android/content/DialogInterface.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.content;

import android.view.KeyEvent;

/**
 * Interface that defines a dialog-type class that can be shown, dismissed, or
 * canceled, and may have buttons that can be clicked.
 */
public interface DialogInterface {
    /** The identifier for the positive button. */
    int BUTTON_POSITIVE = -1;

    /** The identifier for the negative button. */
    int BUTTON_NEGATIVE = -2;

    /** The identifier for the neutral button. */
    int BUTTON_NEUTRAL = -3;

    /** @deprecated Use {@link #BUTTON_POSITIVE} */
    @Deprecated
    int BUTTON1 = BUTTON_POSITIVE;

    /** @deprecated Use {@link #BUTTON_NEGATIVE} */
    @Deprecated
    int BUTTON2 = BUTTON_NEGATIVE;

    /** @deprecated Use {@link #BUTTON_NEUTRAL} */
    @Deprecated
    int BUTTON3 = BUTTON_NEUTRAL;

    /**
     * Cancels the dialog, invoking the {@link OnCancelListener}.
     * <p>
     * The {@link OnDismissListener} may also be called if cancellation
     * dismisses the dialog.
     */
    void cancel();

    /**
     * Dismisses the dialog, invoking the {@link OnDismissListener}.
     */
    void dismiss();

    /**
     * Interface used to allow the creator of a dialog to run some code when the
     * dialog is canceled.
     * <p>
     * This will only be called when the dialog is canceled, if the creator
     * needs to know when it is dismissed in general, use
     * {@link DialogInterface.OnDismissListener}.
     */
    interface OnCancelListener {
        /**
         * This method will be invoked when the dialog is canceled.
         *
         * @param dialog the dialog that was canceled will be passed into the
         *               method
         */
        void onCancel(DialogInterface dialog);
    }

    /**
     * Interface used to allow the creator of a dialog to run some code when the
     * dialog is dismissed.
     */
    interface OnDismissListener {
        /**
         * This method will be invoked when the dialog is dismissed.
         *
         * @param dialog the dialog that was dismissed will be passed into the
         *               method
         */
        void onDismiss(DialogInterface dialog);
    }

    /**
     * Interface used to allow the creator of a dialog to run some code when the
     * dialog is shown.
     */
    interface OnShowListener {
        /**
         * This method will be invoked when the dialog is shown.
         *
         * @param dialog the dialog that was shown will be passed into the
         *               method
         */
        void onShow(DialogInterface dialog);
    }

    /**
     * Interface used to allow the creator of a dialog to run some code when an
     * item on the dialog is clicked.
     */
    interface OnClickListener {
        /**
         * This method will be invoked when a button in the dialog is clicked.
         *
         * @param dialog the dialog that received the click
         * @param which the button that was clicked (ex.
         *              {@link DialogInterface#BUTTON_POSITIVE}) or the position
         *              of the item clicked
         */
        void onClick(DialogInterface dialog, int which);
    }

    /**
     * Interface used to allow the creator of a dialog to run some code when an
     * item in a multi-choice dialog is clicked.
     */
    interface OnMultiChoiceClickListener {
        /**
         * This method will be invoked when an item in the dialog is clicked.
         *
         * @param dialog the dialog where the selection was made
         * @param which the position of the item in the list that was clicked
         * @param isChecked {@code true} if the click checked the item, else
         *                  {@code false}
         */
        void onClick(DialogInterface dialog, int which, boolean isChecked);
    }

    /**
     * Interface definition for a callback to be invoked when a key event is
     * dispatched to this dialog. The callback will be invoked before the key
     * event is given to the dialog.
     */
    interface OnKeyListener {
        /**
         * Called when a key is dispatched to a dialog. This allows listeners to
         * get a chance to respond before the dialog.
         *
         * @param dialog the dialog the key has been dispatched to
         * @param keyCode the code for the physical key that was pressed
         * @param event the KeyEvent object containing full information about
         *              the event
         * @return {@code true} if the listener has consumed the event,
         *         {@code false} otherwise
         */
        boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event);
    }
}