Question

我正在尝试创建一个监听下载并在听到后执行操作的应用程序。这里的关键是我希望应用程序即使在最小化时也是如此（例如当用户从浏览器下载时）。以下代码似乎没有绊倒接收器：

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

         BroadcastReceiver receiver = new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    System.out.println("did download");

                    String action = intent.getAction();
                    if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
                        String downloadPath = intent.getStringExtra(DownloadManager.COLUMN_URI);
                        System.out.println(downloadPath);
                    }

                }
            };

            registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));


    }



}

任何人都知道什么是错的？

Answer 1

只需在清单中声明广播接收器即可。有关动态寄存器和静态寄存器之间差异的更多信息，请参阅BroadcastReceiver

Answer 2

您几乎只需将BroadcastReceiver移至单独的文件即可。使用收到的字符串downloadPath执行您想要的操作。在此示例中，我将其保存到SharedPreferences。

public class MyBroadcastReceiver extends BroadcastReceiver{
    @Override
    public void onReceive(final Context context, Intent intent) {

        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = settings.edit();

        String action = intent.getAction();
        if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
            String downloadPath = intent.getStringExtra(DownloadManager.COLUMN_URI);
            editor.putString("downloadPath", downloadPath);
            editor.commit();
        }
    }
}

在您的清单中添加此内容并编辑action

<receiver android:name=".MyBroadcastReceiver " >
    <intent-filter>
        <action android:name="PUT YOUR ACTION HERE DownloadManager.ACTION_DOWNLOAD_COMPLETE" />
    </intent-filter>
</receiver>

在应用程序最小化时监听下载

2 个答案: