg0)
        {
          which_progress = "progress_dialog";
          myDialog = ProgressDialog.show
                     (
                       context,
                       str_Dialog_Title,
                       str_Dialog_Contents, 
                       true
                     );
          fun_thread();  
        }
    });

    /*
     * 長條形的Progress, 起始值0, 最大值100
     */
    button2.setOnClickListener(new Button.OnClickListener()
    {
        public void onClick(View arg0)
        {
          which_progress = "progress_dialog";
          final CharSequence str_Dialog_Contents = getResources().getString(R.string.str_dialog_body);
          myDialog = new ProgressDialog(context);
          myDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
          myDialog.setProgress(0);
          myDialog.setMax(100);
          myDialog.setTitle(str_Dialog_Title);
          myDialog.setMessage(str_Dialog_Contents);
          myDialog.show();
          fun_thread();   
        }
    });
    
    button3.setOnClickListener(new Button.OnClickListener()
    {
        public void onClick(View arg0)
        {
          which_progress = "progress_bar1";
          progressbar1.setVisibility(View.VISIBLE);
          progressbar1.setProgress(0);
          progressbar1.setMax(100);
          text_progressbar1.setText(R.string.str_dialog_title);
          fun_thread();   
        }
    });
    
    button4.setOnClickListener(new Button.OnClickListener()
    {
        public void onClick(View arg0)
        {
          which_progress = "progress_bar2";
          progressbar2.setVisibility(View.VISIBLE);
          progressbar2.setProgress(0);
          progressbar2.setMax(100);  
          text_progressbar2.setText(R.string.str_dialog_body);
          fun_thread();   
        }
    });
  }
  
  /*
   * 透過Handler傳遞執行序的狀態
   */
  Handler handler = new Handler()
  {
      public void handleMessage(Message msg)
      {
        int p = msg.getData().getInt("PERCENT");
        //當事件進度抵達100時, 關掉/隱藏 ProgressDialog/ProgressBar
        if(p > 100)
        {          
            if(which_progress.equals("progress_dialog"))
            {
              myDialog.dismiss();
            }
            else if(which_progress.equals("progress_bar1"))
            {
              progressbar1.setVisibility(View.GONE);
              text_progressbar1.setText("");
            }
            else
            {
              progressbar2.setVisibility(View.GONE);
              text_progressbar2.setText("");
              text_percent.setText("");
            }
        }
        else
        {
          if(which_progress.equals("progress_dialog"))
          {
            myDialog.setProgress(p);
          }
          else if(which_progress.equals("progress_bar2"))
          {
            progressbar2.setProgress(p);
            text_percent.setText(p+"%");
          }
        }
      }
  };
  
  /*
   * 執行緒, 每隔一秒遞增值1, 用來模擬事件進度
   */
  public void fun_thread()
  {
      new Thread()
      { 
        public void run()
        { 
          try
          { 
            for(int i=0; i<6; i++)
            {
              sleep(1000);
              int percent = (i+1)*20;
              Message m = new Message();
              Bundle b = m.getData();
              b.putInt("PERCENT", percent);
              m.setData(b);
              handler.sendMessage(m);
            }
          }
          catch (Exception e)
          {
            e.printStackTrace();
          }
          finally
          {
            //myDialog.dismiss();
          }
        }
      }.start(); 
  }
}