360手机卫士—扫描杀雷达效果[通俗易懂]

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <!-- 背景是雷达图片 -->
        <FrameLayout
            android:layout_width="80dp"
            android:layout_height="match_parent" 
            android:background="@drawable/ic_scanner_malware">
            <ImageView
                android:id="@+id/iv_main_scan"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:src="@drawable/act_scanning_03" />
        </FrameLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:orientation="vertical" 
            android:gravity="center_vertical">

            <TextView
                android:id="@+id/tv_main_scan"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="杀毒引擎待命..." />

            <ProgressBar
                android:id="@+id/pb_main_scan"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" 
                
                android:progressDrawable="<span style="color:#ff0000;">@drawable/my_progress</span>"/>
            	<!--  progressDrawable : 指定进度背景和进度图片-->
        </LinearLayout>

    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
   
   <!-- 指定进度条的背景图片 -->
    <item android:id="@android:id/background"
        android:drawable="@drawable/security_progress_bg"></item>

    <!-- 指定进度条的进度图片 -->
    <item android:id="@android:id/progress"
        android:drawable="@drawable/security_progress"></item>
</layer-list>

package com.atguigu.l10_app;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private ImageView iv_main_scan;
	private TextView tv_main_scan;
	private ProgressBar pb_main_scan;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 旋转的图片
		iv_main_scan = (ImageView) findViewById(R.id.iv_main_scan);
		// 字体提示
		tv_main_scan = (TextView) findViewById(R.id.tv_main_scan);
		// 进度条
		pb_main_scan = (ProgressBar) findViewById(R.id.pb_main_scan);

		// 启动扫描动画
		startScanAnimation();

		// 開始扫描应用
		startScan();
	}

	/**
	 * 启动分线程扫描应用
	 */
	private void startScan() {
		new AsyncTask<Void, Void, Void>() {
			// 更新进度条之前先进行友好提示
			@Override
			protected void onPreExecute() {
				tv_main_scan.setText("開始扫描杀毒!");
			}

			@Override
			protected Void doInBackground(Void... params) {
				int appCount = 100;
				for (int i = 0; i < appCount; i++) {
					try {
						Thread.sleep(100);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					// 通知更新进度条
					publishProgress();
				}
				return null;
			}

			// 同步进度的显示
			protected void onProgressUpdate(Void[] values) {
				pb_main_scan.incrementProgressBy(1);
			}

			// 清除动画效果
			protected void onPostExecute(Void result) {
				tv_main_scan.setText("没有病毒, 请放心使用!");
				Toast.makeText(MainActivity.this, "扫描完毕, 没有发现病毒!", 0).show();
				// 停止扫描动画
				iv_main_scan.clearAnimation();
			}
		}.execute();
	}

	/**
	 * 启动扫描动画
	 */
	private void startScanAnimation() {
		RotateAnimation animation = new RotateAnimation(0f, 360f,
				Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
				0.5f);
		animation.setDuration(1000);
		animation.setRepeatCount(Animation.INFINITE);// 不限定反复次数
		// 旋转的图片启动动画效果
		iv_main_scan.startAnimation(animation);
	}
}