Merge "AM: clean up screen pinning toasts."

package com.android.server.am;

import android.content.Context;

import android.os.Handler;

import android.os.Message;

import android.os.SystemClock;

import android.util.Slog;

import android.view.WindowManager;

import com.android.internal.R;

/**

 *  Helper to manage showing/hiding a image to notify them that they are entering

 *  or exiting screen pinning mode.

 *  Helper to manage showing/hiding a image to notify them that they are entering or exiting screen

 *  pinning mode. All exposed methods should be called from a handler thread.

 */

public class LockTaskNotify {

    private static final String TAG = "LockTaskNotify";

    private static final long SHOW_TOAST_MINIMUM_INTERVAL = 1000;

    private final Context mContext;

    private final H mHandler;

    private Toast mLastToast;

    private long mLastShowToastTime;

    public LockTaskNotify(Context context) {

        mContext = context;

        mHandler = new H();

    }

    /** Show "Screen pinned" toast. */

    /** Show a toast that describes the gesture the user should use to escape pinned mode. */

    void showEscapeToast() {

        mHandler.obtainMessage(H.SHOW_ESCAPE_TOAST).sendToTarget();

    }

    private void handleShowEscapeToast() {

        long showToastTime = SystemClock.elapsedRealtime();

        if ((showToastTime - mLastShowToastTime) < SHOW_TOAST_MINIMUM_INTERVAL) {

            Slog.i(TAG, "Ignore toast since it is requested in very short interval.");

        toast.show();

        return toast;

    }

    private final class H extends Handler {

        private static final int SHOW_ESCAPE_TOAST = 3;

        @Override

        public void handleMessage(Message msg) {

            switch(msg.what) {

                case SHOW_ESCAPE_TOAST:

                    handleShowEscapeToast();

                    break;

            }

        }

    }

}