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I'm a newbie to mobile app development and I'm trying to follow this tutorial
https://www.dropbox.com/developers-v1/dropins/chooser/android
But the problem is when I click the button "Chooser", it pop-up a message like this so i cannot go to the next step (which is choosing a file).
If I click "Install", the app will crash with this exception: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=market://details?id=com.dropbox.android }
Sorry if I post this question in the wrong place, I couldn't find the solution
Are you using an Android emulator (as opposed to a physical device), or otherwise some device without the Play Store?
The Dropbox Chooser itself is built in to the official Dropbox app, which is why the library prompts you to install the app if it isn't found. TheActivityNotFoundException error message is indicating that the system doesn't have the market available though, so you'll need to use a device with the Play Store installed to test this properly.
is it compulsory to download dropbox app? how can I show dropbox file list with thumbnail for download purpose pragmatically in android, without download dropbox app?
If you want to use the Android Dropbox Chooser, yes, the official Dropbox app needs to be installed, since the Chooser is built into the official Dropbox app.
If that won't be sufficient for your app, you can use the API itself build your own file list, get thumbnails, etc.:
https://www.dropbox.com/developers/documentation/java
That would be substantially more work though.
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