1、在处理下载管理时，服务在后台运行，下载完成后要更新listview列表的按钮，将“下载”改成“打开”这样一个功能。
在Activity里面写一个静态内部类，继承广播。其中属性text_button的值就是按钮显示的文字。通过mAdapter.notifyDataSetChanged()更新列表数据显示。
public static class DownloadFinishReceiver extends BroadcastReceiver{ public static final String DOWNLOAD_RECEIVER="com.DownloadFinishReceiver"; @Override public void onReceive(Context context, Intent intent) { try { if (intent.getAction().equals(DOWNLOAD_RECEIVER)) { //传递的下载地址 String url = intent.getStringExtra("url"); for(Apply apply : mApplies) { if (apply.getDownload_backup().equals(url)) { apply.setText_button("打开"); } } mAdapter.notifyDataSetChanged(); } } catch (Exception e) { e.printStackTrace(); } } }
2、在后台服务service里面注册和销毁广播
private DownloadFinishReceiver finishReceiver; public void onCreate() { System.out.println("创建服务"); IntentFilter intentFilter = new IntentFilter(DownloadFinishReceiver.DOWNLOAD_RECEIVER); finishReceiver = new DownloadFinishReceiver(); registerReceiver(finishReceiver, intentFilter); super.onCreate(); } public void onDestroy() { unregisterReceiver(finishReceiver); super.onDestroy(); }
3、一旦下载完成，就发送广播。
Intent intent = new Intent(DownloadFinishReceiver.DOWNLOAD_RECEIVER); intent.putExtra("url", "http://www.baidu.com/pic/qqq.png"); sendBroadcast(intent);