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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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