Android Tutorial => Intent

Introduction

An Intent is a small message passed around the Android system. This message may hold information about our intention to perform a task.

It is basically a passive data structure holding an abstract description of an action to be performed.

Syntax

Intent Intent()
Intent Intent(Intent intent)
Intent Intent(String action)
Intent Intent(String action, Uri uri)
Intent Intent(Context packageContext, Class<?> cls)
Intent Intent(String action, Uri uri, Context packageContext, Class<?> cls)
void startActivity(Intent intent)
void startActivity(Intent intent, Bundle options)
void startActivityForResult (Intent intent, int requestCode)
void startActivityForResult (Intent intent, int requestCode, Bundle options)
Intent putExtra(String name, double[] value)
Intent putExtra(String name, int value)
Intent putExtra(String name, CharSequence value)
Intent putExtra(String name, char value)
Intent putExtra(String name, Bundle value)
Intent putExtra(String name, Parcelable[] value)
Intent putExtra(String name, Serializable value)
Intent putExtra(String name, int[] value)
Intent putExtra(String name, float value)
Intent putExtra(String name, byte[] value)
Intent putExtra(String name, long[] value)
Intent putExtra(String name, Parcelable value)
Intent putExtra(String name, float[] value)
Intent putExtra(String name, long value)
Intent putExtra(String name, String[] value)
Intent putExtra(String name, boolean value)
Intent putExtra(String name, boolean[] value)
Intent putExtra(String name, short value)
Intent putExtra(String name, double value)
Intent putExtra(String name, short[] value)
Intent putExtra(String name, String value)
Intent putExtra(String name, byte value)
Intent putExtra(String name, char[] value)
Intent putExtra(String name, CharSequence[] value)

Parameters

Parameter	Details
intent	The intent to start
requestCode	Unique number to identify the request
options	Additional options for how the Activity should be started
name	The name of the extra data
value	The value of the extra data
CHOOSE_CONTACT_REQUEST_CODE	the code of the request, to identify it on `onActivityResult` method
action	Any action to perform via this intent, ex: Intent.ACTION_VIEW
uri	data uri to be used by intent to perform specified action
packageContext	Context to use to initialize the Intent
cls	Class to be used by this intent

Remarks

Caveats of using implicit intent

When calling a implicit intent it's always helpful to check if it's possible by the system to handle it.

This can be done by checking using PackageManager.queryIntentActivities(Intent intent, int flags)

PackageManager pm = getActivity().getPackageManager();
if (intent.resolveActivity(pm) != null) {
    //intent can be handled
    startActivity(intent);
} else {
     //intent can not be handled
}

Starting Activity which is a `singleTask` or `singleTop`

When the activity's launch mode is singleTask or singleTop, the onActivityResult will be called as soon as the activity is started with a data null. To prevent this, use Intent.setFlags(0) to reset the default flags.

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Android

Fastest Entity Framework Extensions

Introduction

Syntax

Parameters

Remarks

Caveats of using implicit intent

Starting Activity which is a `singleTask` or `singleTop`

Got any Android Question?

Android

Android Intent

Fastest Entity Framework Extensions

Introduction

Syntax

Parameters

Remarks

Caveats of using implicit intent

Starting Activity which is a singleTask or singleTop

Intent Related Examples

Got any Android Question?

Starting Activity which is a `singleTask` or `singleTop`