转载请注明出入:http://blog.csdn.net/forwardyzk/article/details/42640031

模拟扫描文件的效果，模拟雷达扫描。

思路:

1.使用旋转动画和渐变动画的结合。

2.使用线程和Handler进行消息的传递，刷新界面

不要在主线程上做耗时操作，不要在主线程上刷新界面。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="120dip"
        android:orientation="horizontal" >

        <FrameLayout
            android:layout_width="120dip"
            android:layout_height="120dip" >

            <ImageView
                android:layout_width="80dip"
                android:layout_height="80dip"
                android:layout_gravity="center"
                android:src=http://www.mamicode.com/"@drawable/act_radar_bg" />>MainActivity.java
初始化动画
animation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF,
				0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
		animation.setDuration(2000);
		animation.setRepeatCount(Animation.INFINITE);

		animation2 = new AlphaAnimation(0.0f, 1.0f);
		animation2.setDuration(3000);
		animation2.setRepeatCount(Animation.INFINITE);
		im_scan.startAnimation(animation);
		im_dian.startAnimation(animation2);

开启线程
thread = new Thread() {
			public void run() {
				pb_loding.setMax(200);
				for (count = 1; count <= pb_loding.getMax(); count++) {
					Message msg = Message.obtain();
					msg.what = SCAN_LODING;
					handler.sendMessage(msg);
					pb_loding.setProgress(count);
					SystemClock.sleep(200);
				}
				Message msg = Message.obtain();
				msg.what = FINSH_SCAN;
				handler.sendMessage(msg);
			};
		};
		thread.start();

刷新界面
private Handler handler = new Handler() {
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case SCAN_LODING:
				TextView tv = new TextView(MainActivity.this);
				tv.setTextSize(14);
				tv_count.setText("已扫描:" + count + "个文件");
				tv_lodingApk.setText("正在扫描:第" + count + "个文件");
				if (count - 1 != 0)
					tv.setText("第" + (count - 1) + "个文件已经扫描");
				ll_scanText.addView(tv, 0);
				break;
			case FINSH_SCAN:
				tv_lodingApk.setText("扫描完毕");
				TextView tv1 = new TextView(MainActivity.this);
				tv1.setTextSize(14);
				tv1.setText("第" + count + "个文件已经扫描");
				ll_scanText.addView(tv1, 0);
				im_scan.clearAnimation();// 清除此ImageView身上的动画
				im_dian.clearAnimation();// 清除此ImageView身上的动画
				break;
			}
		};
	};

源码下载: http://download.csdn.net/detail/forwardyzk/8352683 
效果图:


雷达扫描