android事件监听的两种方式

Android事件处理的两种模型

public void onDownloaded(); //下载完成的处理函数
}

private DownloadUtils() {
}

public static synchronized DownloadUtils instance() {
if (instance == null) {
instance = new DownloadUtils();
}
return instance;
}

private boolean isDownloading = true;

private int progress = 0;

// 实际开发中这个函数需要传入url作为参数，以获取服务器端的安装包位置
public void download(DownloadListener listener) throws InterruptedException {
while (isDownloading) {
listener.onDownloading(progress);
// 下载过程的简单模拟
Thread.sleep(1000);
progress += 10;
if (progress >= 100) {
isDownloading = false;
}
}
// 下载完成
listener.onDownloaded();
}

}

} catch (InterruptedException e) {
e.printStackTrace();
}
}

private static class MyDownloadListener implements DownloadListener {

@Override
public void onDownloading(int progress) {
System.out.println(“下载进度是：” + progress);
}

@Override
public void onDownloaded() {
System.out.println(“下载完成”);
}

} 

}

运行上面的模拟程序，输出如下所示：