Pass value to activity started from intent in preferences?

Question

I have a number of Colors that can be set by the user in preferences. For that I have an Activity with a ColorPicker. The problem is don't know how to pass the key of the color being changed to the ColorPicker so it can save it in SharedPreferences.

        <Preference
            android:title="@string/pref_text_color"
            >
            <intent android:targetPackage="com.example.android.launcher"
                    android:targetClass="com.example.android.launcher.preferences.ColorPicker" />
            <!-- Pass value "textColor" -->
        </Preference>

How can this be done?

Answer 1

You can add data with the Intent to your ColorPicker activity in the following manner:

Intent intent = new Intent(this, ColorPickerActivity.class);
intent.putExtra("UNIQUE_KEY_FOR_THIS_COLOR_INFORMATION", colorIndex);

and retrieve it at your receiving side:

getIntent().getIntExtra("UNIQUE_KEY_FOR_THIS_COLOR_INFORMATION", -1);

where -1 is the default data if no value for that key is found.

Android has a pretty detailed documentation of Intents, which you should go through: http://developer.android.com/reference/android/content/Intent.html