不推薦這樣寫。
推薦這篇： http://gundumw100.iteye.com/blog/1059297

又是好久沒更新博客了，呵呵，忙著上班，忙著帶團！一句話，忙著生活賺錢!好吧，廢話不多少，今天要寫的是loading效果，先給大家看個效果圖


程序在加載的時候下面的進度條不斷變化，我這里并沒有用android自帶的動畫，寫的是一種方法，方法很簡單，就是不斷地繪制2張圖片，利用5個ImageView不斷設置不同背景。利用handler來動態更新。兩張圖片用ps做出來，見下圖:




第二張圖片是白色的

下面請看代碼

    //不斷發送消息，切換圖片
private void playAnimation()
	{
		new Thread(){
			@Override
			public void run()
			{
				while(true)
				{
					for(int i=5;i>0;i--)
					{
						handler.sendEmptyMessage(i);
						try {
							this.sleep(300);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}

				}

			}

		}.start();
	}
//handler接受消息進行變化
handler=new Handler(){

			@Override
			public void handleMessage(Message msg) {
				 c.getResources();
				switch(msg.what)
				{
				case 1:
					imgview_1.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_blue));
					imgview_2.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_3.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_4.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_5.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					break;
				case 2:
					imgview_1.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_2.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_blue));
					imgview_3.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_4.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_5.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					break;
				case 3:
					imgview_1.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_2.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_3.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_blue));
					imgview_4.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_5.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					break;
				case 4:
					imgview_1.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_2.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_3.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_4.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_blue));
					imgview_5.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					break;
				case 5:
					imgview_1.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_2.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_3.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_4.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_white));
					imgview_5.setImageDrawable(c.getResources().getDrawable(R.drawable.loading_blue));
					break;
				}
			}
		};
  

當然，也可以把圖片換成其他形狀的比如說圓形，大家可以發揮自己的想象力。

這邊是我弄的圖片:
好啦，這就是大體上的代碼，布局文件很簡單，就不貼上啦,有問題的朋友可以聯系我leepood@gmail.com，祝大家安好！
http://www.leepood.org/#/new-to-android/listview_page/

android監控程序的開啟與關閉
http://www.leepood.org/#/new-to-android/android-monitor-apps/

Android程序首頁Loading效果