Cannot pass custom Object in an Intent: The Method Put Extra is Ambiguous for the type Intent

Question

If I try to write ``` Car myCarObject=getCar(); Intent details = new Intent(Start.this, DetailsCar.class); details.putExtra("Car", myCarObject); startActivity(details); ``` Eclipse show me a compilation error "The Method Put Extra is Ambiguous for the type Intent" in the line ``` details.putExtra("Car", myCarObject); ``` If I use the code ``` Car myCarObject=getCar(); ArrayList parcelableExtra = new ArrayList(); parcelableExtra.add(myCarObject); Intent details = new Intent(Start.this, DetailsCar.class); details.putExtra("Car", parcelableExtra); startActivity(dettagli); ``` And I try to load the extra with this code in the destination Intent with ``` ArrayList parcelableExtra = new ArrayList(); parcelableExtra = (ArrayList) getIntent().getExtras().getParcelable("Car"); Car c=parcelableExtra.get(0); ``` I get this warning ``` 12-14 05:30:07.669: W/Bundle(19823): Key Car expected Parcelable but value was a java.util.ArrayList. The default value was returne…

Accepted Answer

The first error: 'The Method Put Extra is Ambiguous for the type Intent'.

The class `Car` is both `Serializable` and `Parcelable`, the compiler doesn't know whether to use `putExtra(Serializable s)` or `putExtra(Parcelable p)` to handle your request. So you have to cast your `Car` to one of them when using `Intent.putExtra()`.

```
Intent.putExtra("car", (Parcelable)myCarObject);
Intent.putExtra("car", (Serializable)myCarObject);
```

The second error: java.lang.ClassCastException: java.util.ArrayList

You put the `Car` object in a `ArrayList` and use `putExtra` to send to the next activity. An `ArrayList` is not `Parcelable` but only `Serializable`. The `putExtra(ArrayList)` works as `putExtra(Serializable)`, but you read it by `getParcelable()`. An `ArrayList` cannot be cast to `Parcelable`.

Cannot pass custom Object in an Intent: The Method Put Extra is Ambiguous for the type Intent

Solution

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