Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2012 Andrew Neal 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.
 */

import android.content.Context;

import android.graphics.Rect;

import android.view.Gravity;
import android.view.View;

import android.widget.Toast;

public class Main {
    /**
     * Display a {@link Toast} letting the user know what an item does when long
     * pressed.
     * 
     * @param view The {@link View} to copy the content description from.
     */
    public static void showCheatSheet(final View view) {

        final int[] screenPos = new int[2]; // origin is device display
        final Rect displayFrame = new Rect(); // includes decorations (e.g.
                                              // status bar)
        view.getLocationOnScreen(screenPos);
        view.getWindowVisibleDisplayFrame(displayFrame);

        final Context context = view.getContext();
        final int viewWidth = view.getWidth();
        final int viewHeight = view.getHeight();
        final int viewCenterX = screenPos[0] + viewWidth / 2;
        final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
        final int estimatedToastHeight = (int) (48 * context.getResources().getDisplayMetrics().density);

        final Toast cheatSheet = Toast.makeText(context, view.getContentDescription(), Toast.LENGTH_SHORT);
        final boolean showBelow = screenPos[1] < estimatedToastHeight;
        if (showBelow) {
            // Show below
            // Offsets are after decorations (e.g. status bar) are factored in
            cheatSheet.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, viewCenterX - screenWidth / 2,
                    screenPos[1] - displayFrame.top + viewHeight);
        } else {
            // Show above
            // Offsets are after decorations (e.g. status bar) are factored in
            cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, viewCenterX - screenWidth / 2,
                    displayFrame.bottom - screenPos[1]);
        }
        cheatSheet.show();
    }
}