尝试从 BroadcastReceiver 中触发 Intent.ACTION_VIEW 时 Android Activity 崩溃

Question

我的 Activity 应该下载一个文件，然后通过发送 Intent.ACTION_VIEW 打开它。下载本身工作正常，之后我可以在“下载”部分访问它。如果我使用 DownloadManager.ACTION_VIEW_DOWNLOADS Intent 而不是 Intent.ACTION_VIEW，它也可以正常工作。

但是当使用 Intent.ACTION_VIEW 时， Activity 崩溃了。

public class RESTTestDownloadActivity extends SOFAActivity {

private DownloadManager downloadManager;
private IntentFilter downloadFilter;
private BroadcastReceiver downloadReceiver;
private long downloadID;

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    
    setTitle("RESTTestDownloadActivity");

    downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    
    TestGetAttachment();
}

private void TestGetAttachment(){
    
    downloadFilter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE); 

    DownloadManager.Request request = new DownloadManager.Request(Uri.parse("http://address:port/directory/testGetAttachment"));
    downloadID = downloadManager.enqueue(request);
    
    downloadReceiver = new BroadcastReceiver() {
    
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            Toast.makeText(RESTTestDownloadActivity.this, "ACTION_DOWNLOAD_COMPLETE received.", Toast.LENGTH_LONG);
            DownloadManager.Query query = new DownloadManager.Query();
            query.setFilterById(downloadID);
            Cursor cursor = downloadManager.query(query);
            if(cursor.moveToFirst()){
                System.out.println("Download matches.");
                int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
                int status = cursor.getInt(columnIndex);
                int columnReason = cursor.getColumnIndex(DownloadManager.COLUMN_REASON);
                int reason = cursor.getInt(columnReason);

                if(status!=DownloadManager.STATUS_SUCCESSFUL){
                    System.out.println("Download != STATUS_SUCCESSFUL.");
                    AlertDialogBuilder.setTitle("Error")
                        .setMessage(reason)
                        .setPositiveButton("OK", null)
                        .show();
                } else {
                    System.out.println("Download = STATUS_SUCCESSFUL.");
                    Toast.makeText(RESTTestDownloadActivity.this, "Download successful.", Toast.LENGTH_LONG).show();
                    Uri dlUri = Uri.parse(cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI)));
                    System.out.println("Download-URI: " + dlUri.toString());
                    unregisterReceiver(downloadReceiver);
                    downloadReceiver = null;
                    // This is working perfectly fine
                    startActivity(new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS));
                    // But this is crashing
//                  Intent i = new Intent(Intent.ACTION_VIEW, dlUri);
//                  i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//                  startActivity(i);
                }
                downloadManager.remove(downloadID);
                downloadReceiver = null;
            } 
        }
    };
    registerReceiver(downloadReceiver, downloadFilter);

}

@Override
public void onPause(){
    super.onPause();
    if(downloadReceiver!=null){
        System.out.println("Unregistering downloadReceiver...");
        unregisterReceiver(downloadReceiver);
    }
}
@Override
public void onResume(){
    super.onResume();
    if(downloadReceiver!=null){
        System.out.println("Registering downloadReceiver...");
        registerReceiver(downloadReceiver, downloadFilter);
    }
}

如您所见，我已经尝试添加提到的 FLAG_ACTIVITY_NEW_TASK here .

LogCat 会输出以下内容:

08-05 13:04:35.437: INFO/System.out(2449): *.RESTTestDownloadActivity.onResume()

08-05 13:04:35.446: INFO/System.out(2449): Registering downloadReceiver...

08-05 13:04:35.846: INFO/ActivityManager(77): Displayed *.RESTTestDownloadActivity: +561ms

08-05 13:04:36.046: INFO/DownloadManager(274): Initiating request for download 24

08-05 13:04:40.956: DEBUG/dalvikvm(216): GC_EXPLICIT freed 26K, 47% free 3220K/6023K, external 6059K/7285K, paused 68ms

08-05 13:04:45.855: DEBUG/dalvikvm(157): GC_CONCURRENT freed 795K, 56% free 2872K/6471K, external 2402K/2630K, paused 10ms+15ms

08-05 13:04:46.135: INFO/System.out(2449): Download gefunden.

08-05 13:04:46.135: INFO/System.out(2449): Download = STATUS_SUCCESSFUL.

08-05 13:04:46.155: INFO/System.out(2449): Download-URI: content://downloads/my_downloads/24

08-05 13:04:46.165: INFO/ActivityManager(77): Starting: Intent { act=android.intent.action.VIEW dat=content://downloads/my_downloads/24 flg=0x10000000 } from pid 2449

08-05 13:04:46.175: DEBUG/AndroidRuntime(2449): Shutting down VM

08-05 13:04:46.185: WARN/dalvikvm(2449): threadid=1: thread exiting with uncaught exception (group=0x40015560)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): FATAL EXCEPTION: main

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.DOWNLOAD_COMPLETE pkg=* (has extras) } in *.RESTTestDownloadActivity$1@405376e8

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.os.Handler.handleCallback(Handler.java:587)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.os.Handler.dispatchMessage(Handler.java:92)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.os.Looper.loop(Looper.java:123)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.ActivityThread.main(ActivityThread.java:3683)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at java.lang.reflect.Method.invokeNative(Native Method)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at java.lang.reflect.Method.invoke(Method.java:507)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at dalvik.system.NativeStart.main(Native Method)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=content://downloads/my_downloads/24 flg=0x10000000 }

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1409)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.Activity.startActivityForResult(Activity.java:2827)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.Activity.startActivity(Activity.java:2933)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at ***.RESTTestDownloadActivity$1.onReceive(RESTTestDownloadActivity.java:75)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709)

08-05 13:04:46.195: ERROR/AndroidRuntime(2449): ... 9 more

08-05 13:04:46.216: WARN/ActivityManager(77): Force finishing activity *.RESTTestDownloadActivity

08-05 13:04:46.739: WARN/ActivityManager(77): Activity pause timeout for HistoryRecord{408abbf0 *.RESTTestDownloadActivity}

知道为什么只有 Intent.ACTION_VIEW 会导致崩溃吗？提前致谢!

Answer 1

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=content://downloads/my_downloads/24 flg=0x10000000 }

请将 MIME 类型添加到您的 Intent 中，以帮助 Android 为您找到合适的 Activity 。