Calling startActivity() from outside of an Activity context

Either

• cache the Context object via constructor in your adapter, or
• get it from your view.

Or as a last resort,

• add - FLAG_ACTIVITY_NEW_TASK flag to your intent:

_

myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

Edit - i would avoid setting flags as it will interfere with normal flow of event and history stack.

You can achieve it with addFlags instead of setFlags

myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

According to the documentation it does:

Add additional flags to the intent (or with existing flags value).

EDIT

Be aware if you are using flags that you change the history stack as Alex Volovoy's answer says:

...avoid setting flags as it will interfere with normal flow of event and history stack.

Instead of using (getApplicationContext) use YourActivity.this

If you got error because of using create chooser like below:

Intent sharingIntent = new Intent(Intent.ACTION_VIEW);
sharingIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sharingIntent.setData(Uri.parse("http://google.com"));
startActivity(Intent.createChooser(sharingIntent, "Open With"));

Set the flag to create chooser like this :

Intent sharingIntent = new Intent(Intent.ACTION_VIEW);
sharingIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sharingIntent.setData(Uri.parse("http://google.com"));

Intent chooserIntent = Intent.createChooser(sharingIntent, "Open With");
chooserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

startActivity(chooserIntent);