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58 lines
2.2 KiB
58 lines
2.2 KiB
8 years ago
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# 广播使用
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#### 一、创建广播接收器，用来接收下载的各种状态
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```java
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private BroadcastReceiver mReceiver = new BroadcastReceiver() {
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long len = 0;
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@Override public void onReceive(Context context, Intent intent) {
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String action = intent.getAction();
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//可以通过intent获取到下载实体，下载实体中包含了各种下载状态
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DownloadEntity entity = intent.getParcelableExtra(DownloadManager.ENTITY);
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switch (action) {
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case DownloadManager.ACTION_PRE: //预处理
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break;
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case DownloadManager.ACTION_POST_PRE: //预处理完成
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//预处理完成，便可以获取文件的下载长度了
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len = entity.getFileSize();
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break;
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case DownloadManager.ACTION_START: //开始下载
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L.d(TAG, "download start");
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break;
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case DownloadManager.ACTION_RESUME: //恢复下载
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L.d(TAG, "download resume");
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long location = intent.getLongExtra(DownloadManager.CURRENT_LOCATION, 1);
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break;
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case DownloadManager.ACTION_RUNNING: //下载中
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long current = intent.getLongExtra(DownloadManager.CURRENT_LOCATION, 0);
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break;
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case DownloadManager.ACTION_STOP: //停止下载
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L.d(TAG, "download stop");
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break;
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case DownloadManager.ACTION_COMPLETE: //下载完成
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break;
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case DownloadManager.ACTION_CANCEL: //取消下载
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break;
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case DownloadManager.ACTION_FAIL: // 下载失败
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break;
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}
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}
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};
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```
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#### 二、在Activity中创建广播过滤器
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```java
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@Override protected void onResume() {
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super.onResume();
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IntentFilter filter = new IntentFilter();
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filter.addDataScheme(getPackageName());
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filter.addAction(DownloadManager.ACTION_PRE);
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filter.addAction(DownloadManager.ACTION_POST_PRE);
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filter.addAction(DownloadManager.ACTION_RESUME);
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filter.addAction(DownloadManager.ACTION_START);
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filter.addAction(DownloadManager.ACTION_RUNNING);
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filter.addAction(DownloadManager.ACTION_STOP);
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filter.addAction(DownloadManager.ACTION_CANCEL);
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filter.addAction(DownloadManager.ACTION_COMPLETE);
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filter.addAction(DownloadManager.ACTION_FAIL);
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registerReceiver(mReceiver, filter);
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}
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```
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