/* * Copyright (C) 2008 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 com.example.android.apis.graphics;import android.app.Activity;import android.content.Context;import android.graphics.*;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.view.Window;public class UnicodeChart extends GraphicsActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                requestWindowFeature(Window.FEATURE_NO_TITLE);                setContentView(new SampleView(this));    }        private static class SampleView extends View {        private Paint mBigCharPaint;        private Paint mLabelPaint;        private final char[] mChars = new char[256];        private final float[] mPos = new float[512];                private int mBase;                private static final int XMUL = 20;        private static final int YMUL = 28;        private static final int YBASE = 18;        public SampleView(Context context) {            super(context);            setFocusable(true);            setFocusableInTouchMode(true);                        mBigCharPaint = new Paint(Paint.ANTI_ALIAS_FLAG);            mBigCharPaint.setTextSize(15);            mBigCharPaint.setTextAlign(Paint.Align.CENTER);                        mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);            mLabelPaint.setTextSize(8);            mLabelPaint.setTextAlign(Paint.Align.CENTER);                        // the position array is the same for all charts            float[] pos = mPos;            int index = 0;            for (int col = 0; col < 16; col++) {                final float x = col * 20 + 10;                for (int row = 0; row < 16; row++) {                    pos[index++] = x;                    pos[index++] = row * YMUL + YBASE;                }            }        }                private float computeX(int index) {            return (index >> 4) * 20 + 10;        }        private float computeY(int index) {            return (index & 0xF) * YMUL + YMUL;        }                private void drawChart(Canvas canvas, int base) {            char[] chars = mChars;            for (int i = 0; i < 256; i++) {                int unichar = base + i;                chars[i] = (char)unichar;                                canvas.drawText(Integer.toHexString(unichar),                                computeX(i), computeY(i), mLabelPaint);            }            canvas.drawPosText(chars, 0, 256, mPos, mBigCharPaint);        }                @Override protected void onDraw(Canvas canvas) {            canvas.drawColor(Color.WHITE);                        canvas.translate(0, 1);            drawChart(canvas, mBase * 256);        }        @Override public boolean onKeyDown(int keyCode, KeyEvent event) {            switch (keyCode) {                case KeyEvent.KEYCODE_DPAD_LEFT:                    if (mBase > 0) {                        mBase -= 1;                        invalidate();                    }                    return true;                case KeyEvent.KEYCODE_DPAD_RIGHT:                    mBase += 1;                    invalidate();                    return true;                default:                    break;            }            return super.onKeyDown(keyCode, event);        }    }}