APP_Preferences_LaunchingPreferences

[LaunchingPreferences.java]

    private static final int REQUEST_CODE_PREFERENCES = 1;
    private TextView mCounterText;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

       PreferenceManager.setDefaultValues(this, R.xml.advanced_preferences, false);
       
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        setContentView(layout);
       
        Button launchPreferences = new Button(this);
        launchPreferences.setText(getString(R.string.launch_preference_activity));
        launchPreferences.setOnClickListener(this);
        layout.addView(launchPreferences, new LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.WRAP_CONTENT));
       
        mCounterText = new TextView(this);
        layout.addView(mCounterText, new LayoutParams(LayoutParams.FILL_PARENT,
                LayoutParams.WRAP_CONTENT));
       
        updateCounterText();
    }

    public void onClick(View v) {
       
        Intent launchPreferencesIntent = new Intent().setClass(this, AdvancedPreferences.class);
       
        startActivityForResult(launchPreferencesIntent, REQUEST_CODE_PREFERENCES);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
       
        if (requestCode == REQUEST_CODE_PREFERENCES) {
            updateCounterText();
        }
    }

    private void updateCounterText() {
        SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
        final int counter = sharedPref.getInt(AdvancedPreferences.KEY_MY_PREFERENCE, 0);
        mCounterText.setText(getString(R.string.counter_value_is) + " " + counter);
    }
}

[AdvancedPreferences.class]

   public static final String KEY_MY_PREFERENCE = "my_preference";
    public static final String KEY_ADVANCED_CHECKBOX_PREFERENCE = "advanced_checkbox_preference";

    private CheckBoxPreference mCheckBoxPreference;
    private Handler mHandler = new Handler();
   
    private Runnable mForceCheckBoxRunnable = new Runnable() {
        public void run() {
            if (mCheckBoxPreference != null) {
                mCheckBoxPreference.setChecked(!mCheckBoxPreference.isChecked());
            }
           
              mHandler.postDelayed(this, 1000);
        }
    };
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.advanced_preferences);
       
        mCheckBoxPreference = (CheckBoxPreference)getPreferenceScreen().findPreference(KEY_ADVANCED_CHECKBOX_PREFERENCE);
    }

    @Override
    protected void onResume() {
        super.onResume();

        mForceCheckBoxRunnable.run();
       
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();

        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
       
        mHandler.removeCallbacks(mForceCheckBoxRunnable);
    }

    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        if (key.equals(KEY_MY_PREFERENCE)) {
            Toast.makeText(this, "Thanks! You increased my count to "
                    + sharedPreferences.getInt(key, 0), Toast.LENGTH_SHORT).show();
        }
    }
   
}

[MyPreference.java]

   private int mClickCounter;

    public MyPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
       
        setWidgetLayoutResource(R.layout.preference_widget_mypreference);       
    }

    @Override
    protected void onBindView (View view) {
        super.onBindView(view);
       
        final TextView myTextView = (TextView) view.findViewById(R.id.mypreference_widget);
        if (myTextView != null) {
            myTextView.setText(String.valueOf(mClickCounter));
        }
    }

    @Override
    protected void onClick() {
        int newValue = mClickCounter + 1;
        if (!callChangeListener(newValue)) {
            return;
        }
       
        mClickCounter = newValue;
       
        persistInt(mClickCounter);
       
        notifyChanged();
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getInteger(index, 0);
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        if (restoreValue) {
            mClickCounter = getPersistedInt(mClickCounter);
        } else {
            int value = (Integer) defaultValue;
            mClickCounter = value;
            persistInt(value);
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
       
        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            return superState;
        }

        final SavedState myState = new SavedState(superState);
        myState.clickCounter = mClickCounter;
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!state.getClass().equals(SavedState.class)) {
            super.onRestoreInstanceState(state);
            return;
        }

        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        mClickCounter = myState.clickCounter;
        notifyChanged();
    }
   
    private static class SavedState extends BaseSavedState {
        int clickCounter;
       
        public SavedState(Parcel source) {
            super(source);
           
            clickCounter = source.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
           
            dest.writeInt(clickCounter);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
   
}

[advances_preferences.xml]

<PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android">

    <com.example.android.apis.app.MyPreference
            android:key="my_preference"
            android:title="@string/title_my_preference"
            android:summary="@string/summary_my_preference"
            android:defaultValue="100" />

    <CheckBoxPreference
            android:key="advanced_checkbox_preference"
            android:title="@string/title_advanced_toggle_preference"
            android:summaryOn="@string/summary_on_advanced_toggle_preference"
            android:summaryOff="@string/summary_off_advanced_toggle_preference" />

</PreferenceScreen>